def get_filtered_CSF_img(img_in):
img_dft = cv2.dft(np.float32(img_in), flags=cv2.DFT_COMPLEX_OUTPUT)
dft_shift = np.fft.fftshift(img_dft)
height = img_dft.shape[0]
weight = img_dft.shape[1]
M = weight / 2
N = height / 2
H_matrix = np.zeros((height, weight))
for h_idx in range(height):
for w_idx in range(weight):
m = -M + w_idx + 0.5
n = -N + h_idx + 0.5
freq, theta = get_freq_dirc(m, n, weight, height)
multiVal = freq_trans_func(freq, theta)
H_matrix[h_idx][w_idx] = multiVal
img_magi = cv2.magnitude(img_dft[:, :, 0], img_dft[:, :, 1])
img_magi *= H_matrix
img_phase = cv2.phase(img_dft[:, :, 0], img_dft[:, :, 1])
img_re = img_magi * np.cos(img_phase)
img_im = img_magi * (np.sin(img_phase))
img_dft2 = np.dstack((img_re, img_im))
imgback = cv2.idft(img_dft2)
imgback = cv2.magnitude(imgback[:, :, 0], imgback[:, :, 1])
return imgback
def __init__(self, frame, rect, number):
self.num = number
x1, y1, x2, y2 = rect
w, h = map(cv2.getOptimalDFTSize, [x2-x1, y2-y1])
x1, y1 = (x1+x2-w)//2, (y1+y2-h)//2
self.pos = x, y = x1+0.5*(w-1), y1+0.5*(h-1)
self.size = w, h
img = cv2.getRectSubPix(frame, (w, h), (x, y))
self.win = cv2.createHanningWindow((w, h), cv2.CV_32F)
g = np.zeros((h, w), np.float32)
g[h//2, w//2] = 1
g = cv2.GaussianBlur(g, (-1, -1), 2.0)
g /= g.max()
self.G = cv2.dft(g, flags=cv2.DFT_COMPLEX_OUTPUT)
self.H1 = np.zeros_like(self.G)
self.H2 = np.zeros_like(self.G)
for i in xrange(128):
a = self.preprocess(MOSSE.rnd_warp(img))
A = cv2.dft(a, flags=cv2.DFT_COMPLEX_OUTPUT)
self.H1 += cv2.mulSpectrums(self.G, A, 0, conjB=True)
self.H2 += cv2.mulSpectrums( A, A, 0, conjB=True)
self.update_kernel()
self.update(frame)
def cv2_convolution(image, b):
dft_m = cv2.getOptimalDFTSize(image.shape[0] + b.shape[0] - 1)
dft_n = cv2.getOptimalDFTSize(image.shape[1] + b.shape[1] - 1)
d = b.shape[0]
c = np.zeros((image.shape[0] + d - 1, image.shape[1] + d - 1), dtype='uint8')
# getting gaussian dft
dft_b = np.zeros((dft_m, dft_n), dtype='float64')
dft_b[:b.shape[0], :b.shape[1]] = b
dft_b = cv2.dft(dft_b, flags=cv2.DFT_REAL_OUTPUT)
# getting layers dft
dfts = []
new_channels = []
channels = cv2.split(image)
for i, channel in enumerate(channels):
#cv2.imshow('channel %d'%i, channel)
a = np.array(channel, dtype='float64')
dft_a = np.zeros((dft_m, dft_n), dtype='float64')
dft_a[:a.shape[0], :a.shape[1]] = a
dft_a = cv2.dft(dft_a, flags=cv2.DFT_REAL_OUTPUT)
dft_a = cv2.mulSpectrums(dft_a, dft_b, 0)
dft_a = cv2.idft(dft_a, flags= cv2.DFT_SCALE | cv2.DFT_REAL_OUTPUT)
tmp = dft_a[d/2:a.shape[0] + d/2, d/2:a.shape[1] + d/2]
channel = np.array(tmp, dtype='uint8')
#cv2.imshow('new channel %d'%i, channel)
new_channels.append(channel)
result = cv2.merge(new_channels)
return result
def focousing_degree_map(src,n=8):
try:
src = cv2.cvtColor(src,cv2.COLOR_BGR2GRAY)
src = src.astype(float)
focousing_degrees = np.zeros((len(src),len(src[0])))
x,y,var,sumF = 0,0,0,0
while x+n <= len(src[0]):
while y+n <= len(src):
block = src[y:y+n,x:x+n]
cv2.dft(block)
for j in range(n):
for i in range(n):
F = abs(block[j,i])
sumF += F
W = np.exp(-((n-j)*(n-j)+(n-i)*(n-i))/(0.25*n*n))
var += F*W
f = var/(sumF)
for v in range(n):
for u in range(n):
focousing_degrees[y+v,x+u] = f
f,var,sumF = 0,0,0
y+=n
x+=n
y=0
out_dict = {"name": "focousing_degree_map", "value" : focousing_degrees}
except:
out_dict = {}
raise
return out_dict
def __init__(self, frame, rect):
x1, y1, x2, y2 = rect
self.using_lk = False
self.frameWidth = frame.shape[1]
self.frameHeight = frame.shape[0]
w, h = map(cv2.getOptimalDFTSize, [x2-x1, y2-y1])
x1, y1 = (x1+x2-w)//2, (y1+y2-h)//2
self.pos = x, y = x1+0.5*(w-1), y1+0.5*(h-1)
self.size = w, h
self.org_size = w,h
img = cv2.getRectSubPix(frame, (w, h), (x, y))
#self.win = cv2.createHanningWindow((w, h), cv2.CV_32F)
g = np.zeros((h, w), np.float32)
g[h//2, w//2] = 1
g = cv2.GaussianBlur(g, (-1, -1), 2.0)
g /= g.max()
self.G = cv2.dft(g, flags=cv2.DFT_COMPLEX_OUTPUT)
#print "init G",self.G.shape
self.H1 = np.zeros_like(self.G)
self.H2 = np.zeros_like(self.G)
for i in xrange(128):
a = self.preprocess(rnd_warp(img),self.size)
A = cv2.dft(a, flags=cv2.DFT_COMPLEX_OUTPUT)
self.H1 += cv2.mulSpectrums(self.G, A, 0, conjB=True)
self.H2 += cv2.mulSpectrums( A, A, 0, conjB=True)
#print "init imgF:",A.shape
#print "init H1",self.H1.shape
#print "init H2",self.H2.shape
self.update_kernel()
def __init__(self, frame, rect):
x1, y1, x2, y2 = rect # Extract coordinates of the rectangle to be tracked
w, h = map(cv2.getOptimalDFTSize, [x2 - x1, y2 - y1])
x1, y1 = (x1 + x2 - w) // 2, (y1 + y2 - h) // 2
# 0.5 * x \in [w, h] (-1) = the centre point of the region
self.pos = x, y = x1 + 0.5 * (w - 1), y1 + 0.5 * (h - 1)
self.size = w, h
img = cv2.getRectSubPix(frame, (w, h), (x, y))
# Hanning Window
# http://en.wikipedia.org/wiki/Window_function
# http://en.wikipedia.org/wiki/Window_function#Hann_.28Hanning.29_window
self.win = cv2.createHanningWindow((w, h), cv2.CV_32F)
g = np.zeros((h, w), np.float32)
g[h // 2, w // 2] = 1
g = cv2.GaussianBlur(g, (-1, -1), 2.0)
g /= g.max()
self.G = cv2.dft(g, None, cv2.DFT_COMPLEX_OUTPUT)
self.H1 = np.zeros_like(self.G)
self.H2 = np.zeros_like(self.G)
for i in xrange(128):
a = self.preprocess(rnd_warp(img))
A = cv2.dft(a, None, cv2.DFT_COMPLEX_OUTPUT)
self.H1 += cv2.mulSpectrums(self.G, A, 0, conjB=True)
self.H2 += cv2.mulSpectrums(A, A, 0, conjB=True)
self.update_kernel()
self.update(frame)
self.id = id(self)
def apply_channel_deconvolution (self, img, psfsize=10, snrVal=8): # Based on deconvolution.py in python samples of opencv
img = img.astype('double')/255.0
img = self.blur_edge(img)
IMG = cv2.dft(img, flags=cv2.DFT_COMPLEX_OUTPUT)
if (psfsize==0): return img
defocus = True
ang = 0
d = psfsize
snr = snrVal
noise = 10**(-0.1*snr)
if defocus:
psf = self.defocus_kernel(d)
else:
psf = self.motion_kernel(ang, d)
psf /= psf.sum()
psf_pad = np.zeros_like(img)
kh, kw = psf.shape
psf_pad[:kh, :kw] = psf
PSF = cv2.dft(psf_pad, flags=cv2.DFT_COMPLEX_OUTPUT, nonzeroRows = kh)
PSF2 = (PSF**2).sum(-1)
iPSF = PSF / (PSF2 + noise)[...,np.newaxis]
RES = cv2.mulSpectrums(IMG, iPSF, 0)
res = cv2.idft(RES, flags=cv2.DFT_SCALE | cv2.DFT_REAL_OUTPUT )
res = np.roll(res, -kh//2, 0)
res = np.roll(res, -kw//2, 1)
return res
def cv2_deconvolution(image, b):
dft_m = cv2.getOptimalDFTSize(image.shape[0] + b.shape[0] - 1)
dft_n = cv2.getOptimalDFTSize(image.shape[1] + b.shape[1] - 1)
c = np.zeros((image.shape[0] + d - 1, image.shape[1] + d - 1), dtype='uint8')
# getting gaussian dft
dft_b = np.zeros((dft_m, dft_n), dtype='float64')
dft_b[:b.shape[0], :b.shape[1]] = b
psf = cv2.dft(dft_b, flags=cv2.DFT_COMPLEX_OUTPUT)
psf2 = (psf**2).sum(-1)
ipsf = psf / (psf2 + 0.7)[..., np.newaxis]
# getting layers dft
dfts = []
new_channels = []
channels = cv2.split(image)
for i, channel in enumerate(channels):
#cv2.imshow('channel %d'%i, channel)
a = np.array(channel, dtype='float64')
dft_a = np.zeros((dft_m, dft_n), dtype='float64')
dft_a[:a.shape[0], :a.shape[1]] = a
print 'deconv'
dft_a = cv2.dft(dft_a, flags=cv2.DFT_COMPLEX_OUTPUT)
dft_a = cv2.mulSpectrums(dft_a, ipsf, 0)
print dft_a
dft_a = cv2.idft(dft_a, flags=cv2.DFT_SCALE | cv2.DFT_REAL_OUTPUT)
print dft_a
tmp = dft_a[d/2:a.shape[0] + d/2, d/2:a.shape[1] + d/2]
channel = np.array(tmp, dtype='uint8')
cv2.imshow('new channel %d'%i, channel)
new_channels.append(channel)
result = cv2.merge(new_channels)
return result
def __init__(self, frame, rect):
x1, y1, x2, y2 = rect
self.using_lk = False
self.Impused = False
self.tx = 0
self.ty = 0
self.frameWidth = frame.shape[1]
self.frameHeight = frame.shape[0]
self.firstframe = frame[int(y1):int(y2),int(x1):int(x2)]
cv2.imshow('first frame',self.firstframe)
fout.write(str(x1)+','+ str(y1)+','+ str(x2)+','+ str(y2)+'\n')
org_fout.write(str(x1)+','+ str(y1)+','+ str(x2)+','+ str(y2)+'\n')
w, h = map(cv2.getOptimalDFTSize, [x2-x1, y2-y1])
x1, y1 = (x1+x2-w)//2, (y1+y2-h)//2
self.pos = x, y = x1+0.5*(w-1), y1+0.5*(h-1)
self.size = w, h
self.org_size = w,h
img = cv2.getRectSubPix(frame, (w, h), (x, y))
self.PF_number = n_PF
self.prev_PF_count = n_PF
self.f0 = np.array([])
self.f = np.array([])
self.pt = np.ones((n_PF, 2), int) * self.pos
self.last_img_PF = np.array([])
self.last_resp_PF = np.array([])
#self.win = cv2.createHanningWindow((w, h), cv2.CV_32F)
g = np.zeros((h, w), np.float32)
g[h//2, w//2] = 1
g = cv2.GaussianBlur(g, (-1, -1), 2.0)
g /= g.max()
self.G = cv2.dft(g, flags=cv2.DFT_COMPLEX_OUTPUT)
#print "init G",self.G.shape
self.H1 = np.zeros_like(self.G)
self.H2 = np.zeros_like(self.G)
for i in xrange(128):
a = self.preprocess(rnd_warp(img),self.size)
A = cv2.dft(a, flags=cv2.DFT_COMPLEX_OUTPUT)
self.H1 += cv2.mulSpectrums(self.G, A, 0, conjB=True)
self.H2 += cv2.mulSpectrums( A, A, 0, conjB=True)
#print "init imgF:",A.shape
#print "init H1",self.H1.shape
#print "init H2",self.H2.shape
self.update_kernel()
def get_shift(self, imgA, imgB):
rv = np.array([0.0, 0.0])
if (imgA is not None) and (imgB is not None) and (imgA.shape==imgB.shape):
# Phase correlation.
A = cv2.dft(imgA)
B = cv2.dft(imgB)
AB = cv2.mulSpectrums(A, B, flags=0, conjB=True)
normAB = cv2.norm(AB)
if (normAB != 0.0):
crosspower = AB / normAB
shift = cv2.idft(crosspower)
shift0 = np.roll(shift, int(shift.shape[0]/2), 0)
shift00 = np.roll(shift0, int(shift.shape[1]/2), 1) # Roll the matrix so 0,0 goes to the center of the image.
# Get the coordinates of the maximum shift.
kShift = np.argmax(shift00)
(iShift,jShift) = np.unravel_index(kShift, shift00.shape)
# Get weighted centroid of a region around the peak, for sub-pixel accuracy.
w = 7
r = int((w-1)/2)
i0 = clip(iShift-r, 0, shift00.shape[0]-1)
i1 = clip(iShift+r, 0, shift00.shape[0]-1)+1
j0 = clip(jShift-r, 0, shift00.shape[1]-1)
j1 = clip(jShift+r, 0, shift00.shape[1]-1)+1
peak = shift00[i0:i1].T[j0:j1].T
moments = cv2.moments(peak, binaryImage=False)
if (moments['m00'] != 0.0):
iShiftSubpixel = moments['m01']/moments['m00'] + float(i0)
jShiftSubpixel = moments['m10']/moments['m00'] + float(j0)
else:
iShiftSubpixel = float(shift.shape[0])/2.0
jShiftSubpixel = float(shift.shape[1])/2.0
# Accomodate the matrix roll we did above.
iShiftSubpixel -= float(shift.shape[0])/2.0
jShiftSubpixel -= float(shift.shape[1])/2.0
# Convert unsigned shifts to signed shifts.
height = float(shift00.shape[0])
width = float(shift00.shape[1])
iShiftSubpixel = ((iShiftSubpixel+height/2.0) % height) - height/2.0
jShiftSubpixel = ((jShiftSubpixel+width/2.0) % width) - width/2.0
rv = np.array([iShiftSubpixel, jShiftSubpixel])
return rv
def saliency_feature(img):
img_orig = img
img = cv2.resize(img, (64, 64))
img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
# h = cv2.getOptimalDFTSize(img.shape[0])
# w = cv2.getOptimalDFTSize(img.shape[1])
# print "Resizing (%d, %d) to (%d, %d)" % (img.shape[0], img.shape[1], h, w)
# h = (h - img.shape[0])/2.0
# w = (w - img.shape[1])/2.0
# img = cv2.copyMakeBorder(img, int(math.floor(h)), int(math.ceil(h)), int(math.floor(w)), int(math.ceil(w)), cv2.BORDER_CONSTANT, value=0)
dft = cv2.dft(np.float32(img), flags=cv2.DFT_COMPLEX_OUTPUT)
A, P = cv2.cartToPolar(dft[:,:,0], dft[:,:,1])
L = cv2.log(A)
h_n = (1./3**2)*np.ones((3,3))
R = L - cv2.filter2D(L, -1, h_n)
S = cv2.GaussianBlur(cv2.idft(np.dstack(cv2.polarToCart(cv2.exp(R), P)), flags=cv2.DFT_REAL_OUTPUT)**2, (0,0), 8)
S = cv2.resize(cv2.normalize(S, None, 0, 1, cv2.NORM_MINMAX), (img_orig.shape[1],img_orig.shape[0]))
# cv2.namedWindow('tmp1', cv2.WINDOW_NORMAL)
# cv2.imshow('tmp1', img_orig)
# cv2.namedWindow('tmp', cv2.WINDOW_NORMAL)
# cv2.imshow('tmp', S)
# cv2.waitKey()
return S
def fft(img,x,y,w,h):
rows, cols = img.shape
crow,ccol = rows/2 , cols/2
dft = cv2.dft(np.float32(img),flags = cv2.DFT_COMPLEX_OUTPUT)
dft_shift = np.fft.fftshift(dft)
magnitude_spectrum = 20*np.log(cv2.magnitude(dft_shift[:,:,0],dft_shift[:,:,1]))
mask = np.zeros((rows,cols,2),np.uint8)
mask[crow-x:crow+w, ccol-y:ccol+h] = 1
mag_mask = copy.copy(magnitude_spectrum)
mag_mask[crow-x:crow+w, ccol-y:ccol+h] = 0
fshift = dft_shift*mask
f_ishift = np.fft.ifftshift(fshift)
img_back = cv2.idft(f_ishift)
img_back = cv2.magnitude(img_back[:,:,0],img_back[:,:,1])
plt.subplot(121),plt.imshow(img, cmap = 'gray')
plt.title('Input Image'), plt.xticks([]), plt.yticks([])
plt.subplot(122),plt.imshow(magnitude_spectrum, cmap = 'gray')
plt.title('Magnitude Spectrum'), plt.xticks([]), plt.yticks([])
plt.show()
plt.subplot(121),plt.imshow(img_back, cmap = 'gray')
plt.title('Output Image'), plt.xticks([]), plt.yticks([])
plt.subplot(122),plt.imshow(mag_mask, cmap = 'gray')
plt.title('Cut Magnitude Spectrum'), plt.xticks([]), plt.yticks([])
plt.show()
def measure_blurriness_DFT(img):
""" More complex blurriness measure averaging top 90% of frequencies in image
"""
img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
blur_img = cv2.GaussianBlur(img, (3, 3), 0)
dftHeight = cv2.getOptimalDFTSize(blur_img.shape[0])
dftWidth = cv2.getOptimalDFTSize(blur_img.shape[1])
complexImg = np.zeros([dftHeight, dftWidth, 2], dtype=float)
complexImg[0:img.shape[0], 0:img.shape[1], 0] = img / 255.0
dft_img = cv2.dft(complexImg)
dft_img = cv2.magnitude(dft_img[:, :, 0], dft_img[:, :, 1])
dft_img = cv2.log(dft_img + 1)
cv2.normalize(dft_img, dft_img, 0, 1, cv2.NORM_MINMAX)
dft_img_h, dft_img_w = dft_img.shape[:2]
win_size = dft_img_w * 0.55
window = dft_img[dft_img_h / 2 - win_size:dft_img_h / 2 + win_size,
dft_img_w / 2 - win_size:dft_img_w / 2 + win_size]
return np.mean(np.abs(window))
def PlotPowerSpectrum(self):
# convert the frame to grayscale if necessary
if len(self.frameOrig.shape)>2:
frame = cv3.cvtColor(self.frameOrig, cv3.COLOR_BGR2GRAY)
else:
frame = self.frameOrig
# expand the image to an optimal size for FFT
rows,cols = self.frameOrig.shape[:2]
nrows = cv3.getOptimalDFTSize(rows)
ncols = cv3.getOptimalDFTSize(cols)
frame = cv3.copyMakeBorder(frame, 0, ncols-cols, 0, nrows-rows,
cv3.BORDER_CONSTANT, value = 0)
# do FFT and get log-spectrum
if self.useNumpyFFT:
imgDFT = np.fft.fft2(frame)
spectrum = np.log10(np.real(np.abs(imgDFT))**2)
else:
imgDFT = cv3.dft(np.float32(frame), flags=cv3.DFT_COMPLEX_OUTPUT)
spectrum = np.log10(imgDFT[:,:,0]**2+imgDFT[:,:,1]**2)
# radial average
L = max(frame.shape)
freqs = np.fft.fftfreq(L)[:L/2]
dists = np.sqrt(np.fft.fftfreq(frame.shape[0])[:,None]**2
+ np.fft.fftfreq(frame.shape[1])**2)
dcount = np.histogram(dists.ravel(), bins=freqs)[0]
histo,bins = np.histogram(dists.ravel(), bins=freqs, weights=spectrum.ravel())
centers = (bins[:-1] + bins[1:]) / 2
plt.plot(centers, histo/dcount)
plt.xlabel('frequency')
plt.ylabel('log-spectrum')
plt.show()
def test_dft(self):
img = self.get_sample('samples/data/rubberwhale1.png', 0)
eps = 0.001
#test direct transform
refDft = np.fft.fft2(img)
refDftShift = np.fft.fftshift(refDft)
refMagnitide = np.log(1.0 + np.abs(refDftShift))
testDft = cv2.dft(np.float32(img),flags = cv2.DFT_COMPLEX_OUTPUT)
testDftShift = np.fft.fftshift(testDft)
testMagnitude = np.log(1.0 + cv2.magnitude(testDftShift[:,:,0], testDftShift[:,:,1]))
refMagnitide = cv2.normalize(refMagnitide, 0.0, 1.0, cv2.NORM_MINMAX)
testMagnitude = cv2.normalize(testMagnitude, 0.0, 1.0, cv2.NORM_MINMAX)
self.assertLess(cv2.norm(refMagnitide - testMagnitude), eps)
#test inverse transform
img_back = np.fft.ifft2(refDft)
img_back = np.abs(img_back)
img_backTest = cv2.idft(testDft)
img_backTest = cv2.magnitude(img_backTest[:,:,0], img_backTest[:,:,1])
img_backTest = cv2.normalize(img_backTest, 0.0, 1.0, cv2.NORM_MINMAX)
img_back = cv2.normalize(img_back, 0.0, 1.0, cv2.NORM_MINMAX)
self.assertLess(cv2.norm(img_back - img_backTest), eps)
def calculateFft(img):
imgTmp = np.float32(img)
# FFT of the image
imgFft = cv2.dft(imgTmp,flags = cv2.DFT_COMPLEX_OUTPUT)
# the FFT shift is needed in order to center the results
imgFftShifted = np.fft.fftshift(imgFft)
return (imgFft, imgFftShifted)
def __init__(self, size):
# Get frame size
x1, y1 = 0, 0
x2, y2 = size
# Resize to fft window
w, h = map(cv2.getOptimalDFTSize, [x2-x1, y2-y1])
x1, y1 = (x1+x2-w)//2, (y1+y2-h)//2
# Store position and size relative to frame
self.pos = x, y = x1+0.5*(w-1), y1+0.5*(h-1)
self.size = w, h
# Create Hanning window (weighting of values from center)
self.win = cv2.createHanningWindow((w, h), cv2.CV_32F)
# Create output image (centered Gaussian point--for correlation)
g = np.zeros((h, w), np.float32)
g[h//2, w//2] = 1
g = cv2.GaussianBlur(g, (-1, -1), 2.0)
g /= g.max()
# Save the desired output image in frequency space
self.G = cv2.dft(g, flags=cv2.DFT_COMPLEX_OUTPUT)
# Create sum matrices
self.F = np.zeros_like(self.G)
self.HSum = np.zeros_like(self.G)
self.count = 0
def doDFT():
# read as gray image.
img = cv2.imread('1.jpg', 0)
# cv2.imwrite('gray.jpg', img)
# t1 = dct(dct(img.T, norm='ortho').T, norm='ortho')
dft = cv2.dft(np.float32(img),flags = cv2.DFT_COMPLEX_OUTPUT)
dft_shift = np.fft.fftshift(dft)
magnitude_spectrum = 20*np.log(cv2.magnitude(dft_shift[:,:,0],dft_shift[:,:,1]))
rows, cols = img.shape
crow,ccol = rows/2 , cols/2
# create a mask first, center square is 1, remaining all zeros
mask = np.zeros((rows,cols,2),np.uint8)
mask[crow-5:crow+5, ccol-5:ccol+5] = 1
# apply mask and inverse DFT
fshift = dft_shift*mask
print fshift[:, :, 0]
print fshift[:, :, 0].shape
f_ishift = np.fft.ifftshift(fshift)
img_back = cv2.idft(f_ishift)
img_back = cv2.magnitude(img_back[:,:,0],img_back[:,:,1])
plt.subplot(121),plt.imshow(img, cmap = 'gray')
plt.title('Input Image'), plt.xticks([]), plt.yticks([])
plt.subplot(122),plt.imshow(img_back, cmap = 'gray')
plt.title('Magnitude Spectrum'), plt.xticks([]), plt.yticks([])
plt.show()
return
def update(self, frame, pos=None, rate=0.125):
# Crop template image from last position
(x, y), (w, h) = self.pos if pos is None else pos, self.size
self.last_img = img = cv2.getRectSubPix(frame, (w, h), (x, y))
img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
img = self.preprocess(img)
# Correlate, find position of object
self.last_resp, (dx, dy), self.psr = self.correlate(img)
# Break if lost tracking (don't update filter)
self.good = self.psr > 8.0
if not self.good:
return
# Cut out new image based on tracked location
self.pos = x+dx, y+dy
self.last_img = img = cv2.getRectSubPix(frame, (w, h), self.pos)
img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
# Preprocess, get DFT
img = self.preprocess(img)
A = cv2.dft(img, flags=cv2.DFT_COMPLEX_OUTPUT)
H1 = cv2.mulSpectrums(self.G, A, 0, conjB=True) # G x F*
H2 = cv2.mulSpectrums( A, A, 0, conjB=True) # F x F*
# Get weighted average based on the rate (using the new image)
self.H1 = self.H1 * (1.0-rate) + H1 * rate
self.H2 = self.H2 * (1.0-rate) + H2 * rate
# Update filter
self.update_kernel()
def main():
parser = argparse.ArgumentParser(
description='Enhance fingerprint image with diferent parameters.')
parser.add_argument(
"image_path", help="Specify image path location")
args = parser.parse_args()
pre_processor = preprocessing.PreProcessFingerImage(args.image_path)
pre_processor.process_image()
image_pre = pre_processor.get_preprocessed_image()
#gaussian_3 = cv2.GaussianBlur(image, (9,9), 10.0)
#unsharp_image = cv2.addWeighted(image, 1.5, gaussian_3, -0.5, 0, image)
dft = cv2.dft(np.float32(image_pre), flags=cv2.DFT_COMPLEX_OUTPUT)
dft_shift = np.fft.fftshift(dft)
dft_filtered = preprocessing.frequency_filters.blpf(dft_shift, 70, 20)
f_ishift = np.fft.ifftshift(dft_filtered)
image_pre = cv2.idft(
f_ishift, flags=cv2.DFT_SCALE | cv2.DFT_REAL_OUTPUT)
for k in np.linspace(0, 2, 5):
for window in [20, 25, 35, 40, image_pre.shape[0]]:
image_fft = enhance_image(image_pre, window, 2, k)
cv2.imshow('FF Enhanced Image with k=' + str(k) +
' window=' + str(window), image_fft)
cv2.waitKey()
cv2.destroyAllWindows()
def update(self, frame, rate=0.125, img_override=None):
(x, y), (w, h) = self.pos, self.size
if img_override is None:
self.last_img = img = cv2.getRectSubPix(frame, (w, h), (x, y))
else:
self.last_img = img = img_override
img = self.preprocess(img)
self.last_resp, (dx, dy), self.psr = self.correlate(img)
self.good = self.psr > self.MIN_PSR
if not self.good:
return
self.pos = x + dx, y + dy
self.last_img = img = cv2.getRectSubPix(frame, (w, h), self.pos)
img = self.preprocess(img)
A = cv2.dft(img, flags=cv2.DFT_COMPLEX_OUTPUT)
H1 = cv2.mulSpectrums(self.G, A, 0, conjB=True)
H2 = cv2.mulSpectrums(A, A, 0, conjB=True)
self.H1 = self.H1 * (1.0 - rate) + H1 * rate
self.H2 = self.H2 * (1.0 - rate) + H2 * rate
self.update_kernel()
def apply_filter(img, ftype, flen, ksize=-1, ori=0):
"""
Apply a particular deblur filter.
:param str ftype:
Filter type.
:param int ksize:
Kernel size.
:param int flen:
Filter length (must be strictly smaller than the kernel size).
:param int ori:
Optional kernel orientation. Unused for circular kernels.
"""
if ksize < 0:
ksize = flen
assert ksize >= flen, "kernel size must not be less than filter length"
img = np.array(img, dtype=np.float32)
# frequency domain representation of the image
img = blur_edge(img, flen)
img_gray = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY)
IMG = cv2.dft(img_gray, flags=cv2.DFT_COMPLEX_OUTPUT)
print(IMG)
# make the PSF for deblurring
if ftype == "linear":
psf = makeLinearKernel(ksize=ksize, flen=flen, angle=ori)
else:
psf = makeCircularKernel(ksize=ksize, flen=flen)
# perform the deconvolution
psf_pad = np.zeros_like(img_gray)
kh, kw = psf.shape
psf_pad[:kh, :kw] = psf
PSF = cv2.dft(psf_pad, flags=cv2.DFT_COMPLEX_OUTPUT, nonzeroRows=kh)
PSF2 = (PSF**2).sum(-1)
iPSF = PSF / (PSF2 + 10**5)[...,np.newaxis]
RES = cv2.mulSpectrums(IMG, iPSF, 0)
res = cv2.idft(RES, flags=cv2.DFT_SCALE | cv2.DFT_REAL_OUTPUT)
res = np.roll(res, -kh//2, 0)
res = np.roll(res, -kw//2, 1)
def apply_sample(self, sample):
# Preprocess, get DFT
img = self.preprocess(sample)
A = cv2.dft(img, flags=cv2.DFT_COMPLEX_OUTPUT)
# Add to sum matrices
self.H1 += cv2.mulSpectrums(self.G, A, 0, conjB=True) # Sum of G x F*
self.H2 += cv2.mulSpectrums( A, A, 0, conjB=True) # Sum of F x F*
def apply_sample(self, sample):
# Preprocess, get DFT
img = self.preprocess(sample)
self.F = cv2.dft(img, flags=cv2.DFT_COMPLEX_OUTPUT)
self.count += 1
# Update filter
self.update_kernel()
def correlate(self, img):
C = cv2.mulSpectrums(cv2.dft(img, flags=cv2.DFT_COMPLEX_OUTPUT), self.H, 0, conjB=True)
resp = cv2.idft(C, flags=cv2.DFT_SCALE | cv2.DFT_REAL_OUTPUT)
h, w = resp.shape
_, mval, _, (mx, my) = cv2.minMaxLoc(resp)
side_resp = resp.copy()
cv2.rectangle(side_resp, (mx-5, my-5), (mx+5, my+5), 0, -1)
smean, sstd = side_resp.mean(), side_resp.std()
psr = (mval-smean) / (sstd+eps)
return resp, (mx-w//2, my-h//2), psr
def run(in_file, out_file):
img = cv2.imread(in_file)
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
rows, cols = gray.shape
dft = cv2.dft(np.float32(gray),flags = cv2.DFT_COMPLEX_OUTPUT)
dft_shift = np.fft.fftshift(dft)
magnitude_spectrum = 20*np.log(cv2.magnitude(dft_shift[:,:,0],dft_shift[:,:,1]))
(_, thresh) = cv2.threshold(magnitude_spectrum, 230, 255, cv2.THRESH_BINARY)
thresh = np.uint8(thresh)
lines = cv2.HoughLines(thresh,1,np.pi/180,30)
magnitude_spectrum_lines = np.copy(magnitude_spectrum)
for rho,theta in lines[0]:
a = np.cos(theta)
b = np.sin(theta)
x0 = a*rho
y0 = b*rho
x1 = int(x0 + 1000*(-b))
y1 = int(y0 + 1000*(a))
x2 = int(x0 - 1000*(-b))
y2 = int(y0 - 1000*(a))
m_numerator = y2 - y1
m_denominator = x2 - x1
angle = np.rad2deg(math.atan2(m_numerator, m_denominator))
M = cv2.getRotationMatrix2D((cols/2, rows/2), angle, 1)
if cols > rows:
out_dims = (cols, cols)
else:
out_dims = (rows, rows)
rotated_img = cv2.warpAffine(img, M, out_dims)
cv2.line(magnitude_spectrum_lines,(x1,y1),(x2,y2),(0,0,255),2)
b,g,r = cv2.split(rotated_img)
rotated_img = cv2.merge([r,g,b])
rotated_img = Image.fromarray(rotated_img)
rotated_img.save(out_file)
magnitude_spectrum = Image.fromarray(magnitude_spectrum).convert('RGB')
magnitude_spectrum.save('results/fourier.png')
magnitude_spectrum_lines = Image.fromarray(magnitude_spectrum_lines).convert('RGB')
magnitude_spectrum_lines.save('results/fourier_lines.png')
"""
def __init__(self, frame, rect):
# Get frame size
x1, y1, x2, y2 = rect
# Resize to fft window
w, h = map(cv2.getOptimalDFTSize, [x2-x1, y2-y1])
x1, y1 = (x1+x2-w)//2, (y1+y2-h)//2
# Store position and size relative to frame
self.pos = x, y = x1+0.5*(w-1), y1+0.5*(h-1)
self.size = w, h
# Crop template image from frame
img = cv2.getRectSubPix(frame, (w, h), (x, y))
img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
# Create Hanning window (weighting of values from center)
self.win = cv2.createHanningWindow((w, h), cv2.CV_32F)
# Create output image (centered Gaussian point--for correlation)
g = np.zeros((h, w), np.float32)
g[h//2, w//2] = 1
g = cv2.GaussianBlur(g, (-1, -1), 2.0)
g /= g.max()
# Save the desired output image in frequency space
self.G = cv2.dft(g, flags=cv2.DFT_COMPLEX_OUTPUT)
# Create transformed variants of input
self.H1 = np.zeros_like(self.G)
self.H2 = np.zeros_like(self.G)
for i in xrange(128):
# Preprocess, get DFT
a = self.preprocess(rnd_warp(img))
A = cv2.dft(a, flags=cv2.DFT_COMPLEX_OUTPUT)
self.H1 += cv2.mulSpectrums(self.G, A, 0, conjB=True) # Sum of G x F*
self.H2 += cv2.mulSpectrums( A, A, 0, conjB=True) # Sum of F x F*
# Update filter
self.update_kernel()
self.update(frame)
def furieTransform(size):
dftImage = cv2.dft(np.float32(inImg))
dftShiftImage = np.fft.fftshift(dftImage)
rows, cols = inImg.shape
centralRow, centralCol = rows / 2, cols / 2
mask = np.ones((rows, cols), np.uint8)
mask[centralRow - size:centralRow + size, centralCol - size:centralCol + size] = 0
fshift = dftShiftImage * mask
fIShift = np.fft.ifftshift(fshift)
imgResult = cv2.idft(fIShift)
cv2.imwrite("out_furie.bmp", imgResult)
def filterImg(img,filtro_magnitud):
"""Filtro para imágenes de un canal"""
#como la fase del filtro es 0 la conversión de polar a cartesiano es directa (magnitud->x, fase->y)
filtro=np.array([filtro_magnitud,np.zeros(filtro_magnitud.shape)]).swapaxes(0,2).swapaxes(0,1)
imgf=cv.dft(np.float32(img), flags=cv.DFT_COMPLEX_OUTPUT)
imgf=cv.mulSpectrums(imgf, np.float32(filtro), cv.DFT_ROWS)
return cv.idft(imgf, flags=cv.DFT_REAL_OUTPUT | cv.DFT_SCALE)
def __init__(self, img_file):
self.img = cv2.imread(img_file,0)
# Convert image to np array, shift DC to center of image
dft = cv2.dft(np.float32(self.img),flags = cv2.DFT_COMPLEX_OUTPUT)
self.dft_shift = np.fft.fftshift(dft)
self.rows, self.cols = self.img.shape
self.img_size = np.array([self.rows,self.cols])
self.crow,self.ccol = self.rows/2 , self.cols/2
# apply mask and inverse DFT
self.fshift = self.dft_shift
radius = cv2.getTrackbarPos("radius","lpFilterSpectrum")
lpType = cv2.getTrackbarPos("lpType","lpFilterSpectrum")
#第五步：构建低通滤波器
lpFilter = createLPFilter(spectrum.shape,maxLoc,radius,lpType)
#第六步：低通滤波器和快速傅里叶变换对应位置相乘（点乘）
rows,cols = spectrum.shape[:2]
fImagefft2_lpFilter = np.zeros(fImagefft2.shape,fImagefft2.dtype)
for i in xrange(2):
fImagefft2_lpFilter[:rows,:cols,i] = fImagefft2[:rows,:cols,i]*lpFilter
#低通傅里叶变换的傅里叶谱
lp_amplitude = amplitudeSpectrum(fImagefft2_lpFilter)
#显示低通滤波后的傅里叶谱的灰度级
lp_spectrum = graySpectrum(lp_amplitude)
cv2.imshow("lpFilterSpectrum", lp_spectrum)
#第七和八步：对低通傅里叶变换执行傅里叶逆变换,并只取实部
cv2.dft(fImagefft2_lpFilter,result,cv2.DFT_REAL_OUTPUT+cv2.DFT_INVERSE+cv2.DFT_SCALE)
#第九步：乘以(-1)^(r+c)
for r in xrange(rows):
for c in xrange(cols):
if (r+c)%2:
result[r][c]*=-1
#第十步：数据类型转换,并进行灰度级显示，截取左上角，大小和输入图像相等
for r in xrange(rows):
for c in xrange(cols):
if result[r][c] < 0:
result[r][c] = 0
elif result[r][c] > 255:
result[r][c] = 255
lpResult = result.astype(np.uint8)
lpResult = lpResult[:image.shape[0],:image.shape[1]]
cv2.imshow("LPFilter",lpResult)
radius = cv2.getTrackbarPos("Radius", "tracks")
lpType = cv2.getTrackbarPos("Filter type", "tracks")
nrows, ncols = img_fft.shape[:2]
# x, y = int(ncols / 2), int(nrows / 2) # Notice here are the coordinates
# ilpFilter = createHPFilter(img_fft.shape, (x, y), radius, lpType)
ilpFilter = createHPFilter(img_fft.shape, maxLoc, radius, lpType)
# 3.High pass filter
img_filter = ilpFilter * img_fft
_, gray_spectrum = graySpectrum(
img_filter) # Observe the change of the filter
# 4. Inverse Fourier transform, and take the real part for cutting, And decentralize
img_ift = cv2.dft(img_filter,
flags=cv2.DFT_INVERSE + cv2.DFT_REAL_OUTPUT +
cv2.DFT_SCALE)
ori_img = np.copy(img_ift[:rows, :cols])
for r in range(rows):
for c in range(cols):
if (r + c) % 2:
ori_img[r][c] = -1 * ori_img[r][c]
# Truncate high and low values
if ori_img[r][c] < 0:
ori_img[r][c] = 0
if ori_img[r][c] > 255:
ori_img[r][c] = 255
# ori_img[ori_img < 0] = 0
# ori_img[ori_img > 255] = 255
ori_img = ori_img.astype(np.uint8)
#negy.show()
#posx.show()
#posy.show()
#negx.show()
#negz.show()
cv2.imshow("Input",input)
outputImage.show()
img=cv2.imread('images/xpos.jpg',0)
# the following section can be removed as per wish as it contains some frequency analysis I had done on the image faces.
dft = cv2.dft(np.float32(img),flags = cv2.DFT_COMPLEX_OUTPUT)
dft_shift = np.fft.fftshift(dft)
magnitude_spectrum = 20*np.log(cv2.magnitude(dft_shift[:,:,0],dft_shift[:,:,1]))
plt.imshow(magnitude_spectrum,cmap='gray')
plt.show()
plt.imshow(img,cmap='gray')
plt.show()
hist,bins = np.histogram(magnitude_spectrum.ravel(),256,[0,256])
print hist
plt.plot(hist)
plt.show()
blur1 = cv2.GaussianBlur(img,(5,5),0)
import cv2
import numpy as np
from matplotlib import pyplot as plt
img_1 = cv2.imread('apple.jpeg', 0)
img_2 = cv2.imread('orange.jpeg', 0)
plt.subplot(121), plt.imshow(img_1, cmap='gray')
plt.title('Input Image_1'), plt.xticks([]), plt.yticks([])
plt.subplot(122), plt.imshow(img_2, cmap='gray')
plt.title('Input Image_2'), plt.xticks([]), plt.yticks([])
plt.show()
# fft on image_1
dft_1 = cv2.dft(np.float32(img_1), flags=cv2.DFT_COMPLEX_OUTPUT)
dft_shift_1 = dft_1
magnitude_spectrum_1 = cv2.magnitude(dft_shift_1[:, :, 0], dft_shift_1[:, :,
1])
dft_complex_1 = dft_shift_1[:, :, 0] + 1j * dft_shift_1[:, :, 1]
phase_1 = np.angle(dft_complex_1)
#plt.subplot(132),plt.imshow(magnitude_spectrum_1, cmap = 'gray')
#plt.title('Magnitude Spectrum_1'), plt.xticks([]), plt.yticks([])
#plt.subplot(133),plt.imshow(phase_1,cmap='gray')
#plt.title('Phase_1'),plt.xticks([]),plt.yticks([])
#fft on image_2
dft_2 = cv2.dft(np.float32(img_2), flags=cv2.DFT_COMPLEX_OUTPUT)
dft_shift_2 = dft_2
magnitude_spectrum_2 = cv2.magnitude(dft_shift_2[:, :, 0], dft_shift_2[:, :,
if len(sys.argv) > 1:
image = cv2.imread(sys.argv[1], cv2.IMREAD_GRAYSCALE)
else:
print "usage:python fft2.py imageFile"
cv2.imshow("image", image)
fft2 = fft2Image(image)
amplitude = amplitudeSpectrum(fft2)
logAmplitude = graySpectrum(amplitude)
phase = phaseSpectrum(fft2)
cosSpectrum = np.cos(phase)
sinSectrum = np.sin(phase)
meanLogAmplitude = cv2.boxFilter(logAmplitude, cv2.CV_32FC1, (3, 3))
spectralResidual = logAmplitude - meanLogAmplitude
expSR = np.exp(spectralResidual)
real = expSR * cosSpectrum
imaginary = expSR * sinSectrum
com = np.zeros((real.shape[0], real.shape[1], 2), np.float32)
com[:, :, 0] = real
com[:, :, 1] = imaginary
ifft2 = np.zeros(com.shape, np.float32)
cv2.dft(com, ifft2, cv2.DFT_COMPLEX_OUTPUT + cv2.DFT_INVERSE)
saliencymap = np.power(ifft2[:, :, 0], 2) + np.power(ifft2[:, :, 1], 2)
saliencymap = cv2.GaussianBlur(saliencymap, (31, 31), 2.5)
saliencymap = saliencymap / np.max(saliencymap)
saliencymap = np.power(saliencymap, 0.5)
saliencymap = np.round(saliencymap * 255)
saliencymap = saliencymap.astype(np.uint8)
cv2.imshow("saliencymap", saliencymap)
cv2.waitKey(0)
cv2.destroyAllWindows()
def fftd(img, backwards=False):
# shape of img can be (m,n), (m,n,1) or (m,n,2)
# in my test_videos, fft provided by numpy and scipy are slower than cv2.dft
return cv2.dft(np.float32(img), flags=(
(cv2.DFT_INVERSE | cv2.DFT_SCALE) if backwards else cv2.DFT_COMPLEX_OUTPUT)) # 'flags =' is necessary!
def fourierFilter(img):
"""
fourierFilter()
Usage: Applies fourier filter to the image for noise reduction.
Image needs to be filtered since origanl image is very noisey which causes issue with fringe finding
Source: https://github.com/bnsreenu/python_for_image_processing_APEER/blob/master/tutorial41_image_filters_using_fourier_transform_DFT.py
[In]: img -> Input Image for noise reduction
[Out]: img_back -> Image with fourier filter applied
TODO:
1- Fourier filter is not working as expected and work needs to be done on this.
Could look for some other ways to reduce noise if fft doesnt work
2- It applys a circular mask on the origanl image but could also do with a cross (as done
in mathematica). The code commented out does apply a cross mask but that doesn't work either
"""
dft=cv2.dft(np.float32(img),flags=cv2.DFT_COMPLEX_OUTPUT)
dft_shift=np.fft.fftshift(dft)
magnitude_spectrum = 20 * np.log(cv2.magnitude(dft_shift[:, :, 0], dft_shift[:, :, 1]))
dia=int(diameter.get())
rows, cols = img.shape
mask = np.zeros((rows, cols, 2), np.uint8)
r = 100
x, y = np.ogrid[:rows, :cols]
mask_area = (x - center[0]) ** 2 + (y - center[1]) ** 2 <= r*r
mask[mask_area] = 1
"""
np_mask_horizontal=np.array([])
mask=[]
for i in range(rows):
for j in range(cols):
a=np.array([1-math.exp(-(i-cols/2)**2/9)])
b=np.array([1-math.exp(-(i-cols/2)**2/9)])
np_mask_horizontal=np.concatenate((a,b))
mask.append(np_mask_horizontal)
horizontal_line=np.array([mask])
horizontal_line=np.reshape(horizontal_line,(dia*2,dia*2,2))
np_mask_vertical=np.array([])
mask.clear()
for i in range (rows):
for j in range (cols):
a=np.array([1-math.exp(-(j-cols/2)**2/9)])
b=np.array([1-math.exp(-(j-cols/2)**2/9)])
np_mask_vertical=np.concatenate((a,b))
mask.append(np_mask_vertical)
vertical_line=np.array([mask])
vertical_line=np.reshape(vertical_line,(dia*2,dia*2,2))
fourierfactor3=0.005
fourierfactor4=0.05
np_mask=np.array([])
mask.clear()
for i in range(rows):
for j in range(cols):
a=np.array([1-(1-fourierfactor4)*math.exp(-(math.sqrt(min(j,cols-j)**2 + min(i,rows-i)**2)/(0.5*rows))**2/fourierfactor3**2)])
b=np.array([1-(1-fourierfactor4)*math.exp(-(math.sqrt(min(j,cols-j)**2 + min(i,rows-i)**2)/(0.5*rows))**2/fourierfactor3**2)])
np_mask=np.concatenate((a,b))
mask.append(np_mask)
additional_filter=np.array([mask])
additional_filter=np.reshape(additional_filter,(dia*2,dia*2,2))
#print(additional_filter)
"""
# apply mask and inverse DFT: Multiply fourier transformed image (values)
#with the mask values.
fshift = dft_shift* mask
print(fshift)
#Get the magnitude spectrum (only for plotting purposes)
fshift_mask_mag = 20 * np.log(cv2.magnitude(fshift[:, :, 0], fshift[:, :, 1]))
#Inverse shift to shift origin back to top left.
f_ishift = np.fft.ifftshift(fshift)
#Inverse DFT to convert back to image domain from the frequency domain.
#Will be complex numbers
img_back = cv2.idft(f_ishift)
#Magnitude spectrum of the image domain
img_back = cv2.magnitude(img_back[:, :, 0], img_back[:, :, 1])
fig = plt.figure(figsize=(12, 12))
ax1 = fig.add_subplot(2,2,1)
ax1.imshow(img, cmap='gray')
ax1.title.set_text('Input Image')
ax2 = fig.add_subplot(2,2,2)
ax2.imshow(magnitude_spectrum, cmap='gray')
ax2.title.set_text('FFT of image')
ax3 = fig.add_subplot(2,2,3)
ax3.imshow(fshift_mask_mag, cmap='gray')
ax3.title.set_text('FFT + Mask')
ax4 = fig.add_subplot(2,2,4)
ax4.imshow(img_back, cmap='gray')
ax4.title.set_text('After inverse FFT')
plt.show()
return img_back
def Fourier(img):
dft = cv2.dft(np.float32(img), flags=cv2.DFT_COMPLEX_OUTPUT)
dft_shift = np.fft.fftshift(dft)
spectrum = cv2.magnitude(dft_shift[:, :, 0], dft_shift[:, :, 1])
log_spectrum = 20 * np.log1p(spectrum)
return log_spectrum
def calculate_fourier(img):
"""
Method calculates thr Fourier coefficients of an 2-D numpy array
"""
dft = cv2.dft(np.float32(img), flags=cv2.DFT_COMPLEX_OUTPUT)
return np.fft.fftshift(dft)
def get_noise_fft(Y,
noise_range=[0.25, 0.5],
noise_method='logmexp',
max_num_samples_fft=3072,
opencv=True):
"""Estimate the noise level for each pixel by averaging the power spectral density.
Inputs:
-------
Y: np.ndarray
Input movie data with time in the last axis
noise_range: np.ndarray [2 x 1] between 0 and 0.5
Range of frequencies compared to Nyquist rate over which the power spectrum is averaged
default: [0.25,0.5]
noise method: string
method of averaging the noise.
Choices:
'mean': Mean
'median': Median
'logmexp': Exponential of the mean of the logarithm of PSD (default)
Output:
------
sn: np.ndarray
Noise level for each pixel
"""
T = Y.shape[-1]
# Y=np.array(Y,dtype=np.float64)
if T > max_num_samples_fft:
Y = np.concatenate(
(Y[..., 1:max_num_samples_fft // 3 + 1],
Y[...,
np.int(T // 2 - max_num_samples_fft / 3 /
2):np.int(T // 2 + max_num_samples_fft / 3 / 2)],
Y[..., -max_num_samples_fft // 3:]),
axis=-1)
T = np.shape(Y)[-1]
# we create a map of what is the noise on the FFT space
ff = np.arange(0, 0.5 + 1. / T, 1. / T)
ind1 = ff > noise_range[0]
ind2 = ff <= noise_range[1]
ind = np.logical_and(ind1, ind2)
# we compute the mean of the noise spectral density s
if Y.ndim > 1:
if opencv:
import cv2
psdx = []
for y in Y.reshape(-1, T):
dft = cv2.dft(
y, flags=cv2.DFT_COMPLEX_OUTPUT).squeeze()[:len(ind)][ind]
psdx.append(np.sum(1. / T * dft * dft, 1))
psdx = np.reshape(psdx, Y.shape[:-1] + (-1, ))
else:
xdft = np.fft.rfft(Y, axis=-1)
xdft = xdft[..., ind[:xdft.shape[-1]]]
psdx = 1. / T * abs(xdft)**2
psdx *= 2
sn = mean_psd(psdx, method=noise_method)
else:
xdft = np.fliplr(np.fft.rfft(Y))
psdx = 1. / T * (xdft**2)
psdx[1:] *= 2
sn = mean_psd(psdx[ind[:psdx.shape[0]]], method=noise_method)
return sn, psdx
import cv2
from matplotlib import pyplot as plt
# Load the image in gray scale
img = cv2.imread('../data/messi5.jpg', 0)
rows, cols = img.shape
# Transform the image to improve the speed in the fourier transform calculation
optimalRows = cv2.getOptimalDFTSize(rows)
optimalCols = cv2.getOptimalDFTSize(cols)
optimalImg = np.zeros((optimalRows, optimalCols))
optimalImg[:rows, :cols] = img
crow, ccol = optimalRows / 2, optimalCols / 2
# Calculate the discrete Fourier transform
dft = cv2.dft(np.float32(optimalImg), flags=cv2.DFT_COMPLEX_OUTPUT)
dftShift = np.fft.fftshift(dft)
# Mask everything except the center
mask = np.zeros((optimalRows, optimalCols, 2), np.uint8)
mask[crow - 30:crow + 30, ccol - 30:ccol + 30] = 1
dftShift = dftShift * mask
# Rescale the values for visualization purposes
magnitudeSpectrum = 20 * np.log(
cv2.magnitude(dftShift[:, :, 0], dftShift[:, :, 1]))
# Reconstruct the image using the inverse Fourier transform
newDft = np.fft.ifftshift(dftShift)
result = cv2.idft(newDft)
result = cv2.magnitude(result[:, :, 0], result[:, :, 1])
m = cv.getOptimalDFTSize(rows)
n = cv.getOptimalDFTSize(cols)
padded = cv.copyMakeBorder(img,
0,
m - rows,
0,
n - cols,
cv.BORDER_CONSTANT,
value=[0, 0, 0])
# print(padded.shape)
# padded.dtype = np.float32
# print(padded.shape)
#print(padded.dtype)
planes = [np.float32(padded), np.zeros(padded.shape, np.float32)]
complexI = cv.merge(planes)
cv.dft(complexI, complexI)
cv.split(complexI, planes)
# print(planes[0])
cv.magnitude(planes[0], planes[1], planes[0]) #magnitude()的意义为根号下平方和 即 计算辐值
magI = planes[0]
matOfones = np.ones(magI.shape, dtype=magI.dtype)
cv.add(matOfones, magI, magI)
cv.log(magI, magI)
#print(magI.dtype)
magI_rows, magI_cols = magI.shape
magI = magI[0:(magI_rows & -2), 0:(magI_cols & -2)]
cx = int(magI_rows / 2)
cy = int(magI_cols / 2)
q0 = magI[0:cx, 0:cy] # Top-Left - Create a ROI per quadrant
def main(): #argv):
timeStart = time.time()
# Step 1 - Apply FFT on both images and get their magnitude spectrums
# image (we are looking for), lets call it original
imgOriginal, imgOriginalFft, imgOriginalMags = readImage(
"D:/Maria/April/fourier_mellin/test_data/Mio1.jpg"
) #("D:/Maria/April/fourier_mellin/test_data/orig.png")#readImage(argv[1])
# image (we are searching in), lets call it transformed
imgTransformed, imgTransformedFft, imgTransformedMags = readImage(
"D:/Maria/April/fourier_mellin/test_data/sdddd.png"
) #("D:/Maria/April/fourier_mellin/test_data/test.png")#readImage(argv[2])
# Step 2 - Apply highpass filter on their magnitude spectrums
highPassFilter = prepareHighPassFilter(imgOriginalMags)
imgOriginalMagsFilter = imgOriginalMags * highPassFilter
imgTransformedMagsFilter = imgTransformedMags * highPassFilter
# Step 3 - Convert magnitudes both images to log-polar coordinates
# Step 3.1 - Precompute parameters (both images have the same dimensions)
centerTrans, angleStep, logBase = computeLogPolarParameters(
imgOriginalMagsFilter)
imgOriginalLogPolar = convertToLogPolar(imgOriginalMagsFilter, centerTrans,
angleStep, logBase, polarMode)
imgTransformedLogPolar = convertToLogPolar(imgTransformedMagsFilter,
centerTrans, angleStep, logBase,
polarMode)
# Step 3.1 - Apply FFT on magnitude spectrums in log polar coordinates (in this case, not using FFT shift as it leads to computing [180-angle] results)
imgOriginalLogPolarComplex = cv2.dft(np.float32(imgOriginalLogPolar),
flags=cv2.DFT_COMPLEX_OUTPUT)
imgTransformedLogPolarComplex = cv2.dft(np.float32(imgTransformedLogPolar),
flags=cv2.DFT_COMPLEX_OUTPUT)
# Step 4 - Apply phase corelation on both images (FFT applied on log polar images) to retrieve rotation (angle) and scale factor
angle, scale = phaseCorrelation(imgOriginalLogPolarComplex,
imgTransformedLogPolarComplex)
# Step 4.1 Convert to degrees based on formula in paper (26) and adjust it to (-pi/2, pi/2) range
angleDeg = -(float(angle) * 180.0) / imgOriginalLogPolarComplex.shape[0]
if angleDeg < -45:
angleDeg += 180
else:
if angleDeg > 90.0:
angleDeg -= 180
# Step 4.2 Calculate scale factor based on formula in paper (25)
scaleFactor = logBase**scale
# Step 5 - Apply rotation and scaling on transformed image
transformMatrix = cv2.getRotationMatrix2D((centerTrans[0], centerTrans[1]),
angleDeg, scaleFactor)
imgTransformedNew = cv2.warpAffine(
imgTransformed, transformMatrix,
(imgTransformed.shape[1], imgTransformed.shape[0]))
# Step 6 - Apply phase corelation on both images to retrieve translation
# Step 6.1 Apply FFT to newly created transformed image
imgTransformedNewFft, imgTransformedNewftShifted = calculateFft(
imgTransformedNew)
# Step 6.2 - Use phase corelation to get translation coordinates
y, x = phaseCorrelation(imgTransformedNewftShifted, imgOriginalFft)
# Step 6.3 Apply translation on the final image
if x > imgOriginal.shape[0] // 2:
x -= imgOriginal.shape[0]
if y > imgOriginal.shape[1] // 2:
y -= imgOriginal.shape[1]
translationMatrix = np.float32([[1, 0, -x], [0, 1, -y]])
imgFinal = cv2.warpAffine(
imgTransformedNew, translationMatrix,
(imgTransformed.shape[1], imgTransformed.shape[0]))
timeEnd = time.time()
# Step 7 - Return final results (rotation, scale factor, translation)
print("Angle = " + str(angleDeg) + " Deg")
print("Scale = " + str(scaleFactor))
print("Translation")
print("X = " + str(-x))
print("Y = " + str(-y))
print("Time = " + str(timeEnd - timeStart))
if resultsComparation:
plt.subplot(221), plt.imshow(imgOriginal, cmap='gray')
plt.subplot(222), plt.imshow(imgTransformed, cmap='gray')
plt.subplot(223), plt.imshow(imgOriginal - imgFinal, cmap='bwr')
plt.subplot(224), plt.imshow(imgFinal, cmap='gray')
plt.show()
else:
plt.subplot(521), plt.imshow(imgOriginal, cmap='gray')
plt.subplot(522), plt.imshow(imgTransformed, cmap='gray')
plt.subplot(523), plt.imshow(imgOriginalMagsFilter, cmap='gray')
plt.subplot(524), plt.imshow(imgTransformedMagsFilter, cmap='gray')
plt.subplot(525), plt.imshow(imgOriginalLogPolar, cmap='gray')
plt.subplot(526), plt.imshow(imgTransformedLogPolar, cmap='gray')
plt.subplot(527), plt.imshow(imgTransformedNew, cmap='gray')
plt.subplot(528), plt.imshow(imgOriginal - imgFinal, cmap='bwr')
plt.subplot(529), plt.imshow(imgFinal, cmap='gray')
plt.show()
padded = cv.copyMakeBorder(image,
0,
M - image.shape[0],
0,
N - image.shape[1],
cv.BORDER_CONSTANT,
value=0)
planes_0 = np.array(padded, dtype='float32')
planes_1 = np.zeros(padded.shape, dtype='float32')
planes2_0 = np.array(padded, dtype='float32')
planes2_1 = np.zeros(padded.shape, dtype='float32')
complexImg = cv.merge((planes_0, planes_1))
complexImg = cv.dft(complexImg)
complexImg2 = cv.merge((planes2_0, planes2_1))
complexImg2 = cv.dft(complexImg2)
filter1 = complexImg.copy()
filter1 = create_ButterworthLowpassFilter(filter1, radius, order, width)
filter2 = complexImg2.copy()
filter2 = create_ButterworthHighpassFilter(filter2, radius2, order2, width)
complexImg = shiftDFT(complexImg)
complexImg = cv.mulSpectrums(complexImg, filter1, 0)
complexImg = shiftDFT(complexImg)
complexImg2 = shiftDFT(complexImg2)
complexImg2 = cv.mulSpectrums(complexImg2, filter2, 0)
[[34, 56, 1, 0, 255, 230, 45, 12], [0, 201, 101, 125, 52, 12, 124, 12],
[3, 41, 42, 40, 12, 90, 123, 45], [5, 245, 98, 32, 34, 234, 90, 123],
[12, 12, 10, 41, 56, 89, 189, 5], [112, 87, 12, 45, 78, 45, 10, 1],
[42, 123, 234, 12, 12, 21, 56, 43], [1, 2, 45, 123, 10, 44, 123, 90]],
np.float64)
#卷积核
kernel = np.array([[1, 0, -1], [1, 0, 1], [1, 0, -1]], np.float64)
# I 与 kernel 进行全卷积
confull = signal.convolve2d(I,
kernel,
mode='full',
boundary='fill',
fillvalue=0)
# I 的傅里叶变换
FT_I = np.zeros((I.shape[0], I.shape[1], 2), np.float64)
cv2.dft(I, FT_I, cv2.DFT_COMPLEX_OUTPUT)
# kernel 的傅里叶变换
FT_kernel = np.zeros((kernel.shape[0], kernel.shape[1], 2), np.float64)
cv2.dft(kernel, FT_kernel, cv2.DFT_COMPLEX_OUTPUT)
# 傅里叶变换
fft2 = np.zeros((confull.shape[0], confull.shape[1]), np.float64)
#对 I 进行右侧和下侧补 0
I_Padded = np.zeros(
(I.shape[0] + kernel.shape[0] - 1, I.shape[1] + kernel.shape[1] - 1),
np.float64)
I_Padded[:I.shape[0], :I.shape[1]] = I
FT_I_Padded = np.zeros((I_Padded.shape[0], I_Padded.shape[1], 2),
np.float64)
cv2.dft(I_Padded, FT_I_Padded, cv2.DFT_COMPLEX_OUTPUT)
#对 kernel 进行右侧和下侧补 0
kernel_Padded = np.zeros(
def process(ip_image):
###########################
## Your Code goes here
print("in loop")
b, g, r = cv2.split(ip_image)
# defining an array consisting of b,g,r channles of the blur image
img_array = [b, g, r]
# defining an empty array to store the final image
final_img = np.empty((840, 1600, 3))
# defining the angel, dis, load/noise values to be used in the program
# below for restoring the image of different channels
angle = [87, 90, 93]
dis = [20, 22, 20]
load = [22, 17, 18]
i = 0
# now applying the restoration algo on each channel one by one
for color in img_array:
img_channel = np.float32(color) / 255.0
# forming a blur image from the given image
d = 31
# returns a tuple of number of rows, columns and channels of the image
height, width = img_channel.shape[:2]
# Creating a border around the image
img_pad = cv2.copyMakeBorder(img_channel, d, d, d, d, cv2.BORDER_WRAP)
# Blurring bordered image using a gaussian function and storing it in img_blur
img_blur = cv2.GaussianBlur(img_pad, (2 * d + 1, 2 * d + 1), -1)[d:-d,
d:-d]
# Returning an a array representing the indices of matrix
y, x = np.indices((height, width))
# returning an array formed by stacking x and y and concatenating along 3rd dimension
dist = np.dstack([x, width - x - 1, y, height - y - 1]).min(-1)
# Comparing both the arrays and returning the element wise minimum value to array elements
w = np.minimum(np.float32(dist) / d, 1.0)
blur_img = img_channel * w + img_channel * (1 - w)
#----------------------------------------------
# Applying discrete fourier transform on blur image since images are collection of discrete values in time domain
# so we are converting them into frequency domain
dft_image = cv2.dft(blur_img, flags=cv2.DFT_COMPLEX_OUTPUT)
# Defining angle ang and converting it from degree to radian assigning variable d and noise with respective values
ang = np.deg2rad(angle[i])
d = dis[i]
noise = 10**(-0.1 * load[i])
# Defining degradation_kernel using motion kernel
# making a kernel of size 20x20
sz = 20
# Creating an array of the given parameters with ones
kernel = np.ones((1, d), np.float32)
# Defining trigonometric cosine as c and trigonoetric sine as s
c, s = np.cos(ang), np.sin(ang)
# Assigning matrix A with given parameters defind above with 32-bit floating values
A = np.float32([[c, -s, 0], [s, c, 0]])
sz2 = sz // 2
A[:, 2] = (sz2, sz2) - np.dot(A[:, :2], ((d - 1) * 0.5, 0))
# transforming the kern image using the specified matrix
deg_kernel = cv2.warpAffine(kernel, A, (sz, sz), flags=cv2.INTER_CUBIC)
#--------------------------------------------------------
deg_kernel /= deg_kernel.sum()
# creating a zero matrix of the size of img that will be used for padding
deg_pad = np.zeros_like(img_channel)
kh, kw = deg_kernel.shape
# padding the kernel to get the degradation function of the same size as that of the image
deg_pad[:kh, :kw] = deg_kernel
# Performing the DFT on the psf_pad and saving it in deg_kernel_dft
# First channel will have the real part of the result and second channel will have the imaginary part of the result
deg_dft = cv2.dft(deg_pad,
flags=cv2.DFT_COMPLEX_OUTPUT,
nonzeroRows=kh)
# taking magnitude of the complex values
deg_dft_2 = (deg_dft**2).sum(-1)
i_deg_dft_2 = deg_dft / (deg_dft_2 + noise)[..., np.newaxis]
# Performing element wise multiplication of the two matrix IMG and iPSF that are results of a real or complex fourier transform
Restored_img = cv2.mulSpectrums(dft_image, i_deg_dft_2, 0)
# RES is our restored image in frequency domain now converting it in time domain by performing idft
restored_img = cv2.idft(Restored_img,
flags=cv2.DFT_SCALE | cv2.DFT_REAL_OUTPUT)
# Rolling res array elements along a given axis i.e 0 and 1
restored_img = np.roll(restored_img, -kh // 2, 0)
restored_img = np.roll(restored_img, -kw // 2, 1)
final_img[:, :, i] = restored_img
i += 1
final_img = (final_img / np.max(final_img)) * 255
final_img = final_img.astype(np.uint8)
brightness = 95
contrast = 85
highlight = 255
shadow = brightness
alpha_b = (highlight - shadow) / 255
gamma_b = shadow
buf = cv2.addWeighted(final_img, alpha_b, final_img, 0, gamma_b)
f = float(131 * (contrast + 127)) / (127 * (131 - contrast))
alpha_c = f
gamma_c = 127 * (1 - f)
final_img = cv2.addWeighted(buf, alpha_c, buf, 0, gamma_c)
det_aruco_list = detect_Aruco(final_img)
# print(det_aruco_list)
if det_aruco_list:
ip_image = mark_Aruco(final_img, det_aruco_list)
robot_state = calculate_Robot_State(final_img, det_aruco_list)
print(robot_state)
###########################
id_list = robot_state[25]
return ip_image, id_list
def fftGetMagAndPse(img_grey):
img_freq = cv2.dft(np.float64(img_grey), flags=cv2.DFT_COMPLEX_OUTPUT)
r, i = cv2.split(img_freq)
return cv2.magnitude(r, i), cv2.phase(r, i)
# =============================================================================
# cv2.dft()
# np.fft.fftshift()
# np.fft.ifftshift()
# cv2.idft()
# magnitude(img_back[:,:,0],img[:,:,1]) 从复数变成实数
# =============================================================================
openCv中相应的函数时cv2.dft()和cv2.idft()。和前面输出的结果一样，但是双通道的。第一个通道是结果的实数
部分，第二个通道是结果的虚数部分。输入图像首先转换成np.float32格式，我们来看看如何操作
import cv2
import numpy as np
from matplotlib import pyplot as plt
img=cv2.imread('messi.jpg',0)
dft=cv2.dft(np.float32(img),flags=cv2.DFT_COMPLEX_OUTPUT)
dft_shift=np.fft.fftshift(dft)
magnitude_spectrum=20*np.log(cv2.magnitude(dft_shift[:,:,0],dft_shift[:,:,1]))#cv2.magnitude计算梯度/幅度 等价于np.abs 验证确实如此
#plt.subplot(121),plt.imshow(img,cmap='gray')
#plt.title('input image'),plt.xticks([]),plt.yticks([])
#plt.subplot(122),plt.imshow(magnitude_spectrum,cmap='gray')
#plt.title('M s'),plt.xticks([]),plt.yticks([])
#plt.show()
##这里也可以用cv2.cartToPalar()，它会同时返回幅度和相位
#现在我们来做逆变换DFT，在前面的部分，我们实现了一个HPF（高频滤波），现在我们来做LPF(低通
#滤波)将高频部分去除，其实就是对图像进行模糊操作。首先我们需要构建一个掩码，与低频区域对应的地方设置1
#高频区域对于地方设为0
rows,cols=img.shape
crow,ccol=np.uint8(rows/2),np.uint8(cols/2)
#mask
def DFT(image):
fft = cv2.dft(np.float32(image), flags=cv2.DFT_COMPLEX_OUTPUT)
return np.array([fft[:, :, 0], fft[:, :, 1]])
def main(argv):
print_help()
filename = argv[0] if len(argv) > 0 else "../../../../data/lena.jpg"
I = cv.imread(filename, cv.IMREAD_GRAYSCALE)
if I is None:
print('Error opening image')
return -1
## [expand]
rows, cols = I.shape
m = cv.getOptimalDFTSize(rows)
n = cv.getOptimalDFTSize(cols)
padded = cv.copyMakeBorder(I,
0,
m - rows,
0,
n - cols,
cv.BORDER_CONSTANT,
value=[0, 0, 0])
## [expand]
## [complex_and_real]
planes = [np.float32(padded), np.zeros(padded.shape, np.float32)]
complexI = cv.merge(planes) # Add to the expanded another plane with zeros
## [complex_and_real]
## [dft]
cv.dft(complexI,
complexI) # this way the result may fit in the source matrix
## [dft]
# compute the magnitude and switch to logarithmic scale
# = > log(1 + sqrt(Re(DFT(I)) ^ 2 + Im(DFT(I)) ^ 2))
## [magnitude]
cv.split(complexI, planes) # planes[0] = Re(DFT(I), planes[1] = Im(DFT(I))
cv.magnitude(planes[0], planes[1], planes[0]) # planes[0] = magnitude
magI = planes[0]
## [magnitude]
## [log]
matOfOnes = np.ones(magI.shape, dtype=magI.dtype)
cv.add(matOfOnes, magI, magI) # switch to logarithmic scale
cv.log(magI, magI)
## [log]
## [crop_rearrange]
magI_rows, magI_cols = magI.shape
# crop the spectrum, if it has an odd number of rows or columns
magI = magI[0:(magI_rows & -2), 0:(magI_cols & -2)]
cx = int(magI_rows / 2)
cy = int(magI_cols / 2)
q0 = magI[0:cx, 0:cy] # Top-Left - Create a ROI per quadrant
q1 = magI[cx:cx + cx, 0:cy] # Top-Right
q2 = magI[0:cx, cy:cy + cy] # Bottom-Left
q3 = magI[cx:cx + cx, cy:cy + cy] # Bottom-Right
tmp = np.copy(q0) # swap quadrants (Top-Left with Bottom-Right)
magI[0:cx, 0:cy] = q3
magI[cx:cx + cx, cy:cy + cy] = tmp
tmp = np.copy(q1) # swap quadrant (Top-Right with Bottom-Left)
magI[cx:cx + cx, 0:cy] = q2
magI[0:cx, cy:cy + cy] = tmp
## [crop_rearrange]
## [normalize]
cv.normalize(
magI, magI, 0, 1,
cv.NORM_MINMAX) # Transform the matrix with float values into a
## viewable image form(float between values 0 and 1).
## [normalize]
cv.imshow("Input Image", I) # Show the result
cv.imshow("spectrum magnitude", magI)
cv.waitKey()
def transform(img):
dft = cv.dft(np.float32(img), flags=cv.DFT_COMPLEX_OUTPUT)
return dft
im = cv2.cvtColor(im, cv2.COLOR_BGR2GRAY)
h, w = im.shape[:2]
realInput = im.astype(np.float64)
# perform an optimally sized dft
dft_M = cv2.getOptimalDFTSize(w)
dft_N = cv2.getOptimalDFTSize(h)
# copy A to dft_A and pad dft_A with zeros
dft_A = np.zeros((dft_N, dft_M, 2), dtype=np.float64)
dft_A[:h, :w, 0] = realInput
# no need to pad bottom part of dft_A with zeros because of
# use of nonzeroRows parameter in cv2.dft()
cv2.dft(dft_A, dst=dft_A, nonzeroRows=h)
cv2.imshow("win", im)
# Split fourier into real and imaginary parts
image_Re, image_Im = cv2.split(dft_A)
# Compute the magnitude of the spectrum Mag = sqrt(Re^2 + Im^2)
magnitude = cv2.sqrt(image_Re**2.0 + image_Im**2.0)
# Compute log(1 + Mag)
log_spectrum = cv2.log(1.0 + magnitude)
# Rearrange the quadrants of Fourier image so that the origin is at
# the image center
shift_dft(log_spectrum, log_spectrum)
for i in range(10): plt.close()
image1_filename = "../test_images/consecutive_frames_before.jpg"
image2_filename = "../test_images/consecutive_frames_after.jpg"
image1 = cv2.imread(image1_filename)[:,:,0]
image2 = cv2.imread(image2_filename)[:,:,0]
crop_size = 1800
image1_cp = image1[:crop_size, :crop_size]
image2_cp = image2[:crop_size, :crop_size]
f1 = cv2.dft(image1_cp.astype(np.float32), flags=cv2.DFT_COMPLEX_OUTPUT)
f2 = cv2.dft(image2_cp.astype(np.float32), flags=cv2.DFT_COMPLEX_OUTPUT)
f1_shf = np.fft.fftshift(f1)
f2_shf = np.fft.fftshift(f2)
f1_shf_cplx = f1_shf[:,:,0]*1j + 1*f1_shf[:,:,1]
f2_shf_cplx = f2_shf[:,:,0]*1j + 1*f2_shf[:,:,1]
f1_shf_abs = np.abs(f1_shf_cplx)
f2_shf_abs = np.abs(f2_shf_cplx)
total_abs = f1_shf_abs * f2_shf_abs
P_real = (np.real(f1_shf_cplx)*np.real(f2_shf_cplx) +
np.imag(f1_shf_cplx)*np.imag(f2_shf_cplx))/total_abs
P_imag = (np.imag(f1_shf_cplx)*np.real(f2_shf_cplx) +
from mpl_toolkits.mplot3d import axes3d
# MARK: image
img = cv2.imread(
'/Users/ariazare/Projects/Python/DEP_C4/Fig0438(a)(bld_600by600).tif')
img = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY)
img_padded = np.zeros((602, 602), 'float32')
img_padded[:-2, 0:-2] = img
img_centered = utilities.center_frequency(img_padded)
complex_img = [
np.array(img_centered, 'float32'),
np.zeros(img_centered.shape, 'float32')
]
complex_img = cv2.merge(complex_img)
cv2.dft(complex_img, complex_img)
# img_mag = utilities.get_magnitude(complex_img)
# img_mag = cv2.log(img_mag,img_mag)
# img_phase = utilities.get_phase_angel(complex_img)
# plt.imshow(img_mag, 'Greys')
# plt.show()
# MARK: sobel filter kernal
sobel_filter = np.array(
[[0, 0, 0, 0], [0, -1, 0, 1], [0, -2, 0, 2], [0, -1, 0, 1]], 'float32')
sobel_filter_sp = np.array([[-1, 0, 1], [-2, 0, 2], [-1, 0, 1]], 'float32')
sobel_filter_zeros = np.zeros((602, 602), 'float32')
win = 'deconvolution'
img = cv2.imread(fn, 0) #read image
if img is None:
print('Failed to load image!:', fn)
sys.exit(1)
img = np.float32(img)/255.0
cv2.imshow('input', img) #show input
img = blur_edge(img)
IMG = cv2.dft(img, flags=cv2.DFT_COMPLEX_OUTPUT) #fourier transformation
defocus = '--circle' in opts
def update(_):
ang = np.deg2rad( cv2.getTrackbarPos('Angle', win) ) #get values according to the trackbar position
d = cv2.getTrackbarPos('d', win)
noise = 10**(-0.1*cv2.getTrackbarPos('SNR (db)', win))
if defocus:
psf = defocus_kernel(d)
else:
psf = motion_kernel(ang, d)
cv2.imshow('psf', psf)
psf /= psf.sum()
import cv2
import matplotlib.pyplot as plt
import numpy as np
# opencv中的DFT（Discrete Fourier Transform）
img = cv2.imread("./images/1.jpg")
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
rows, cols = gray.shape
# 1.DFT离散傅里叶变换：空域-->频域
dft = cv2.dft(
src=np.float32(gray),
flags=cv2.DFT_COMPLEX_OUTPUT) # cv2.DFT_COMPLEX_OUTPUT表示进行傅里叶变化的方法
print(dft.shape) # (540, 960, 2) 2表示两个通道
# 2.中心化：将低频移动到图像中心
fftshift = np.fft.fftshift(dft)
# 获取振幅谱（展示图片用）：20*np.log()是为了将值限制在[0, 255]
magnitude_spectrum = 20 * np.log(
cv2.magnitude(fftshift[:, :, 0], fftshift[:, :, 1]))
# 3.滤波操作之低通滤波（去高频，保低频）
mask = np.zeros((rows, cols, 2), dtype=np.uint8)
mask[(rows // 2 - 30):(rows // 2 + 30), (cols // 2 - 30):(cols // 2 + 30)] = 1
fftshift = fftshift * mask
# 4.去中心化：将低频和高频的位置还原
ifftshift = np.fft.ifftshift(fftshift)
# 5.逆傅里叶变换：频域-->空域
idft = cv2.idft(ifftshift)
fn = args[0]
except:
fn = '../data/licenseplate_motion.jpg'
win = 'deconvolution'
img = cv.imread(fn, 0)
if img is None:
print('Failed to load fn1:', fn1)
sys.exit(1)
img = np.float32(img)/255.0
cv.imshow('input', img)
img = blur_edge(img)
IMG = cv.dft(img, flags=cv.DFT_COMPLEX_OUTPUT)
defocus = '--circle' in opts
def update(_):
ang = np.deg2rad( cv.getTrackbarPos('angle', win) )
d = cv.getTrackbarPos('d', win)
noise = 10**(-0.1*cv.getTrackbarPos('SNR (db)', win))
if defocus:
psf = defocus_kernel(d)
else:
psf = motion_kernel(ang, d)
cv.imshow('psf', psf)
psf /= psf.sum()
# You Can Think Of Frequency In An Image As The Rate Of Change. Parts Of The Image
# That Change Rapidly From One Color To Another (Sharp Edges) Contain High Frequencies
# And Parts That Change Gradually (E.G., Large Surgaces With Solid Colors) Contain
# Only Low Frequencies
# Import Needed Packages
import matplotlib.pyplot as plt
import numpy as np
import cv2
# Load Image As GS, Convert, Scale
image = cv2.imread('../data/Lena.png', 0).astype(np.float32) / 255
# Apply Discrete Fourier Transform
# Print Shape And Data Type
fft = cv2.dft(image, flags=cv2.DFT_COMPLEX_OUTPUT)
print("FFT Shape: ", fft.shape)
print("FFT DType: ", fft.dtype)
# Visualize Image Spectrum
# Shift In Such A Way That The Amplitude Corresponding To Zero
# Frequency Becomes Located At Center Of Image
shifted = np.fft.fftshift(fft, axes=[0, 1])
magnitude = cv2.magnitude(shifted[:, :, 0], shifted[:, :, 1])
magnitude = np.log(magnitude)
magnitude -= magnitude.min()
magnitude /= magnitude.max()
# Convert From Frequency Spectrum Back To Spatial Representation
restored = cv2.idft(fft, flags=cv2.DFT_SCALE | cv2.DFT_REAL_OUTPUT)
import cv2
import numpy as np
from matplotlib import pyplot as plt
# le imagem quad
img = cv2.imread('quad.bmp', 0)
dft = cv2.dft(np.float32(img), flags=cv2.DFT_COMPLEX_OUTPUT)
dft_shift = np.fft.fftshift(dft)
# multiplicacao
magnitude_spectrum = 20 * np.log(cv2.magnitude(dft_shift[:, :, 0], dft_shift[:, :, 1]))
rows, cols = img.shape
crow, ccol = int(rows / 2), int(cols / 2)
mask = np.zeros((rows, cols, 2), np.uint8)
num = 10
mask[crow - num:crow + num, ccol - num:ccol + num] = 1
fshift = dft_shift * mask
f_ishift = np.fft.ifftshift(fshift)
img_back = cv2.idft(f_ishift)
img_back = cv2.magnitude(img_back[:, :, 0], img_back[:, :, 1])
plt.subplot(121), plt.imshow(img, cmap='gray')
plt.title('Input Image'), plt.xticks([]), plt.yticks([])
plt.subplot(122), plt.imshow(img_back, cmap='gray')
plt.title('Magnitude Spectrum'), plt.xticks([]), plt.yticks([])
plt.show()
# Arrays whose size is a product of 2's, 3's, and 5's are also processed quite efficiently.
# Hence ee modify the size of the array tothe optimal size (by padding zeros) before finding DFT.
pad_right = nwidth - width
pad_bottom = nheight - hieght
nframe = cv2.copyMakeBorder(gray_frame,
0,
pad_bottom,
0,
pad_right,
cv2.BORDER_CONSTANT,
value=0)
# perform the DFT and get complex output
dft = cv2.dft(np.float32(nframe), flags=cv2.DFT_COMPLEX_OUTPUT)
# shift it so that we the zero-frequency, F(0,0), DC component to the center of the spectrum.
dft_shifted = np.fft.fftshift(dft)
# perform high pass filtering
radius = cv2.getTrackbarPos("radius", windowName2)
hp_filter = create_high_pass_filter(nwidth, nheight, radius)
dft_filtered = cv2.mulSpectrums(dft_shifted, hp_filter, flags=0)
# shift it back to original quaderant ordering
dft = np.fft.fftshift(dft_filtered)