def calculate_sky_energy(border, src_image):
# 制作天空图像掩码和地面图像掩码
sky_mask = make_sky_mask(src_image, border, 1)
ground_mask = make_sky_mask(src_image, border, 0)
# 扣取天空图像和地面图像
sky_image_ma = np.ma.array(src_image, mask = cv2.cvtColor(sky_mask, cv2.COLOR_GRAY2BGR))
ground_image_ma = np.ma.array(src_image, mask = cv2.cvtColor(ground_mask, cv2.COLOR_GRAY2BGR))
# 计算天空和地面图像协方差矩阵
sky_image = sky_image_ma.compressed()
ground_image = ground_image_ma.compressed()
sky_image.shape = (sky_image.size//3, 3)
ground_image.shape = (ground_image.size//3, 3)
sky_covar, sky_mean = cv2.calcCovarMatrix(sky_image, mean=None, flags=cv2.COVAR_ROWS|cv2.COVAR_NORMAL|cv2.COVAR_SCALE)
sky_retval, sky_eig_val, sky_eig_vec = cv2.eigen(sky_covar)
ground_covar, ground_mean = cv2.calcCovarMatrix(ground_image, mean=None,flags=cv2.COVAR_ROWS|cv2.COVAR_NORMAL|cv2.COVAR_SCALE)
ground_retval, ground_eig_val, ground_eig_vec = cv2.eigen(ground_covar)
gamma = 2 # 论文原始参数
sky_det = cv2.determinant(sky_covar)
#sky_eig_det = cv2.determinant(sky_eig_vec)
ground_det = cv2.determinant(ground_covar)
#ground_eig_det = cv2.determinant(ground_eig_vec)
sky_energy = 1 / ((gamma * sky_det + ground_det) + (gamma * sky_eig_val[0,0] + ground_eig_val[0,0]))
return sky_energy
def calcJm(img, H):
h, w, c = img.shape
skysample = np.zeros((sum(H), 3))
gndsample = np.zeros((w * h - sum(H), 3))
ks = 0
kg = 0
for x in range(w):
for y in range(H[x]):
skysample[ks, 0] = img[y, x, 0]
skysample[ks, 1] = img[y, x, 1]
skysample[ks, 2] = img[y, x, 2]
ks = ks + 1
for y in range(h - H[x]):
gndsample[kg, 0] = img[y + H[x], x, 0]
gndsample[kg, 1] = img[y + H[x], x, 1]
gndsample[kg, 2] = img[y + H[x], x, 2]
kg = kg + 1
skycov, skymean = cv2.calcCovarMatrix(skysample,
cv2.COVAR_ROWS | cv2.COVAR_NORMAL)
gndcov, gndmean = cv2.calcCovarMatrix(gndsample,
cv2.COVAR_ROWS | cv2.COVAR_NORMAL)
skyret, skyeigval, skyeigvec = cv2.eigen(skycov, 1)
gndret, gndeigval, gndeigvec = cv2.eigen(gndcov, 1)
skyeigvalsum = sum(skyeigval)
gndeigvalsum = sum(gndeigval)
skydet = cv2.determinant(skycov)
gnddet = cv2.determinant(gndcov)
Jm = 1.0 / (skydet + gnddet + skyeigvalsum * skyeigvalsum +
gndeigvalsum * gndeigvalsum)
return (Jm)
def calculate_pca(contour):
# Re-organize data set (Matrix X = rowvector n x p variabels)
contour = np.reshape(contour, (contour.shape[0], contour.shape[2]))
# Calculate d-dimensional empirical mean vector
mean_x = np.mean(contour[:, 0])
mean_y = np.mean(contour[:, 1])
mean_vec = np.array([[mean_x], [mean_y]]).reshape(1, -1)
# Calculate deviations from mean
mean_dev = []
for row in contour:
mean_dev.append(row - mean_vec)
mean_dev = np.asarray(mean_dev)
mean_dev = np.reshape(mean_dev, (mean_dev.shape[0], mean_dev.shape[2]))
# Get the covariance matrix
cov_mat = np.cov([mean_dev[:, 0], mean_dev[:, 1]])
# Find eigenvectors and eigenvalues of covariance matrix
mean, eigenvectors = cv2.PCACompute(cov_mat, mean_vec)
retval, eigenvalues, eigenvectors2 = cv2.eigen(cov_mat)
eig_val_cov, eig_vec_cov = np.linalg.eig(cov_mat)
# Pair vectors and values and sort desc (get biggest first)
eig_pairs = [(np.abs(eig_val_cov[i]), eig_vec_cov[:, i])
for i in range(len(eig_val_cov))]
eig_pairs.sort(key=lambda x: x[0], reverse=True)
eig_pairs = eig_pairs[0:2]
return eig_pairs, mean_vec
def task_4_a():
print("Task 4 (a) ...")
W = np.array([[0, 1, 0.2, 1, 0, 0, 0, 0], [1, 0, 0.1, 0, 1, 0, 0, 0],
[0.2, 0.1, 0, 1, 0, 1, 0.3, 0], [1, 0, 1, 0, 0, 1, 0, 0],
[0, 1, 0, 0, 0, 0, 1, 1], [0, 0, 1, 1, 0, 0, 1, 0],
[0, 0, 0.3, 0, 1, 1, 0, 1], [0, 0, 0, 0, 1, 0, 1, 0]])
D_vector = np.sum(W, axis=0)
# a)
D = np.diag(D_vector)
D_sqrt = np.diag(np.sqrt(D_vector))
D_inv_sqrt = np.diag(1 / np.sqrt(D_vector))
_, eigen_values, eigen_vectors = cv.eigen(
np.dot(np.dot(D_inv_sqrt, D - W), D_inv_sqrt))
second_smallest = eigen_vectors[-2]
y = np.dot(D_sqrt, second_smallest
) # this is the generalized eigen vector of (D-W)y=lambda D y
# b)
names = np.array(['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H'])
C_1 = names[y >= 0]
C_2 = names[y < 0]
print('C_1:', C_1)
print('C_2:', C_2)
# Instead of counting the edges etc. we are using the reformulated version
normalized_cut_value = np.dot(np.dot(y, (D - W)), y) / (np.dot(
np.dot(y, W), y))
print('Normalized cut value:', normalized_cut_value)
def harrisdetector(image, k, t):
ptr_x = []
ptr_y = []
kernel = np.array([[0, 0, 0], [-1, 0, 1], [0, 0, 0]])
Ix = cv2.filter2D(image, -1, kernel)
kernel = np.array([[0, -1, 0], [0, 0, 0], [0, 1, 0]])
Iy = cv2.filter2D(image, -1, kernel)
XX = Ix * Ix
XY = Ix * Iy
YY = Iy * Iy
for i in range(image.shape[0]):
for j in range(image.shape[1]):
x1 = i - k if i - k >= 0 else 0
x2 = i + k + 1 if i + k + 1 < image.shape[0] else image.shape[0] - 1
y1 = j - k if j - k >= 0 else 0
y2 = j + k + 1 if j + k + 1 < image.shape[1] else image.shape[1] - 1
A = np.sum(XX[x1:x2, y1:y2])
B = np.sum(XY[x1:x2, y1:y2])
C = np.sum(YY[x1:x2, y1:y2])
M = np.array([[A, B], [B, C]])
eVal, eVec = cv2.eigen(M, True)[1:]
if (eVal > t).all():
ptr_x.append(j)
ptr_y.append(i)
result = [ptr_x, ptr_y]
return result
def get_max_eigenvalue_node(node: ColorNode) -> ColorNode:
if node.left is None and node.right is None:
return node
max_eigen_value = -1
# eigenvalues = np.zer
queue = deque()
queue.append(node)
output = node
while len(queue) > 0:
tmp_node: ColorNode = queue.popleft()
if tmp_node.right and tmp_node.left:
queue.append(tmp_node.right)
queue.append(tmp_node.left)
continue
retval, eigenvalues, eigenvectors = cv2.eigen(tmp_node.covariance)
if (eigenvalues[0] > max_eigen_value):
max_eigen_value = eigenvalues[0]
output = tmp_node
return output
def task_4_a():
print("Task 4 (a) ...")
start_vertex = 'A'
W = np.array([[0., 1., 0.2, 1., 0., 0., 0., 0.],
[1., 0., 0.1, 0., 1., 0., 0., 0.],
[0.2, 0.1, 0., 1., 0., 1., 0.3, 0.],
[1., 0., 1., 0., 0., 1., 0., 0.],
[0., 1., 0., 0., 0., 0., 1., 1.],
[0., 0., 1., 1., 0., 0., 1., 0.],
[0., 0., 0.3, 0., 1., 1., 0., 1.],
[0., 0., 0., 0., 1., 0., 1., 0.]]) # construct the W matrix
d = W.sum(axis=1)
D = np.diag(d)
L = D - W
D_sqrt = np.diag(np.power(d, -1. / 2.))
eigenEquation = np.dot(D_sqrt, np.dot(L, D_sqrt))
lambdas, Z = cv.eigen(eigenEquation)[1:]
eigen_value = np.amin(lambdas[lambdas != np.amin(lambdas)])
print('Second smallest eigen value: {}'.format(eigen_value))
y = Z[np.where(lambdas == eigen_value)[0]].T
y = np.dot(D_sqrt, y)
print('Corresponding eigen vector: {}'.format(y))
min_N_cut = np.dot(y.T, np.dot(L, y)) / np.dot(y.T, np.dot(D, y))
print('Minimum NCut: {}'.format(min_N_cut[0][0]))
c1 = np.where(y > 0)[0]
c2 = np.where(y < 0)[0]
cluster1, cluster2 = [], []
for i in range(len(c1)):
cluster1.append(chr(ord(start_vertex) + c1[i]))
cluster2.append(chr(ord(start_vertex) + c2[i]))
print('Vertices in cluster - 1: {}'.format(cluster1))
print('Vertices in cluster - 2: {}'.format(cluster2))
def harrisdetector(image, k, t):
# TODO Write harrisdetector function based on the illustration in specification.
# Return corner points x-coordinates in result[0] and y-coordinates in result[1]
ptr_x = []
ptr_y = []
img = image.astype('double') #(300L, 300L, 3L)
Ix = cv2.filter2D(img, -1, np.array((-1, 1)))
Iy = cv2.filter2D(img, -1, np.array(((-1, 1), )))
w = np.ones((2 * k + 1, 2 * k + 1))
Ixx = cv2.filter2D(np.multiply(Ix, Ix), -1, w) #(300L, 300L, 3L)
# print ('Ixx shape: ',np.shape(Ixx))
Ixy = cv2.filter2D(np.multiply(Ix, Iy), -1, w)
Iyy = cv2.filter2D(np.multiply(Iy, Iy), -1, w)
print 'starting to looking for the feature...\n'
for i in range(k, np.size(image, 0) - k):
for j in range(k, np.size(image, 1) - k):
_, eig, _ = cv2.eigen(
np.array(((Ixx[i, j, 0], Ixy[i, j, 0]), (Ixy[i, j,
0], Iyy[i, j,
0]))))
if all(eig > t):
ptr_x += [j]
ptr_y += [i]
result = [ptr_x, ptr_y]
return result
def _get_orientation(self, pts):
# Construct a buffer used by the PCA analysis
data_pts = np.squeeze(np.array(pts, dtype=np.float64))
# Perform PCA analysis
# https://stackoverflow.com/questions/22612828/python-opencv-pcacompute-eigenvalue
covar, mean = cv2.calcCovarMatrix(
data_pts, np.mean(data_pts, axis=0),
cv2.COVAR_SCALE | cv2.COVAR_ROWS | cv2.COVAR_SCRAMBLED)
eigenvalues, eigenvectors = cv2.eigen(covar)[1:]
eigenvectors = cv2.gemm(eigenvectors, data_pts - mean, 1, None, 0)
eigenvectors = np.apply_along_axis(
lambda n: cv2.normalize(n, dst=None).flat, 1, eigenvectors)
# Store the centre of the object
cntr = np.array([int(mean[0, 0]), int(mean[0, 1])])
self.centres.append(cntr)
# Draw the principal components
cv2.circle(self.img, (cntr[0], cntr[1]), 3, (255, 0, 255), 1)
p1 = cntr + 0.02 * eigenvectors[0] * eigenvalues[0]
p2 = cntr - 0.02 * eigenvectors[1] * eigenvalues[1]
# self._draw_axis(copy.copy(cntr), p1, (0, 255, 0), 2)
# self._draw_axis(copy.copy(cntr), p2, (255, 255, 0), 10)
return np.arctan2(eigenvectors[0, 1],
eigenvectors[0, 0]) # orientation in radians
def eccentricityCitra(kontur):
luasKontur = 0
terluasKontur = 0
indeks = 0
myu20 = 0.00
myu11 = 0.00
myu02 = 0.00
eccentricityCitra = 0.00
for i in range(len(kontur)):
luasKontur = cv2.contourArea(kontur[i], False)
if luasKontur > terluasKontur:
terluasKontur = luasKontur
indeks = i
mu = cv2.moments(kontur[indeks], False)
myu20 = myu20 + mu['mu20']
myu02 = myu02 + mu['mu02']
myu11 = myu11 + mu['mu11']
matriks = np.array([[myu20, myu11], [myu11, myu02]], dtype=np.float32)
ret, eigenv, eigenvct = cv2.eigen(matriks) # error: (-215) type == CV_32F || type == CV_64F
eigenv1 = eigenv[0, 0]
eigenv2 = eigenv[1, 0]
# Hitung eigen value
if eigenv1 >= eigenv2:
eccentricityCitra = eigenv2 / eigenv1
else:
eccentricityCitra = eigenv1 / eigenv2
return eccentricityCitra
def task_4_a():
print("Task 4 (a) ...")
# construct the D matrix
D = np.array([[2.2, 0, 0, 0, 0, 0, 0, 0], [0, 2.1, 0, 0, 0, 0, 0, 0],
[0, 0, 2.6, 0, 0, 0, 0, 0], [0, 0, 0, 3, 0, 0, 0, 0],
[0, 0, 0, 0, 3, 0, 0, 0], [0, 0, 0, 0, 0, 3, 0, 0],
[0, 0, 0, 0, 0, 0, 3, 0], [0, 0, 0, 0, 0, 0, 0, 2]])
# construct the W matrix
W = np.array([[0, 1, 0.2, 1, 0, 0, 0, 0], [1, 0, 0.1, 0, 1, 0, 0, 0],
[0.2, 0.1, 0, 1, 0, 1, 0.3, 0], [1, 0, 1, 0, 0, 1, 0, 0],
[0, 1, 0, 0, 0, 0, 1, 1], [0, 0, 1, 1, 0, 0, 1, 0],
[0, 0, 0.3, 0, 1, 1, 0, 1], [0, 0, 0, 0, 1, 0, 1, 0]])
'''
...
your code ...
...
'''
# compute D^(1/2)
D_rs_inv = np.sqrt(D)
# Get D^(-1/2)
for i in range(D_rs_inv.shape[0]):
for j in range(D_rs_inv.shape[1]):
if D_rs_inv[i][j] != 0:
D_rs_inv[i][j] = 1. / D_rs_inv[i][j]
# A = D^(-1/2) * (D-W) * D^(-1/2)
A = np.dot(D_rs_inv, np.dot(D - W, D_rs_inv))
# Get the eigen value, eigen vector of z
bool, eigenValues_z, eigenVectors_z = cv.eigen(A)
eigenVectors_y = np.dot(D_rs_inv, eigenVectors_z)
# 0 = (z1^T)(Z0) = (y1^T)D1, after print out the result, we get the vector we want
print("second smallest: " + str(eigenVectors_y[6]))
def StegerLine(img):
gray_origin = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
gray = cv2.GaussianBlur(gray_origin, (5, 5), 0)
Ix = cv2.Scharr(
gray,
cv2.CV_32F,
1,
0,
)
Iy = cv2.Scharr(gray, cv2.CV_32F, 0, 1)
Ixx = cv2.Scharr(Ix, cv2.CV_32F, 1, 0)
Ixy = cv2.Scharr(Ix, cv2.CV_32F, 0, 1)
Iyy = cv2.Scharr(Iy, cv2.CV_32F, 0, 1)
Iyx = cv2.Scharr(Iy, cv2.CV_32F, 1, 0)
# Hessian矩阵
row = gray_origin.shape[0]
col = gray_origin.shape[1]
CenterPoint = []
for i in range(col):
for j in range(row):
if gray_origin[j, i] > 200:
hessian = np.zeros((2, 2), np.float32)
hessian[0, 0] = Ixx[j, i]
hessian[0, 1] = Ixy[j, i]
hessian[1, 0] = Iyx[j, i]
hessian[1, 1] = Iyy[j, i]
ret, eigenVal, eigenVec = cv2.eigen(hessian)
lambda1 = 0.
lambda2 = 0.
nx, ny, fmaxD = 0.0, 0., 0.
if ret:
# print(eigenVal.shape,eigenVec.shape)
if np.abs(eigenVal[0, 0]) >= np.abs(eigenVal[1, 0]):
lambda1 = eigenVal[1, 0]
lambda2 = eigenVal[0, 0]
nx = eigenVec[0, 0]
ny = eigenVec[0, 1]
famxD = eigenVal[0, 0]
else:
lambda1 = eigenVal[0, 0]
lambda2 = eigenVal[1, 0]
nx = eigenVec[1, 0]
ny = eigenVec[1, 1]
famxD = eigenVal[1, 0]
#if lambda1<15 and lambda2<-50:
t = -(nx * Ix[j, i] + ny * Iy[j, i]) / (
nx * nx * Ixx[j, i] + 2 * nx * ny * Ixy[j, i] +
ny * ny * Iyy[j, i])
if np.abs(t * nx) <= 0.5 and np.abs(t * ny) <= 0.5:
#CenterPoint.append([i, j])
CenterPoint.append([i, j])
cv2.namedWindow("Steger_origin", 0)
new_img = np.zeros((row, col), np.uint8)
cv2.imshow("Steger_origin", gray_origin)
for point in CenterPoint:
cv2.circle(img, (point[0], point[1]), 1, 255)
cv2.namedWindow("res", 0)
cv2.imshow("res", img)
def computeH(M, m):
"""
计算H变换矩阵
"""
count = len(M)
dtype = M.dtype
cM = np.sum(M, 0) / count
cMs = np.array([cM], dtype=dtype).repeat(count, 0)
cm = np.sum(m, 0) / count
cms = np.array([cm], dtype=dtype).repeat(count, 0)
sM = np.sum(abs(M - cMs), 0)
sm = np.sum(abs(m - cms), 0)
if (sM < epsilon).any() or (sm < epsilon).any():
return None
sm = count / sm
sM = count / sM
invHorm = np.array([
[1 / sm[0], 0, cm[0]],
[0, 1 / sm[1], cm[1]],
[0, 0, 1],
],
dtype=dtype)
Hnorm2 = np.array([
[sM[0], 0, -cM[0] * sM[0]],
[0, sM[1], -cM[1] * sM[1]],
[0, 0, 1],
],
dtype=dtype)
LtL = np.zeros((9, 9), dtype=dtype)
for i in range(0, count):
(x, y) = (m[i] - cm) * sm
(X, Y) = (M[i] - cM) * sM
Lx = np.array([[X, Y, 1, 0, 0, 0, -x * X, -x * Y, -x]], dtype=dtype)
Ly = np.array([[0, 0, 0, X, Y, 1, -y * X, -y * Y, -y]], dtype=dtype)
LtL = LtL + Lx.transpose() @ Lx + Ly.transpose() @ Ly
LtL = cv2.completeSymm(LtL)
ok, _, V = cv2.eigen(LtL)
if not ok:
return None
H0 = V[8].reshape((3, 3))
HTemp = V[7].reshape((3, 3))
HTemp = invHorm @ H0
H0 = HTemp @ Hnorm2 * 1 / H0[2, 2]
return H0
def newRotation(strg):
# Make a rotation, given by the inclination
# of the word.
# There're some restrictions of the long words
# because the angle between the principal components
# is so small or just too big.
dst = 0
pos = []
t = cv.imread(strg, -1)
t[t == 1] = 255
t[t == 0] = 1
t[t == 255] = 0
X, Y = np.shape(t)
whole_test = np.zeros((X * 2, Y * 3))
X_1, Y_1 = np.shape(whole_test)
whole_test[X // 2:3 * X // 2, Y // 2:3 * Y // 2] = t
for i in range(X_1):
for j in range(Y_1):
if whole_test[i, j] == 1:
pos.append([np.abs(i - Y_1), j])
data = np.array(pos)
cvm = np.cov(data.T)
_, eVec = cv.eigen(cvm)[1:]
[m1, m2] = eVec[0]
angle = np.int(np.abs(np.arctan(m1 / m2) * 180 // 3.1415))
if angle < 15:
angle = 15
elif angle > 25:
angle = 25
rot_mat = cv.getRotationMatrix2D((X // 2, Y // 2), angle, 1)
dst = cv.warpAffine(t, rot_mat, (Y_1, X_1))
dst[dst == 1] = 255
dst[dst == 0] = 1
dst[dst == 255] = 0
dst.reshape(Y_1, X_1)
kernel = np.ones((2, 2))
cl2 = cv.morphologyEx(dst, cv.MORPH_CLOSE, kernel)
op2 = cv.morphologyEx(cl2, cv.MORPH_OPEN, kernel)
return op2
def calcNormEigenVals(pts):
"""
descriptor of the binary image by using eigen values
:param pts: inpoints
:return:
"""
covar, mean = cv2.calcCovarMatrix(pts,
mean=None,
flags=cv2.COVAR_NORMAL | cv2.COVAR_ROWS
| cv2.COVAR_SCALE)
ret, eVal, eVec = cv2.eigen(covar)
eSum = eVal[0] + eVal[1]
eVal1 = eVal[0] / eSum
eVal2 = eVal[1] / eSum
return eVal1, eVal2
def computeTensors(A, B, C, p1, p2):
bar = tensorsTools.Bar("Compute Tensors", A.shape[0] * A.shape[1])
T = np.zeros(A.shape, Tensor)
for i in range(A.shape[0]):
for j in range(A.shape[1]):
# create symetric matrix 2x2 [[A,C][C,B]]
tmp = np.zeros((2, 2), np.float64)
tmp[0, 0] = A[i, j]
tmp[0, 1] = C[i, j]
tmp[1, 0] = C[i, j]
tmp[1, 1] = B[i, j]
# extract eigenValues and eigenVectors to compute tensor
T[i, j] = Tensor(cv.eigen(tmp), p1, p2)
bar.next()
return T
def getLsHomography(a,b):
alen = a.shape[0]
A = np.zeros((9,9))
for i in range(alen):
l1 = np.array([a[i,0],a[i,1],1,0,0,0,-a[i,0]*b[i,0],-a[i,1]*b[i,0],-b[i,0]])
l2 = np.array([0,0,0,a[i,0],a[i,1],1,-a[i,0]*b[i,1],-a[i,1]*b[i,1],-b[i,1]])
l1 = l1.reshape(1,9)
l2 = l2.reshape(1,9)
A = A + np.dot(l1.T,l1)+np.dot(l2.T,l2)
retval,_,e_vecs = cv2.eigen(A)
if retval:
H = e_vecs[-1,:]
H = H.reshape(3,3)
H = H/H[2,2]
return H
def task_4_a():
print("Task 4 (a) ...")
vertices = 8
W = np.array([[0, 1, .2, 1, 0, 0, 0, 0], [1, 0, .1, 0, 1, 0, 0, 0],
[.2, .1, 0, 1, 0, 1, .3, 0], [1, 0, 1, 0, 0, 1, 0, 0],
[0, 1, 0, 0, 0, 0, 1, 1], [0, 0, 1, 1, 0, 0, 1, 0],
[0, 0, .3, 0, 1, 1, 0, 1], [0, 0, 0, 0, 1, 0, 1,
0]]) # construct the W matrix
D = np.zeros(shape=(vertices, vertices)) # construct the D matrix
for i in range(vertices):
D[i, i] = np.sum(W[i])
L = D - W
D_sqrt = np.sqrt(D)
D_sqrt_inv = np.linalg.inv(D_sqrt)
_, eigen_values, eigen_vectors = cv.eigen(
np.matmul(np.matmul(D_sqrt_inv, L), D_sqrt_inv))
y2 = np.dot(np.linalg.inv(D_sqrt), eigen_vectors[-2])
print(y2)
##4_b
print("Task 4 (b) ...")
characters = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']
C1 = set()
C2 = set()
for index, value in enumerate(y2):
if value < 0:
C1.add(characters[index])
else:
C2.add(characters[index])
print("Cluster 1: ", C1)
print("Cluster 2: ", C2)
weight_sum = 0
for index, weight in np.ndenumerate(W):
if characters[index[0]] in C1 and \
characters[index[1]] in C2:
weight_sum += weight
volume_1 = 0
volume_2 = 0
for index, char in enumerate(characters):
if char in C1:
volume_1 += np.sum(W[index])
else:
volume_2 += np.sum(W[index])
cost = (weight_sum) / volume_1 + (weight_sum) / volume_2
print("Cost: ", cost)
def pose(self, intrinsic, radius):
fx = intrinsic[0, 0]
fy = intrinsic[1, 1]
f = (fx + fy) / 2.0
self.Q = self.Q_2d * np.array([[1, 1, 1/f],
[1, 1, 1/f],
[1/f, 1/f, 1/(f*f)]])
ret, E, V = cv2.eigen(self.Q)
V = V.T
e1 = E[0, 0]
e2 = E[1, 0]
e3 = E[2, 0]
S1 = [+1, +1, +1, +1, -1, -1, -1, -1]
S2 = [+1, +1, -1, -1, +1, +1, -1, -1]
S3 = [+1, -1, +1, -1, +1, -1, +1, -1]
g = sqrt((e2-e3)/(e1-e3))
h = sqrt((e1-e2)/(e1-e3))
k = 0
for i in range(8):
z0 = S3[i] * (e2 * radius) / sqrt(-e1*e3)
# Rotated center vector
Tx = S2[i] * e3/e2 * h
Ty = 0.0
Tz = -S1[i] * e1/e2 * g
# Rotated normal vector
Nx = S2[i] * h
Ny = 0.0
Nz = -S1[i] * g
t = z0 * V @ np.array([Tx, Ty, Tz]) # Center of circle in CCS
n = V @ np.array([Nx, Ny, Nz]) # Normal vector unit in CCS
# identify the two possible solutions
if (t[2] > 0) and (n[2] < 0): # Check facing constrain
if k > 1:
continue
self.translations[k] = t
self.normals[k] = n
# Projection
Pc = intrinsic @ t
self.projections[k, 0] = Pc[0]/Pc[2]
self.projections[k, 1] = Pc[1]/Pc[2]
k += 1
def pca(X, numOfPca=0):
[n,m] = X.shape
print X
Pusai = X.mean(axis=0)
print Pusai
X = X - Pusai
print X
Cov = cv.mulTransposed(X, False)
print Cov
[retval, eigenvalues, eigenvectors] = cv.eigen(Cov, True)
indexes = np.argsort(-eigenvalues)
eigenvalues = eigenvalues[indexes]
eigenvectors = eigenvectors[:,indexes]
eigenvalues = eigenvalues[0:numOfPca].copy()
eigenvectors = eigenvectors[:,0:numOfPca].copy()
return [eigenvalues, eigenvectors, Pusai]
def Steger(img):
gray_origin = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
cv2.namedWindow("gray_origin", 0)
cv2.imshow("gray_origin", gray_origin)
gray = cv2.GaussianBlur(gray_origin, (5, 5), 0)
Ix = cv2.Scharr(gray, cv2.CV_32F, 1, 0)
Iy = cv2.Scharr(gray, cv2.CV_32F, 0, 1)
Ixx = cv2.Scharr(Ix, cv2.CV_32F, 1, 0)
Ixy = cv2.Scharr(Ix, cv2.CV_32F, 0, 1)
Iyy = cv2.Scharr(Iy, cv2.CV_32F, 0, 1)
Iyx = cv2.Scharr(Iy, cv2.CV_32F, 1, 0)
# Hessian矩阵
row = img.shape[0]
col = img.shape[1]
CenterPoint = []
for i in range(col):
for j in range(row):
if gray_origin[j, i] > 200:
hessian = np.zeros((2, 2), np.float32)
hessian[0, 0] = Ixx[j, i]
hessian[0, 1] = Ixy[j, i]
hessian[1, 0] = Iyx[j, i]
hessian[1, 1] = Iyy[j, i]
ret, eigenVal, eigenVec = cv2.eigen(hessian)
nx, ny, fmaxD = 0.0, 0., 0.
if ret:
#print(eigenVal.shape,eigenVec.shape)
if np.abs(eigenVal[0, 0] >= eigenVal[1, 0]):
nx = eigenVec[0, 0]
ny = eigenVec[0, 1]
famxD = eigenVal[0, 0]
else:
nx = eigenVec[1, 0]
ny = eigenVec[1, 1]
famxD = eigenVal[1, 0]
t = -(nx * Ix[j, i] + ny * Iy[j, i]) / (
nx * nx * Ixx[j, i] + 2 * nx * ny * Ixy[j, i] +
ny * ny * Iyy[j, i])
if np.abs(t * nx) <= 0.5 and np.abs(t * ny) <= 0.5:
CenterPoint.append([i, j])
cv2.namedWindow("Steger_origin", 0)
cv2.imshow("Steger_origin", img)
for point in CenterPoint:
#cv2.circle(img,(point[0],point[1]),1,(0,255,0))
img[point[1], point[0]] = (0, 255, 0)
cv2.namedWindow("res", 0)
cv2.imshow("res", img)
def get_orientation(pts, img):
sz = len(pts)
data_pts = np.empty((sz, 2), dtype=np.float64)
for i in range(data_pts.shape[0]):
data_pts[i, 0] = pts[i, 0, 0]
data_pts[i, 1] = pts[i, 0, 1]
# Perform PCA analysis
mean = np.empty(0)
# mean, eigenvectors, eigenvalues = cv2.PCACompute2(data_pts, mean)
covar, mean = cv2.calcCovarMatrix(data_pts, mean, cv2.COVAR_SCALE |
cv2.COVAR_ROWS |
cv2.COVAR_SCRAMBLED)
eVal, eVec = cv2.eigen(covar)[1:]
# Conversion + normalisation required due to 'scrambled' mode
eVec = cv2.gemm(eVec, data_pts - mean, 1, None, 0)
# apply_along_axis() slices 1D rows, but normalize() returns 4x1 vectors
eVec = np.apply_along_axis(lambda n: cv2.normalize(n, n).flat, 1, eVec)
# Store the center of the object
# cntr2 = (int(mean[0, 0]), int(mean[0, 1]))
M = cv2.moments(pts)
cX = int(M["m10"] / M["m00"])
cY = int(M["m01"] / M["m00"])
cntr = (cX, cY)
cv2.circle(img, cntr, 3, (255, 0, 255), 2)
# p1 = (cntr[0] + 0.02 * eigenvectors[0, 0] * eigenvalues[0, 0],
# cntr[1] + 0.02 * eigenvectors[0, 1] * eigenvalues[0, 0])
# p2 = (cntr[0] - 0.02 * eigenvectors[1, 0] * eigenvalues[1, 0],
# cntr[1] - 0.02 * eigenvectors[1, 1] * eigenvalues[1, 0])
p1 = (cntr[0] + 0.02 * eVec[0, 0] * eVal[0, 0],
cntr[1] + 0.02 * eVec[0, 1] * eVal[0, 0])
p2 = (cntr[0] - 0.02 * eVec[1, 0] * eVal[1, 0],
cntr[1] - 0.02 * eVec[1, 1] * eVal[1, 0])
# draw_axis(img, cntr, p1, (0, 255, 0), 1)
# draw_axis(img, cntr, p2, (255, 255, 0), 5)
# angle = atan2(eigenvectors[0, 1], eigenvectors[0, 0]) # orientation in radians
angle = atan2(eVec[0, 1], eVec[0, 0])
return angle, cntr, eVec[0, 0], eVec[0, 1], eVal[0, 0]
def compute_projection_matrix(obj, img):
A = []
for i in range(0, 10):
row1 = numpy.array([
obj[i][0], obj[i][1], obj[i][2], 1, 0, 0, 0, 0,
-img[i][0][0] * obj[i][0], -img[i][0][0] * obj[i][1],
-img[i][0][0] * obj[i][2], -img[i][0][0]
])
A.append(row1)
row2 = numpy.array([
0, 0, 0, 0, obj[i][0], obj[i][1], obj[i][2], 1,
-img[i][0][1] * obj[i][0], -img[i][0][1] * obj[i][1],
-img[i][0][1] * obj[i][2], -img[i][0][1]
])
A.append(row2)
A = numpy.asarray(A)
prod = numpy.dot(A.T, A)
ret, eigenvalues, eigenvectors = cv2.eigen(prod, True)
decompose_projection_matrix(eigenvectors)
def PCA(PCAInput):
# The following mimics PCA::operator() implementation from OpenCV's
# matmul.cpp() which is wrapped by Python cv2.PCACompute(). We can't
# use PCACompute() though as it discards the eigenvalues.
# Scrambled is faster for nVariables >> nObservations. Bitmask is 0 and
# therefore default / redundant, but included to abide by online docs.
covar, mean = cv2.calcCovarMatrix(
PCAInput, cv2.cv.CV_COVAR_SCALE | cv2.cv.CV_COVAR_ROWS
| cv2.cv.CV_COVAR_SCRAMBLED)
eVal, eVec = cv2.eigen(covar, computeEigenvectors=True)[1:]
# Conversion + normalisation required due to 'scrambled' mode
eVec = cv2.gemm(eVec, PCAInput - mean, 1, None, 0)
# apply_along_axis() slices 1D rows, but normalize() returns 4x1 vectors
eVec = np.apply_along_axis(lambda n: cv2.normalize(n).flat, 1, eVec)
return mean, eVec
def PCA(PCAInput):
# The following mimics PCA::operator() implementation from OpenCV's
# matmul.cpp() which is wrapped by Python cv2.PCACompute(). We can't
# use PCACompute() though as it discards the eigenvalues.
# Scrambled is faster for nVariables >> nObservations. Bitmask is 0 and
# therefore default / redundant, but included to abide by online docs.
covar, mean = cv2.calcCovarMatrix(PCAInput, cv2.cv.CV_COVAR_SCALE |
cv2.cv.CV_COVAR_ROWS |
cv2.cv.CV_COVAR_SCRAMBLED)
eVal, eVec = cv2.eigen(covar, computeEigenvectors=True)[1:]
# Conversion + normalisation required due to 'scrambled' mode
eVec = cv2.gemm(eVec, PCAInput - mean, 1, None, 0)
# apply_along_axis() slices 1D rows, but normalize() returns 4x1 vectors
eVec = np.apply_along_axis(lambda n: cv2.normalize(n).flat, 1, eVec)
return mean, eVec
def train(img_vec, eig_vec_num):
mean = np.mean(img_vec, 1)
# Calculate covariance matrix
pca_data = np.transpose(np.transpose(img_vec) - mean)
pca_mat = np.dot(np.transpose(pca_data), pca_data)
cov, temp_mean = cv2.calcCovarMatrix(pca_mat, mean,
cv2.COVAR_NORMAL | cv2.COVAR_ROWS)
# Eigenvectors and eigenvalues
eig_val_temp, eig_vec_temp = cv2.eigen(cov, eigenvectors=True)[1:]
eig_vec = np.dot(eig_vec_temp, np.transpose(img_vec))
eig_vec = (eig_vec - eig_vec.min()) / (eig_vec.max() - eig_vec.min())
eig_vec_mat = []
for idx in range(eig_vec_num):
eig_vec_mat.append(eig_vec[idx])
return mean, eig_vec_mat
def task_4_a():
print("Task 4 (a) ...")
print('-------------------------------------------------')
D = np.zeros((8, 8))
W = np.array((
[0, 1, 0.2, 1, 0, 0, 0, 0], # A
[1, 0, 0.1, 0, 1, 0, 0, 0], # B
[0.2, 0.1, 0, 1, 0, 1, 0.3, 0], # C
[1, 0, 1, 0, 0, 1, 0, 0], # D
[0, 1, 0, 0, 0, 0, 1, 1], # E
[0, 0, 1, 1, 0, 0, 1, 0], # F
[0, 0, 0.3, 0, 1, 1, 0, 1], # G
[0, 0, 0, 0, 1, 0, 1, 0] # H
)) # construct the W matrix
for i in range(W.shape[0]):
D[i, i] = np.sum(W[i, :]) # construct the D matrix
'''
...
your code ...
...
'''
invSqrtD = np.linalg.inv(np.sqrt(D))
L = D - W
op = np.matmul(np.matmul(invSqrtD, L), invSqrtD)
_, _, eigenVecs = cv.eigen(op)
secMinEigenVec = eigenVecs[eigenVecs.shape[1] - 2, :]
C1 = 0
C2 = 0
for i in range(secMinEigenVec.shape[0]):
if secMinEigenVec[i] < 0:
C1 += D[i, i]
else:
C2 += D[i, i]
print('Eigen Vec: ' + str(np.round(secMinEigenVec, 3)))
# Figure in pdf
minNormCut = (1 / C1 + 1 / C2) * 2.4
print('Min Norm Cut = ' + str(minNormCut))
print('=================================================')
def harrisdetector(image, k, t):
# TODO Write harrisdetector function based on the illustration in specification.
# Return corner points x-coordinates in result[0] and y-coordinates in result[1]
ptr_x = []
ptr_y = []
Im= np.zeros((image.shape[0],image.shape[1],1),dtype=np.float32)
Im[:,:,0] = image[:,:,0]*0.114+image[:,:,1]*0.587+image[:,:,2]*0.299
Im.astype(np.float)
Im = np.pad(Im, ((k, k), (k, k), (0,0)),'edge')
Weight = np.ones((2*k+1,2*k+1),dtype=np.float)/9
horrizonKer = np.array([[1.0,0.0,-1.0]],dtype=np.float)
verticalKer = np.array([[1.0],[0.0],[-1.0]])
image_Blur = cv2.filter2D(Im ,-1, Weight)
I_x = cv2.filter2D(image_Blur, -1, horrizonKer)
I_y = cv2.filter2D(image_Blur, -1, verticalKer)
I_xx = cv2.filter2D(I_x, -1, horrizonKer)
I_yy = cv2.filter2D(I_y, -1, verticalKer)
I_xy = cv2.filter2D(I_x, -1, verticalKer)
I_xx = I_xx[k : -k, k : -k]
I_yy = I_yy[k : -k, k : -k]
I_xy = I_xy[k : -k, k : -k]
for i in xrange(image.shape[0]):
for j in xrange(image.shape[1]):
A = np.zeros((2,2,1),dtype=np.float)
A[0,0,0] = I_xx[i,j]
A[0,1,0] = I_xy[i,j]
A[1,0,0] = I_xy[i,j]
A[1,1,0] = I_yy[i,j]
a,eigens,vectors = cv2.eigen(A,True)
if eigens[0,0]>t and eigens[1,0]>t:
ptr_x.append(j)
ptr_y.append(i)
result = [ptr_x, ptr_y]
return result
def calc_homography(src_points, dst_points):
iter_num = len(point_pairs)
A = np.zeros((2 * iter_num, 9))
for i, (first, second) in enumerate(zip(src_points, dst_points)):
u1 = first[0]
v1 = first[1]
u2 = second[0]
v2 = second[1]
A[2 * i, 0] = u1
A[2 * i, 1] = v1
A[2 * i, 2] = 1.
A[2 * i, 3] = 0.
A[2 * i, 4] = 0.
A[2 * i, 5] = 0.
A[2 * i, 6] = -u2 * u1
A[2 * i, 7] = -u2 * v1
A[2 * i, 8] = -u2
A[2 * i + 1, 0] = 0.
A[2 * i + 1, 1] = 0.
A[2 * i + 1, 2] = 0.
A[2 * i + 1, 3] = u1
A[2 * i + 1, 4] = v1
A[2 * i + 1, 5] = 1.
A[2 * i + 1, 6] = -v2 * u1
A[2 * i + 1, 7] = -v2 * v1
A[2 * i + 1, 8] = -v2
_, _, eigen_vecs = cv.eigen(A.T @ A)
# print(eigen_vecs[8, :])
# print(eigen_vecs)
H = eigen_vecs[8, :].reshape(3, 3)
H /= H[-1, -1]
# print(H)
return H
def LSQ(points: np.ndarray, inc_inliers: np.ndarray, threshold: float,
**kwargs) -> Tuple[np.ndarray, np.ndarray]:
masspoint = np.sum(inc_inliers, axis=0)
masspoint /= inc_inliers.shape[0]
normalized_points = inc_inliers - masspoint
avg_distance = np.average(np.linalg.norm(normalized_points, axis=1))
ratio = sqrt(3) / avg_distance
normalized_points *= ratio
A = normalized_points
_, _, eigenvecs = cv.eigen(A.T @ A)
a, b, c = eigenvecs[2, :]
d = -(a * masspoint[0] + b * masspoint[1] + c * masspoint[2])
plane = np.array([a, b, c, d])
distances_mask = distance(points, plane) < threshold
inliers = points[distances_mask]
return inliers, plane
def harrisdetector(image, k, t):
if np.size(image, 2) > 1:
image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
h = np.size(image, 0)
w = np.size(image, 1)
# padding
image = np.lib.pad(image, ((k, k), (k, k)), "edge")
# derivatives
fx = np.array([[-1,0,1],[-1,0,1],[-1,0,1]])
fy = np.array([[-1,-1,-1],[0,0,0],[1,1,1]])
Ix = cv2.filter2D(image, -1, fx)
Iy = cv2.filter2D(image, -1, fy)
Ix2 = Ix * Ix
Iy2 = Iy * Iy
IxIy = Ix * Iy
# find corners
ptr_x = []
ptr_y = []
for i in xrange(k, h + k):
for j in xrange(k, w + k):
# find A
A11 = 0
A12 = 0
A22 = 0
for u in xrange(i - k, i + k + 1):
for v in xrange(j - k, j + k + 1):
A11 += Ix2[u, v]
A12 += IxIy[u, v]
A22 += Iy2[u, v]
A = np.array([[A11, A12], [A12, A22]])
retval, eigenvalues, eigenvectors = cv2.eigen(A)
if eigenvalues[0] > t and eigenvalues[1] > t:
ptr_x.append(j - k)
ptr_y.append(i - k)
result = [ptr_x, ptr_y]
return result
def harrisdetector(image, k, t):
# TODO Write harrisdetector function based on the illustration in specification.
# Return corner points x-coordinates in result[0] and y-coordinates in result[1]
ptr_x = []
ptr_y = []
img = image.astype('double')
Ix = cv2.filter2D(img, -1, np.array((-1, 1)))
Iy = cv2.filter2D(img, -1, np.array(((-1, 1),)))
w = np.ones((2*k+1, 2*k+1))
Ixx = cv2.filter2D(np.multiply(Ix, Ix), -1, w)
Ixy = cv2.filter2D(np.multiply(Ix, Iy), -1, w)
Iyy = cv2.filter2D(np.multiply(Iy, Iy), -1, w)
for i in range(k, np.size(image, 0) - k):
for j in range(k, np.size(image, 1) - k):
_, eig, _ = cv2.eigen(np.array(((Ixx[i,j,0], Ixy[i,j,0]), (Ixy[i,j,0], Iyy[i,j,0]))))
if all(eig > t):
ptr_x += [j]
ptr_y += [i]
result = [ptr_x, ptr_y]
return result
def pca(X, nb_components=0):
'''
Do a PCA analysis on X
@param X: np.array containing the samples
shape = (nb samples, nb dimensions of each sample)
@param nb_components: the nb components we're interested in
@return: return the nb_components largest eigenvalues and eigenvectors of the covariance matrix and return the average sample
'''
[n,d] = X.shape
if (nb_components <= 0) or (nb_components>n):
nb_components = n
#calculate scrambled covariance matrix for increased performance
[covar, mean] = cv2.calcCovarMatrix(X, cv.CV_COVAR_SCALE | cv.CV_COVAR_ROWS | cv.CV_COVAR_SCRAMBLED)
#compute eigenvalues and vectors of scrambled covariance matrix
[retval,eigenvals,eigenvects] = cv2.eigen(covar, True)
#calculate the normal eigenvactors from the scrambled eigenvectors
eigenvects = cv2.gemm(eigenvects, X - mean, 1, None, 0)
eigenvects = np.apply_along_axis(lambda n: cv2.normalize(n).flat, 1, eigenvects)
# return the nb_components largest eigenvalues and eigenvectors
return [eigenvals[:n], np.transpose(eigenvects[:n]), np.transpose(mean)]
def getOrientation(pts, img):
sz = len(pts)
data_pts = np.empty((sz, 2), dtype=np.float64)
for i in range(data_pts.shape[0]):
data_pts[i,0] = pts[i,0,0]
data_pts[i,1] = pts[i,0,1]
# Perform PCA analysis
mean = np.empty((0))
mean, eigenvectors = cv2.PCACompute(data_pts, mean)
# Store the center of the object
cntr = (int(mean[0,0]), int(mean[0,1]))
cv2.circle(img, cntr, 3, (255, 0, 255), 2)
ret,eigenvalues,eigenvectors=cv2.eigen(thresh,True)
p1 = (cntr[0] + 0.02 * eigenvectors[0,0] * eigenvalues[0,0], cntr[1] + 0.02 * eigenvectors[0,1] * eigenvalues[0,0])
p2 = (cntr[0] - 0.02 * eigenvectors[1,0] * eigenvalues[1,0], cntr[1] - 0.02 * eigenvectors[1,1] * eigenvalues[1,0])
drawAxis(img, cntr, p1, (0, 255, 0), 1)
drawAxis(img, cntr, p2, (255, 255, 0), 5)
angle = atan2(eigenvectors[0,1], eigenvectors[0,0]) # orientation in radians
return angle
def LSQ_fundamental_matrix(src_points, dst_points) -> np.ndarray:
num_points = len(src_points)
A = np.empty((num_points, 9))
for ind, (src, dst) in enumerate(zip(src_points, dst_points)):
x1, y1 = src.ravel()
x2, y2 = dst.ravel()
A[ind, 0] = x1 * x2
A[ind, 1] = x2 * y1
A[ind, 2] = x2
A[ind, 3] = y2 * x1
A[ind, 4] = y2 * y1
A[ind, 5] = y2
A[ind, 6] = x1
A[ind, 7] = y1
A[ind, 8] = 1
_, _, eigen_vecs = cv.eigen(A.T @ A)
F = eigen_vecs[8, :].reshape(3, 3)
return F
def Train(path):
global m,et,wt_matrix
im = Image.open(path+"/1")
m= im.size[0] #dimensions of image
n=im.size[1]
print m,n
L=[]
lst = os.listdir(path) #dir is path of Train database
l = len(lst) #read image and append it as a column to L
for i in range(1,l+1):
path2=path + "/"+str(i)#".jpg"
im = Image.open(path2)
im2=im.save("try.jpg")
data=cv2.imread("try.jpg",0)
data=data.reshape(m*n,1)
data=np.array(data[:,0])
L.append(data)
a=np.asarray(L) #convert list to np.array
ImageVector=a.T #Transpose since list is appended as a row ..we need it as a column.
#----------------Eigen_faces------------------------------------
m=np.mean(ImageVector,axis=1) #mean about columns (axis=1 gives mean about column)
A=ImageVector-m[:,None] #Difference matrix(Unique features)
At=A.T #Transpose of Difference matrix
covar=At.dot(A) #covariance = A transpose into A
eival, eivec = cv2.eigen(covar, computeEigenvectors=True)[1:] #eigen values and vectors of covariance matrix
pri=[]
column_count=len(ImageVector[0])
t=0;
for i in range(0,column_count): #ignore eigen vectors less than threshold
if(eival[i]>1):
pri.append(eivec[:,i])
t=t+1
prim=np.asarray(pri) #convert to np.array as pri is list
primary=prim.transpose()
Eiganfaces=A.dot(primary) #to get original dataset in terms of eigen vectors
#-------------------Recognition---------------------------------
wt=[]
counter=len(Eiganfaces[0]) #number of eigen vectors in eigenfaces.
et=Eiganfaces.transpose()
for i in range(0,counter):
wt.append(et.dot(A[:,i])) #multiply a image column(A(:,i)) with every vector in (Eigenfaces)
wt1=np.asarray(wt)
wt_matrix=wt1.transpose()
print "Trained!"
return et,wt_matrix