def test_inertia_tensor_2d():
image = np.zeros((40, 40))
image[15:25, 5:35] = 1 # big horizontal rectangle (aligned with axis 1)
T = inertia_tensor(image)
assert T[0, 0] > T[1, 1]
np.testing.assert_allclose(T[0, 1], 0)
v0, v1 = inertia_tensor_eigvals(image, T=T)
np.testing.assert_allclose(np.sqrt(v0/v1), 3, rtol=0.01, atol=0.05)
def test_inertia_tensor_2d():
image = np.zeros((40, 40))
image[15:25, 5:35] = 1 # big horizontal rectangle (aligned with axis 1)
T = inertia_tensor(image)
assert T[0, 0] > T[1, 1]
np.testing.assert_allclose(T[0, 1], 0)
v0, v1 = inertia_tensor_eigvals(image, T=T)
np.testing.assert_allclose(np.sqrt(v0/v1), 3, rtol=0.01, atol=0.05)
def test_inertia_tensor_eigvals():
# Floating point precision problems could make a positive
# semidefinite matrix have an eigenvalue that is very slightly
# negative. Check that we have caught and fixed this problem.
image = np.array([[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1]])
# mu = np.array([[3, 0, 98], [0, 14, 0], [2, 0, 98]])
eigvals = inertia_tensor_eigvals(image=image)
assert (min(eigvals) >= 0)
def get_inertia(mask, mu=None):
"""compute inertia tensor and eigenvalues from mask, if moments are give the function is much faster"""
if mu is None:
mu = measure.moments(mask)
inertia_tensor = measure.inertia_tensor(mask, mu)
inertia_eigen = measure.inertia_tensor_eigvals(mask,
mu=mu,
T=inertia_tensor)
return inertia_tensor, inertia_eigen
def test_inertia_tensor_2d(dtype):
image = np.zeros((40, 40), dtype=dtype)
image[15:25, 5:35] = 1 # big horizontal rectangle (aligned with axis 1)
expected_dtype = _supported_float_type(image.dtype)
T = inertia_tensor(image)
assert T.dtype == expected_dtype
assert T[0, 0] > T[1, 1]
np.testing.assert_allclose(T[0, 1], 0)
v0, v1 = inertia_tensor_eigvals(image, T=T)
assert v0.dtype == expected_dtype
assert v1.dtype == expected_dtype
np.testing.assert_allclose(np.sqrt(v0 / v1), 3, rtol=0.01, atol=0.05)
def moments_features(image):
"""calculates the set of moments for each channel
Calculates the intertia tensor, intertia tensor eigenvalues, as well as
the moments of the image (https://en.wikipedia.org/wiki/Image_moment)
Parameters
----------
image : 3D array, shape (M, N, C)
The input image with multiple channels.
Returns
-------
features : dict
dictionary including percentiles, moments and sum per channel
"""
# storing the feature values
features = dict()
for ch in range(image.shape[2]):
hu_moments = moments_hu(image[:, :, ch])
for i in range(len(hu_moments)):
features["moments_hu_" + str(i + 1) + "_Ch" +
str(ch + 1)] = hu_moments[i]
inertia_tensor_calculated = inertia_tensor(image[:, :, ch]).ravel()
features["inertia_tensor_1_ch" +
str(ch + 1)] = inertia_tensor_calculated[0]
features["inertia_tensor_2_ch" +
str(ch + 1)] = inertia_tensor_calculated[1]
features["inertia_tensor_3_ch" +
str(ch + 1)] = inertia_tensor_calculated[3]
inertia_tensor_eigvalues = inertia_tensor_eigvals(image[:, :, ch])
features["inertia_tensor_eigvalues_1_ch" +
str(ch + 1)] = inertia_tensor_eigvalues[0]
features["inertia_tensor_eigvalues_2_ch" +
str(ch + 1)] = inertia_tensor_eigvalues[1]
the_moments = moments(image[:, :, ch], order=5).ravel()
for i in range(len(the_moments)):
features["moments_" + str(i + 1) + "_Ch" +
str(ch + 1)] = the_moments[i]
return features
def calculate_features(self, feature_mode, debug=False):
fruit_image = io.imread(self.path, as_gray=True)
sigma = 0.005 * fruit_image.shape[0]
filtered_fruit = filters.gaussian(fruit_image, sigma=sigma)
# Apply triangle threshold to gaussian filtered image
self.threshold = filters.threshold_triangle(filtered_fruit)
thresholded_fruit = filtered_fruit < self.threshold
fruit_central_moments = measure.moments_central(thresholded_fruit)
hu_moments = measure.moments_hu(
measure.moments_normalized(fruit_central_moments))
# We only keep relevant hu moments, that is, components 1 and 3
self.hu_moments = hu_moments[[1, 3]]
# And we apply a log transform to them
self.hu_moments = np.array([
-1 * np.sign(j) * np.log10(np.abs(j)) for j in self.hu_moments[:]
])
fruit_eigvalues = measure.inertia_tensor_eigvals(
thresholded_fruit, mu=fruit_central_moments)
self.moment_ratio = max(fruit_eigvalues) / min(fruit_eigvalues)
if feature_mode == 'hu_plus_ratio':
self.features = np.append(self.hu_moments, self.moment_ratio)
self.feature_size = 3
elif feature_mode == 'hu_only':
self.features = np.array(self.hu_moments)
self.feature_size = 2
if debug:
print("threshold: \n", self.threshold)
print("Central moments: \n", fruit_central_moments)
print("Hu moments:\n", hu_moments)
print(
"Normalized Hu moments:\n",
[-1 * np.sign(j) * np.log10(np.abs(j)) for j in hu_moments[:]])
print("Inertia tensor eigenvalues:\n", fruit_eigvalues)
print("Moment ratio:\n", self.moment_ratio)
print("Features: \n", self.features)
def main():
"""Main function"""
#===========================
#== PARSE ARGS
#===========================
logger.info("Get script args ...")
try:
args = get_args()
except Exception as ex:
logger.error("Failed to get and parse options (err=%s)", str(ex))
return 1
# - Input filelist
datalist = args.datalist
nmax = args.nmax
# - Data process options
nx = args.nx
ny = args.ny
normalize = args.normalize
scale_to_abs_max = args.scale_to_abs_max
scale_to_max = args.scale_to_max
log_transform = args.log_transform
resize = args.resize
augment = args.augment
shuffle = args.shuffle
draw = args.draw
dump_stats = args.dump_stats
dump_sample_stats = args.dump_sample_stats
dump_flags = args.dump_flags
scale = args.scale
scale_factors = []
if args.scale_factors != "":
scale_factors = [
float(x.strip()) for x in args.scale_factors.split(',')
]
standardize = args.standardize
img_means = []
img_sigmas = []
if args.img_means != "":
img_means = [float(x.strip()) for x in args.img_means.split(',')]
if args.img_sigmas != "":
img_sigmas = [float(x.strip()) for x in args.img_sigmas.split(',')]
chan_divide = args.chan_divide
chan_mins = []
if args.chan_mins != "":
chan_mins = [float(x.strip()) for x in args.chan_mins.split(',')]
erode = args.erode
erode_kernel = args.erode_kernel
outfile_stats = "stats_info.dat"
outfile_flags = "stats_flags.dat"
outfile_sample_stats = "stats_sample_info.dat"
exit_on_fault = args.exit_on_fault
skip_on_fault = args.skip_on_fault
save_fits = args.save_fits
fthr_zeros = args.fthr_zeros
#===========================
#== READ DATA
#===========================
# - Create data loader
dl = DataLoader(filename=datalist)
# - Read datalist
logger.info("Reading datalist %s ..." % datalist)
if dl.read_datalist() < 0:
logger.error("Failed to read input datalist!")
return 1
source_labels = dl.snames
nsamples = len(source_labels)
if nmax > 0 and nmax < nsamples:
nsamples = nmax
logger.info("#%d samples to be read ..." % nsamples)
# - Read data
logger.info("Running data loader ...")
data_generator = dl.data_generator(batch_size=1,
shuffle=shuffle,
resize=resize,
nx=nx,
ny=ny,
normalize=normalize,
scale_to_abs_max=scale_to_abs_max,
scale_to_max=scale_to_max,
augment=augment,
log_transform=log_transform,
scale=scale,
scale_factors=scale_factors,
standardize=standardize,
means=img_means,
sigmas=img_sigmas,
chan_divide=chan_divide,
chan_mins=chan_mins,
erode=erode,
erode_kernel=erode_kernel,
retsdata=True)
img_counter = 0
img_stats_all = []
img_flags_all = []
pixel_values_per_channels = []
while True:
try:
data, sdata = next(data_generator)
img_counter += 1
sname = sdata.sname
label = sdata.label
classid = sdata.id
logger.info("Reading image no. %d (name=%s, label=%s) ..." %
(img_counter, sname, label))
#print("data shape")
#print(data.shape)
nchannels = data.shape[3]
# - Check for NANs
has_naninf = np.any(~np.isfinite(data))
if has_naninf:
logger.warn(
"Image %d (name=%s, label=%s) has some nan/inf, check!" %
(img_counter, sname, label))
if exit_on_fault:
return 1
else:
if skip_on_fault:
break
# - Check for fraction of zeros in radio mask
cond = np.logical_and(data[0, :, :, 0] != 0,
np.isfinite(data[0, :, :, 0]))
for i in range(1, nchannels):
data_2d = data[0, :, :, i]
data_1d = data_2d[cond]
n = data_1d.size
n_zeros = np.count_nonzero(data_1d == 0)
f = n_zeros / n
if n_zeros > 0:
logger.info(
"Image %d chan %d (name=%s, label=%s): n=%d, n_zeros=%d, f=%f"
% (img_counter, i + 1, sname, label, n, n_zeros, f))
if f >= fthr_zeros:
logger.warn(
"Image %d chan %d (name=%s, label=%s) has a zero fraction %f, check!"
% (img_counter, i + 1, sname, label, f))
if skip_on_fault:
break
# - Check if channels have elements all equal
for i in range(nchannels):
data_min = np.min(data[0, :, :, i])
data_max = np.max(data[0, :, :, i])
same_values = (data_min == data_max)
if same_values:
logger.error(
"Image %d chan %d (name=%s, label=%s) has all elements equal to %f, check!"
% (img_counter, i + 1, sname, label, data_min))
if exit_on_fault:
return 1
else:
if skip_on_fault:
break
# - Check correct norm
if normalize:
data_min = np.min(data[0, :, :, :])
data_max = np.max(data[0, :, :, :])
if scale_to_max:
correct_norm = (data_max == 1)
else:
correct_norm = (data_min == 0 and data_max == 1)
if not correct_norm:
logger.error(
"Image %d chan %d (name=%s, label=%s) has invalid norm (%f,%f), check!"
%
(img_counter, i + 1, sname, label, data_min, data_max))
if exit_on_fault:
return 1
else:
if skip_on_fault:
break
# - Dump image flags
if dump_flags:
img_flags = [sname]
for i in range(nchannels):
##cond_i= np.logical_and(data[0,:,:,i]!=0, np.isfinite(data[0,:,:,i]))
data_2d = data[0, :, :, i]
data_1d = data_2d[cond] # pixel in radio mask
n = data_1d.size
n_bad = np.count_nonzero(
np.logical_or(~np.isfinite(data_1d), data_1d == 0))
n_neg = np.count_nonzero(data_1d < 0)
f_bad = float(n_bad) / float(n)
f_negative = float(n_neg) / float(n)
data_min = np.nanmin(data_1d)
data_max = np.nanmax(data_1d)
same_values = int(data_min == data_max)
img_flags.append(same_values)
img_flags.append(f_bad)
img_flags.append(f_negative)
# - Compute peaks & aspect ratio of first channel
kernsize = 7
footprint = np.ones((kernsize, ) * data[0, :, :, i].ndim,
dtype=bool)
peaks = peak_local_max(np.copy(data[0, :, :, i]),
footprint=footprint,
min_distance=4,
exclude_border=True)
bmap = cond.astype(np.uint8)
polygon = None
try:
contours = cv2.findContours(np.copy(bmap),
cv2.RETR_EXTERNAL,
cv2.CHAIN_APPROX_SIMPLE)
contours = imutils.grab_contours(contours)
if len(contours) > 0:
contour = np.squeeze(contours[0])
polygon = Polygon(contour)
except Exception as e:
logger.warn("Failed to compute mask contour (err=%s)!" %
(str(e)))
if polygon is None:
peaks_sel = peaks
else:
peaks_sel = []
for peak in peaks:
point = Point(peak[1], peak[0])
has_peak = polygon.contains(point)
if has_peak:
peaks_sel.append(peak)
npeaks = len(peaks_sel)
eigvals = inertia_tensor_eigvals(image=data_2d)
aspect_ratio = eigvals[0] / eigvals[1]
img_flags.append(npeaks)
img_flags.append(aspect_ratio)
img_flags.append(classid)
img_flags_all.append(img_flags)
# - Dump image stats
if dump_stats:
img_stats = [sname]
for i in range(nchannels):
data_masked = np.ma.masked_equal(data[0, :, :, i],
0.0,
copy=False)
data_min = data_masked.min()
data_max = data_masked.max()
data_mean = data_masked.mean()
data_std = data_masked.std()
img_stats.append(data_min)
img_stats.append(data_max)
img_stats.append(data_mean)
img_stats.append(data_std)
img_stats.append(classid)
img_stats_all.append(img_stats)
# - Dump sample image stats
if dump_sample_stats:
if not pixel_values_per_channels:
pixel_values_per_channels = [[] for i in range(nchannels)]
for i in range(nchannels):
cond = np.logical_and(data[0, :, :, i] != 0,
np.isfinite(data[0, :, :, i]))
data_masked_1d = data[0, :, :, i][cond]
data_masked_list = list(data_masked_1d)
#data_masked= np.ma.masked_equal(data[0,:,:,i], 0.0, copy=False)
#data_masked_list= data_masked[~data_masked.mask].tolist() # Extract non-masked values and put to list
#print("type(data_masked_list)")
#print(type(data_masked_list))
#print(data_masked_list)
if type(data_masked_list) != list:
logger.error(
"Collection of non-masked pixels in image %d chan %d (name=%s, label=%s) is not a list!"
% (img_counter, i + 1, sname, label))
#print(type(data_masked_list))
return 1
else:
for item in data_masked_list:
item_type = type(item)
if item_type != float and item_type != np.float and item_type != np.float32:
logger.error(
"Current pixel in collection of non-masked pixels in image %d chan %d (name=%s, label=%s) is not a float!"
% (img_counter, i + 1, sname, label))
#print("item")
#print(item)
#print("item_type")
#print(item_type)
#print(data_masked_list)
return 1
if not data_masked_list:
logger.error(
"Image %d chan %d (name=%s, label=%s) has non masked pixels!"
% (img_counter, i + 1, sname, label))
if exit_on_fault:
return 1
else:
if skip_on_fault:
break
pixel_values_per_channels[i].extend(data_masked_list)
# - Draw data
if draw:
logger.info("Drawing data ...")
fig = plt.figure(figsize=(20, 10))
for i in range(nchannels):
data_ch = data[0, :, :, i]
data_masked = np.ma.masked_equal(data_ch, 0.0, copy=False)
data_min = data_masked.min()
data_max = data_masked.max()
data_ch[data_ch == 0] = data_min
#logger.info("Reading nchan %d ..." % i+1)
plt.subplot(1, nchannels, i + 1)
plt.imshow(data_ch, origin='lower')
plt.tight_layout()
plt.show()
# - Dump fits
if save_fits:
logger.info("Writing FITS ...")
for i in range(nchannels):
outfile_fits = sname + '_id' + str(classid) + '_ch' + str(
i + 1) + '.fits'
Utils.write_fits(data[0, :, :, i], outfile_fits)
# - Stop generator
if img_counter >= nsamples:
logger.info("Sample size (%d) reached, stop generation..." %
nsamples)
break
except (GeneratorExit, KeyboardInterrupt):
logger.info("Stop loop (keyboard interrupt) ...")
break
except Exception as e:
logger.warn("Stop loop (exception catched %s) ..." % str(e))
break
# - Dump img flags
if dump_flags:
logger.info("Dumping img flag info to file %s ..." % (outfile_flags))
head = "# sname "
for i in range(nchannels):
ch = i + 1
s = 'equalPixValues_ch{i} badPixFract_ch{i} negativePixFract_ch{i} '.format(
i=ch)
head = head + s
head = head + "npeaks_ch1 aspectRatio_ch1 "
head = head + "id"
logger.info("Flag file head: %s" % (head))
# - Dump to file
Utils.write_ascii(np.array(img_flags_all), outfile_flags, head)
# - Dump img stats
if dump_stats:
logger.info("Dumping img stats info to file %s ..." % (outfile_stats))
head = "# sname "
for i in range(nchannels):
ch = i + 1
s = 'min_ch{i} max_ch{i} mean_ch{i} std_ch{i} '.format(i=ch)
head = head + s
head = head + "id"
logger.info("Stats file head: %s" % (head))
# - Dump to file
Utils.write_ascii(np.array(img_stats_all), outfile_stats, head)
# - Dump sample pixel stats
if dump_sample_stats:
logger.info("Computing sample pixel stats ...")
img_sample_stats = [[]]
for i in range(len(pixel_values_per_channels)):
#print("type(pixel_values_per_channels)")
#print(type(pixel_values_per_channels))
#print("type(pixel_values_per_channels[i])")
#print(type(pixel_values_per_channels[i]))
#print(pixel_values_per_channels[i])
#print("len(pixel_values_per_channels[i])")
#print(len(pixel_values_per_channels[i]))
for j in range(len(pixel_values_per_channels[i])):
item = pixel_values_per_channels[i][j]
item_type = type(item)
if item_type != np.float32 and item_type != np.float and item_type != float:
logger.error("Pixel no. %d not float (ch=%d)!" %
(j + 1, i + 1))
#print("item_type")
#print(item_type)
#print("item")
#print(item)
return 1
data = np.array(pixel_values_per_channels[i], dtype=np.float)
#print("type(data)")
#print(type(data))
data_min = data.min()
data_max = data.max()
data_mean = data.mean()
data_std = data.std()
data_median = np.median(data)
data_q3, data_q1 = np.percentile(data, [75, 25])
data_iqr = data_q3 - data_q1
img_sample_stats[0].append(data_min)
img_sample_stats[0].append(data_max)
img_sample_stats[0].append(data_mean)
img_sample_stats[0].append(data_std)
img_sample_stats[0].append(data_median)
img_sample_stats[0].append(data_iqr)
logger.info("Dumping pixel sample stats info to file %s ..." %
(outfile_sample_stats))
head = "# "
for i in range(len(pixel_values_per_channels)):
ch = i + 1
s = 'min_ch{i} max_ch{i} mean_ch{i} std_ch{i} median_ch{i} iqr_ch{i} '.format(
i=ch)
head = head + s
logger.info("Sample stats file head: %s" % (head))
Utils.write_ascii(np.array(img_sample_stats), outfile_sample_stats,
head)
return 0
