グレースケール画像からのイレースイルミネーションにヒストグラムの均等化と適応を使用しましたが、ヒストグラムの均等化(scikit画像pythonライブラリを使用)が良好だった後、 mahotasでの画像変換中に何か問題が発生しました。真っ黒な写真が撮れました。どうすれば修正できますか?
- ソース画像:
- ヒストグラムの均等化と適応;
- mahotas 変換後の結果。
scikit から mahotas への変換コード:
binimg = np.array(img_adapteq, dtype=np.bool)
ソースコード:
import scipy
import numpy as np
import pymorph as pm
import mahotas as mh
from skimage import morphology
from skimage import io
from matplotlib import pyplot as plt
from skimage import data, img_as_float
from skimage import exposure
def plot_img_and_hist(img, axes, bins=256):
"""Plot an image along with its histogram and cumulative histogram.
"""
img = img_as_float(img)
ax_img, ax_hist = axes
ax_cdf = ax_hist.twinx()
# Display image
ax_img.imshow(img, cmap=plt.cm.gray)
ax_img.set_axis_off()
# Display histogram
ax_hist.hist(img.ravel(), bins=bins, histtype='step', color='black')
ax_hist.ticklabel_format(axis='y', style='scientific', scilimits=(0, 0))
ax_hist.set_xlabel('Pixel intensity')
ax_hist.set_xlim(0, 1)
ax_hist.set_yticks([])
# Display cumulative distribution
img_cdf, bins = exposure.cumulative_distribution(img, bins)
ax_cdf.plot(bins, img_cdf, 'r')
ax_cdf.set_yticks([])
return ax_img, ax_hist, ax_cdf
mhgray = mh.imread(path,0)
binimg = mhgray[:,:,0]
print(type(binimg[0][0]))
thresh = mh.otsu(binimg)
gray =( binimg< thresh)
shape = list(gray.shape)
w = 0
if (shape[0] > shape[1]):
shape = shape[0]
else:
shape = shape[1]
if (shape < 100):
w = int((shape/100 )*1.5)
elif(shape > 100 and shape <420):
w = int((shape/100 )*2.5)
else:
w = int((shape/100)*4)
disk7 = pm.sedisk(w)
img = binimg
# Contrast stretching
p2 = np.percentile(img, 2)
p98 = np.percentile(img, 98)
img_rescale = exposure.rescale_intensity(img, in_range=(p2, p98))
# Equalization
img_eq = exposure.equalize_hist(img)
# Adaptive Equalization
img_adapteq = exposure.equalize_adapthist(img, clip_limit=0.03)
# Display results
f, axes = plt.subplots(2, 4, figsize=(8, 4))
ax_img, ax_hist, ax_cdf = plot_img_and_hist(img, axes[:, 0])
ax_img.set_title('Low contrast image')
y_min, y_max = ax_hist.get_ylim()
ax_hist.set_ylabel('Number of pixels')
ax_hist.set_yticks(np.linspace(0, y_max, 5))
ax_img, ax_hist, ax_cdf = plot_img_and_hist(img_rescale, axes[:, 1])
ax_img.set_title('Contrast stretching')
ax_img, ax_hist, ax_cdf = plot_img_and_hist(img_eq, axes[:, 2])
ax_img.set_title('Histogram equalization')
ax_img, ax_hist, ax_cdf = plot_img_and_hist(img_adapteq, axes[:, 3])
ax_img.set_title('Adaptive equalization')
ax_cdf.set_ylabel('Fraction of total intensity')
ax_cdf.set_yticks(np.linspace(0, 1, 5))
# prevent overlap of y-axis labels
plt.subplots_adjust(wspace=0.4)
plt.show()
plt.gray()
plt.subplot(121)
plt.title("after histo")
plt.imshow(img_adapteq)
plt.show()
binimg = np.array(img_adapteq, dtype=np.bool)#uint16
plt.gray()
plt.subplot(121)
plt.title("after otsu")
plt.imshow(binimg)
plt.show()
imgbnbin = mh.morph.dilate(binimg, disk7)
#2
plt.gray()
plt.subplot(121)
plt.title("after dilate before close")
plt.imshow(imgbnbin)
plt.show()
imgbnbin = mh.morph.close(imgbnbin, disk7)
#2
plt.gray()
plt.subplot(121)
plt.title("before skeletonize")
plt.imshow(imgbnbin)
plt.show()
imgbnbin = mh.morph.close(imgbnbin, disk7)
out = morphology.skeletonize(imgbnbin>0)