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Update samples/python2/hist.py

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range in calcHist() changed from [0,255] to [0,256]. Otherwise, it won't count pixels with value 255. It can be verified taking sum of histogram values and checking it with image size.
This commit is contained in:
Abid K 2013-02-19 19:31:53 +05:30
parent 39baa2237e
commit 96b2898f38
1 changed files with 2 additions and 2 deletions
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samples/python2/hist.py
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@ -27,7 +27,7 @@ def hist_curve(im):
elif im.shape[2] == 3: elif im.shape[2] == 3:
color = [ (255,0,0),(0,255,0),(0,0,255) ] color = [ (255,0,0),(0,255,0),(0,0,255) ]
for ch, col in enumerate(color): for ch, col in enumerate(color):
hist_item = cv2.calcHist([im],[ch],None,[256],[0,255]) hist_item = cv2.calcHist([im],[ch],None,[256],[0,256])
cv2.normalize(hist_item,hist_item,0,255,cv2.NORM_MINMAX) cv2.normalize(hist_item,hist_item,0,255,cv2.NORM_MINMAX)
hist=np.int32(np.around(hist_item)) hist=np.int32(np.around(hist_item))
pts = np.int32(np.column_stack((bins,hist))) pts = np.int32(np.column_stack((bins,hist)))
@ -41,7 +41,7 @@ def hist_lines(im):
print "hist_lines applicable only for grayscale images" print "hist_lines applicable only for grayscale images"
#print "so converting image to grayscale for representation" #print "so converting image to grayscale for representation"
im = cv2.cvtColor(im,cv2.COLOR_BGR2GRAY) im = cv2.cvtColor(im,cv2.COLOR_BGR2GRAY)
hist_item = cv2.calcHist([im],[0],None,[256],[0,255]) hist_item = cv2.calcHist([im],[0],None,[256],[0,256])
cv2.normalize(hist_item,hist_item,0,255,cv2.NORM_MINMAX) cv2.normalize(hist_item,hist_item,0,255,cv2.NORM_MINMAX)
hist=np.int32(np.around(hist_item)) hist=np.int32(np.around(hist_item))
for x,y in enumerate(hist): for x,y in enumerate(hist):