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Detect and count number of different pixels between two images with OpenCV Python


By : Walkyrie
Date : September 15 2020, 09:00 PM
it helps some times Similar to the question here but I'd like to return a count of the total number of different pixels between the two images. , Assuming that the size of two images is the same
code :
import  numpy as np
import cv2

im1 = cv2.imread("1.jpg")
im2 = cv2.imread("2.jpg")

# total number of different pixels between im1 and im2
np.sum(im1 != im2)


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count number of black pixels in an image in Python with OpenCV


By : Pankaj Nikam
Date : March 29 2020, 07:55 AM
it fixes the issue For black images you get the total number of pixels (rows*cols) and then subtract it from the result you get from countNonZero(mat).
For other values, you can create a mask using inRange() to return a binary mask showing all the locations of the color/label/value you want and then use countNonZero to count how many of them there are.
code :
countNonZero(img == scalar_value)  

How to detect and fix dead pixels in images using OpenCV?


By : Pawan Jaiswal
Date : March 29 2020, 07:55 AM
it fixes the issue I would suggest you to use a median filter for that purpose.
code :
155 153  2    <- Noise here on the 3rd column
148 147 146
144  0  146   <- Noise here on the 2nd column

Python / opencv: Make pixels of images be the average of nearest 4 pixels


By : lblank
Date : March 29 2020, 07:55 AM
wish of those help If you are interested in transparent numpy/indexing based solution try something like that:
I use some dummy data to test the solution:
code :
img = np.array([range(0,4), range(4, 8), range(8, 12), range(12, 16)])
[[ 0  1  2  3]
 [ 4  5  6  7]
 [ 8  9 10 11]
 [12 13 14 15]]
subimg1 = img[::2, ::2]
subimg2 = img[1::2, ::2]
subimg3 = img[::2, 1::2]
subimg4 = img[1::2, 1::2]
average = np.average([subimg1, subimg2, subimg3, subimg4], 0)
output = np.zeros(img.shape)
output[::2, ::2] = average
output[1::2, ::2] = average
output[::2, 1::2] = average
output[1::2, 1::2] = average
[[  2.5   2.5   4.5   4.5]
 [  2.5   2.5   4.5   4.5]
 [ 10.5  10.5  12.5  12.5]
 [ 10.5  10.5  12.5  12.5]]

How to count the number of pixels with a certain pixel value in python opencv?


By : Jamshid Akhmadaliev
Date : March 29 2020, 07:55 AM
it should still fix some issue To count the number of pixels with the value = [0,100,234] you can use:
code :
np.count_nonzero((img == [0, 100, 234]).all(axis = 2))

I need to count the number of black pixels in a processed video using OpenCV in python


By : we.studio
Date : March 29 2020, 07:55 AM
will be helpful for those in need The solution was to use the python standard syntax which goes like this:
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