Remove Black pixels and averaging the pixels
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Hello,
I have image as like below.
I want to remove the black pixels in the background and find the average value for only flower containing part.
How to remove the black pixels in all the 3 channels and do the averaging?
Thank you.
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Accepted Answer
Voss
on 12 Jan 2022
This will average the non-black pixel values in each channel independently:
data = imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/861080/image.png');
[m,n,p] = size(data);
idx = find(~all(data == 0,3));
val = NaN(1,p);
for i = 1:p
val(i) = mean(data(idx+(i-1)*m*n));
end
display(val);
If you want to replace the non-black pixels with their average color calculated this way, you could do this:
new_data = data;
for i = 1:p
new_data(idx+(i-1)*m*n) = val(i);
end
figure();
subplot(2,1,1);
imshow(data);
subplot(2,1,2);
imshow(new_data);
If you need to strictly distinguish between the background and the foreground of the image (as opposed to here, where I'm going by whether or not the pixel is black only), I'm sure there are functions in the Image Processing Toolbox you can use.
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