Need to remove the black background from image patches

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prashant singh
prashant singh 2016-7-8
回答： Image Analyst 2016-7-8
I have patches of an image . I want to remove those patches which only contain the black background of the image . The image is medical CT scan image of the brain. As you can see in the attachment, the original image and the patches of that image, i want to remove those patches which are only black patches i.e patches of the image background.
FYI , please ignore label of the patch.

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Image Analyst
Image Analyst 2016-7-8
Inside your loop where you're creating the subplots of the subimages, do this
for k = 1 : 121
thisImage = ....whatever....
if mean2(thisImage) < 20 % Or whatever value you want
continue;
end
subplot(......
end

更多回答（1 个）

Thorsten
Thorsten 2016-7-8
编辑：Thorsten 2016-7-8
You can detect an all-black patch P if the maximum value is 0 (in the ideal case) or below a certain threshold, say 0.1 (if the image values range from 0 to 1)
threshold = 0.1;
isblack = max(P(:)) < threshold;
And if it is black, you do not show the patch.

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