Change corners from image

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Iugo
Iugo 2021-6-22
评论： Iugo 2021-6-22
Hello everyone!
I have this figure I'm working on, shown below, and I want to remove those upper and below left black corners or even change them from black to white, but I'm not finding any solution...
Also, since I'm dealing with different versions of this image (rotated, different sizes, I wanted to make this process as general as possible. Anyone has any idea?
Thanks!

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Walter Roberson
Walter Roberson 2021-6-22
Ran in:
img = imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/661015/image.png');
imshow(img);
title('original RGB')
BW = imbinarize(rgb2gray(img));
imshow(BW)
title('binary');
mask = ~bwareafilt(~BW, 1);
imshow(mask)
title('mask with cleared boundary')

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