How to make image background white?
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Jeff E on 24 Dec 2019
I would start by closing in small gaps to get a solid hand.
imgin_close = imclose(imgin, strel('square', 3));
Then I would find the overlap between that solid hand, and the inverse of the original image, leaving me with just white lines on a black background. You may have some additional noise around the edges of the hand. The could be filtered out with something like bwareaopen, depending on your application.
imgin_lines = imgin_close & ~imgin;
imgin_lines = bwareaopen(imgin_lines, 3);
I would then take the inverse of that image to get just the black lines.
imgout = ~imgin_lines;