how to remove black margines automatically from images?
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how can i automatically remove black margines around border of an image,like the dark lines remains around an image when you scan it,there is also this link which describes about this,but can any one gives a better code,thanx http://uk.mathworks.com/matlabcentral/answers/128133-automatically-trim-remove-crop-black-borders-margins-from-images-volumes i also used imclearborder,but it wont work on my image,
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Accepted Answer
Image Analyst
on 30 Jan 2015
I'm not sure why that is a problem. Just find the first and last column and crop like I suggested:
horizontalProfile = mean(grayImage, 1) > 10; % Or whatever.
firstColumn = find(horizontalProfile, 1, 'first');
lastColumn = = find(horizontalProfile, 1, 'last');
subImage = grayImage(:, firstColumn, lastColumn);
Is there a problem with that? I think it should handle the cases you mentioned. Does it not?
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Image Analyst
on 4 Jan 2020
Oh, sorry - I didn't read closely enough, or I misinterpreted.
To get the bounding box of everything, here is one way
[r, c] = find(binaryImage);
row1 = min(r);
row2 = max(r);
col1 = min(c);
col2 = max(c);
croppedImage = grayImage(row1:row2, col1:col2);
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