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Detect and remove T/Y joints in a binary image

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Ramin Dastanpour
Ramin Dastanpour 2015-10-1
评论： Walter Roberson 2015-10-1
I have a binary image and I want to detect and remove all pixels with >2 pixels connected to them (e.g. Y and T joints). The image is produced by thinning of the image and all lines have a thickness of 1 pixel. Below is a sample image. My first guess was to check connectivity for all pixels but since I have hundreds of these objects in each image, this approach would be too expensive. Thanks,
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Walter Roberson
Walter Roberson 2015-10-1
Should the result be to break the Y/T into three line segments?
Ramin Dastanpour
Ramin Dastanpour 2015-10-1
编辑：Ramin Dastanpour 2015-10-1
Yes, exactly. But I need to get the index of the pixel on the joint as well. After breaking the joint I want to reconnect the disconnected objects which are in one direction (more).

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Walter Roberson
Walter Roberson 2015-10-1
NewImage = BWimage;
NewImage( (conv2(0+BWImage,[1 1 1;1 0 1;1 1 1],'same') .* BWimage) > 2 ) = 0;
  1 个评论
Walter Roberson
Walter Roberson 2015-10-1
With index:
NewImage = BWImage;
idxmask = (conv2(0+BWImage,[1 1 1;1 0 1;1 1 1],'same') .* BWimage) > 2;
NewImage(idxmask) = 0;
idx = find(idxmask);

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