How do I remove blobs connected to border?

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Harrison
Harrison 2022년 11월 14일
댓글: DGM 2022년 11월 15일
I want to remove objects connected to the border of AOI (Area of interest). I'm not sure what I should do to solve this problem. I'm aware of the imclearborder() function, but this only removes objects along the border of the image itself. I want to remove the red rice shown below:
Any tips or advice would greately appreciated. Thank you!

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DGM
DGM 2022년 11월 15일
편집: DGM 2022년 11월 15일
This is one way. Use the ROI mask to connect the truncated blobs to the image border. Then you can use imclearborder().
% an image
A = imread('rice.png');
% binarize the rice somehow
mkrice = bwareaopen(A>130,100);
% create an ROI mask somehow
imshow(A);
ROI = images.roi.Polygon(gca);
ROI.Position = [88 28;41 84;36 159;140 211;228 124;220 28;141 62];
mkroi = createMask(ROI);
% show what we have
imshow([mkrice mkroi])
% combine the two and discard
mkout = imclearborder(mkrice | ~mkroi);
imshow(mkout)
  댓글 수: 4
DGM
DGM 2022년 11월 15일
It's okay. Some things get repeated so often I'm already starting to get flashbacks of similar cases myself.

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Image Analyst
Image Analyst 2022년 11월 15일
You've probably figured it out by now but I'd use bwperim and imreconstruct.
Let me know if you can't figure it out and I'll give you the solution tomorrow.

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