清空筛选条件
清空筛选条件

removing the pixels with different size and unregular shape

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sedigheh pagheh
sedigheh pagheh 2022-7-26
评论： sedigheh pagheh 2022-7-27
Hi everyone
I want to delete some pixels in my binary image and keep some others. I have tried but the solutions like defining structuring element did not work.
I would be grateful if you could help me or share your ideas about the possible solutions.
The image and a screenshot with the marked wanting pixels is attached

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Image Analyst
Image Analyst 2022-7-27
Out of all the blobs in the image, why those specific 3? What's different about those 3 blobs? Will they always be there? If so just use bwselect or simply mask out those pixels with some known template. If they change shape, size, and location then it might be better to just improve your segmentation algorithm so that they don't get created in the first place.
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Image Analyst
Image Analyst 2022-7-27
Then bwselect is what you want. You can specify a row and column and a binary image and it will extract blobs that are true at that location. Then you can use that to erase it from the binary image. Let's say you want to delete the blob that has a white pixel at row 30 and column 100. You could do
blobToErase = bwselect(binaryImage, 100, 30); % One single blob.
binaryImage(blobToErase) = false; % Remove that blob from the image.

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Chunru
Chunru 2022-7-27
Ran in:
A simple approach is to find the regions you want to deleted (assign 0). Four your question, rectangle regions are sufficient:
I = imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1078370/image.jpg');
subplot(121); imshow(I);
xline([60 220 1180 1380], 'r')
yline([1050 1380 1940 2300], 'r')
I(1050:1380, 60:220) = 0;
I(1940:2300, 1180:1380)=0;
subplot(122); imshow(I)
xline([60 220 1180 1380], 'r')
yline([1050 1380 1940 2300], 'r')
% mode(I(:))

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