How to Segment the ROI ?

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Piyum Rangana 2017-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/335399-how-to-segment-the-roi

回答： Image Analyst 2017-4-14

whiteMask = redChannel > 206 & greenChannel > 153 & blueChannel > 114;

consider the above code, there I am going to create a mask by considering three channels(RGB). As a result of the code I can get the ROI which has all ONEs and other regions all are zeros. If I have more than one ROIs how can I separately identify(from looping) them. Please refer the below image. The ROIs which I need to separately loop, is as below image. Basically I want to find the pixel co-ordinations of each of ROI seperatly in a loop(eg. for loop)

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Answer 1

Image Analyst 2017-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/335399-how-to-segment-the-roi#answer_263028

在 MATLAB Online 中打开

You can label the image and call ismember() in a loop. For example

[labeledImage, numberOfRegions] = bwlabel(binaryImage);
for k = 1 : numberOfRegions
    thisRegion = ismember(labeledImage, k); % Extract k'th region alone.
    imshow(thisRegion);
    pause(1); % Pause long enough to see it.
end