How to extract second largest blob from image?

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Roark Menezes 2020-6-16

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https://ww2.mathworks.cn/matlabcentral/answers/548997-how-to-extract-second-largest-blob-from-image

编辑： KALYAN ACHARJYA 2020-6-18

I have a binary image, and have extracted the largest and second largest images from a grayscale image (using bwareafilt). This gives me the image below:

How do i extract the image on the right (the second largest image)?

Using regionprops I have the Area, Centroid and Bounding Box for both blobs, but I am not sure how to use these values to extract the image on the right.

Thank you.

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Roark Menezes 2020-6-18

How would I remove the larger image knowing just the area?

KSSV 2020-6-18

Replace that region pixel values with black ones....

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回答（1 个）

KALYAN ACHARJYA 2020-6-18

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https://ww2.mathworks.cn/matlabcentral/answers/548997-how-to-extract-second-largest-blob-from-image#answer_452973

编辑：KALYAN ACHARJYA 2020-6-18

在 MATLAB Online 中打开

large_1=bwareafilt(binary_image,1); %Extracting Large Blob
large_2=binary_image & ~large_1; % Logical Operation to get 2nd largest Blob
large_2=bwareafilt(large_2,1);  % Remove extra small blobs 
imshow(large_2);