How to extract second largest blob from image?

Roark Menezes

2020 6 16

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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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KALYAN ACHARJYA 2020-6-18

编辑：KALYAN ACHARJYA 2020-6-18

在 MATLAB Online 中打开

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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);