I want to find the area of largest and second largest white portion/blob of a greyscale image(s) of a .dcm (dicom) file. Can someone help?

So far I've tried these two links http://www.mathworks.com/matlabcentral/answers/68696-how-can-i-extract-the-largest-blob-in-a-binary-image#comment_139454 http://www.mathworks.com/matlabcentral/answers/154484-how-can-i-calculate-area-of-an-object-in-the-image-with-png-extension The first one deals with image files and gives an error on the imhist command The second link helps to find out area of all the white portion in the greyscale, however I am only interested in the largest and second largest blobs. This link also deals with image files.

Answer 1

[Image Analyst]

Call bwareafilt() - it can give you the N largest or smallest blobs.

[Uzair Khan]

I'm using R2013. bwareafilt() was introduced in R2014. Any way I could use it in R2013? Thanks

[Image Analyst]

See the attached routine I used before bwareafilt() was introduced.