how to display 4 large connected components out of 20 in an image?

how to display 4 large connected components out of 20 in an image?

[MoonPie1]

As it is medical image, i am not able to use bwfilt command..

Answer 1

[Image Analyst]

There is no bwfilt() function that I've heard of. Use bwareafilt(). It does not care in the slightest where your binary image originated, like if it was from a medical image or some other image.

biggest4 = bwareafilt(binaryImage, 4);