how to extract a region of white pixel bounded by black pixel from white background

Answer 1

[Image Analyst]

It looks like a binary image. If it is, call imclearborder

binaryImage = imclearborder(binaryImage);

This will get rid of all white/1/true regions touching the edge of the image.

[bushra mughal]

it is not working coz blak region inside white object is hole.region of interst appear as hole how I extract it

[Image Analyst]

When you say that you want to "extract a region of white pixel bounded by black pixel" I'm assuming that you want to get rid of the white surrounding region that is touching the border. To do that you use imclearborder. I show proof with the attached m-file and this image that is creates. So explain why you said it's "not working" because the white blob is surrounded by black.

[bushra mughal]

it is working now thanks image analyst