how can I find the locations of pixels inside a selected region on an image?

I am writing to select a region on an image using roipoly tool. The outputs I am getting are BW, xi and yi. I want to find the number of pixels inside this selected region and their pixel locations. I could find the number of pixels inside the polygon by converting it to a binary image but still don't know how I can find the location of the pixels inside the region. Thanks for your help!

Answer 1

[Walter Roberson]

http://blogs.mathworks.com/steve/2007/02/24/roipoly-rectangular-regions-and-logical-indexing/