How to get a rectangular subimage from regionprops(Image,'BoundingBox') in Matlab?

Question

I have some particles that I\'ve identified in a larger image, and need to parse into smaller images for each particle. I\'ve used the regionprops \'BoundingBox\' function,

Answer 1

The parameters returned by regionprops are [y,x,width,height] in matrix coordinates (see also "unexpected Matlab".

Thus, to extract the rectangle, you write:

subImage = I(round(s(1).BoundingBox(2):s(1).BoundingBox(2)+s(1).BoundingBox(4)),...
       round(s(1).BoundingBox(1):s(1).BoundingBox(1)+s(1).BoundingBox(3)));