bounding box for ratio

i wanted to calculate simple bounding box ratio.

m=(a1*b1)/a+b

where

      a1=width of bounding box
      b1=height of bounding box
      a= width of image
      b=height of image.

plz help me. first time i am using bounding box..

Answer 1

[Sean de Wolski]

doc regionprops

Will give you bounding box.

doc size

Will give you image size.

[mohammed]

thanks .......

but i would like to know that, can i use rgb image instead of BW image...

[Sean de Wolski]

Well then figure out how you defined a region of interest in your rgb image, once you have this, repeat with regionprops, or just use find to find the indices and compute bounding box yourself.