finding a region of interest

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Hi, I have an grayscale image matrix (basicly a 0,1 matrix). I am "drawing" a binary image using rectangle(). ( using a for loop on the matrix to identify the color and draw a each rectangle). (i know i can use imshow and enter a matrix there is a reason why im not using it). so far it works fine what i want to do next is select a region (say rectangular or circular). i want to know which of the rectangles the region is covering. is there a way to do this ? thanks

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Image Analyst
Image Analyst on 6 Nov 2012
See code in my comment here to find out if rectangles overlap.
Image Analyst
Image Analyst on 7 Nov 2012
Oh, I thought you already knew the rectangle because you said you were drawing it with rectangle(), which requires you to know the coordinates already. If you don't know them, you can use imrect(), or rbbox().

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