finding a region of interest

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

Answer 1

[Image Analyst]

See code in my comment here http://www.mathworks.com/matlabcentral/answers/52570#comment_108924 to find out if rectangles overlap.

[Itzik Ben Shabat]

thanks. that helps. but its not taking me all the way. I am using a GUI. is there a way to dray the rectangle interactively?

[Itzik Ben Shabat]

found it myself. with getPosition(imrect()) should do the trick. thanks

[Image Analyst]

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().