MATLAB Answers

finding a region of interest

Asked by Itzik Ben Shabat on 6 Nov 2012

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


1 Answer

Answer by Image Analyst
on 6 Nov 2012
 Accepted answer

See code in my comment here to find out if rectangles overlap.


Itzik Ben Shabat on 7 Nov 2012

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 on 7 Nov 2012

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

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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