finding a region of interest

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Itzik Ben Shabat 2012-11-6

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https://ww2.mathworks.cn/matlabcentral/answers/52990-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

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Image Analyst 2012-11-6

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https://ww2.mathworks.cn/matlabcentral/answers/52990-finding-a-region-of-interest#answer_64547

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

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Itzik Ben Shabat 2012-11-7

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

Image Analyst 2012-11-7

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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