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how to find 41*41 patch around a keypoint in an image ?

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pankaj chouthmal
pankaj chouthmal 2014-1-26
评论： pankaj chouthmal 2014-1-27
what is patch ? how to extract 41*41 patch around a key point (x,y) in an image ?

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Image Analyst
Image Analyst 2014-1-26
patch() is a function that overlays a colored polygon over an image or a plot/graph. Sounds like you don't want or need that. You want to extract a subimage centered at row=y, column = x, like this:
subImage = grayImage(y-20:y+20, x-20:x+20);

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