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How to get the mean value of the area around certain coordinates of an image?

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ferran parera
ferran parera 2017-4-27
评论： ferran parera 2017-5-2
Hi, I am writing a code to analize all the frames of a video. I have already split the video on its frames. To simplify my question lets take a single grey scale image.
I have an image. I have a mesh of points (with their coordinates). The mesh is a regular square mesh. I would like to get the average value in the area around each of these points. And if it is posible to have these mean values in a matrix.
How do you recomend me to do it?
Thank you in advance.
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ferran parera
ferran parera 2017-4-28
Hi, I attach the image and the mat file where the x y coordinates of each point can be found as matrix.
The area to do the average arround each point could be x-15 to x+15. And y-15 to y+15.
If you need any other infromation just ask me.
Thanks for your help.

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采纳的回答

Image Analyst
Image Analyst 2017-4-28
Use imfilter() or conv2():
kernel = ones(31); % center plus 15 to all sides.
averageImage = conv2(grayImage, kernel, 'same');

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