How do I get the values of the surrounding pixels when I choose a particular pixel in an image?

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I'm trying to estimate the possible points of intersection between two lines (arrays) in an image. Is there any function to return the values of the surrounding pixels for a particular value of the array?

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Image Analyst
Image Analyst am 2 Nov. 2016
Assuming it's a gray scale image, and that the row and column is not on the edge of the image:
surroundingWindow = grayImage(row-1:row+1, col-1:col+1);
If it's color:
surroundingWindow = rgbImage(row-1:row+1, col-1:col+1, :);
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