MATLAB: How to get the pixel values for array of selected coordinates of an Image

image processing

Suppose, I have an Image I. An array of selected coordinates contains coordinates as elements less than or equal to the number of pixels in the image. How to get the pixel values for those coordinates?

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doc interp2

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MATLAB: How to get pixel coordinates

BW = roipoly(...);
[x,y] = find(BW);

MATLAB: Get the coordinates of a pixel

I'd probably first crop the image to the known region where the pattern lives. Then I'd threshold the image to find the gray boxes. Then I'd call imerode a little bit to make sure the gray boxes are separated. Then I'd find the centroids with regionprops() and say the center is at the average of the centroids.

Another method might be to call an edge detection filter to get a cross, then split the cross into two sets of points by ignoring points near the center. Then call polyfit twice and see where the equations of the lines cross using simple algebra.

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MATLAB: How to get pixel coordinates

MATLAB: Get the coordinates of a pixel

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