Find pixel intensity with coordinates?

2020 11 5
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更新时间：2020 11 6
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I have two vector:
X[12 34 12 22]
Y[2 3 44 5]
They rappresent the coordinates (x,y) of a pixel. I want to know the intensity of each pixel and eliminate the pixel that have intensity lower than a value.

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Matt J
Matt J 2020-11-5

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pixelValues=yourImage( sub2ind(size(yourImage),X,Y) );
keep=(pixelValues>=threshold);
X=X(keep);
Y=Y(keep);

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valerio auricchio
valerio auricchio 2020-11-6
I do not understand why X=X(keep) is not taking the coordinates in the vectro x in the threshold but all value that are 1
Rik
Rik 2020-11-6
What do you mean? Are you talking about the values of the keep array itself?

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