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Editorial Team
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Asked: 2026-05-26T04:45:10+00:00

I have a label matrix of segmented image. For example, 1 1 1 2

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I have a label matrix of segmented image.
For example,

1 1 1 2 2 2 3 3 3 4 4 4

1 1 1 2 2 2 3 3 3 4 4 4

1 1 1 2 2 2 3 3 3 4 4 4

1 1 1 2 2 2 3 3 3 4 4 4

1 1 1 2 2 2 3 3 3 4 4 4

1 1 1 2 2 2 3 3 3 4 4 4

1 1 1 2 2 2 3 3 3 4 4 4

1 1 1 2 2 2 3 3 3 4 4 4

Now I would like to draw contour of each object so that the pixel value of edge of each object is 1 and other pixels value is 0.

Something like this

1 1 1 1 1 1 1 1 1 1 1 1

1 0 1 1 0 1 1 0 1 1 0 1

1 0 1 1 0 1 1 0 1 1 0 1

1 0 1 1 0 1 1 0 1 1 0 1

1 0 1 1 0 1 1 0 1 1 0 1

1 0 1 1 0 1 1 0 1 1 0 1

1 0 1 1 0 1 1 0 1 1 0 1

1 1 1 1 1 1 1 1 1 1 1 1

I hope there is a function which will do this in Matlab but I dont know.

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1 Answer

  1. Editorial Team

    Let A be your matrix, I think that this is what you’re looking for:

    (conv2(A,[1 -2 1],'same') ~=0)|(conv2(A,[1; -2; 1],'same') ~=0)

    Here’s the result with your example:

     1     1     1     1     1     1     1     1     1     1     1     1
 1     0     1     1     0     1     1     0     1     1     0     1
 1     0     1     1     0     1     1     0     1     1     0     1
 1     0     1     1     0     1     1     0     1     1     0     1
 1     0     1     1     0     1     1     0     1     1     0     1
 1     0     1     1     0     1     1     0     1     1     0     1
 1     0     1     1     0     1     1     0     1     1     0     1
 1     1     1     1     1     1     1     1     1     1     1     1
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