Selecting all pixels except one pixel
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Say that we have a 3x3 matrix. If we type x(:), this will select all the elements in the matrix, right?
How can we select all the elecments except element x(2,2)? What should we type in this case?
Thanks.
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Image Analyst
2013-5-23
What are you doing? Because if you're doing something like linear filtering via convolution or morphological filtering, you would do this be proper selection of the kernel.
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Iain
2013-5-23
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You need to use linear or logical indexing to do that. In this case, linear would be easier:
The indices for a 3x3 are:
[1 4 7;
2 5 8;
3 6 9];
So you can access it via x([1:(1 before the one you don't want) (1 after the one you don't want:end]), so for your example:
x([1:4 6:9]);
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