This function is a correction and modification to findNeighbours function by Patrick Granton.
It gives the indices of valid neighbors to a pixel/voxel in a 2D/3D matrix.
Given the linear index of the pixel/voxel, the size of the 2D/3D matrix and the type of connectivity considered
(4 or 8 / 6,18 or 26 connectivity), the function gives the linear indices of the neighboring pixels/voxels within the matrix size.
Ahmed Zankoor (2021). findNeighbours (https://www.mathworks.com/matlabcentral/fileexchange/68549-findneighbours), MATLAB Central File Exchange. Retrieved .
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