3d edge detection in matlab

To perform 3D edge detection in MATLAB, we can use the edge function from the Image Processing Toolbox. Here's an example code snippet to detect edges in a 3D volume:

main.m
% read in 3D volume
vol = imread3D('volume.nii');

% apply edge detection with Sobel filter
vol_edge = edge(vol, 'Sobel');

% display original and edge-detected volumes side by side
montage({vol, vol_edge}, 'Size', [1 2]);
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In this example, we first load in a 3D volume (in this case, from a NIfTI file using a custom imread3D function). We then apply the edge function with the Sobel filter to detect edges in the volume. Finally, we display the original and edge-detected volumes side by side using the montage function.

Note that in 3D edge detection, we are detecting edges not just in the x and y directions, but also in the z direction along the depth of the volume. Therefore, the resulting vol_edge variable will also be a 3D volume with binary values indicating the presence or absence of edges in each voxel.