How to calculate gradient of 512*512*4 image?

Is this wrong or write?

If my output image is g(512*512*4) then gradient of g() is

gradver1=sqrt(g1(:,:,1).^2+g1(:,:,2).^2+g1(:,:,3).^2+g1(:,:,4).^2);

[Raghava S N]

Hi,

From my understanding, you are looking to calculate the gradient of a 3D image.

Refer to this link which describes how to find the gradient magnitude and direction of 3-D image using the “imgradient3” function - https://www.mathworks.com/help/images/ref/imgradient3.html.

The directional gradients of a 3-D image can be found using the “imgradientxyz” function. Refer to this link for more information - https://www.mathworks.com/help/images/ref/imgradientxyz.html.

Hope this helps!