How can I use the GPU accelerated imdilate function for 3D logical Arrays?

Question

Nils de Koff 2017-3-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/331496-how-can-i-use-the-gpu-accelerated-imdilate-function-for-3d-logical-arrays

回答： Simão Faria 2018-3-28

At the moment I am developing a region growing algorithm in which I use the imdilate function to iterative expand the region of interest. From a performance test I noticed that I use the imdilate function numerous times during the process, which took 80% of my computational time. Therefore, I wanted to accelerate the region growing algorithm by using the graphic processing unit (GPU) for the whole process. However, the imdilate function does not support three-dimensional structuring elements for gpuArrays.

So the question is: How can I use the GPU accelerated imdilate function for 3D logical Arrays?

Example code:

A = rand(300,300,250);

B = A < 0.2;

D = imdilate(B, true(3,3,3)); % CPU method

B2 = gpuArray(B);

D2 = imdilate(B2, true(3,3,3)); % GPU method that does not work

D3 = imdilate(imdilate(imdilate(B2, true(3,1,1)), true(1,3,1)), true(1,1,3)); % second GPU method that does not work