levelset segmentation example don't get right result

[feifeizuo]

when I test levelset method through LevelSetTests.cpp , I got an error segmentation result.

System:

• OS and version: Windows 10 x64.
• GPU and OpenCL vendor (NVIDIA 3090)

Screen shot as below:

[smistad]

It seems I never finished this implementation for NVIDIA devices which does not support writing directly to 3d images/textures on the GPU

[smistad]

Fixed it, but very slow: https://github.com/smistad/FAST/commit/9c8953f19703ce7a3e5e4d0f3807b87094dd222e