I use your filter, but the kernel can't pass the compile, you should consider the 
"double" type in the kernel, some GPU card does not support double type
I add "#pragma OPENCL_EXTENSION cl_khr_fp64: enable " to the kernel, but it 
does not works

I will check the error tomorrow

I tested this filter on Nvidia on Linux, using driver 355 and on the Intel CPU-based OpenCL SDK so far.
Using floats potentially has an impact on the keying quality.
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