Simon, It turns out that using OpenCV.jl with OpenCL support is actually remarkably easy thanks to the transparent T-API of OpenCV 3.0. All that is needed is to use cv::UMat in place of cv::Mat (and an extra header file in OpenCV.jl).
A comparison of a simple RGB to gray conversion with CPU vs. GPU Mat suggest at least 10x improvement (even with a mediocre GTX-Force 330M 512MB, CC 1.2): Declare the Mat and UMat (1000x1000 RGB) source and initialize target images julia> srcMat = Mat(1000, 1000, CV_8UC3, cvScalar(0, 255, 0)); julia> srcUMat = UMat(1000, 1000, CV_8UC3, cvScalar(0, 255, 0)); julia> dstMat = Mat() julia> dstUMat = UMat() *CPU* julia> @time(cvtColor(srcMat, dstMat, COLOR_BGR2GRAY)) elapsed time: 0.00164426 seconds (80 bytes allocated) elapsed time: 0.001682741 seconds (80 bytes allocated) elapsed time: 0.002086002 seconds (80 bytes allocated) elapsed time: 0.001711169 seconds (80 bytes allocated) elapsed time: 0.001686306 seconds (80 bytes allocated) elapsed time: 0.001655958 seconds (80 bytes allocated) elapsed time: 0.001707453 seconds (80 bytes allocated) *GPU* julia> @time(cvtColor(srcUMat, dstUMat, COLOR_BGR2GRAY)) elapsed time: 0.000149589 seconds (80 bytes allocated) elapsed time: 0.000149705 seconds (80 bytes allocated) elapsed time: 0.000149575 seconds (80 bytes allocated) elapsed time: 0.000151404 seconds (80 bytes allocated) elapsed time: 0.00017067 seconds (80 bytes allocated) elapsed time: 0.000181821 seconds (80 bytes allocated) On Saturday, December 6, 2014 10:43:58 PM UTC+1, Max Suster wrote: > > > >> >> http://developer.amd.com/community/blog/2014/10/15/opencv-3-0-transparent-api-opencl-acceleration/ > > > The link above makes it sounds very promising that enabling OpenCL in > OpenCV.jl will be rather feasible (assuming no surprises along the way...). > I was first looking frantically for the module ("ocl") in my OpenCV 3.0 > folder because the (outdated) web API documentation > said that there should be such a folder. However, this is not true - it > turns out that from v3.0, the “ocl” namespace and folder are gone, > and so is the “oclMat.” To transfer data one has to use UMat. > > I will try to get this implemented soon. > > Max > > > >
