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Cuda toolkit install. The graphics card must support cuda. (NVIDIA GTX xxx) Cmake use opencv build.

int num_device = getCudaEnabledDeviceCount(); //GPU is must num_device == 1 if(num_device > 0) Stitcher stitcher = Stitcher::createDefault(true); //try_use_gpu //use GPU else Stitcher stitcher = Stitcher::createDefault(false); //use only CPU Stitcher::Status status = stitcher.stitch(imgs, rois, pano);

it is fast.