Hello,
I have been using the gpu module (cuda) of OpenCV in my program for a while and it worked fine. Now I upgraded my graphics card to a gtx970. Now, the first time I call cv::gpu::GpuMat::upload after launching the program I get a very long delay. With my old graphics card (GTX770) this completed nearly instantly.
Example: I have an image which is 512x600 pixels in size. With this image it takes 12s. If I execute the same code again afterwards without closing the program it works instantaneously. I know that the first time the CUDA code is executed after launching the program, it is compiled on the GPU, so a certain delay is normal. But to me this appears to be inexplicably long, especially because it was much faster with the old card.
Does anyone know what could cause this behaviour? Are there any known issues of the current OpenCV version in connection with GTX970 cards? The version I am using is 2.4.10 which is, apart from the 3.0beta, the latest one. I compliled OpenCV with CUDA when I still had my old Graphics Card. Could compiling it again with the new one help? (I wouldn't think so)