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I have implemented a fast Gaussian-blur in C++ and compared the performance to OpenCV on Raspberry Pi 3B+ running 32bit Raspbian OS. The function uses all the 4 cores of the Raspberry Pi and works 2-3 times faster than OpenCV. The boost is even more on 64bit OS. Here is the link to code with documentation: https://github.com/zanazakaryaie/fastGaussianBlur