A very fast BGRA to Grayscale conversion on Iphone « Computer Vision Talks
Almost all image processing algorithms uses gray scale images as input source. But almost all hardware video sources provide frames in RGB/BGR(A) formats. So gray scale conversion is very popular operation. Although it's expensive enough to cause CPU-bound bottlenecks while running on mobile processors. In this post i will show you how to use ARM NEON intrinsic to get significant performance boost
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Maximizing performance of CV_BGRA2GRAY conversion using NEON and cv::parallel_for « Computer Vision Talks
