c++ - How to vectorize loop operating on 3 channel OpenCV Mat? -

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i'm trying improve performance in code operating on 3 channel opencv matrix. loop looks this:

unsigned char *input = (unsigned char*)(img_input.data); // 3 channel rgb unsigned char *output = (unsigned char*)(img_output.data); // 1 channel  for(int j = 0;j < img_input.rows;j++){     for(int = 0;i < img_input.cols;i++){         unsigned char b = input[numcols * j + 3 * ] ;         unsigned char g = input[numcols * j + 3 * + 1];         unsigned char r = input[numcols * j + 3 * + 2];         output[numcols * j + i] = // operations r g , b here     } }

now gcc can't vectorise this

complicated access pattern

which isn't surprising. vectorises ok if have 2 channel, seems gcc looks multiples of 2 in loop index increment when vectorising.

question: there way vectorise loop isn't separating input matrix 3 separate matrices ?

thanks.


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