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#define RV ( (int)(0.500*224/255*(1<<RGB2YUV_SHIFT)+0.5))
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#define RU (-(int)(0.169*224/255*(1<<RGB2YUV_SHIFT)+0.5))
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static const double rgb2yuv_table[8][9]={
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{0.7152, 0.0722, 0.2126, -0.386, 0.5, -0.115, -0.454, -0.046, 0.5},