EMVD
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Wrong YUVW transfer coefficient.
the YUVW transfer matrix is M = 0.5 0.5 0.5 0.5 −0.5 0.5 0.5 −0.5 0.65 0.2784 −0.2784 −0.65 −0.2784 0.65 −0.65 0.2784
but your code has cfa = np.array( [[0.5, 0.5, 0.5, 0.5], [-0.5, 0.5, 0.5, -0.5], [0.65, 0.2784, -0.2784, -0.65], [-0.2784, 0.65, -0.65, 0.2764]])