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H * W * 3 RGB 图像。转灰度： g = 0,299 r + 0,587 g + 0,114 b 。如何用矩阵乘积表达？
H * W * 3 RGB 图像。转灰度： g = 0,299 r + 0,587 g + 0,114 b 。如何用矩阵乘积表达？
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