BLC
BLC 分析b = self.img + bl_b
r = self.img + bl_r
gb = self.img + bl_gb + beta * b / 256
gr = self.img + bl_gr + alpha * r / 256
blc_img = b
blc_img = gb
blc_img = gr
blc_img = r
bl_r,0,Black level offset of Red channel
bl_gr,0,Black level offset of Green(R) channel
bl_gb,0,Black level offset of Green(B) channel
bl_b,0,Black level offset of Blue channel
alpha,0,Fusion parameter for Red channel
beta,0,Fusion parameter for Blue channel
最后两个变量如何理解。
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