isp 图像算法(四)之white balance gain control 就是对 r,gr,gb,b 进行加权

代码在git

[r_gain, gr_gain, gb_gain, b_gain]
Out[5]: [1.5, 1.0, 1.0, 1.1]

rgb 矩阵

gb	b
r	gr

权重矩阵

gb_gain	b_gain
r_gain	gr_gain

        for y in range(0, raw_h-1, 2):
            for x in range(0, raw_w-1, 2):
                if self.bayer_pattern == 'rggb':
                    r = self.img[y,x] * r_gain
                    gr = self.img[y,x+1] * gr_gain
                    gb = self.img[y+1,x] * gb_gain
                    b = self.img[y+1,x+1] * b_gain
                    awb_img[y,x] = r
                    awb_img[y,x+1] = gr
                    awb_img[y+1,x] = gb
                    awb_img[y+1,x+1] = b