OpenCV:采用3通道RGB图像，分割通道，仅用R+G查看图像。

I wanted to look at only the R+G channels in an RGB image because I get better contrasts to detect an object when the Blue channel is removed. I used OpenCV to split the channels,but while merging the same after setting the blue channel to 0, my code doesn't compile.I wanted to look at only the R+G channels in an