why not subtract the mean of the image.?

[Rainyfish]

@xinntao Hi, I didn't find the operation about subtracting the mean of the image. I am confused that if the image should be normalized or not. I think it may be useful and easy to train the network with the zero mean of the input images. Looking forward to your reply. best wishes.

[xinntao]

I have tried this before. Subtracting the mean does not improve much.

So I directly use the [0,1] range for simplicity.