Preprocessing of Training Images

[rayush7]

Hi @bgshih

Is subtracting the mean and dividing by the standard deviation important preprocessing step in CRNN?

[bgshih]

@rayush7 I guess so. Unnormalized data will probably result in divergence at the beginning of training.

[rayush7]

@bgshih Could you please explain whether you used raw images from vgg synthetic dataset as an input to the crnn model or normalized them before training crnn on them?

[northeastsquare]

@rayush7 input original image , no need to normalize. in config.lua: local model = nn.Sequential() model:add(nn.Copy('torch.ByteTensor', 'torch.CudaTensor', false, true)) model:add(nn.AddConstant(-128.0)) model:add(nn.MulConstant(1.0 / 128))