rgb to ycbcr formula coefficient problem.

[BarCodeReader]

hi, I checked your image transformation part in file utils.py
the formula for rgb to ycbcr image is a little different from Wikipedia:
yours:
y = 16. + (64.738 * img[..., 0] + 129.057 * img[..., 1] + 25.064 * img[..., 2]) / 256.
wiki:
y = 16. + (65.738 * img[..., 0] + 129.057 * img[..., 1] + 25.064 * img[..., 2]) / 256.

and actually in all of your implementations, you use 64.738.
i tested both and seems this minor difference does not affect the prediction accuracy...
but still, want to point out this and make this work better.

[kyz20]

maybe an typing error, btw, did you have any color difference in you experiment?

[BarCodeReader]

maybe an typing error, btw, did you have any color difference in you experiment?

i think the error is trivial and I did not observe a significant difference in the final result.