LL, (LH, HL, HH) = wavelet ValueError: too many values to unpack (expected 3)

This error occurs because the function or code is expecting three values to be returned, but it is receiving more than three values. In this case, LL, LH, HL, and HH are the four values returned by the wavelet function, but the code is only expecting three values to be returned.

To fix this error, you need to modify the code to handle all four values returned by the wavelet function, or use a different function that only returns the three values that the code is expecting.