Why is reversing the transform hard ? It's just about computing back values by following the transform definition, it should be even easier than doing the original transform.
Unless the hard part is doing that
1. Fast
2. with Discrete values
3. inverse discrete transform( discrete transform( discrete values ) ) should be almost equal to discrete values with high accuracy
Unless the hard part is doing that
1. Fast
2. with Discrete values
3. inverse discrete transform( discrete transform( discrete values ) ) should be almost equal to discrete values with high accuracy
is that right ?