Data Compression

Hey there /prog/, if one has two differently compressed versions of something (say, a photo) both of which are lossy, is it possible to 'combine' them in an attempt to re-create the original? If so, what techniques for doing this are available?

>>4

If you have two signals that are both replicates of an original signal with some bounded error added, you can create a new signal with tighter or equal error bounds by averaging the two signals.