Transform coding with backward adaptive updates
The Karhunen-Loeve transform (KLT) is optimal for transform coding of a Gaussian source. This is established for all stale-invariant quantizers, generalizing previous results. A backward adaptive technique for combating the data dependence of the KLT is proposed and analyzed, When the adapted transform converges to a KLT, the scheme is universal among transform coders. A variety of convergence results are proven.
transform coding dithered quantization lossy data compression universal source coding