Linear-translate constrained storage VQ for VSPIHT wavelet image compression
A new constrained storage VQ (CSVQ) structure based on linear transforms and translates of a common root codebook is proposed. The new VQ structure, named LT-CSVQ (linear translate CSVQ) acts as a building block for multistage VQ implementations (LT-CS-MSVQ), and significantly reduces storage requirements from that required in tree-multistage VQ implementations. LT-CS-MSVQ is most appropriate for medium rate multistage VQ implementations, and is applied to the previously proposed vector enhancement of Said and Pearlman's (1996) set partitioning in hierarchical trees (SPIHT) image coder named VSPIHT.