A VLSI architecture for a real-time code book generator and encoderof a vector quantizer

Image compression applications use vector quantization (VQ) for its high compression ratio and image quality. The current VQ hardware employs static instead of dynamic code book generation as the latter demands intensive computation and corresponding expensive hardware even though it offers better image quality. This paper describes a VLSI architecture for a real-time dynamic code book generator and encoder of 512×512 images at 30 frames/s. The four-chip 0.8 μm CMOS design implements a tree of Kohonen self-organizing maps, and consists of two VQ processors and two image buffer memory chips. The pipelined VQ processor contains a computational core for both code book generation and encoding, and is scalable to processing larger frames