A quantized vector decoder, a method of making the code book therefor, a system for transferring quantized vector, an image processing apparatus utilizing the vector quantization, and a vector quantizer are disclosed, the quantized vector being arranged to decode codes, which have been formed...http://www.google.com.hk/patents/US5751856?utm_source=gb-gplus-share專利 US5751856 - System for processing a quantized vector using spatial frequency correlations 
