Patent ID: 6944639
Filing Date: 2005-09-13
Classification: G06T

Abstract:
1. A device for generating context vectors during encoding or decoding in a block coder of a discrete wavelet transform (DWT) codec comprising: a plurality of first digital logic gates for receiving incoming context vectors; a plurality of first context vector registers for receiving context vectors from said first digital gates; a plurality of second digital logic gates for receiving context vectors from said first context vector registers; a plurality of second context vector registers for receiving context vectors from said second digital logic gates; a plurality of third digital logic gates for receiving context vectors from said second context vector registers; a plurality of third context vector registers for receiving context vectors from said third digital logic gates; and a control unit for controlling said first, second, and third digital logic gates in order to output bits to the first, second, and third context veptor registers, respectively, based on the results of scanning a current stripe of quantized DWT coefficients; wherein each plurality of context vector registers comprises a top, center, and bottom section; and wherein the center section of said second context vector registers holds the context vectors corresponding to the current stripe of quantized DWT coefficients.