Patent ID: 7450770
Filing Date: 2008-11-11
Classification: H04N

Abstract:
1. A coding method processing a discrete wavelet transform (DWT) coefficient having a plurality of bit-planes in parallel at a time to provide coding information for further coding process, comprising the steps of: (a) acquiring a target coefficient and neighboring coefficients around said target coefficient; (b) assigning a first contribution to each bit-plane of said target and said neighboring coefficients in respect to the location of their most significant bits (MSBs) and determining coding pass of each bit-plane of said target coefficient by its location of MSB and said contributions of said neighboring coefficients; (c) calculating first group of state variables of every bit-plane of said target and neighboring coefficients in respect to the location of their MSBs; (d) assigning a second contribution to each bit-plane of said neighboring coefficients according to said first group of state variables and coding pass and determining magnitude coding information obtained through a first predefined table using said contributions as references; (e) calculating second group of state variables of said neighboring coefficients according to said first group of state variables; (f) assigning a third contribution to neighboring coefficients according to said second group of state variables and determining sign coding information obtained through a second predefined table using said contributions as references.