Patent ID: 8218645
Filing Date: 2012-07-10
Classification: H04N

Abstract:
1. A wavelet transform encoding apparatus comprising: a wavelet transform unit for decomposing a two-dimensional signal into subbands which are multiple frequency domains; and a coefficient encoding unit for performing a grouping process and an encoding process alternately, wherein the grouping process is performed to extract three wavelet transform coefficients LH, HL and HH located spatially at the same position as a group in the order of being raster scanned within multiple high-frequency subbands belonging to the same hierarchy, and the encoding process is performed to encode the wavelet transform coefficients LH, HL and HH included in the group composed in the grouping process, and the grouping process and the encoding process are repeated alternately, wherein the coefficient encoding unit comprises: an encoding parameter calculation unit for calculating an encoding parameter for each of the wavelet transform coefficients LH, HL and HH of an encoding object based on multiple encoded vicinal wavelet transform coefficients LH, HL and HH within the multiple high-frequency subbands belonging to the same hierarchy; and a coefficient variable-length encoding unit for encoding the wavelet transform coefficients LH, HL and HH of the encoding object into a variable-length code by utilizing the encoding parameter calculated by the encoding parameter calculation unit.