Patent ID: 6356663
Filing Date: 2002-03-12
Classification: G06T

Abstract:
A computer-implemented process for encoding image signals, comprising the step of encoding the image signals using an interleaved spectral-decomposition pattern in which signals corresponding to a first spectral-decomposition level are encoded in an inteleaved fashion with signals corresponding to a second spectral-decomposition level,the process comprising the steps of: (a) dividing the image into a plurality of blocks; (b) applying a transform to each of the plurality of blocks to generate a plurality of transformed blocks; and (c) encoding transformed signals corresponding to the plurality of transformed blocks following the interleaved spectral-decomposition pattern and a spatial-decomposition pattern based on at least one selected location within the image, in which signals corresponding to the selected location are encoded before signals corresponding to other locations within the image, wherein each transformed block comprises a DC coefficient and a plurality of AC coefficients and step (c) comprises the steps of: (1) encoding the DC coefficient of each transformed block; and (2) then encoding the AC coefficients of each transformed block following the interleaved spectral-decomposition pattern and the spatial-decomposition pattern, where in step (c)(2) comprises the steps of: (i) encoding a first set of bits of each of the AC coefficients following the spatial-decomposition pattern, wherein the first set of bits corresponds to the most significant bits of each of the AC coefficients; and (ii) encoding a second set of bits of each of the AC coefficients following the spatial-decomposition patterns, wherein the second set of bits corresponds to the next most significant bits of each of the AC coefficients, wherein the encoding of step (c)(2)(i) is interleaved with the encoding of step (c)(2)(ii).