Patent ID: 6192158
Filing Date: 2001-02-20
Classification: H04L,H04N

Abstract:
An image coder for use in encoding an image for transmission over a channel, comprising:an input image source for providing an image to be encoded;a wavelet decomposition unit for dividing said image into a plurality of two dimensional frequency subbands, each of said plurality of two dimensional frequency subbands having X rows and Y columns wherein X and Y vary with each of the subbands;a phase scrambling unit for generating phase scrambled frequency subbands by modifying a phase component of each of said plurality of two dimensional frequency subbands using a one-dimension m-sequence truncated to a (X) times (Y) length; anda fixed rate trellis coded quantization (FRTCQ) unit for performing FRTCQ on said phase scrambled frequency subbands.