Patent ID: 7715480
Filing Date: 2010-05-11
Classification: H04N

Abstract:
1. A method for encoding a video, comprising an encoder system for performing steps of the method, comprising the steps of: applying a three dimensional dual-tree discrete wavelet transform to the video to generate a plurality of three dimensional sequences of wavelet coefficients having spatial and temporal correlation; and compressing the plurality of three dimensional sequences to produce a compressed bitstream corresponding to the video, and in which the compressing further comprises: selecting iteratively the wavelet coefficients in a large to small order, in which the selecting is a noise shaping method; and entropy encoding the selected wavelet coefficient; and in which the noise shaping method further comprises: quantizing the wavelet coefficients to produce quantized wavelet coefficients; inverse transforming the quantized wavelet coefficient to a quantized video; determining an error signal between the video and the quantized video; applying the three dimensional dual-tree discrete wavelet transform to the error signal; and adding the transformed error signal, after a delay, to the quantized wavelet coefficients.