Quantization based on rate-distortion modeling for cabac coders

Abstract

This disclosure describes techniques for quantizing coefficients of a video block for a video coding process that supports context-based adaptive binary arithmetic coding (CABAC). A method may comprise generating a plurality of sets of quantized coefficients for the video block, wherein each of the sets of quantized coefficients is defined based on an assumption that a particular one of the coefficients of the video block corresponds to a last non-zero coefficient of the video block, estimating a plurality of costs associated with coding the video block via the CABAC, wherein the estimated costs are based respectively on different ones of the sets of quantized coefficients, and selecting a given one of the sets of quantized coefficients associated with a lowest cost.

Description

[0001] This application claims the benefit of U.S. Provisional Application No. 61 / 019,830, filed January 8, 2008, and U.S. Provisional Application No. 61 / 030,454, filed February 21, 2008, both of which The entire contents are incorporated herein by reference. technical field

[0002] The present invention relates to digital video coding, and more particularly to quantization techniques for video coding processes supporting Context-Based Adaptive Binary Arithmetic Coding (CABAC). Background technique

[0003] Digital video capabilities can be incorporated into a wide range of devices, including digital television, digital broadcast systems, wireless broadcast systems, personal digital assistants (PDAs), laptop or desktop computers, digital cameras, digital recording devices, video games devices, video game consoles, cellular or satellite radiotelephones, and the like. Digital video devices implement video compression techniques such as MPEG-2, MPEG-4 or ITU-T H.264 / MPEG-4, P...

Images