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Method of Rate Control for Multi-Pass MPEG Variable Bit Rate Coding

IP.com Disclosure Number: IPCOM000014939D
Original Publication Date: 2002-Jan-29
Included in the Prior Art Database: 2003-Jun-20

Publishing Venue

IBM

Abstract

Method of Rate Control for Multi-Pass MPEG Variable Bit Rate Coding Ligang Lu, Cesar A. Gonzales, and Jack Kouloheris What is disclosed is a new rate control algorithm for MPEG multi-pass VBR coding. The primary purpose of the first coding pass in a multiple pass coding scheme is to obtain statistical information of the source so that appropriate coding parameters can be chosen for better picture quality in the later passes. In our method, we gather statistical data for each picture P(k) in the first pass. The two most important statistics collected are the bit count B(1,k) and the average quantization scale Q(1,k) which are used to estimate the parameter of the bit production model or the picture complexity C(k). The other statistics, such as the spatial activity and the temporal activity, may also be obtained for scene change and fading detection. In the following we first introduce a more accurate picture coding complexity estimate. 1. A More Accurate Picture Coding Complexity Estimate