Model Parameter-based Rate Control Algorithm for Constant Quality Real-Time Video Coding

실시간 부호화를 위한 모델 파라미터 기반 일정 화질 비트율 제어 기법

  • Jeong, Jin-Woo (Department of Electrical & Electronics, Yonsei University) ;
  • Cho, Kyung-Min (Department of Electrical & Electronics, Yonsei University) ;
  • Choe, Yoon-Sik (Department of Electrical & Electronics, Yonsei University)
  • 정진우 (연세대학교 전기전자공학과) ;
  • 조경민 (연세대학교 전기전자공학과) ;
  • 최윤식 (연세대학교 전기전자공학과)
  • Published : 2008.05.25

Abstract

In this paper, we propose a rate control algorithm for constant quality real time video coding. To achieve constant quality, previous algorithm exploit mean absolute of difference(MAD) as measure of frame complexity. However, if scene is abruptly changed or if quantization parameter is not constant, encoder produces various output bits with same MAD. Therefore we know that MAD does not appropriately reflect characteristic of frame. To solve this problem, we exploit model parameter as measure of frame complexity. Because model parameter means slope between output bits and MAD, it reflects correctly complexity of frame. And because previous model, R-MAD model, is not considered quantization parameter, as quantization parameter increases or decreases, model parameter of frame also vary. So model parameter obtained using previous model cannot reflect internal characteristic of video. We solve this problem using proposed model, which is considered quantization parameter. Experiment results show that our algorithm provide better performance, in terms of quality smoothness than previous algorithm. Especially, when scene is abruptly changed, our algorithm alleviates quality drop.

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