An Adaptive Estimation Model for Propagation Errors Incurred by CD in FD-CD Transcoding

FD-CD 트랜스코딩기법에서 CD에 의한 전파 왜곡의 적응적 예측 모델

  • 김진수 (한밭대학교 정보통신컴퓨터공학부) ;
  • 김재곤 (한국전자통신연구원 방송컨텐츠연구팀)
  • Published : 2004.11.01

Abstract

Recently, FD(Frame Dropping)-CD(Coefficient Dropping) transcoding is considered mainly due to the low computational complexity and simple implementation. But, CD errors in the FD-CD transtoding scheme tend to be propagated and they have a significant effect on the qualities of decoded images. In this paper, we derive the error characteristics incurred by the CD operations and propose an effective estimation model that adaptively describes well the characteristics of propagation/accumulation errors in compressed domain. Furthermore, we apply the proposed model to distortion control achieving nearly constant distortion allocation among frames. Simulation results show that the proposed model is quite accurate in estimating the overall distortions and is effectively applied to distortion control over a range of sequences with varying scene types.