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Rate-distortion optimized layered coding of high dynamic range videos

Rate-distortion optimized layered coding of high dynamic range videos
학술지명 Journal Of Visual Communication And Image Representation ISSN 1047-3203
SCI 유무 SCI(E) 게재연월 2012-08 Vol. 23 No. 6
표준화된 순위정보영향력지수 67.96 IF 1.122 Citation -

Rate-distortion optimized layered coding of high dynamic range videos
저자 Chul Lee, ChangSu Kim
초록
An efficient algorithm to compress high dynamic range (HDR) videos into layered bitstreams is proposed in this work. First, we separate an HDR video sequence into a tone-mapped low dynamic range (LDR) sequence and a ratio sequence, which represents ratios between HDR and LDR pixel values. Then, we encode the LDR and ratio sequences to maximize the rate-distortion (R–D) performance by extending the standard H.264/AVC codec. Specifically, we estimate the distortion of the HDR sequence from those of the LDR sequence and the ratio sequence, and then allocate a limited bit budget to the LDR sequence and the ratio sequence efficiently to maximize the qualities of both LDR and HDR sequences. Conventional LDR devices use only the LDR stream, whereas HDR devices reconstruct the HDR video from the LDR and ratio streams. Simulation results show that the proposed algorithm provides significantly better R-D performance than conventional HDR video coding techniques.
keyword High dynamic range video, Video coding, Rate-distortion optimization, Layered coding, H.264/AVC, Tone mapping, Backward compatibility, Human visual system

Rate-distortion optimized layered coding of high dynamic range videos
과제명 3D SLAM 기반 삼차원 환경 실시간 모델링 기술 개발
연구기관 고려대학교 연구책임자 도낙주