کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
529225 869638 2012 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Rate-distortion optimized layered coding of high dynamic range videos
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر چشم انداز کامپیوتر و تشخیص الگو
پیش نمایش صفحه اول مقاله
Rate-distortion optimized layered coding of high dynamic range videos
چکیده انگلیسی

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.


► We propose a compression algorithm for high dynamic range videos.
► The proposed algorithm maximizes the qualities of LDR and HDR sequences.
► The proposed algorithm outperforms the conventional techniques in the R–D sense.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Visual Communication and Image Representation - Volume 23, Issue 6, August 2012, Pages 908–923
نویسندگان
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