This paper presents a single-pass bit allocation and rate control method for H.264. We first present an R-Q model which can estimate the frame codingcomplexity before macroblock mode selection. Based on our R-Q model,...This paper presents a single-pass bit allocation and rate control method for H.264. We first present an R-Q model which can estimate the frame codingcomplexity before macroblock mode selection. Based on our R-Q model, a single-pass slice layer rate control scheme is developed, including bit allocation of the frame layer and the slice layer. At last, to enhance our rate control scheme with greater accuracy, we propose a fine rate control method based on mode selection by optimizing the Lagrange multiplier. The experiments show that compared to JVT-E069 and JVT-G012 proposed to JVT (Joint Video Coding Expert Group), our methodcan control the bit rate more accurately and obtain a higher PSNR. When the three schemes applied to the sequence with scene changes the PSNR of this paper is improved by 0.2～0.4dB.展开更多
The new H.264 video coding standard achieves significantly higher compression performance than MPEG-2. As the MPEG-2 is popular in digital TV, DVD, etc., bandwidth or memory space can be saved by transcoding those str...The new H.264 video coding standard achieves significantly higher compression performance than MPEG-2. As the MPEG-2 is popular in digital TV, DVD, etc., bandwidth or memory space can be saved by transcoding those streams into H.264 in these applications. Unfortunately, the huge complexity keeps transcoding from being widely used in practical applications. This paper proposes an efficient transcoding architecture with a smart downscaling decoder and a fast mode decision algorithm. Using the proposed architecture, huge buffering memory space is saved and the transcoding complexity is reduced. Performance of the proposed fast mode decision algorithm is validated by experiments.展开更多
文摘This paper presents a single-pass bit allocation and rate control method for H.264. We first present an R-Q model which can estimate the frame codingcomplexity before macroblock mode selection. Based on our R-Q model, a single-pass slice layer rate control scheme is developed, including bit allocation of the frame layer and the slice layer. At last, to enhance our rate control scheme with greater accuracy, we propose a fine rate control method based on mode selection by optimizing the Lagrange multiplier. The experiments show that compared to JVT-E069 and JVT-G012 proposed to JVT (Joint Video Coding Expert Group), our methodcan control the bit rate more accurately and obtain a higher PSNR. When the three schemes applied to the sequence with scene changes the PSNR of this paper is improved by 0.2～0.4dB.
基金Project (No. CNGI-04-15-2A) supported by the China Next Gen-eration Internet (CNGI)
文摘The new H.264 video coding standard achieves significantly higher compression performance than MPEG-2. As the MPEG-2 is popular in digital TV, DVD, etc., bandwidth or memory space can be saved by transcoding those streams into H.264 in these applications. Unfortunately, the huge complexity keeps transcoding from being widely used in practical applications. This paper proposes an efficient transcoding architecture with a smart downscaling decoder and a fast mode decision algorithm. Using the proposed architecture, huge buffering memory space is saved and the transcoding complexity is reduced. Performance of the proposed fast mode decision algorithm is validated by experiments.
