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BITRATE-QUANTIZATION MODEL FOR H.264 BITSTREAM TRANSCODING
Soon-kak Kwon,Jung-Hwa Lee,Jong-Min Lee 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-
In this paper, the relation between the rate and the quantization step size is examined for transcoding in the H.264 video coding systems, the latest video compression technique. Transcoding converts the bit stream which has been quantized by a certain quantization parameter to the desired rate through re-quantization when lower rates are required. For this type of conversion, the relation between the rate and the quantization should be defined, first of all. Hereupon, this study proposes the relation regarding the H.264 encoder and verifies the validity of the model that has been proposed in the simulation.
Picture Quality Control by Priority Among Multiple Video Sources
KWON SOON-KAK,KWON OH-JUN Korea Multimedia Society 2005 멀티미디어학회논문지 Vol.8 No.6
When the multiple video sources are transmitted together through the channel of fixed bandwidth, an efficient picture quality control is necessary. This paper presents a joint picture quality control method to satisfy the user requirement by priority among the video sources. The better picture quality is assigned to the source of higher priority compared to lower priority. We obtain the bitrate for each source to have a required distortion level among the sources by using an approximate distortion-bitrate model for simple implementation. It is shown by simulation that the proposed bandwidth allocation method can keep almost the user-required picture quality among the sources in comparison to an independent bandwidth allocation method.