SUCRA(さくら: Saitama University Cyber Repository of Academic Resources)は、埼玉大学に在籍する研究者の学術雑誌論文、紀要論文、科学研究費補助金成果報告書、学位論文、研究発表プレゼン資料などを登録し、広く世界に発信しています。 埼玉大学に在籍する皆様は、著作物をSUCRAを通じて発信することができます。詳しくは「成果物の登録方法」をご覧ください。
A new H.263+ rate control method that has very low encoder-decoder delay, small buffer and low computational complexity for hardware realization is proposed in this paper. This method focuses on producing low encoder-decoder delay in order to solve the lip synchronization problem. Low encoder-decoder delay is achieved by improving target bit rate achievement and reducing processing delay. The target bit rate achievement is improved by allocating an optimum frame encoding bits, and employing a new adaptive threshold of zero vector motion estimation. The processing delay is reduced by simplifying quantization parameter computation, applying a new non-zero coefficient distortion measure and utilizing previous frame information in current frame encoding. The simulation results indicate very large number skipped frames reduction in comparison with the test model TMN8. There were 80 skipped frames less than that of TMN8 within a 380 frame sequence during encoding of a very high movement video sequence. The 27 kbps target bit rate is achieved with insignificant difference for various types of video sequences. The simulation results also show that our method successfully allocates encoding bits, maintains small data at the encoder buffer and avoids buffer from overflow and underflow.
New Rate Control Method with Minimum Skipped Frames for Very Low Delay in H.263+ Codec
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SUCRAの概要
