DEVELOPMENT OF A SOFTWARE MPEG-4 ENCODER FOR REAL-TIME APPLICATIONS
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Accession number;04A0171216
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| Title;DEVELOPMENT OF A SOFTWARE MPEG-4 ENCODER FOR REAL-TIME APPLICATIONS |
| Author;
KODAMA T
(Toshiba Corp., Kawasaki, Jpn)
MATSUMURA A
(Toshiba Corp., Kawasaki, Jpn)
YAMAGUCHI N
(Toshiba Corp., Kawasaki, Jpn)
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Journal Title;IEIC Technical Report (Institute of Electronics, Information and Communication Engineers)
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Journal Code:S0532B
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ISSN:0913-5685
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VOL.103;NO.539(IE2003 148-162);PAGE.41-45(2004)
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| Figure&Table&Reference;FIG.6, TBL.4, REF.6 |
| Pub. Country;Japan |
| Language;English |
| Abstract;A high-quality software MPEG-4 encoder for real-time applications is proposed. A low-complexity 1-pass VBR (variable bitrate) control method is introduced. In this method, quantization scale is limited within a predefined range to keep picture quality. Using the total bitrate and transition of a virtually estimated decoder buffer that is updated by average bitrate, the quantization-scale range is controlled nonlinearly. A frame-based motion evaluation technique is used for scene-change detection and flash-detection to assign VOP (video object plane) coding types to improve random access capabilities and to increase coding efficiency. As a result, high-quality and real-time encoding of SDTV resolution is achieved at the bitrate of 2Mbps. (author abst.) |
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