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MPEG-2/MPEG-4实时视频转换中帧类型转换及运动矢量映射
Conversion of frame types and motion vectors mapping in MPEG-2 to MPEG-4 real-time video transcoding
【摘要】 M PEG-4 SP仅支持IVOP和PVOP两种视频对象平面,因而在M PEG-2 M P到M PEG-4 SP的实时视频转码器中,必须将M PEG-2 M P中的B帧进行类型转换以及相应的运动矢量映射.在不考虑分辨率采样的情况下,提出了帧类型转换与运动矢量映射的具体方法,实验结果表明,在保证一定视频质量的情况下,该方法能够有效实现帧类型转换.
【Abstract】 Conversion of frame types and mapping of correspond motion vectors must be done in MPEG-2 MP to MPEG-4 SP real-time video transcoder because of IVOP and PVOP only supported by MPEG-4 SP.Without considering resolution down sampling,a detailed method of motion vector mapping is put forward aiming at conversion of frame types.Experimental results show that this method can implement conversion of frame types efficiently keeping acceptable video quality.
【关键词】 MPEG-2;
MPEG-4;
实时视频转换;
运动矢量;
【Key words】 MPEG-2; MPEG-4; real-time video transcoding; motion vectors;
【Key words】 MPEG-2; MPEG-4; real-time video transcoding; motion vectors;
【基金】 广西科学研究与技术开发计划资助(桂科攻0330010-1);广西“新世纪十百千人才工程”专项资金(2002222)
- 【文献出处】 广西大学学报(自然科学版) ,Journal of Guangxi University(Natural Science Edition) , 编辑部邮箱 ,2006年02期
- 【分类号】TN919.81
- 【被引频次】3
- 【下载频次】81