【摘要】 多媒体应用领域存在多种视频编码标准,因此实现不同视频格式之间的自适应转换具有重要意义.该文提出了一种新颖的基于运动信息描述的视频格式自适应解决方案.该方案利用作者前期提出的基于H.264/AVC标准的运动信息描述算法提取能够复用的详细完备的运动信息,根据需要快速生成不同视频编码格式、多种码率的码流;也可以利用此运动信息,指导不同视频格式码流之间的快速自适应转换.作为该方案的具体应用,文中提出了一种针对H.264/AVC标准和MPEG-2标准的视频自适应方法.实验结果表明,文中提出的基于运动信息描述的视频格式自适应解决方案不仅可以很好地保证编码性能,同时具有较低的计算复杂度.更多还原

【Abstract】 Due to the existence of various video coding standards in multimedia applications,it is of great significance to implement video format adaptation among these standards. This paper presents a novel framework for video format adaptation,which is based on motion description and is originated from the authors’ early work. Such motion description comprises abundant motion information,and can be obtained by pre-encoding a video sequence. Motion description can be used not only to fast generate a required bitstream,but also to guide the transcoding between different video formats. As an example,format adaptation between H.264/AVC and MPEG-2 which is on the basis of the proposed framework is illustrated in detail. A number of comparison experiments are performed to show that the proposed solution can greatly reduce the computational complexity meanwhile retain the coding efficiency,which manifestly demonstrates the proposed solution is superior to the conventional transcoding technique.更多还原