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首页> 外文期刊>IEEE Transactions on Circuits and Systems for Video Technology >Video extraction for fast content access to MPEG compressed videos
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Video extraction for fast content access to MPEG compressed videos

机译：视频提取以快速内容访问MPEG压缩视频

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摘要

As existing video processing technology is primarily developed in the pixel domain yet digital video is stored in compressed format, any application of those techniques to compressed videos would require decompression. For discrete cosine transform (DCT)-based MPEG compressed videos, the computing cost of standard row-by-row and column-by-column inverse DCT (IDCT) transforms for a block of 8/spl times/8 elements requires 4096 multiplications and 4032 additions, although practical implementation only requires 1024 multiplications and 896 additions. In this paper, we propose a new algorithm to extract videos directly from MPEG compressed domain (DCT domain) without full IDCT, which is described in three extraction schemes: 1) video extraction in 2/spl times/2 blocks with four coefficients; 2) video extraction in 4/spl times/4 blocks with four DCT coefficients; and 3) video extraction in 4/spl times/4 blocks with nine DCT coefficients. The computing cost incurred only requires 8 additions and no multiplication for the first scheme, 2 multiplication and 28 additions for the second scheme, and 47 additions (no multiplication) for the third scheme. Extensive experiments were carried out, and the results reveal that: 1) the extracted video maintains competitive quality in terms of visual perception and inspection and 2) the extracted videos preserve the content well in comparison with those fully decompressed ones in terms of histogram measurement. As a result, the proposed algorithm will provide useful tools in bridging the gap between pixel domain and compressed domain to facilitate content analysis with low latency and high efficiency such as those applications in surveillance videos, interactive multimedia, and image processing.
机译：由于现有的视频处理技术主要在像素域中开发，但数字视频以压缩格式存储，因此任何向压缩视频的技术应用都需要减压。对于离散余弦变换（DCT）基础的MPEG压缩视频，标准逐行和列 - 逐列的计算成本为8 / SPL时间/ 8个元素块的逐块变换需要4096个乘法4032添加，虽然实际实施只需要1024个乘法和896个添加。在本文中，我们提出了一种新的算法，可以直接从MPEG压缩域（DCT域）中提取视频，而无需完全IDCT，其在三种提取方案中描述：1）在具有四个系数的2 / SPL时间/ 2个块中的视频提取; 2）4 / SPL时间/ 4个块中的视频提取，具有四个DCT系数; 3）4 / SPL时的视频提取/ 4个块，具有九个DCT系数。所产生的计算成本仅需要8个添加，并且对于第三方案的第2个方案，2乘法和28个添加，以及第三方案的47个添加（无乘法）。进行了广泛的实验，结果表明：1）提取的视频在视觉感知和检查方面保持竞争质量，2）提取的视频与直方图测量方面的完全解压缩的那些相比，提取的视频保持良好。结果，该算法将提供促进像素域和压缩域之间的间隙的有用工具，以便于具有低延迟和高效率的内容分析，例如监视视频，交互式多媒体和图像处理中的那些应用。

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