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基于DCT域的MPEG―2视频色度格式转换

DOI: 10.11834/jig.20020395

Keywords: 视频压缩,帧间内插,MPEG-2,色度格式,转码器,DCT域,图象压缩

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Abstract:

提出了一种新的基于DCT域的MPEG-2码流转换算法,该算法与现有算法,即通过解码、空域采样率转换来设定新的码流参数,再编码的算法相比,无需IDCT、DCT操作,便可在DCT域实现码流转换,而且省去了运动矢量估值和运动补偿过程,不仅节省了大量帧存和减少了运算量,而且更具有实时性的优点,对MPEG-2MP@ML到4:2:2Profile@ML码流转换算法实例的分析和现实表明:该算法能简单有效的实现压缩域码流转换,其思想同样可广泛用于其他基于DCT压缩图象的采样率转换、线性滤波等任务。

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