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    • 7. 发明授权
    • Apparatus and method for switching between single description and multiple descriptions
    • 用于在单个描述和多个描述之间切换的装置和方法
    • US08107530B2
    • 2012-01-31
    • US11518356
    • 2006-09-11
    • Il-Koo KimNam-Ik Cho
    • Il-Koo KimNam-Ik Cho
    • H04N7/12H04N11/02H04N11/04H04J3/16H04J3/22
    • H04L1/0009H04N19/12H04N19/166H04N19/172H04N19/18H04N19/19H04N19/39H04N19/40
    • Provided is an apparatus for and a method of transcoding video, in which, in the transmission of a compressed video, the compressed video is transcoded into multiple descriptions in an error prone environment and is transcoded into a single description in an lower error or errorless environment. Video transcoder includes a decoding unit, a single description/multiple description determining unit, and a transcoding unit. The decoding unit decodes a compressed video to generate video header, a motion vector, and a DCT (discrete cosine transform) coefficient for each frame. The single description/multiple description determining unit determines whether to perform transcoding into a single description or multiple descriptions based on the possibility of errors occurring in a transmission channel of the compressed video. The transcoding unit performs transcoding into the single description by coding the DCT coefficient together with the video header and the motion vector when the single description/multiple description determining unit determines to perform transcoding into the single description and performs transcoding into the multiple descriptions by dividing the DCT coefficient into a plurality of DCT coefficients and coding each of the DCT coefficients together with the video header and the motion vector when the single description/multiple description determining unit determines to perform transcoding into the multiple descriptions.
    • 提供了一种对视频进行代码转换的装置和方法,其中在压缩视频的传输中,压缩视频在易错环境中被转码为多个描述,并且在较低错误或无错误环境中被转码为单个描述 。 视频代码转换器包括解码单元,单个描述/多重描述确定单元和代码转换单元。 解码单元对压缩视频进行解码,以生成每帧的视频头,运动矢量和DCT(离散余弦变换)系数。 单个描述/多重描述确定单元基于在压缩视频的传输信道中出现错误的可能性来确定是否将代码转换为单个描述或多个描述。 代码转换单元通过在单个描述/多重描述确定单元确定执行代码转换为单个描述并且通过将代码转换分成多个描述来执行代码转换,将DCT系数与视频标题和运动矢量一起进行编码来执行代码转换为单个描述 DCT系数分解为多个DCT系数,并且当单个描述/多重描述确定单元确定执行代码转换为多个描述时,将每个DCT系数与视频标题和运动矢量一起编码。