METHOD AND SYSTEM FOR MULTIPLE PASS VIDEO CODING
    61.
    发明申请
    METHOD AND SYSTEM FOR MULTIPLE PASS VIDEO CODING 失效
    多通道视频编码方法与系统

    公开(公告)号:US20080225959A1

    公开(公告)日:2008-09-18

    申请号:US12131268

    申请日:2008-06-02

    IPC分类号: H04N7/26

    摘要: A real-time MPEG video coding system with information look-ahead for constant bit rate (CBR) applications, such as, for example, Video-on-Demand (VoD) over ADSL. This scheme employs two MPEG encoders. The second encoder has a buffer to delay the input by an amount of time relative to the first encoder to create a look-ahead window. In encoding, the first encoder collects the information of statistics and rate-quality characteristics. An on-line information processor then uses the collected information to derive the best coding strategy for the second encoder to encode the incoming frames in the look-ahead window. The second encoder uses the encoding parameters from the processor as the coding guide to execute the coding strategy and generate the final bitstream.

    摘要翻译: 一种实时MPEG视频编码系统,其具有针对恒定比特率(CBR)应用的信息,例如通过ADSL的视频点播(VoD)。 该方案采用两个MPEG编码器。 第二编码器具有缓冲器,用于将输入延迟相对于第一编码器的时间量以创建预览窗口。 在编码中,第一编码器收集统计信息和速率质量特征。 然后,在线信息处理器使用所收集的信息来导出用于第二编码器的最佳编码策略,以对前进窗口中的输入帧进行编码。 第二编码器使用来自处理器的编码参数作为编码指南来执行编码策略并生成最终比特流。

    Method for video transcoding with adaptive frame rate control
    62.
    发明授权
    Method for video transcoding with adaptive frame rate control 有权
    用自适应帧速率控制进行视频转码的方法

    公开(公告)号:US07330509B2

    公开(公告)日:2008-02-12

    申请号:US10661308

    申请日:2003-09-12

    申请人: Ligang Lu Shan Liu

    发明人: Ligang Lu Shan Liu

    IPC分类号: H04N7/12 G06K9/36

    CPC分类号: H04N19/40

    摘要: A video transcoding method is provided for transcoding a first signal stream compressed by a first coding scheme to a second signal stream compressed by a second coding scheme. The method employs an adaptive frame rate and a joint temporal-spatial rate control technique, such that the overall quality of compressed MPEG video can be significantly enhanced when the transcoding is controlled in the joint temporal (picture or frame rate) and spatial (quantization) domains. One embodiment considers transcoding from high bit rate video with larger image size (e.g. 4CIF/4SIF, CIF) coded by one coding technique, e.g., MPEG-2 to a lower bit rate video with smaller image size (e.g. CIF, QCIF) coded by the same or another coding technique, e.g., MPEG-4.

    摘要翻译: 提供了一种视频转码方法,用于将由第一编码方案压缩的第一信号流转码为由第二编码方案压缩的第二信号流。 该方法采用自适应帧速率和联合时空速率控制技术,使得当在联合时间(图像或帧速率)和空间(量化)控制中进行代码转换时,可以显着增强压缩MPEG视频的总体质量, 域名 一个实施例考虑通过一种编码技术(例如MPEG-2)将较大图像大小(例如4CIF / 4SIF,CIF)的高比特率视频代码转换为具有较小图像大小的较低比特率视频(例如,CIF,QCIF),其由 相同或另一种编码技术,例如MPEG-4。

    System and method for reencoding segments of buffer constrained video streams
    63.
    发明授权
    System and method for reencoding segments of buffer constrained video streams 失效
    用于重新编码缓冲器受限视频流段的系统和方法

    公开(公告)号:US06522693B1

    公开(公告)日:2003-02-18

    申请号:US09511859

    申请日:2000-02-23

    IPC分类号: H04N718

    摘要: A system and method for generating an MPEG compliant video stream with satisfactory visual quality. The method employs re-encoding at a higher (or lower) bit rate, only the segments with unsatisfactory visual picture quality while retaining other parts of the original video stream and then merging the re-encoded segments with the remaining original portions. If the original video stream is coded at a reasonable bit rate, the number and length of those segments with unsatisfactory visual picture quality will be few and short. Re-encoding only those segments can save very significant amount of cost and only requires minimal additional storage space. Furthermore, the portions with satisfactory picture quality will be retained. The system and method is applicable to MPEG and non-MPEG compliant data streams.

    摘要翻译: 一种用于产生具有令人满意的视觉质量的MPEG兼容视频流的系统和方法。 该方法采用更高(或更低)比特率的重新编码,仅使用具有不令人满意的视觉图像质量的片段,同时保留原始视频流的其他部分,然后将重新编码的片段与剩余的原始部分合并。 如果原始视频流以合理的比特率被编码,则具有不令人满意的视觉画面质量的那些片段的数量和长度将很少且很短。 仅重新编码这些分段可以节省非常大量的成本,并且只需要最少的额外存储空间。 此外,将保留具有令人满意的图像质量的部分。 该系统和方法适用于MPEG和非MPEG兼容的数据流。