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    • 7. 发明授权
    • Advanced bi-directional predictive coding of video frames
    • 视频帧的高级双向预测编码
    • US07609763B2
    • 2009-10-27
    • US10622378
    • 2003-07-18
    • Kunal MukerjeeSridhar SrinivasanBruce Chih-Lung Lin
    • Kunal MukerjeeSridhar SrinivasanBruce Chih-Lung Lin
    • H04N7/12H04N11/02H04N11/04H04B1/66
    • H04N19/577H04N19/132H04N19/56H04N19/587
    • Techniques and tools for coding/decoding of video images, and in particular, B-frames, are described. In one aspect, a video encoder/decoder determines a fraction for a current image in a sequence. The fraction represents an estimated temporal distance position for the current image relative to an interval between a reference images for the current image. The video encoder/decoder processes the fraction along with a motion vector for a first reference image, resulting in a representation of motion (e.g., constant or variable velocity motion) in the current image. Other aspects are also described, including intra B-frames, forward and backward buffers for motion vector prediction, bitplane encoding of direct mode prediction information, multiple motion vector resolutions/interpolation filters for B-frames, proactive dropping of B-frames, and signaling of dropped predicted frames.
    • 描述了用于视频图像,特别是B帧的编码/解码的技术和工具。 在一个方面,视频编码器/解码器确定序列中当前图像的分数。 该分数表示当前图像相对于当前图像的参考图像之间的间隔的估计时间距离位置。 视频编码器/解码器将分数与第一参考图像的运动矢量一起处理,导致当前图像中的运动(例如恒定或可变速度运动)的表示。 还描述了其他方面,包括帧内B帧,用于运动矢量预测的前向和后向缓冲器,直接模式预测信息的位平面编码,B帧的多个运动矢量分辨率/内插滤波器,B帧的主动丢弃和信令 的预测帧丢失。
    • 9. 发明申请
    • Coding of motion vector information
    • 运动矢量信息编码
    • US20050013498A1
    • 2005-01-20
    • US10622841
    • 2003-07-18
    • Sridhar SrinivasanPohsiang HsuThomas HolcombKunal MukerjeeBruce Lin
    • Sridhar SrinivasanPohsiang HsuThomas HolcombKunal MukerjeeBruce Lin
    • G06K9/36G06K9/46
    • H04N19/137G06K9/36G06K9/46H04N7/52H04N19/132H04N19/139H04N19/176H04N19/51H04N19/513H04N19/61H04N19/63H04N19/91
    • Techniques and tools for encoding and decoding motion vector information for video images are described. For example, a video encoder yields an extended motion vector code by jointly coding, for a set of pixels, a switch code, motion vector information, and a terminal symbol indicating whether subsequent data is encoded for the set of pixels. In another aspect, an encoder/decoder selects motion vector predictors for macroblocks. In another aspect, a video encoder/decoder uses hybrid motion vector prediction. In another aspect, a video encoder/decoder signals a motion vector mode for a predicted image. In another aspect, a video decoder decodes a set of pixels by receiving an extended motion vector code, which reflects joint encoding of motion information together with intra/inter-coding information and a terminal symbol. The decoder determines whether subsequent data exists for the set of pixels based on e.g., the terminal symbol.
    • 描述用于编码和解码用于视频图像的运动矢量信息的技术和工具。 例如,视频编码器通过针对一组像素共同编码一个开关码,运动矢量信息和指示后续数据是否被编码用于像素集合的终端符号来产生扩展运动矢量码。 在另一方面,编码器/解码器为宏块选择运动矢量预测器。 在另一方面,视频编码器/解码器使用混合运动矢量预测。 在另一方面,视频编码器/解码器针对预测图像发送运动矢量模式。 在另一方面,视频解码器通过接收扩展运动矢量码来解码一组像素,该扩展运动矢量码反映运动信息的联合编码以及帧内/帧间编码信息和终端符号。 解码器基于例如终端符号确定对于像素集合是否存在后续数据。