公开(公告)号：US20050013365A1

公开(公告)日：2005-01-20

申请号：US10622378

申请日：2003-07-18

Applicant: Kunal Mukerjee ,  Sridhar Srinivasan ,  Bruce Lin

Inventor： Kunal Mukerjee ,  Sridhar Srinivasan ,  Bruce Lin

IPC: H04N7/26 ,  H04N7/46 ,  H04N7/12

CPC classification number: H04N19/577 ,  H04N19/132 ,  H04N19/56 ,  H04N19/587

Abstract: 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.

Abstract translation: 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。