公开(公告)号：US20170105005A1

公开(公告)日：2017-04-13

申请号：US15131574

申请日：2016-04-18

Applicant: QUALCOMM Incorporated

Inventor： Ying Chen ,  Xuerui Zhang ,  Mayank Tiwari ,  Ning Bi ,  Prasanjit Panda

IPC: H04N19/159 ,  H04N19/169 ,  H04N19/172 ,  H04N19/58 ,  H04N19/105

CPC classification number: H04N19/159 ,  H04N19/105 ,  H04N19/162 ,  H04N19/172 ,  H04N19/176 ,  H04N19/188 ,  H04N19/46 ,  H04N19/58 ,  H04N19/70

Abstract: Techniques and systems are provided for performing predictive random access using a background picture. For example, a method of decoding video data includes obtaining an encoded video bitstream comprising a plurality of pictures. The plurality of pictures include a plurality of predictive random access pictures. A predictive random access picture is at least partially encoded using inter-prediction based on at least one background picture. The method further includes determining, for a time instance of the video bitstream, a predictive random access picture of the plurality of predictive random access pictures with a time stamp closest in time to the time instance. The method further includes determining a background picture associated with the predictive random access picture, and decoding at least a portion of the predictive random access picture using inter-prediction based on the background picture.

公开(公告)号：US20180332281A1

公开(公告)日：2018-11-15

申请号：US15977590

申请日：2018-05-11

Applicant: QUALCOMM Incorporated

Inventor： Yang Yu ,  In Suk Chong ,  Xianglin Wang ,  Prasanjit Panda ,  Mayank Tiwari ,  Marta Karczewicz ,  Shashidhar Jangili

IPC: H04N19/107 ,  H04N19/124 ,  H04N19/177 ,  H04N19/91 ,  H04N19/176

CPC classification number: H04N19/107 ,  H04N19/124 ,  H04N19/176 ,  H04N19/177 ,  H04N19/91

Abstract: This disclosure describes techniques for achieve high coding efficiency by periodically encoding anchor frames with a lower Quantization Parameter (QP) to provide better prediction for the following frames. Techniques include adaptively deciding which frames are encoded with lower QP by use of the collected encoding statistics via an encoding scheme with or without rate control.

公开(公告)号：US10063861B2

公开(公告)日：2018-08-28

申请号：US15131574

申请日：2016-04-18

Applicant: QUALCOMM Incorporated

Inventor： Ying Chen ,  Xuerui Zhang ,  Mayank Tiwari ,  Ning Bi ,  Prasanjit Panda

IPC: H04N19/00 ,  H04N19/159 ,  H04N19/58 ,  H04N19/105 ,  H04N19/172 ,  H04N19/169

CPC classification number: H04N19/159 ,  H04N19/105 ,  H04N19/162 ,  H04N19/172 ,  H04N19/176 ,  H04N19/188 ,  H04N19/46 ,  H04N19/58 ,  H04N19/70

Abstract: Techniques and systems are provided for performing predictive random access using a background picture. For example, a method of decoding video data includes obtaining an encoded video bitstream comprising a plurality of pictures. The plurality of pictures include a plurality of predictive random access pictures. A predictive random access picture is at least partially encoded using inter-prediction based on at least one background picture. The method further includes determining, for a time instance of the video bitstream, a predictive random access picture of the plurality of predictive random access pictures with a time stamp closest in time to the time instance. The method further includes determining a background picture associated with the predictive random access picture, and decoding at least a portion of the predictive random access picture using inter-prediction based on the background picture.

公开(公告)号：US20160234496A1

公开(公告)日：2016-08-11

申请号：US14864527

申请日：2015-09-24

Applicant: QUALCOMM Incorporated

Inventor： Prasanjit Panda ,  Narendranath Malayath ,  Anush Krishna Moorthy ,  Mayank Tiwari

IPC: H04N19/124 ,  H04N19/40 ,  H04N19/44 ,  H04N19/85 ,  H04N19/426

CPC classification number: H04N19/124 ,  H04N19/14 ,  H04N19/172 ,  H04N19/40 ,  H04N19/428 ,  H04N19/44 ,  H04N19/85

Abstract: Techniques are described for performing near visually lossless video recompression. The disclosed techniques generate video frames having relatively small bitrates and relatively small file sizes while retaining approximately a same level of visually perceivable video quality as the originally recorded video frames. In general, recompression of a video frame takes an input video frame and produces a second copy of the video frame that has the same or lower Nitrate. The proposed techniques address the problem of recompressing a video frame with no perceivable loss in visual quality (i.e., visually lossless recompression) compared to the original recording of the video frame. In addition, the disclosed techniques provide one-step recompression of video frames that includes a single decoding and encoding of each video frame.

Abstract translation: 描述了用于执行近视觉无损视频再压缩的技术。 所公开的技术产生具有相对小的比特率和相对小的文件大小的视频帧，同时保持与原始记录的视频帧大致相同的视觉上可感知的视频质量水平。 通常，视频帧的重新压缩采用输入视频帧，并产生具有相同或更低硝酸盐的视频帧的第二副本。 所提出的技术解决了与视频帧的原始记录相比，视频质量（即视觉无损重新压缩）没有可察觉的损失来再压缩视频帧的问题。 此外，所公开的技术提供包括每个视频帧的单个解码和编码的视频帧的一步重新压缩。