公开(公告)号：US20240048776A1

公开(公告)日：2024-02-08

申请号：US17956444

申请日：2022-09-29

Applicant: Apple Inc.

Inventor： Yixin Du ,  Alexandros Tourapis ,  Alican Nalci ,  Guoxin Jin ,  Hilmi Enes Egilmez ,  Hsi-Jung Wu ,  Jun Xin ,  Yeqing Wu ,  Yunfei Zheng

IPC: H04N19/86 ,  H04N19/117 ,  H04N19/139 ,  H04N19/176

CPC classification number: H04N19/86 ,  H04N19/117 ,  H04N19/139 ,  H04N19/176

Abstract: Disclosed is a method that includes receiving an image frame having a plurality of coded blocks, determining a prediction unit (PU) from the plurality of coded blocks, determining one or more motion compensation units arranged in an array within the PU, and applying a filter to one or more boundaries of the one or more motion compensation units. Also disclosed is a method that includes receiving a reference frame that includes a reference block, determining a timing for deblocking a current block, performing motion compensation on the reference frame to obtain a predicted frame that includes a predicted block, performing reconstruction on the predicted frame to obtain a reconstructed frame that includes a reconstructed PU, and applying, at the timing for deblocking the current block, a deblocking filter based on one or more parameters to the reference block, the predicted block, or the reconstructed PU.

公开(公告)号：US20240195978A1

公开(公告)日：2024-06-13

申请号：US18065220

申请日：2022-12-13

Applicant: Apple Inc.

Inventor： Yeqing WU ,  Yunfei Zheng ,  Alexandros Tourapis ,  Yixin Du ,  Alican Nalci ,  Hilmi E. Egilmez ,  Guoxin Jin ,  Jun Xin ,  Hsi-Jung Wu

IPC: H04N19/137 ,  H04N19/105 ,  H04N19/172 ,  H04N19/176

CPC classification number: H04N19/137 ,  H04N19/105 ,  H04N19/172 ,  H04N19/176

Abstract: The present disclosure describes techniques for efficient coding of motion vectors developed for multi-hypothesis coding applications. According to these techniques, when coding hypotheses are developed, each having a motion vector identifying a source of prediction for a current pixel block, a motion vector for a first one of the coding hypotheses may be predicted from the motion vector of a second coding hypothesis. The first motion vector may be represented by coding a motion vector residual, which represents a difference between the developed motion vector for the first coding hypothesis and the predicted motion vector for the first coding hypothesis, and outputting the coded residual to a channel. In another embodiment, a motion vector residual may be generated for a motion vector of a first coding hypothesis, and the first motion vector and the motion vector residual may be used to predict a second motion vector and a predicted motion vector residual. The second hypothesis's motion vector may be coded as a difference between the motion vector, the predicted second motion vector, and the predicted motion vector residual. In a further embodiment, a single motion vector residual may be output for the motion vectors of two coding hypotheses representing a difference between the motion vector of one of the hypotheses and a predicted motion vector for that hypothesis.

公开(公告)号：US20250071345A1

公开(公告)日：2025-02-27

申请号：US18945408

申请日：2024-11-12

Applicant: Apple Inc.

Inventor： Yixin Du ,  Alexandros Tourapis ,  Alican Nalci ,  Guoxin Jin ,  Hilmi Enes Egilmez ,  Hsi-Jung Wu ,  Jun Xin ,  Yeqing Wu ,  Yunfei Zheng

IPC: H04N19/86 ,  H04N19/117 ,  H04N19/139 ,  H04N19/176 ,  H04N19/82

Abstract: Disclosed is a method that includes receiving an image frame having a plurality of coded blocks, determining a prediction unit (PU) from the plurality of coded blocks, determining one or more motion compensation units arranged in an array within the PU, and applying a filter to one or more boundaries of the one or more motion compensation units. Also disclosed is a method that includes receiving a reference frame that includes a reference block, determining a timing for deblocking a current block, performing motion compensation on the reference frame to obtain a predicted frame that includes a predicted block, performing reconstruction on the predicted frame to obtain a reconstructed frame that includes a reconstructed PU, and applying, at the timing for deblocking the current block, a deblocking filter based on one or more parameters to the reference block, the predicted block, or the reconstructed PU.

公开(公告)号：US20250080726A1

公开(公告)日：2025-03-06

申请号：US18819841

申请日：2024-08-29

Applicant: Apple Inc.

Inventor： Hilmi Enes Egilmez ,  Alexandros Tourapis ,  Alican Nalci ,  Guoxin Jin ,  Hsi-Jung Wu ,  Jun Xin ,  Yeqing Wu ,  Yixin Du ,  Yunfei Zheng

IPC: H04N19/107 ,  H04N19/124 ,  H04N19/13 ,  H04N19/17 ,  H04N19/70

Abstract: Systems and methods are configured for accessing data representing video content, the data comprising a set of one or more symbols each associated with a syntax element; performing a probability estimation, for encoding the data, comprising: for each symbol, obtaining, based on the syntax element for that symbol, an adaptivity rate parameter value, the adaptivity rate parameter value being a function of a number of symbols in the set of one or more symbols; updating the adaptivity rate parameter value as a function of an adjustment parameter value; and generating, based on the updated adaptivity rate parameter value, a probability value; generating a probability estimation; and encoding, based on the CDF of the probability estimation, the data comprising the set of one or more symbols for transmission.

公开(公告)号：US20240323442A1

公开(公告)日：2024-09-26

申请号：US18603138

申请日：2024-03-12

Applicant: Apple Inc.

Inventor： Alican Nalci ,  Guoxin Jin ,  Hilmi Enes Egilmez ,  Hsi-Jung Wu ,  Jun Xin ,  Yixin Du ,  Yunfei Zheng ,  Yeqing Wu

IPC: H04N19/625 ,  H04N19/176 ,  H04N19/70

CPC classification number: H04N19/625 ,  H04N19/176 ,  H04N19/70

Abstract: In an example method, a decoder accesses a bitstream representing video content, and parses one or more flexible coefficient position (FCP) syntax from the bitstream, where the one or more FCP syntax indicate one or more index values. The decoder further determines side information representing one or more characteristics of an encoded portion of the video content. The decoder interprets the one or more FCP syntax based on the side information, including determining a coefficient position with respect to the encoded portion of the video content based on the one or more index values and the side information. The decoder decodes the encoded portion of the video content according to the coefficient position.