公开(公告)号：WO2021086512A1

公开(公告)日：2021-05-06

申请号：PCT/US2020/051462

申请日：2020-09-18

Applicant: APPLE INC.

Inventor： TOURAPIS, Alexandros ,  SINGER, David W. ,  MEHLEM, Dominik ,  RAPAKA, Krishnakanth

IPC: H04N19/119 ,  H04N19/176 ,  H04N19/46 ,  H04N19/583 ,  H04N19/86

Abstract: Techniques for coding and decoding video may include predicting picture regions defined by a time-varying tessellation and/or by a tessellation that varies spatially within a picture. These techniques improve decoded video quality, for example, by reducing block-based visual artifacts. Tessellation patterns may be irregular spatially to prevent alignment of some prediction region boundaries within a picture. Tessellation patterns may vary over time based on a spatial offset value, and the spatial offset value may be determined via a modulo function. Tessellation patterns may include overlapped shapes, for example when used in conjunction with overlapped block motion compensation.

公开(公告)号：WO2021034722A1

公开(公告)日：2021-02-25

申请号：PCT/US2020/046533

申请日：2020-08-14

Applicant: APPLE INC.

Inventor： TOURAPIS, Alexandros ,  RAPAKA, Krishnakanth ,  MEHLEM, Dominik

IPC: H04N19/82 ,  H04N19/17 ,  H04N19/117 ,  H04N19/61 ,  H04N19/182 ,  H04N19/186

Abstract: A system comprises an encoder configured to compress video data. The encoder includes an adaptive bilateral filter that uses look-up tables. The encoder may encode one or more adaptive adjustment factors to be used by a decoder to select or adjust look-up tables used to decode the compressed video data.

公开(公告)号：WO2021262419A1

公开(公告)日：2021-12-30

申请号：PCT/US2021/035879

申请日：2021-06-04

Applicant: APPLE INC.

Inventor： RAPAKA, Krishnakanth ,  CHON, Jaehong ,  TOURAPIS, Alexandros ,  SINGER, David W.

IPC: H04N19/126 ,  H04N19/157 ,  H04N19/172 ,  H04N19/174 ,  H04N19/176 ,  H04N19/70 ,  H04N19/124 ,  H04N19/186 ,  H04N19/82

Abstract: Improved video coding and decoding techniques are described, including techniques to derive quantization step sizes adaptively with quantization step size table templates. Quantization techniques described provide finer-grained control over quantization with a more flexible quantization step size especially at higher degrees of quantization. This may result in improved overall compression quality. Other coding parameters, such as in-loop filtering parameters, may be derived based on the more flexible quantization parameters.

公开(公告)号：WO2020131232A1

公开(公告)日：2020-06-25

申请号：PCT/US2019/059429

申请日：2019-11-01

Applicant: APPLE INC.

Inventor： TOURAPIS, Alexandros Michael ,  KIM, Jungsun ,  RAPAKA, Krishnakanth ,  SINGER, David William

IPC: H04N19/70 ,  H04N19/105 ,  H04N19/58 ,  H04N19/573 ,  H04N19/172

Abstract: Techniques for encoding video with motion compensation include a compressed bitstream syntax that includes a list of all motion prediction reference frames without distinguishing between short-term reference frame and long-term reference frames. The list of reference frames may be provided in a slice header and may apply to encoded data video data within the corresponding slice. The list may be prefaced with a single number indicating the total number of reference frames. In an aspect delta POC reference numbers may be encoded with a flag indicating the sign of the delta POC when the absolute value of the POC is not equal to zero. In another aspect, a flag may be encoded for every reference frame indicating if POC information should be used when scaling prediction references, and a weighting parameter may be included when POC information should be used.

公开(公告)号：EP4169250A1

公开(公告)日：2023-04-26

申请号：EP21736430.6

申请日：2021-06-04

Applicant: Apple Inc.

Inventor： RAPAKA, Krishnakanth ,  CHON, Jaehong ,  TOURAPIS, Alexandros ,  SINGER, David W.

IPC: H04N19/126 ,  H04N19/157 ,  H04N19/172 ,  H04N19/174 ,  H04N19/176 ,  H04N19/70

公开(公告)号：EP4014503A1

公开(公告)日：2022-06-22

申请号：EP20764512.8

申请日：2020-08-14

Applicant: Apple Inc.

Inventor： TOURAPIS, Alexandros ,  RAPAKA, Krishnakanth ,  MEHLEM, Dominik

IPC: H04N19/82 ,  H04N19/17 ,  H04N19/117 ,  H04N19/61 ,  H04N19/182 ,  H04N19/186

公开(公告)号：EP4052465A1

公开(公告)日：2022-09-07

申请号：EP20786361.4

申请日：2020-09-18

Applicant: Apple Inc.

Inventor： TOURAPIS, Alexandros ,  SINGER, David W. ,  MEHLEM, Dominik ,  RAPAKA, Krishnakanth

IPC: H04N19/119 ,  H04N19/176 ,  H04N19/46 ,  H04N19/583 ,  H04N19/86