公开(公告)号：US20230007272A1

公开(公告)日：2023-01-05

申请号：US17894309

申请日：2022-08-24

Applicant: Apple Inc.

Inventor： Alexandros Michael TOURAPIS ,  Yeping SU ,  David SINGER ,  Hsi-Jung WU

IPC: H04N19/159 ,  H04N19/567 ,  H04N19/147 ,  H04N19/109 ,  H04N19/176 ,  H04N19/513 ,  H04N19/70

Abstract: The present disclosure describes techniques for coding and decoding video in which a plurality of coding hypotheses are developed for an input pixel block of frame content. Each coding hypothesis may include generation of prediction data for the input pixel block according to a respective prediction search. The input pixel block may be coded with reference to a prediction block formed from prediction data derived according to plurality of hypotheses. Data of the coded pixel block may be transmitted to a decoder along with data identifying a number of the hypotheses used during the coding to a channel. At a decoder, an inverse process may be performed, which may include generation of a counterpart prediction block from prediction data derived according to the hypothesis identified with the coded pixel block data, then decoding of the coded pixel block according to the prediction data.

公开(公告)号：US20240171742A1

公开(公告)日：2024-05-23

申请号：US18056915

申请日：2022-11-18

Applicant: APPLE INC.

Inventor： Alexandros TOUAPIS ,  Yeping SU ,  David SINGER ,  HSI-Jung WU

IPC: H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/60 ,  H04N19/91

CPC classification number: H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/60 ,  H04N19/91

Abstract: Video compression and decompression techniques are disclosed that provide improved bandwidth control for video compression and decompression systems. In particular, video coding and decoding techniques quantize input video in multiple dimensions. According to these techniques, pixel residuals may be generated from a comparison of an array of input data to an array of prediction data. The pixel residuals may be quantized in a first dimension. After the quantization, the quantized pixel residuals may be transformed to an array of transform coefficients. The transform coefficients may be quantized in a second dimension and entropy coded. Decoding techniques invert these processes. In still other embodiments, multiple quantizers may be provided upstream of the transform stage, either in parallel or in cascade, which provide greater flexibility to video coders to quantize data in different dimensions in an effort to balance the competing interest in compression efficiency and quality of reconstructed video.

公开(公告)号：US20200304807A1

公开(公告)日：2020-09-24

申请号：US16879007

申请日：2020-05-20

Applicant: Apple Inc.

Inventor： Alexandros Michael TOURAPIS ,  Yeping SU ,  David SINGER ,  Hsi-Jung WU

IPC: H04N19/159 ,  H04N19/567 ,  H04N19/147 ,  H04N19/109 ,  H04N19/176 ,  H04N19/513 ,  H04N19/70

Abstract: The present disclosure describes techniques for coding and decoding video in which a plurality of coding hypotheses are developed for an input pixel block of frame content. Each coding hypothesis may include generation of prediction data for the input pixel block according to a respective prediction search. The input pixel block may be coded with reference to a prediction block formed from prediction data derived according to plurality of hypotheses. Data of the coded pixel block may be transmitted to a decoder along with data identifying a number of the hypotheses used during the coding to a channel. At a decoder, an inverse process may be performed, which may include generation of a counterpart prediction block from prediction data derived according to the hypothesis identified with the coded pixel block data, then decoding of the coded pixel block according to the prediction data.

公开(公告)号：US20190246114A1

公开(公告)日：2019-08-08

申请号：US16257904

申请日：2019-01-25

Applicant: Apple Inc.

Inventor： Alexandros Michael TOURAPIS ,  Yeping SU ,  David SINGER ,  Hsi-Jung WU

IPC: H04N19/159 ,  H04N19/513 ,  H04N19/70 ,  H04N19/176

CPC classification number: H04N19/159 ,  H04N19/109 ,  H04N19/147 ,  H04N19/176 ,  H04N19/513 ,  H04N19/567 ,  H04N19/70

Abstract: The present disclosure describes techniques for coding and decoding video in which a plurality of coding hypotheses are developed for an input pixel block of frame content. Each coding hypothesis may include generation of prediction data for the input pixel block according to a respective prediction search. The input pixel block may be coded with reference to a prediction block formed from prediction data derived according to plurality of hypotheses. Data of the coded pixel block may be transmitted to a decoder along with data identifying a number of the hypotheses used during the coding to a channel. At a decoder, an inverse process may be performed, which may include generation of a counterpart prediction block from prediction data derived according to the hypothesis identified with the coded pixel block data, then decoding of the coded pixel block according to the prediction data.