公开(公告)号：US11936867B2

公开(公告)日：2024-03-19

申请号：US17234596

申请日：2021-04-19

Applicant: Apple Inc.

Inventor： Krishnakanth Rapaka ,  Jaehong Chon ,  Alexandros Tourapis ,  David W. Singer

IPC: H04N19/124 ,  H04N19/172 ,  H04N19/186 ,  H04N19/82

CPC classification number: H04N19/124 ,  H04N19/172 ,  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：US20240080498A1

公开(公告)日：2024-03-07

申请号：US18101571

申请日：2023-01-25

Applicant: Apple Inc.

Inventor： Jae Young Park ,  Jaehong Chon ,  Jim C Chou ,  Athanasios Leontaris

IPC: H04N19/86 ,  H04N19/436 ,  H04N19/513 ,  H04N19/52 ,  H04N19/53

CPC classification number: H04N19/86 ,  H04N19/436 ,  H04N19/52 ,  H04N19/521 ,  H04N19/53

Abstract: The present disclosure is directed towards image processing circuitry that applies temporal filtering to video image data along motion trajectories in the video image data. The temporal filtering may be applied along motion trajectories in the image data, by filtering source pixels by reference pixel values and the refined motion vectors. The temporal filtering circuitry may fetch source and reference pixel values based on received motion vectors from an encoding pipeline. Additionally, the temporal filtering circuitry may include a motion vector refinement block along with a temporal filtering block, such that the video image data may be filtered based on refined motion vectors and source and reference pixel values.

公开(公告)号：US11979572B2

公开(公告)日：2024-05-07

申请号：US17234596

申请日：2021-04-19

Applicant: Apple Inc.

Inventor： Krishnakanth Rapaka ,  Jaehong Chon ,  Alexandros Tourapis ,  David W. Singer

IPC: H04N19/124 ,  H04N19/172 ,  H04N19/186 ,  H04N19/82

CPC classification number: H04N19/124 ,  H04N19/172 ,  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：US20240388720A1

公开(公告)日：2024-11-21

申请号：US18784149

申请日：2024-07-25

Applicant: Apple Inc.

Inventor： Yunfei Zheng ,  Alexandros Tourapis ,  Alican Nalci ,  Felix C. Fernandes ,  Hilmi Enes Egilmez ,  Hsi-Jung Wu ,  Jaehong Chon ,  Jun Xin ,  Yeqing Wu ,  Yixin Du

IPC: H04N19/159 ,  H04N19/105 ,  H04N19/172 ,  H04N19/43 ,  H04N19/58

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for reducing a quantity of buffers for a video codec. One of the methods includes determining, from a plurality of prediction modes, a prediction mode for data that represents frame data in a frame; in response to determining the prediction mode, selecting, using the prediction mode, one or more buffers from a plurality of buffers, each buffer of which is for a prediction mode from the plurality of prediction modes, a first quantity of buffers in the plurality of buffers being less than a second quantity of prediction modes in the plurality of prediction modes; retrieving, from each of the one or more buffers, historical data for the frame data; and in response to retrieving the historical data, generating, using the historical data, updated data for the frame data in the frame of the video sequence.