公开(公告)号：US20230300341A1

公开(公告)日：2023-09-21

申请号：US18157360

申请日：2023-01-20

Applicant: APPLE INC.

Inventor： Yeqing WU ,  Yunfei ZHENG ,  Alexandros TOURAPIS ,  Alican NALCI ,  Yixin DU ,  Hilmi Enes EGILMEZ ,  Albert E. KEINATH ,  Jun XIN ,  Hsi-Jung WU

IPC: H04N19/139 ,  H04N19/176

CPC classification number: H04N19/139 ,  H04N19/176

Abstract: Techniques are disclosed for generating virtual reference frames that may be used for prediction of input video frames. The virtual reference frames may be derived from already-coded reference frames and thereby incur reduced signaling overhead. Moreover, signaling of virtual reference frames may be avoided until an encoder selects the virtual reference frame as a prediction reference for a current frame. In this manner, the techniques proposed herein contribute to improved coding efficiencies.

公开(公告)号：US20230142771A1

公开(公告)日：2023-05-11

申请号：US17979025

申请日：2022-11-02

Applicant: Apple Inc.

Inventor： Yixin DU ,  Alexandros TOURAPIS ,  Yunfei ZHENG ,  Jun XIN ,  Mukta S. Gore ,  Alican NALCI ,  Mei T. GUO ,  Yeqing WU ,  Hsi-Jung WU

IPC: H04N19/82 ,  H04N19/132 ,  H04N19/186 ,  H04N19/176

CPC classification number: H04N19/82 ,  H04N19/132 ,  H04N19/186 ,  H04N19/176

Abstract: A filtering system for video coders and decoders is disclosed that includes a feature detector having an input for samples reconstructed from coded video data representing a color component of source video, and having an output for data identifying a feature recognized therefrom, an offset calculator having an input for the feature identification data from the feature detector and having an output for a filter offset, and a filter having an input for the filter offset from the offset calculator and an input for the reconstructed samples, and having an output for filtered samples. The filtering system is expected to improve operations of video coder/decoder filtering systems by selecting filtering offsets from analysis of recovered video data in a common color plane as the samples that will be filtered.