公开(公告)号：US20200120345A1

公开(公告)日：2020-04-16

申请号：US16156193

申请日：2018-10-10

Applicant: Apple Inc.

Inventor： Mei GUO ,  Jun XIN ,  Jun XU ,  Yeping SU ,  Chris CHUNG ,  Xiaosong ZHOU ,  Hsi-Jung WU

IPC: H04N19/186 ,  H04N19/12 ,  H04N19/136 ,  H04N19/51

Abstract: Systems and methods are disclosed for reshaping HDR video content to improve compression efficiency while using standard encoding/decoding techniques. Input HDR video frames, e.g., represented in an IPT color space, may be reshaped before the encoding/decoding process and the corresponding reconstructed HDR video frames may then be reverse reshaped. The disclosed reshaping methods may be combinations of scene-based or segment-based methods.

公开(公告)号：US20170359596A1

公开(公告)日：2017-12-14

申请号：US15178304

申请日：2016-06-09

Applicant: Apple Inc.

Inventor： Jae Hoon Kim ,  Xiaosong ZHOU ,  Sudeng Hu ,  Chris CHUNG ,  Dazhong ZHANG ,  Hsi-Jung WU

IPC: H04N19/59 ,  H04N19/61 ,  H04N19/167 ,  H04N19/182

CPC classification number: H04N19/59 ,  H04N19/103 ,  H04N19/124 ,  H04N19/132 ,  H04N19/146 ,  H04N19/167 ,  H04N19/176 ,  H04N19/182 ,  H04N19/187 ,  H04N19/31 ,  H04N19/33 ,  H04N19/61 ,  H04N19/85

Abstract: Video coding techniques are disclosed that can accommodate low bandwidth events and preserve visual quality, at least in areas of an image that have high significance to a viewer. Region(s) of interest may be identified from content of input frame that will be coded. Two representations of the input frame may be generated at different resolutions. A low resolution representation of the input frame may be coded according to predictive coding techniques in which a portion outside the region of interest is coded at higher quality than a portion inside the region of interest. A high resolution representation of the input frame may be coded according to predictive coding techniques in which a portion inside the region of interest is coded at higher quality than a portion outside the region of interest. Doing so preserves visual quality, at least in areas of the input image that correspond to the region of interest.

公开(公告)号：US20170347112A1

公开(公告)日：2017-11-30

申请号：US15168872

申请日：2016-05-31

Applicant: Apple Inc.

Inventor： Dazhong ZHANG ,  Jae Hoon KIM ,  Peikang SONG ,  Xiaosong ZHOU ,  Chris CHUNG ,  Hsi-Jung WU

IPC: H04N19/46 ,  H04L12/741 ,  H04L5/00 ,  H04L29/06 ,  H04N19/68

CPC classification number: H04N19/46 ,  H04L5/0055 ,  H04L45/745 ,  H04L65/602 ,  H04L65/607 ,  H04L65/608 ,  H04L65/80 ,  H04N19/68

Abstract: Coding and decoding techniques are disclosed in which a plurality of coding parameter sets is transmitted between an encoder and a decoder, each of which is distinguishable from the others by a respective identifier. When a new frame of video is to be coded, an encoder may identify a coding parameter set to be applied during coding, it may code the new frame according to the identified coding parameter set, and it may transmit the coded frame to the decoder along with an identifier of the coding parameter set used during the coding. A plurality of coding parameter sets is persistent at an encoder and the decoder simultaneously.