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公开(公告)号：US10757428B2
公开(公告)日：2020-08-25
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: H04N19/33 , H04N19/186 , H04N19/51 , H04N19/136 , H04N19/12
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.
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公开(公告)号：US20180352264A1
公开(公告)日：2018-12-06
申请号：US15612806
申请日：2017-06-02
Applicant: Apple Inc.
Inventor： Mei Guo , Feng Yi , Jun Xin , Chris Y. Chung , Yeping Su , Xiaosong Zhou , Jun Xu , Hsi-Jung Wu , Jingteng Xue
IPC: H04N19/86 , H04N19/117
CPC classification number: H04N19/86 , H04N19/117 , H04N19/159
Abstract: Methods of in-loop deblocking filter for high dynamic range (HDR) video compression are disclosed. HDR processing and standard dynamic range (SDR) processing adopt different electro-optical transfer function (EOTF) to convert digital code words to linear luminance. For compressing HDR video, EOTF is proposed to be involved in the selection of two deblocking parameters, β and tC, which control the strength of deblocking filter. In local activity checking for filter decisions, the calculated local signal characteristics and the thresholds are adjusted according to EOTF. After deblocking filter, the clipping range is modified based on EOTF. The chroma deblocking filter is also extended to inter-inter block boundary.
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公开(公告)号：US10212456B2
公开(公告)日：2019-02-19
申请号：US15612806
申请日：2017-06-02
Applicant: Apple Inc.
Inventor： Mei Guo , Feng Yi , Jun Xin , Chris Y. Chung , Yeping Su , Xiaosong Zhou , Jun Xu , Hsi-Jung Wu , Jingteng Xue
IPC: H04N19/86 , H04N19/117 , H04N19/159
Abstract: Methods of in-loop deblocking filter for high dynamic range (HDR) video compression are disclosed. HDR processing and standard dynamic range (SDR) processing adopt different electro-optical transfer function (EOTF) to convert digital code words to linear luminance. For compressing HDR video, EOTF is proposed to be involved in the selection of two deblocking parameters, β and tC, which control the strength of deblocking filter. In local activity checking for filter decisions, the calculated local signal characteristics and the thresholds are adjusted according to EOTF. After deblocking filter, the clipping range is modified based on EOTF. The chroma deblocking filter is also extended to inter-inter block boundary.
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公开(公告)号：US20170353704A1
公开(公告)日：2017-12-07
申请号：US15611636
申请日：2017-06-01
Applicant: Apple Inc.
Inventor： Yeping Su , Chris Chung , Hsi-Jung Wu , Xiaosong Zhou , Jun Xin , Jun Xu
Abstract: Embodiments of the present disclosure provide techniques for environment aware supervised HDR tone mapping. According to those techniques, responsive to metadata provided with HDR source video data, the received metadata may be compared to sensor date representing viewing conditions at a display device. Tone mapping corrections to the HDR source video data may be derived from the comparison of the received metadata to the sensor data. The HDR source video data may be altered based on the tone mapping corrections. The altered HDR source video data may be used to drive the display device.
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