Title:
METHOD AND APPARATUS FOR NON-LINEAR ADAPTIVE LOOP FILTERING IN VIDEO CODING
Document Type and Number:
WIPO Patent Application WO/2020/151714
Kind Code:
A1
Abstract:
Methods and apparatus for Adaptive Loop Filter (ALF) processing of reconstructed video are disclosed. According to one method, clipping values for the ALF processing are determined depending on a bit depth of a center reconstructed pixel. A current ALF output for the current block is derived, where the current ALF output comprises a weighted sum of clipped differences of original differences and each of the original differences is calculated between a first reconstructed pixel at a non-center filter location and the center reconstructed pixel, and each of the original differences is clipped according to a corresponding clipping value to form one clipped difference. In another method, a target clipping value is always signaled at an encoder side or parsed at a decoder side even if the target clipping value is zero. In another method, the clipping values are encoded or decoded using a fixed-length code.
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Inventors:
LAI CHEN-YEN (CN)
CHEN CHING-YEH (CN)
CHUANG TZU-DER (CN)
HUANG YU-WEN (CN)
CHEN CHING-YEH (CN)
CHUANG TZU-DER (CN)
HUANG YU-WEN (CN)
Application Number:
PCT/CN2020/073567
Publication Date:
July 30, 2020
Filing Date:
January 21, 2020
Export Citation:
Assignee:
MEDIATEK INC (CN)
International Classes:
H04N19/117; H04N19/176
Domestic Patent References:
| WO2019010267A1 | 2019-01-10 | |||
| WO2017201011A1 | 2017-11-23 |
Foreign References:
| US20180184128A1 | 2018-06-28 | |||
| US20180270479A1 | 2018-09-20 | |||
| TW201828708A | 2018-08-01 | |||
| US20180091812A1 | 2018-03-29 |
Other References:
J. TAQUET (CANON), C. GISQUET (CANON), G. LAROCHE (CANON), P. ONNO (CANON),: "Non-Linear Adaptive Loop Filter", 13. JVET MEETING; 20190109 - 20190118; MARRAKECH; (THE JOINT VIDEO EXPLORATION TEAM OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ), 12 January 2019 (2019-01-12), pages 1 - 5, XP030201784
J. TAQUET ET AL.: "Non-Linear Adaptive Loop Filter", JOINT VIDEO EXPLORATION TEAM (JVET) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11, 13TH MEETING: MARRAKECH, MA, 9-18 JAN. 2019, 9 January 2019 (2019-01-09)
A. KOTRA ET AL.: "Non-CE: Loop filter line buffer reduction", JOINT VIDEO EXPLORATION TEAM (JVET) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11, 13TH MEETING: MARRAKECH, MA, 9-18 JAN. 2019, 9 January 2019 (2019-01-09)
CHEN H. ET AL.: "Description of SDR, HDR and 360° video coding technology proposal by Huawei, GoPro, HiSilicon, and Samsung", JVET MEETING, SAN DIEGO, 10 - 20 APRIL 2018, 10 April 2019 (2019-04-10)
See also references of EP 3915253A4
J. TAQUET ET AL.: "Non-Linear Adaptive Loop Filter", JOINT VIDEO EXPLORATION TEAM (JVET) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11, 13TH MEETING: MARRAKECH, MA, 9-18 JAN. 2019, 9 January 2019 (2019-01-09)
A. KOTRA ET AL.: "Non-CE: Loop filter line buffer reduction", JOINT VIDEO EXPLORATION TEAM (JVET) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11, 13TH MEETING: MARRAKECH, MA, 9-18 JAN. 2019, 9 January 2019 (2019-01-09)
CHEN H. ET AL.: "Description of SDR, HDR and 360° video coding technology proposal by Huawei, GoPro, HiSilicon, and Samsung", JVET MEETING, SAN DIEGO, 10 - 20 APRIL 2018, 10 April 2019 (2019-04-10)
See also references of EP 3915253A4
Attorney, Agent or Firm:
BEIJING SANYOU INTELLECTUAL PROPERTY AGENCY LTD. (CN)
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