Title:
IMAGE ENCODING DEVICE, IMAGE ENCODING METHOD AND PROGRAM, IMAGE DECODING DEVICE, IMAGE DECODING METHOD, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2021/054011
Kind Code:
A1
Abstract:
The purpose of the present invention is to adaptively correct a quantization parameter used for a quantization process and reduce the possibility of unnecessary increasing of a code amount. To this end, an image encoding device according to the present invention: encodes a block to be encoded by using a second quantization parameter obtained by correcting a first quantization parameter, when the block to be encoded is determined to be predictively encoded and the coefficient of each color component of the block to be encoded is not determined to be orthogonally transformed; and encodes the block to be encoded by using the second quantization parameter, when the block to be encoded is determined to be palette-encoded and pixels inside the block to be encoded are determined to be escape-encoded. Here, the present invention derives the second quantization parameter by performing prescribed determination on the basis of the first quantization parameter and a prescribed value, and correcting the first quantization parameter according to the result of the prescribed determination.
Inventors:
SHIMA MASATO (JP)
Application Number:
PCT/JP2020/030903
Publication Date:
March 25, 2021
Filing Date:
August 14, 2020
Export Citation:
Assignee:
CANON KK (JP)
International Classes:
H04N19/126; H04N19/157; H04N19/176
Foreign References:
| JP2018532319A | 2018-11-01 | |||
| JP2016103804A | 2016-06-02 | |||
| JP2019168859A | 2019-10-03 |
Other References:
TAKESHI TSUKUBA ET AL.: "CE8-3.2: Chroma Transform Skip", JOINT VIDEO EXPERTS TEAM (JVET) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11, JVET- 00081-V2, 15TH MEETING, July 2019 (2019-07-01), Gothenburg, SE, pages 1 - 10, XP030218591
JIE ZHAO ET AL.: "Non-CE8: Minimum QP for Palette Escape Coding", JVET-P0460, 16THMEETING:, October 2019 (2019-10-01), Geneva, CH, pages 1 - 4, XP030206517
YUNG-HSUAN CHAO ET AL.: "Non-CE8: Minimum QP for escape mode in palette", JOINT VIDEO EXPERTS TEAM (JVET) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/ WG 11, JVET-P0474, 16TH MEETING, September 2019 (2019-09-01), Geneva, CH, pages 1 - 3, XP030206540
See also references of EP 4033761A4
JIE ZHAO ET AL.: "Non-CE8: Minimum QP for Palette Escape Coding", JVET-P0460, 16THMEETING:, October 2019 (2019-10-01), Geneva, CH, pages 1 - 4, XP030206517
YUNG-HSUAN CHAO ET AL.: "Non-CE8: Minimum QP for escape mode in palette", JOINT VIDEO EXPERTS TEAM (JVET) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/ WG 11, JVET-P0474, 16TH MEETING, September 2019 (2019-09-01), Geneva, CH, pages 1 - 3, XP030206540
See also references of EP 4033761A4
Attorney, Agent or Firm:
OHTSUKA PATENT OFFICE, P.C. (JP)
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