Title:
IMAGE ENCODING AND DECODING METHODS AND DEVICES
Document Type and Number:
WIPO Patent Application WO/2019/114713
Kind Code:
A1
Abstract:
Provided are an image encoding and decoding methods and devices. The encoding method comprises: use a target luma intra-prediction mode to perform intra-prediction on a luma component of a block to be encoded so as to obtain a luma component residual block; determining a first set of transform kernels according to a first mapping relationship between a plurality of preset luma intra-prediction modes and a plurality sets of transform kernels and the target luma intra-prediction mode, wherein the first mapping relationship is determined by prediction characteristics of the luma component residual block obtained according to the plurality of luma intra-prediction modes; and using the first set of transform kernels to perform transformation on the luma component residual block to obtain a first transformation coefficient of the luma component residual block. In the encoding method provided in an embodiment of the present invention, a first mapping relationship is used to determine a set of transform kernels for a luma component residual block, thereby reducing bit overheads incurred as a result of multiple transformations, and accordingly reducing complexity of intra-transformation.
Inventors:
ZHU CE (CN)
MAO MIN (CN)
LIN YONGBING (CN)
ZHENG JIANHUA (CN)
MAO MIN (CN)
LIN YONGBING (CN)
ZHENG JIANHUA (CN)
Application Number:
PCT/CN2018/120427
Publication Date:
June 20, 2019
Filing Date:
December 12, 2018
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H04N19/61
Domestic Patent References:
| WO2016143991A1 | 2016-09-15 | |||
| WO2017043941A1 | 2017-03-16 |
Foreign References:
| CN103098473A | 2013-05-08 | |||
| CN102918564A | 2013-02-06 | |||
| CN104067622A | 2014-09-24 | |||
| CN105791867A | 2016-07-20 |
Attorney, Agent or Firm:
LONGSUN LEAD IP LTD. (CN)
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