US 2018/0295363 A1 · IMAGE DECODING METHOD AND APPARATUS IN IMAGE CODING SYSTEM

Abstract

An image decoding method performed by a decoding apparatus according to the present invention comprises the steps of: generating a reconstruction area for a target area within a current picture; deriving a predetermined plurality of basic filters for the target area; updating at least one basic filter among the plurality of basic filters; receiving weight information for each of the basic filters; determining a merge filter for the target area on the basis of the basic filters and the weight information; and generating a modified reconstruction area by performing filtering on the target area on the basis of the filter coefficient of the determined merge filter. The present invention allows updating with filter information suitable for improving the visual quality of the target area and can thereby improve the accuracy of filtering and overall coding efficiency.

Claims9

Dependent claims

A video decoding method performed by a video decoding apparatus, comprising steps of:

obtaining high frequency (HF) filtering information through a bitstream;
deriving a frequency domain reconstructed block by performing frequency transform on a reconstructed block of a current block in a spatial domain;
deriving a low frequency component of the frequency domain reconstructed block based on low pass filtering for the frequency domain reconstructed block;
deriving a high frequency component of the frequency domain reconstructed block based on the frequency domain reconstructed block and the low frequency component of the frequency domain reconstructed block;
filtering the high frequency component based on the HF filtering information;
deriving a modified frequency domain reconstructed block based on the filtered high frequency component and the low frequency component;
and
deriving a modified reconstructed block of the spatial domain for the current block based on frequency inverse transform for the modified frequency domain reconstructed block.

5 more elements

Dependencies are inferred from the claim text.

Image decoding method and apparatus in image coding system

Life of this patent

Image decoding method and apparatus in image coding system

Life of this patent

Abstract

Claims9