KR-20260065784-A - METHOD AND APPARATUS FOR PROCESSING A VIDEO SIGNAL

KR20260065784AKR 20260065784 AKR20260065784 AKR 20260065784AKR-20260065784-A

Abstract

The image decoding method according to the present invention may include the steps of determining whether bidirectional intra prediction is applied to a current block, deriving a reference sample of the current block, and, when bidirectional intra prediction is applied to the current block, obtaining a prediction sample of the current block based on a first reference sample and a second reference sample specified by an intra prediction mode of the current block.

Inventors

이배근

Assignees

주식회사 케이티

Dates

Publication Date: 20260511
Application Date: 20260427
Priority Date: 20170908

Claims (4)

A step of determining the intra-prediction mode of the current block, wherein the current block corresponds to the execution unit of the intra-prediction; A step of obtaining first prediction samples for the current block by performing the intra prediction for the current block based on the intra prediction mode; and The above-mentioned intra-prediction mode includes a step of determining whether to extend it bidirectionally, When the above intra-prediction mode is expanded bidirectionally, correction is performed on the first prediction samples belonging to the first region within the current block, whereas correction is not performed on those belonging to the second region within the block, and The first prediction sample belonging to the first region is modified based on a reference sample located in the reverse direction of the intra prediction mode, and An image decoding method characterized in that the above modification is performed using a weight that is variably determined according to the position of the first prediction sample.
In Article 1, A video decoding method characterized in that the size of each of the first region and the second region within the current block is adaptively determined according to the intra prediction mode of the current block.
A step of obtaining first prediction samples for the current block by performing intra prediction on the current block based on the intra prediction mode of the current block, wherein the current block corresponds to the unit of execution of the intra prediction; and The above-mentioned intra-prediction mode includes a step of determining whether to extend it bidirectionally, When the above intra-prediction mode is expanded bidirectionally, correction is performed on the first prediction samples belonging to the first region within the current block, whereas correction is not performed on those belonging to the second region within the block, and The first prediction sample belonging to the first region is modified based on a reference sample located in the reverse direction of the intra prediction mode, and An image encoding method characterized in that the above modification is performed using a weight that is variably determined according to the position of the first prediction sample.
A step of obtaining first prediction samples for the current block by performing an intra prediction on the current block based on an intra prediction mode of the current block, wherein the current block corresponds to a unit for performing the intra prediction; and The above-mentioned intra-prediction mode includes a step of determining whether to extend it bidirectionally, When the above intra-prediction mode is expanded bidirectionally, correction is performed on the first prediction samples belonging to the first region within the current block, whereas correction is not performed on those belonging to the second region within the block, and The first prediction sample belonging to the first region is modified based on a reference sample located in the reverse direction of the intra prediction mode, and A computer-readable recording medium storing a bitstream generated by an image encoding method, characterized in that the above modification is performed using a weight that is variably determined according to the position of the first prediction sample.

Description

Method and apparatus for processing a video signal The present invention relates to a video signal processing method and apparatus. Recently, the demand for high-resolution, high-quality video, such as HD (High Definition) and UHD (Ultra High Definition) video, has been increasing across various application fields. As video data becomes higher in resolution and quality, the relative volume of data increases compared to conventional video data; consequently, transmission and storage costs increase when video data is transmitted using existing wired or wireless broadband lines or stored using conventional storage media. To address these issues arising from the increase in video data resolution and quality, high-efficiency video compression technologies can be utilized. Various video compression technologies exist, such as inter-frame prediction technology that predicts pixel values in the current picture from previous or subsequent pictures, intra-frame prediction technology that predicts pixel values in the current picture using pixel information within the current picture, and entropy coding technology that assigns short codes to values with high frequency and long codes to values with low frequency; by utilizing these video compression technologies, video data can be effectively compressed for transmission or storage. Meanwhile, along with the increasing demand for high-resolution video, the demand for stereoscopic video content as a new video service is also rising. Discussions are underway regarding video compression technologies to effectively provide high-resolution and ultra-high-resolution stereoscopic video content. FIG. 1 is a block diagram showing an image encoding device according to an embodiment of the present invention. FIG. 2 is a block diagram showing an image decoding device according to an embodiment of the present invention. FIG. 3 illustrates an example of hierarchically dividing coding blocks based on a tree structure as an embodiment to which the present invention is applied. FIG. 4 is a diagram showing a partition shape that allows binary tree-based partitioning as an embodiment to which the present invention is applied. FIG. 5 is a diagram illustrating an example in which the present invention is applied, wherein only a specific type of binary tree-based partitioning is allowed. FIG. 6 is a diagram illustrating an example in which information related to the number of times a binary tree is allowed is encoded/decoded as an embodiment to which the present invention is applied. FIG. 7 is a diagram illustrating a partition mode that can be applied to a coding block as an embodiment to which the present invention is applied. FIG. 8 illustrates a type of intra-prediction mode pre-defined in an image encoder/decoder as an embodiment to which the present invention is applied. FIG. 9 illustrates a type of extended intra-prediction mode as an embodiment to which the present invention is applied. FIG. 10 is a flowchart schematically illustrating an intra-prediction method as an embodiment to which the present invention is applied. FIG. 11 illustrates a method for correcting a prediction sample of a current block based on difference information of surrounding samples as an embodiment to which the present invention is applied. Figures 12 and 13 are diagrams showing a one-dimensional reference sample group in which reference samples are rearranged in a row. FIG. 14 is a diagram showing an example of deriving a right reference sample or a bottom reference sample using multiple reference samples. FIGS. 15 and 16 are drawings for explaining how to determine a right reference sample and a bottom reference sample for a non-square block according to an embodiment of the present invention. FIG. 17 is a diagram illustrating an example of deriving a second reference sample using a first reference sample. FIG. 18 is a diagram illustrating reference samples that constitute a one-dimensional reference sample group. Figure 19 is an example showing an area where bidirectional intra-prediction is applied. Figure 20 is an example illustrating a directional prediction mode in which bidirectional intra-prediction is allowed. FIG. 21 is a flowchart illustrating an intra prediction method of the current block based on a bidirectional intra prediction mode according to the present invention. The present invention is susceptible to various modifications and may have various embodiments; specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. Similar reference numerals have been used for similar components in the description of each drawing. Terms such as "first," "second," etc., may be used to describe various components, but said com