KR-102962166-B1 - Image or video coding based on chroma quantization parameter offset information

Abstract

According to the disclosure of this document, information related to chroma quantization parameter offsets is signaled through palette coding syntax, and index information for the chroma quantization parameter offset list can be efficiently parsed/signaled based on information regarding the number of entries in the chroma quantization parameter offset list. Accordingly, bits that need to be signaled for video/image coding can be saved and coding efficiency can be improved.

Inventors

• 헨드리헨드리
• 김승환
• 자오지에

Assignees

• 엘지전자 주식회사

Dates

Publication Date

20260508

Application Date

20201105

Priority Date

20191105

Claims (20)

1. In an image decoding method performed by a decoding device, A step of obtaining image information including information on chroma quantization parameter offsets from a bitstream; A step of deriving chroma quantization parameters for the current block based on information regarding the chroma quantization parameter offset above; and The method includes the step of generating a reconstructed sample by performing palette coding for the current block based on the chroma quantization parameters, The information regarding the above chroma quantization parameter offset includes index information for the chroma quantization parameter offset list, and The above image information includes palette coding syntax, and An image decoding method characterized in that the above palette coding syntax includes information regarding the chroma quantization parameter offset based on information regarding the number of entries in the chroma quantization parameter offset list and flag information regarding whether the chroma quantization parameter offset list is used to derive the value of the chroma quantization parameter offset.
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11. In a video encoding method performed by an encoding device, A step of deriving a chroma quantization parameter offset for the current block; A step of generating information about the chroma quantization parameter offset; and The method includes the step of encoding image information containing information about the chroma quantization parameter offset, wherein The information regarding the above chroma quantization parameter offset includes index information for the chroma quantization parameter offset list, and The above image information includes palette coding syntax, and A video encoding method characterized in that the above palette coding syntax includes information regarding the chroma quantization parameter offset based on information regarding the number of entries in the chroma quantization parameter offset list and flag information regarding whether the chroma quantization parameter offset list is used to derive the value of the chroma quantization parameter offset.
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19. In a computer-readable non-transient storage medium storing a bitstream generated by a video encoding method, the method comprises: A step of deriving a chroma quantization parameter offset for the current block; A step of generating information about the chroma quantization parameter offset; and The method includes the step of encoding image information containing information about the chroma quantization parameter offset, wherein The information regarding the above chroma quantization parameter offset includes index information for the chroma quantization parameter offset list, and The above image information includes palette coding syntax, and A computer-readable non-transient storage medium characterized in that the above palette coding syntax includes information regarding the chroma quantization parameter offset based on information regarding the number of entries in the chroma quantization parameter offset list and flag information regarding whether the chroma quantization parameter offset list is used to derive the value of the chroma quantization parameter offset.
20. In a method for transmitting data regarding an image, Acquiring a bitstream of video information, wherein the bitstream is generated based on the steps of deriving a chroma quantization parameter offset for a current block, generating information about the chroma quantization parameter offset, and encoding video information including the information about the chroma quantization parameter offset; and The method includes the step of transmitting the data including the bitstream of the image information, The information regarding the above chroma quantization parameter offset includes index information for the chroma quantization parameter offset list, and The above image information includes palette coding syntax, and A transmission method characterized in that the above palette coding syntax includes information regarding the chroma quantization parameter offset based on information regarding the number of entries in the chroma quantization parameter offset list and flag information regarding whether the chroma quantization parameter offset list is used to derive the value of the chroma quantization parameter offset.

Description

Image or video coding based on chroma quantization parameter offset information This technology relates to video or image coding, for example, to coding technology based on chroma quantization parameter offset information. Recently, the demand for high-resolution, high-quality video, such as 4K or 8K or higher UHD (Ultra High Definition) video, is increasing across various fields. As video data becomes higher resolution and higher quality, the amount of information or bits transmitted increases relative to existing video data; therefore, when transmitting video data using media such as existing wired or wireless broadband lines or storing video data using existing storage media, transmission and storage costs increase. In addition, interest in and demand for immersive media such as VR (Virtual Reality), AR (Artificial Reality) content, and holograms have recently been increasing, and the broadcasting of video content with characteristics different from reality, such as game footage, is on the rise. Accordingly, high-efficiency image/video compression technology is required to effectively compress, transmit, store, and play back high-resolution, high-quality image/video information having various characteristics as described above. Furthermore, measures are needed to effectively signal image/video information and improve coding efficiency, and to this end, a method is required to effectively signal information related to chroma quantization parameters. Figure 1 schematically illustrates an example of a video/image coding system that can be applied to embodiments of the present document. FIG. 2 is a diagram schematically illustrating the configuration of a video/image encoding device to which embodiments of the present document can be applied. FIG. 3 is a diagram schematically illustrating the configuration of a video/image decoding device to which embodiments of the present document can be applied. Figure 4 shows an example of a schematic video/image encoding procedure to which the embodiment(s) of this document are applicable. Figure 5 shows an example of a schematic video/image decoding procedure to which the embodiment(s) of this document are applicable. FIG. 6 schematically illustrates an example of an entropy encoding method to which the embodiments of the present document are applicable, and FIG. 7 schematically illustrates an entropy encoding section within an encoding device. FIG. 8 schematically illustrates an example of an entropy decoding method to which the embodiments of the present document are applicable, and FIG. 9 schematically illustrates an entropy decoding unit within a decoding device. Figure 10 illustrates an exemplary hierarchical structure for a coded image/video. Figure 11 is a diagram illustrating an example of a palette mode-based coding method. FIGS. 12 and 13 schematically illustrate an example of a video/image encoding method and related components according to the embodiment(s) of the present document. FIGS. 14 and 15 schematically illustrate an example of a video/image decoding method and related components according to the embodiment(s) of the present document. FIG. 16 shows an example of a content streaming system to which the embodiments disclosed in this document can be applied. As this document is subject to various modifications and may have various embodiments, specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit this document to specific embodiments. Terms used in this document are used merely to describe specific embodiments and are not intended to limit the technical scope of this document. Singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "comprising" or "having" in this document are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the document, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Meanwhile, each component in the drawings described in this document is depicted independently for the convenience of explaining different characteristic functions and does not imply that each component is implemented in separate hardware or separate software. For example, two or more components may be combined to form a single component, or a single component may be divided into multiple components. Embodiments in which each component is integrated and/or separated are also included within the scope of this document, provided that they do not deviate from the essence of this document. In this document, "A or B" may mean "only A," "only B," or "both A and B." Alternatively, in this document, "A or B" may be interpreted as "A and/or B." For example, in this document, "A, B or C" may mean "only A," "only B," "only C," or "any combination of A, B and C." The