Abstract: Disclosed herein is a method for decoding image information including obtaining the image information including supplemental enhancement information (SEI) processing order information indicating a processing order for a group of types of SEI messages, and determining the processing order based on the SEI processing order information, wherein the SEI processing order information includes payload type information indicating a type of an SEI message, prefix present information indicating whether prefix information of the SEI message is present or not, and processing order information indicating the processing order for the type of the SEI message, and wherein the SEI processing order information further includes parallel processing enable information indicating whether at least two SEI messages having a same processing order in the SEI processing order information is invoked in parallel or not.

Abstract: An image encoding/decoding method, a method of transmitting a bitstream and a recording medium storing a bitstream are provided. The image decoding method may comprise receiving a neural-network post-filter (NNPF) related supplemental enhancement information (SEI) message to be applied to a current picture, reconstructing NNPF related information based on the NNPF related SEI message, and applying an NNPF to the current picture based on the NNPF related information. The NNPF related SEI message may include a neural-network post-filter characteristics (NNPFC) SEI message including filter identification information and filter property present information, and the NNPFC SEI message may further include base filter present information specifying whether the NNPFC SEI message includes a base neural-network post-processing filter.

Abstract: An image decoding method including obtaining a neural network post-filter (NNPF) group (NNPFG) characteristics (NNPFGC) supplemental enhancement information (SEI) message specifying information related to a group of two or more NNPFs to be applied to image data; obtaining a first list of output images that are output by one or more of the two or more NNPFs; obtaining a number of output images of the first list that are to be included in a final output of images; based on the obtained number being greater than zero, setting one or more indicators for the output images indicating whether each output image is to be included in the final output of images; and based on the first list and the one or more indicators, generating a second list of images that are to be output in the final output of images.

Abstract: An image decoding method includes: acquiring a neural-network post-filter characteristics (NNPFC) SEI message and a neural-network post-filter activation (NNPFA) SEI message; based on the NNPFC SEI message, determining at least one neural network which may be used as a neural-network post-processing filter; and based on the NNPFA SEI message, determining whether to activate a target neural-network post-processing filter that may be applied to the current picture. The NNPFA SEI message includes target identification information and target basic flag information of the target neural-network post-processing filter, the target neural-network post-processing filter is determined based on the target identification information and the target basic flag information, and based on that the target basic flag information does not indicate the target neural-network post-processing filter is a basic neural-network post-processing filter, at least one NNPFC SEI message is present before the NNPFA SEI in decoding order.

Abstract: An image encoding/decoding method and device are provided. A video decoding method according to the present disclosure comprises the steps of: receiving a bitstream including video information; and generating a reconstructed picture by restoring the current picture on the basis of the image information, wherein the image information may include a post-filter hint SEI message regarding a post-filter to be applied to the reconstructed picture.

Abstract: Transmission device of point cloud data, method performed by transmission device, reception device of point cloud data and method performed by reception device are provided. According to an embodiment of the present disclosure, a method performed by a reception device of point cloud data comprises obtaining a geometry-based point cloud compression (G-PCC) file including the point cloud data and reconstructing the point cloud based on temporal scalability information, wherein the temporal scalability information may comprise first information on a temporal level track of the G-PCC file, and the first information may specify a constraint on the temporal level track based on a sample entry type.

Abstract: According to an embodiment of the present disclosure, a method for decoding image information includes obtaining the image information including at least one primary picture layer among a plurality of layers and at least one object mask information (OMI) related message associated with the at least one primary picture layer, respectively; and processing the at least one OMI related message. An OMI related message among the at least one OMI related message is associated with only a current primary picture layer among the at least one primary picture layer.

Abstract: A method according to embodiments may include acquiring a Supplemental Enhancement Information (SEI) message for one or more pictures, and decoding the one or more pictures. A method according to embodiments may include deriving an SEI message for one or more pictures, and encoding one or more pictures.

Abstract: An image decoding method including obtaining a neural network post-filter (NNPF) group (NNPFG) characteristics supplemental enhancement information (SEI) message specifying information related to a group of two or more NNPFs to be applied to image data; determining a grouping type of the group of the two or more NNPFs based on the message; based on the grouping type indicating that only one of the group of the two or more NNPFs is to be selected to be applied, or that the group of the two or more NNPFs are to be applied in parallel, obtaining a value corresponding to a purpose of each of the group of the two or more NNPFs; and applying at least one of the group of the two or more NNPFs to the image data based the obtained value.

Abstract: According to an embodiment of the present disclosure, a method for decoding image information includes obtaining the image information including supplemental enhancement information (SEI) messages, a SEI processing order message indicating a processing order for a group of types of the SEI messages, and a processing order nesting message including at least one nested SEI message in a processing chain specified by the SEI processing order message, and deriving the processing order of the SEI messages based on the SEI processing order message. The SEI processing order message includes wrapping flag information indicating whether a SEI message in a processing chain specified by the SEI processing order message is included in the processing order nesting message.

Abstract: A method according to the embodiments may include acquiring Supplemental Enhancement Information (SEI) messages for pictures, decoding the pictures, wherein the SEI messages may contain processing order information related to a group of types of the SEI messages. A method according to the embodiments may include deriving SEI messages for pictures, and encoding the pictures, wherein the SEI messages may contain processing order information related to a group of types of the SEI messages.

Abstract: A method according to embodiments may include acquiring a supplemental enhancement information (SEI) message for source pictures, and decoding output pictures related to the source pictures. A method according to embodiments may include acquiring source pictures, generating an SEI message for the source pictures, and encoding output pictures related to the source pictures.

Abstract: Provided are an image encoding/decoding method, a bitstream transmission method, and a computer-readable recording medium storing a bitstream. The image decoding method according to the present disclosure comprises the steps of: acquiring post-filter-based output picture information for an input picture from a neural-network post-filter (NNPF)-related supplemental enhancement information (SEI) message; and on the basis of the output picture information, acquiring an output picture for the input picture, wherein the output picture information may include output picture output information which is information indicating whether or not the output picture for the input picture is output.

Abstract: An image encoding/decoding method, a bitstream transmission method, and a computer-readable recording medium on which a bitstream is stored are provided.

Abstract: An image encoding/decoding method, a bitstream transmission method, and a computer-readable recording medium for storing a bitstream are provided. The image decoding method according to the present disclosure may be an image decoding method performed by an image decoding device, the method comprising the steps of: obtaining a supplemental enhancement information (SEI) message for an extended dependent random access point (EDRAP) picture from a bitstream, and on the basis of the SEI message, identifying a leading picture following the EDRAP picture in the decoding order and preceding the EDRAP picture in the output order, wherein the leading picture comprises at least one of a decodable leading picture and an undecodable leading picture.

Abstract: An image encoding/decoding method, a method of transmitting a bitstream and a computer-readable recording medium storing a bitstream are provided. An image decoding method may comprise obtaining unit information including a current picture and coding the current picture based on the unit information. A type of the current picture may be restricted based on a neural-network post-filter (NNPF)-related supplemental enhancement information (SEI) message included in the unit information.

Abstract: An image encoding/decoding method, a method of transmitting a bitstream and a computer-readable recording medium storing a bitstream are provided. The image encoding method may comprise encoding first information indicating whether at least one output picture corresponding to at least one input picture is generated from an NNPFC (neural-network post-filter characteristics) SEI (supplemental enhancement information) message and encoding second information indicating whether the generated output picture is output from an NNPFA (neural-network post-filter activation) SEI message. A value of the second information may be determined based on at least one of whether a purpose of an NNPF (neural-network post-filter) is picture rate upsampling or whether the number of input pictures is multiple.

Abstract: An image encoding/decoding method, a method of transmitting a bitstream and a computer-readable recording medium storing a bitstream are provided. The image encoding method may comprise encoding first information indicating whether at least one output picture corresponding to at least one input picture is generated from an NNPFC (neural-network post-filter characteristics) SEI (supplemental enhancement information) message and encoding second information indicating whether the generated output picture is output from an NNPFA (neural-network post-filter activation) SEI message. A value of the second information may be determined based on at least one of whether a purpose of an NNPF (neural-network post-filter) is picture rate upsampling or whether the number of input pictures is multiple.

Abstract: A method and a device for image encoding/decoding are provided. An image decoding method according to the present disclosure may comprise the steps of: in response to a random-access request for a first picture, acquiring a second picture which is associated with the first picture and has been decoded before the first picture; and decoding the first picture by referring to the second picture, wherein the first picture is a dependent random-access point picture, and the second picture is gradual coding refresh (GDR) picture having a zero-recovery point picture.

Abstract: A method according to embodiments may include: acquiring a Supplemental Enhancement Information (SEI) message for pictures; acquiring a list for the SEI message; generating a processing chain for decoding of the pictures; acquiring a list for the pictures; and decoding the pictures. A method according to embodiments may include: deriving a Supplemental Enhancement Information (SEI) message for pictures; generating a list for the SEI message; generating a processing chain for decoding of the pictures; deriving a list for the pictures; and encoding the pictures.