Lg Electronics Inc.

Xiaomi Inc.

Samsung Electronics Co., Ltd.

Korea Advanced Institute of Science and Technology

Hendry Hendry

Byeongmoon Jeon

Chulkeun Kim

Jungsun Kim

Joonyoung Park

Yongjoon Jeon

Seethal Paluri

Jaehyun Lim

Seungwook Park

Seunghwan Kim

Naeri Park

Jie Zhao

Sangoh Jeong

Seung Hwan Kim

Junghak Nam

Nae Ri Park

Byeong Moon Jeon

Seung Wook Park

Joon Young Park

Jae Hyun Lim

Yong Joon Jeon

Jaewon Sung

Jung Sun Kim

Younghee Choi

Young Hee Choi

Chul Keun Kim

Hyeong Moon Jang

Hyeongmoon Jang

Jung Hak Nam

Jinpil Kim

Kyungho Kim

Jong Yeul Suh

Jin Won Lee

Ki-Ho Jung

Young-Joo Song

Mun-Churl Kim

Sang Oh Jeong

Seoungwook Park

Seunghawan Kim

Jaehyung Lim

Beyongmoon Jeon

An image decoding method performed by a decoding apparatus, according to the present document, comprises the steps of: acquiring image information including decoded picture buffer (DPB) parameter information for output layer sets (OLSs) and an OLS DPB parameter index for a target OLS; and deriving DPB parameter information for the target OLS from among the DPB parameter information for the OLSs on the basis of the OLS DPB parameter index.

Image decoding method comprising DPB management process and apparatus therefor

Proposed in an image decoding method according to the present disclosure is indication information regarding whether an adaptive loop filter (ALF) procedure to be applied to a current block is applied at a picture level or at a slice level.

Video or image coding employing adaptive loop filter

A deblocking filtering method, a boundary strength (bS) deriving method, and encoding/decoding method and apparatus using the methods are provided. The bS deriving method includes the steps of: deriving a boundary of a deblocking filtering unit block which is a unit block on which deblocking filtering is performed; and setting a bS for each bS setting unit block in the deblocking filtering unit block. Here, the step of setting the bS includes setting a bS value of a target boundary corresponding to the boundary of the deblocking filtering unit block as the bS setting unit block.

Method and apparatus for encoding/decoding image information

A video decoding method performed by a video decoding device according to the present document may comprise the steps of: acquiring image information from a bitstream, the image information including a picture header associated with the current picture including a plurality of slices; parsing, from the picture header, at least one of a first flag indicating whether information necessary for an inter-prediction operation for a decoding process is present in the picture header, or a second flag indicating whether information necessary for an intra-prediction operation for the decoding process is present in the picture header; generating prediction samples by performing at least one of intra-prediction or inter-prediction for the slices in the current picture on the basis of at least one of the first flag or the second flag; and generating reconstructed samples on the basis of the prediction samples.

Method and device for processing image information for image/video coding

An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure may comprise obtaining a first flag specifying whether a network abstraction layer (NAL) hypothetical reference decoder (HRD) parameter is present in a bitstream and a second flag specifying whether a video coding layer (VCL) HRD parameter is present in the bitstream, obtaining a third flag specifying whether a temporal distance between output times of consecutive pictures in the bitstream has a fixed value, deriving output times of the pictures in the bitstream, based on at least one of the first flag, the second flag or the third flag, and processing the pictures in the bitstream based on the derived output times. Based on the first flag having a second value specifying that the NAL HRD parameter is not present in the bitstream and the second flag having a second value specifying that the VCL HRD parameter is not present in the bitstream, it may be constrained that the third flag has a first value specifying that the temporal distance between the output times of the consecutive pictures in the bitstream has a fixed value.

Image encoding/decoding method and apparatus for signaling picture output timing information, and computer-readable recording medium storing bitstream

An inter predication method is provided. The method includes: generating a merging candidate list of a block to be predicted and corresponding to a current prediction unit (PU); deriving motion information of the block to be predicted, on the basis of one of a plurality of merging candidates constituting the merging candidate list; and performing a prediction on the block to be predicted, on the basis of the derived motion information, to generate a prediction block corresponding to the current PU.

Inter prediction method and apparatus therefor

An image encoding/decoding method and apparatus is provided. An image decoding method performed by an image decoding apparatus comprises determining reference availability of the parameter set for decoding the image coding data and decoding the image coding data based on the reference availability.

Image encoding/decoding method and apparatus for determining whether or not to refer to parameter set on basis of output layer set, and method for transmitting bitstream

According to the disclosure of the present document, image information acquired via a bitstream includes POC information, and a non-reference picture flag related to whether a picture is not used as a reference picture. A POC value of a current picture is derived on the basis of the POC information, and the POC information includes POC information of a previous picture in decoding order for the current picture. The previous picture in the decoding order for deriving the POC value of the current picture may be limited to a picture where a value of the non-reference picture flag is 0. Accordingly, an incorrect POC value can be prevented from being derived in video/image coding.

Image coding method based on POC information and non-reference picture flag in video or image coding system

Disclosed herein are a method and apparatus for generating/receiving a media file supporting random access in sample units and a method of transmitting a media file. The media file receiving method may comprise obtaining one or more tracks and sample groups from the media file and processing the video data in the media file by reconstructing a sample included in the track based on the sample group. Based on that samples mapped to a stream access point sample group of a predetermined type or a random access recovery point sample group are present in the track, a current sample among the mapped samples may be constrained to include at least one intra random access point (IRAP) subpicture, and a sample belonging to the same coded layer video sequence (CLVS) as the current sample and following the current sample in decoding order may be constrained to include at least one IRAP subpicture with the same subpicture index value as the non-IRAP subpicture, based on the current sample including a non-IRAP subpicture.

Media file generation/reception method and apparatus supporting random access in units of samples, and method for transmitting media file

A media file generating/receiving method and apparatus for signaling operating point information and a method of transmitting a media file are provided. A media file receiving method comprises obtaining operating point information of video data from a media file and processing the video data based on the obtained operating point information. The obtaining the operating point information may comprise obtaining first information specifying a number of output layer sets for the video data, obtaining second information on the output layer sets based on the first information, obtaining third information specifying a number of operating points for the output layer sets, and obtaining fourth information on output layer sets associated with the operating points based on the third information.

Method and device for generating/receiving media file including output layer set information, and method for transmitting media file

Disclosed are a method and device for transmitting/receiving a downlink channel from multiple transmission/reception points in a wireless communication system. A method for a terminal to receive a downlink channel in a wireless communication system according to an embodiment of the present disclosure comprises the steps of: receiving a downlink control channel on the basis of two or more transmission configuration indicator (TCI) states associated with one or more control resource sets (CORESETs); and receiving a downlink data channel on the basis of the two or more TCI states associated with one or more CORESETs, on the basis of TCI information not being included in downlink control information (DCI) received through the downlink control channel, wherein the two or more TCI states may be mapped to the downlink data channel on the basis of a prescribed mapping scheme.

Method and apparatus for generating and processing media file

An image encoding/decoding method and apparatus are provided. The image decoding method comprises obtaining, from a bitstream, video coding layer (VCL) network abstraction layer (NAL) unit type information of a current picture and first flag information specifying whether a subpicture included in the current picture is treated as one picture, determining a NAL unit type of each of a plurality of slices included in the current picture, based on the obtained VCL NAL unit type information, and decoding the plurality of slices based on the determined NAL unit type and the first flag information. The current picture may comprise two or more subpictures based on at least some of the plurality of slices having different NAL unit types, and the first flag information may have a predetermined value specifying that each of the two or more subpictures is treated as one picture based on at least some of the plurality of slices having different NAL unit types.

Mixed NAL unit type-based image encoding/decoding method and device, and method for transmitting bitstream

Disclosed herein are a method and apparatus for generating/receiving a media file including NAL unit information and a method of transmitting a media file. A media file receiving method may comprise obtaining network abstraction layer (NAL) unit information of video data from a decoder configuration record in a media file and processing the video data based on the NAL unit information. The NAL unit information may comprise first information specifying a number of NAL units having a NAL unit type indicated in the decoder configuration record, for a stream to which the decoder configuration record is applied, and based on the indicated NAL unit type being a predetermined non-video coding layer (non-VCL) NAL unit type, obtaining of the first information may be skipped.

Method and device for generating/receiving media file including NAL unit information, and method for transmitting media file

According to the disclosures of the present document, entry point-related information/parameter can be signaled by means of upper-level syntax, thereby allowing the amount of data necessary to be signaled for video/image coding to be reduced and coding efficiency to be increased.

Image coding method on basis of entry point-related information in video or image coding system

A media file generation method according to the present document comprises the steps of: configuring first flag information about a target layer in an OLS, the first flag information indicating information about whether the maximum number of temporal sub-layers for inter-layer prediction exists; configuring second flag information about whether the target layer is an output layer; configuring the information about the maximum number of temporal sub-layers on the basis of the first flag information and the second flag information; and generating a media file including an operating point information sample group, wherein the information about the maximum number of temporal sub-layers is configured in the operating point information sample group on the basis of the first flag information being the same as 1 and the second flag information being the same as 0.

Media file processing method and apparatus therefor

Growing community of inventors

Seoul, South Korea

Hendry Hendry