Electronics and Telecommunications Research Institute

Industry-university Cooperation Foundation Hanyang University

Markany Inc.

Korea Electronics Technology Institute

Euee Seon Jang

Min Soo Park

Eun Young Chang

So Won Kim

Ji Seop Moon

Ji Hun Cha

Sunyoung Lee

Sang Heon Lee

Sun Young Lee

Jae Young Ahn

Nam Ho Hur

Soo In Lee

Bon Ki Koo

Seung Wook Lee

Ji Young Park

Ji Hyung Lee

Hwa Seon Shin

Byeong Ho Choi

Ho Won Kim

Chang Woo Chu

Jin Seo Kim

Il Kyu Park

Young Jik Lee

Bon Woo Hwang

Seong Jae Lim

Kap Kee Kim

Jeung Chul Park

Yoon-Seok Choi

Hyun Gyu Kim

Kwan-Jung Oh

Kiho Choi

Kyu Tae Kim

Su Gil Choi

Gwangsoon Lee

Hyungyu Kim

Kun Tae Kim

You Sun Park

Kyoung Soo Son

Byeong Wook Min

Dai Yong Kim

Sikyoung Kim

Sin Wook Lee

Chung Ku Lee

Tian Yu Dong

Daiyong Kim

Byoungjun Kim

Jaebum Jun

Giseok Son

Min Ku Lee

A method of encoding an immersive video according to the present disclosure includes determining whether an input image is a first type, converting the input image into the first type when the input image is a second type different from the first type, encoding a converted image, and generating metadata for the encoded image.

Method for decoding immersive video and method for encoding immersive video

Provided is a method of compressing an occupancy map of a three-dimensional (3D) point cloud, and more specifically, a method of compressing an occupancy map of a point cloud in which an occupancy map image of a point cloud existing in a 3D space is compressed based on a compression quality or a patch-by-patch inspection method of the occupancy map image so that compression distortion is minimized when reconstructing the compressed occupancy map image so as to remarkably improve the quality of a reconstructed occupancy map image.

Method of compressing occupancy map of three-dimensional point cloud

There is provided a method of decoding point cloud data, the method comprising: decoding a bitstream to obtain attribute information of point cloud data, acquiring attributes of the point cloud data using the decoded attribute information and reconstructing the point cloud data using the obtained attributes, wherein the attribute information contains bit depth information of each attribute of the point cloud data.

3D point cloud data encoding/decoding method and apparatus

A method and apparatus for watermarking digital content and a data extraction method are disclosed. The digital content watermarking method includes: generating private and public keys corresponding to the user terminal; generating watermark data containing user identity information corresponding to the user terminal and user details associated with the watermark data; generating encrypted data by encrypting the watermark data and the user details with the private key; transmitting the watermark data, the encrypted data, and the public key to a server; receiving digital content when authorized by the server; and watermarking the digital content with the watermark data.

Method and apparatus for watermarking of digital content, method for extracting information

A method of inserting additional data into a moving image stream, according to some embodiments of the present invention, includes receiving a first coded bitstream, electing a first picture PA into which additional data is to be inserted from the first coded bitstream, generating a first picture PA' by inserting the additional data into the selected first picture PA, selecting a second picture PB directly referring to the first picture PA, generating a second picture PB&#x2032; by transforming and coding the selected second picture PB in a manner that decoding the second picture PB&#x2032; obtains the second picture PB with reference to the first picture PA&#x2032; and generating a data sequence based on the first picture PA&#x2032; and the second picture PB.

Method and apparatus for inserting additional data into video stream without degrading picture quality

Provided are an apparatus and a method for detecting a scene cut frame. The apparatus and a method for detecting a scene cut frame includes an image selector configured to select input images by n image frames while shifting an input image at h frame intervals; a candidate frame detector configured to detect a candidate frame from the selected n image frames using at least one of a plurality of codecs and a plurality of scene cut detecting algorithms; and a final frame detector configured to detect a frame having a count value higher than a threshold value as a final scene cut frame by performing histogram analysis based on the detected candidate frame, wherein the h and the n are a real number greater than zero and the h is smaller than the n.

Apparatus and method for detecting scene cut frame

Discrete cosine transform/inverse discrete cosine transform method and device are provided. The discrete cosine transform/inverse discrete cosine transform method includes: generating a table index for only an input value other than 0 (zero) out of input values of coordinates in an input block; reading one or more partial values corresponding to the table index out of a plurality of table information pieces which are generated and stored in advance so as to include partial values corresponding to a multiplication of a weight value and an index; and adding the read partial value and calculating the resultant value of each coordinate in an output block. Accordingly, it is possible to perform a fast DCT/IDCT operation and to reduce the energy consumption for the transform.

Method and apparatus for discrete cosine transform/inverse discrete cosine transform

Provided are a decoding apparatus and method. The decoding apparatus includes a repository and a configuration unit. The repository stores a plurality of functional units having an input port and an output port which are respectively represented as tokens. The configuration unit receives decoder description which includes an identifier of at least one of the functional units and connection relationship information between the functional units, selects each functional unit corresponding to the received identifier from the repository, and connects the selected functional units by using the token to configure a variable decoder. The decoding apparatus and method defines the connection relationships between a plurality of functional units that configure a decoder, and thus can quickly and dynamically configure a decoder suitable for various encoding schemes. Accordingly, the decoding apparatus and method enable to easily verify suitability in each level of encoding, decoding and standardization and achieve the concentration of information, thereby accelerating the progress and standardization of technologies.

Decoding apparatus, decoding method, and computer-readable storage medium

An apparatus for 3D mesh compression based on quantization, includes a data analyzing unit () for decomposing data of an input 3D mesh model into vertices information () property information () representing property of the 3D mesh model, and connectivity information () between vertices constituting the 3D mesh model: and a mesh model quantizing unit () for producing quantized vertices and property information of the 3D mesh model by using the vertices, property and connectivity information (). Further, the apparatus for 3D mesh compression based on quantization includes a decision bit encoding unit () for calculating a decision bit by using the quantized connectivity information and then encoding the quantized vertex information, property information and connectivity information () by using the decision bit.

Method and apparatus for real time 3D mesh compression, based on quanitzation

A method and apparatus for encoding and decoding three-dimensional mesh information are provided. The method and apparatus separately encode/decode order information of elements, such as vertices and faces, of a three-dimensional mesh model (original model) in consideration of a change in an element order during encoding three-dimensional mesh information for the original model. The method for encoding three-dimensional mesh information includes the steps of: encoding the three-dimensional mesh information and outputting an encoded bit-stream; calculating order information of at least one element in an original model contained in the three-dimensional mesh information; encoding the element order information; and generating packets of the encoded bit-stream, wherein the encoded element order information is inserted into the packet.

Method and apparatus for encoding/decoding 3D mesh information

Growing community of inventors

Seoul, South Korea

Euee Seon Jang