Samsung Electronics Co., Ltd.

Seoul National University

Ki-won Yoo

Sang-kwon Na

Jae-moon Kim

Sang-kyun Kim

Young-sik Huh

Du-sik Park

Chang-su Han

Chang-yeong Kim

Sung-dae Kim

Hyung-Ju Chun

Soo-ik Chae

Jae-Hyun Kim

Kyo-hyuk Lee

Sung-Oh Kim

Chan-sik Park

Woo-seok Jeong

Soon-woo Choi

Seong-deok Lee

Du-Sik Park

Tae-gyoung Ahn

Doo-hyun Kim

Jae-hun Lee

Myung-ho Kim

Chan-Sik Park

Yong-hoon Yu

Won-hee Choi

Wook-seok Jeong

Jae-Moon Kim

Sung-Dae Kim

Chang-Su Han

Provided is a video decoding method including obtaining a residue of a first bit-depth with respect to a current block by decoding a bitstream; when intra predicting the current block, generating a prediction block of the current block by using a block that is previously decoded at the first bit-depth and then stored in a buffer; and generating a reconstruction block of the first bit-depth by using the prediction block and the residue of the first bit-depth. When the current block is inter predicted, the video decoding method may further include generating a prediction block of a second bit-depth by using an image previously decoded at the second bit-depth, and generating the prediction block of the current block by changing the generated prediction block of the second bit-depth to the first bit-depth. The first bit-depth is higher than the second bit-depth.

Video encoding method and apparatus therefor, and video decoding method and apparatus therefor

Provided is a video decoding method for reconstructing an image, the video decoding method including: obtaining reference image data from a bitstream; determining an attribute of the reference image data as a long-term reference attribute or a short-term reference attribute, according to a frequency of referring to the reference image data by image data to be decoded; storing the reference image data in a memory by using the attribute of the reference image data; and decoding an image by using the reference image data stored in the memory.

Video encoding/decoding method and device for controlling reference image data according to reference frequency

Provided are a method and apparatus for determining a merge mode by using motion information of a previous prediction unit. The method of determining a merge mode includes obtaining a merge mode cost of a lower depth based on a merge mode cost of a coding unit of an upper depth obtained by using motion information of a merge mode of the coding unit of the upper depth corresponding to a merge mode of the coding unit of the lower depth.

Method and apparatus for determining merge mode

A video encoding apparatus comprises an encoder encoding input video; a decoder decoding video data, and a filter to compensate for a pixel value of the encoded video data. An adaptive loop filter (ALF) parameter predictor generates an ALF filter parameter using the decoded video data. The ALF filter parameter is applied to an ALF filter to compensate a current pixel by using a pixel adjacent to the current pixel and a filter coefficient with respect to the neighboring pixel; a sample adaptive offset (SAO) filter unit applied to the decoded video data compensates for a current pixel by using at least one of an edge offset and a band offset; an ALF filter unit applies the ALF filter parameter, the ALF filter to video data to which the SAO filter has been applied; and an entropy encoder performs entropy encoding on the ALF filter parameter.

Video encoding method using in-loop filter parameter prediction and apparatus therefor, and video decoding method and apparatus therefor

A processing apparatus has a processor including a first memory. The processor divides a frame in video content into a plurality of coding units (CUs), and encodes the plurality of CUs in a diagonal direction to generate an encoded frame, wherein when a first CU is encoded based on a first encoding type, the processor is further configured to load, from a second memory, a first partial region of a reference frame corresponding to first position information of the first CU to the first memory and encode the first CU based on the first partial region of the reference frame loaded from the second memory, and wherein, when the first CU is encoded based on a second encoding type, the processor is further configured to encode the first CU based on a first reference pixel value corresponding to the first position information of the first CU from the first memory.

Processing apparatuses and controlling methods thereof

A video encoder and decoder are described. The encoder operates on luma data and chroma data. The luma data is split into two channels. The channel split can be based on frequency regions or based on even and odd lines. When the channel split is based on frequency regions, the encoder produces a channel with low frequency data and a channel with high frequency data. A third channel holds chroma data. The decoder recovers the split luma data and the third channel of chroma data. The decoder may then generate one or more pixels to be stored in a line buffer.

Image decoding method and device therefor, and image encoding method and device therefor

Provided is a video encoding method including: performing padding outside an input image such that a size of the input image is a multiple of a maximum coding unit; when a current maximum coding unit includes a padding area generated via the padding, determining a coding unit by splitting the current maximum coding unit by using a boundary of the input image and the padding area; determining information indicating whether a coding unit included in the padding area includes a nonzero coefficient to be 0; and encoding a bitstream including the determined information.

Video encoding and decoding methods and apparatuses for padding area of image

A video decoding method includes obtaining a motion vector of a current block belonging to a first picture from a bitstream, performed by a first decoding unit; determining whether a reference block indicated by the motion vector is decoded, performed by the first decoding unit; and decoding the current block, based on whether the reference block is decoded. The reference block is included in a second picture decoded by a second decoding unit. The first picture and the second picture are decoded in parallel.

Method and apparatus for parallel video decoding based on multi-core system

A video encoding method includes: receiving an image; up-sampling the received image; and changing a sample value of an up-sampling region included in the up-sampled image and encoding the up-sampled image by using the changed sample value, wherein the up-sampling region is a region inserted into the received image by the up-sampling.

Video decoding method and apparatus and video encoding method and apparatus

An image encoding method includes generating symbols by performing transformation and quantization according to a transformation block, on a block that performs prediction according to a prediction mode; updating a probability index of a current sub block by using a probability index of a previous sub block among sub blocks included in the transformation block; determining a rate according to a bit length of the current sub block by using the probably index; determining a rate of the transformation block by using rates of the sub blocks; determining a distortion by using a difference between an original image and a reconstruction image according to transformation and quantization; and determining a rate-distortion (R-D) cost by using the distortion and the rate.

Video encoding method and apparatus and video decoding method and apparatus

Provided are a method and an apparatus for decoding an image by accessing a memory by a block group. The method comprises checking information regarding a size of one or more blocks included in a bitstream of an encoded image, determining whether to group one or more blocks for performing decoding, based on the information regarding the size of the one or more blocks, setting a block group including one or more blocks based on the information regarding the size of the one or more blocks, and accessing a memory by the block group to perform a parallel-pipeline decoding process by the block group.

Enhanced data processing apparatus employing multiple-block based pipeline and operation method thereof

Provided is a video encoding method including: calculating a difference value between a rate-distortion (R-D) cost of a first coefficient level from among coefficient levels of a sub-block and an R-D cost of a second coefficient level adjacent to the first coefficient level by using a distortion difference calculated by using an integer of the first coefficient level and an integer of the second coefficient level and a rate variation between the first coefficient level and the second coefficient level; selecting one of the integer values of the first and second coefficient levels as a modified value of the first coefficient level based on the difference value; and outputting the modified value of the first coefficient level.

Rate-distortion optimization-based quantization method and apparatus

Provided are a method and a device for encoding a video to improve an intra prediction processing speed, and a method and a device for decoding the video. The method for encoding a video performs parallel intra prediction and includes: obtaining, by using pixels of peripheral blocks processed prior to a plurality of adjacent blocks, reference pixels used for intra prediction of each of the plurality of adjacent blocks; performing, by using the obtained reference pixels, intra prediction in parallel for each of the plurality of adjacent blocks; and adding reference pixel syntax information to a bitstream.

Method and device for encoding video to improve intra prediction processing speed, and method and device for decoding video

Provided are a method and apparatus for encoding a video and a method and apparatus for decoding a video. The method of encoding includes: determining, for a current block, bidirectional motion estimation information comprising an Lmotion vector, an Lmotion vector, an Lreference vector, and an Lreference picture by performing bidirectional motion estimation on the current block; determining whether to use the determined bidirectional motion estimation information as prediction information of the current block based on whether the Lreference picture and the Lreference picture are the same and based on a difference value between the Lmotion vector and the Lmotion vector; and in response to determining to use the determined bidirectional motion estimation information as the prediction information of the current block, encoding the determined bidirectional motion estimation information as the prediction information of the current block.

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Seoul, South Korea

Ki-won Yoo