Samsung Electronics Co., Ltd.

Sk Telecom Company, Ltd.

Jechang Jeong

Jeongyeon Lim

Jinhan Song

Jae Moon Jo

Wooyoun Ahn

Byeungwoo Jeon

Kibaek Kim

Ju-ha Park

Byeung-Woo Jeon

Sunyeon Kim

Hyuk Jae Lee

Gyumin Lee

Jaehoon Choi

Sungtae Kim

Hyunsoo Shin

Joohan Kwon

Juha Park

Tae Young Jung

Kunho Yoo

The present disclosure relates to an adaptive scan apparatus and a method for scanning thereof. The adaptive scan apparatus includes a zero coefficient counter and a scan pattern updater. The scan pattern updater is configured to generate a zero counter corresponding to a prediction mode of a neighboring block of a current block and to update the zero counter corresponding to a position where a coefficient value of the current block is 0 for transformed and quantized data. And the scan pattern updater is configured to update a scan pattern by sequentially arranging generated zero counters updated for the current block from a position of a small value to a position of a large value.

Adaptive scan device and method for scanning thereof

A video encoding apparatus encodes intra-prediction mode information of the current block by excluding information on overlapping or unnecessary intra-prediction modes from a candidate mode group and/or based on whether predicted values of intra-prediction modes of at least a preset number of subblocks are matched with actual intra-prediction modes.

Method and apparatus for encoding/decoding images to minimize redundancy of intra-prediction mode

A method and apparatus for encoding and decoding an image in a spatial domain for noise components are provided. The method and apparatus generate a prediction block by predicting a current block, generate a residual block by subtracting the prediction block from the current block, decide whether the number of noise components of the residual block is in a predetermined range, determine a coding domain, when a determined coding domain is a frequency domain, transform quantize the residual block, when the determined coding domain is a spatial domain, quantize the residual block and encode information on the determined coding domain and a generated quantized block, or quantize the noise components and encode and decode information on quantized noise components, and a number and locations of the noise components.

Method and apparatus for encoding/decoding image in spatial domain for noise component

A method performed by a video encoding apparatus, includes: generating a predicted block by predicting a current block to be encoded; generating a residual block by subtracting the predicted block from the current block; encoding, into a bitstream, coding domain information indicating whether the residual block is encoded by a frequency domain coding or by a spatial domain coding; and encoding the residual block into the bitstream. Herein, the encoding of the residual block comprises: when the residual block is encoded by the frequency domain coding, transforming from a spatial domain into a frequency domain and quantizing the residual block, and encoding the transformed and quantized residual block; and when the residual block is encoded by the spatial domain coding, skipping transform for the residual block and quantizing the residual block, and encoding the quantized residual block.

A video encoding apparatus, a video decoding apparatus and video decoding method are provided. The video decoding apparatus includes:

Method and apparatus for encoding/decoding image for performing intraprediction using pixel value filtered according to prediction mode

A video encoding apparatus, a decoding apparatus and method thereof by using feature vectors of at least one neighboring block are provided. In the video encoding apparatus, the decoding apparatus and the method, the feature vector is extracted from pixels of at least one neighboring block, and an optimal prediction mode represented by the feature vector is extracted with reference to a preset feature vector distribution of image blocks. The extracted optimal prediction mode is decided as a most probable mode (MPM) or an intra mode of a current block, and the current block is intra-predicted and encoded or decoded by using pixels of the at least one neighboring block adjacent to the current block.

Method and device for encoding/decoding image using feature vectors of surrounding blocks

The present disclosure provides a video encoding apparatus and encoding method thereof, video decoding apparatus and decoding method thereof, and directional intra-prediction method to be used therefor. The video encoding apparatus includes a main mode search unit for searching for main mode for a current block from among directional intra-prediction modes; a sub mode search unit for searching for sub modes formed by inclining indicated orientation of found main mode by main mode search unit by a predetermined offset in both clockwise and counterclockwise directions; a predicted block generator for generating predicted block of the current block from neighboring blocks of the current block based on found main mode by the main mode search unit and found sub modes by the sub mode search unit; a differentiator for calculating differential between the current block and the predicted block; and an encoder for encoding calculated differential by the differentiator.

Video encoding device and encoding method thereof, video decoding device and decoding method thereof, and directional intra-prediction method to be used thereto

An adaptive variable-length coding/decoding method performs an optimal variable-length coding and decoding depending on an intra mode/inter mode condition, quantization step size and a current zigzag scanning position, such that a plurality of variable-length coding tables having different patterns of a regular region and an escape region according to statistical characteristics of the run level data are set. One of the variable-length coding tables is selected according to mode, quantization step size and scanning position, and the orthogonal transform coefficients according to the selected variable-length coding table are variable-length-coded.

Adaptive variable-length coding and decoding methods for image data

An adaptive variable-length coding/decoding method performs an optimal variable-length coding and decoding depending on an intro mode/inter mode condition, quantization step size and a current zigzag scanning position, such that a plurality of variable-length coding tables having different patterns of a regular region and an escape region according to statistical characteristics of the run level data are set. One of the variable-length coding tables is selected according to mode, quantization step size and scanning position, and the orthogonal transform coefficients according to the selected variable-length coding table are variable-length-coded.

A method for motion estimation includes steps for constructing a first image segment representing a portion of present image frame and a second image segment having a plurality of image segments of an adjacent frame, comparing said plurality of image segments of said second image segment with the image signal within the first image segment, and generating a number of error values, detecting a first motion vector at one scale of resolution using the generated error values, outputting the error value associated with a reference segment pointed by the first motion vector, and the error values corresponding to the reference segment shifted by one unit of selected resolution respectively in selected direction(s), generating a second motion vector in finer scale of resolution using the output error values, and summing the first and second motion vectors.

Method and apparatus for motion estimation

A variable length encoding/decoding apparatus using symbol-codeword re-association of a variable length code table includes a re-associator for storing symbol-address assignment information, address-codeword assignment information and address-counter-value assignment information, altering the symbol-address assignment information and the address-counter value assignment information according to the varied counter value due to the symbol identifying and outputting a variable length code table in which a symbol-codeword is re-associated to the encoder/decoder apparatus, and a controller for producing the initialized counter values based on probabilities of symbol occurrences belonging to the pre-defined variable length code table and the information stored in the re-associator based on the pre-defined updating unit, and storing the symbol-codeword re-associated variable length code table every predetermined updating unit in the encoder/decoder. A data compression efficiency can be improved even though global statistics corresponding to the pre-defined variable length code table and local statistics of the symbols/codewords which are actually variable-length-encoded/decoded do not match each other. Since it is not necessary to transmit the symbol-codeword re-association information at the encoding end to a decoding end, threre is no additional data to be transmitted by employing the present invention.

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Seoul, South Korea

Jechang Jeong