Abstract: A method of decoding video data using motion information, the method includes extracting quantized coefficient components and inter prediction information from bitstream; generating a quantization block having a size of transform unit by inverse-scanning the quantized coefficient components; generating quantization parameter, and inverse-quantizing the quantization block using the quantization parameter; generating a residual block by inverse-transforming the inverse-quantized quantization block; deriving the motion information, and generating a prediction block using the motion information; generating a reconstructed block using the residual block and the prediction block; and applying deblocking filtering on a picture which is reconstructed using the reconstructed block, wherein the step of generating the quantization block includes: generating a plurality of subsets by inverse-scanning the quantized coefficient components when the size of the transform unit is larger than 4×4; and generating the quantizati

Abstract: A method is provided for encoding video data in uni-directional prediction by a coding apparatus. The coding apparatus determines a reference picture index and a motion vector of a current block, generates a prediction block of the current block using the reference picture index and the motion vector, generates a residual block using the current block and the prediction block, transforms the residual block to generated a transformed block, quantizes the transformed block using a quantization parameter and a quantization matrix to generate a quantized block, scans coefficient components of the quantized block using a diagonal scan, and entropy-codes the scanned coefficient components of the quantized block. Prediction pixels of the prediction block are generated using an interpolation filter selected based on the motion vector.

Abstract: A method of decoding video data using a merge mode can include constructing a merge list using available spatial and temporal merge candidates; determining a merge candidate on the merge list corresponding to a merge index as motion information of a current prediction unit; generating a predicted block of the current prediction unit using the motion information; generating a transformed block by inverse-quantizing a block of quantized coefficients using a quantization parameter; generating a residual block by inverse-transforming the transformed block; and generating a reconstructed block using the predicted block and the residual block, in which the merge list contains a predetermined number of merge candidates among the available spatial and temporal merge candidates, the quantization parameter is derived per a quantization unit, a minimum size of the quantization unit is adjusted per picture, and the quantization parameter is derived using a differential quantization parameter and a quantization parameter

Abstract: An apparatus of encoding an image can include an intra prediction unit that determines an intra prediction mode of a current prediction unit and generates one or more prediction blocks using the intra prediction mode, an inter prediction unit that determines motion information and generates a prediction block using the motion information, a transform unit that transforms residual signals generated using an original block and the prediction block to generate a transformed block, a quantization unit that determines a quantization parameter and quantizes the transformed block using a quantization matrix and the quantization parameter to generate a quantized block, a scanning unit that determines a scan pattern and applies the scan pattern to the quantized block to generate one-dimensional coefficient information, and an entropy coding unit the entropy-codes one-dimensional coefficient information from the scanning unit, intra prediction information from the intra prediction unit, and motion information from the

Abstract: An apparatus is provided for decoding video data in a merge mode. The apparatus comprises an inter prediction unit configured to derive motion information of a current coding unit and generate a prediction block using the motion information, wherein the motion information is derived using a merge index and a merge candidate list constructed using available spatial and temporal merge candidates. The apparatus further comprises an inverse-quantizing unit configured to inverse-quantize a quantized block by using a quantization parameter, an inverse transform unit configured to generate a residual block by inverse-transforming the inverse-quantized block, and an adder configured to generate a reconstruct block by adding the residual block and the prediction block.

Abstract: An image decoding method using a merge mode can include constructing a merge candidate list using available spatial and temporal merge candidates, obtaining motion information using a merge index and the merge candidate list, deriving a prediction block using the motion information, inverse-quantizing a quantized block using a quantization parameter and a quantization matrix to generate a transform block, and inverse-transforming the transform block to generate a residual block, and generating a reconstructed block using the prediction block and the residual block.

Abstract: An apparatus of encoding an image in an advanced motion vector prediction (AMVP) mode can include an inter prediction module for determining motion information of a current block, and generating a prediction block of the current block using the motion information; a transform module for transforming the residual block to generate a transformed block; a quantization module for quantizing the transformed block using a quantization parameter and a quantization matrix to generate a quantized block; a scanning module for scanning quantized coefficient components of the quantized block; and an entropy coding module for entropy-coding the scanned quantized coefficient components of the quantized block; in which the motion information is encoded by performing the sub-steps of: constructing an AMVP list using available motion vector candidates of a left motion vector candidate, an above motion vector candidate and a temporal motion vector candidate; selecting a motion vector predictor among motion vector candidates of

Abstract: A method of encoding video data in a merge mode can include determining motion information of a current block; generating a prediction block of the current block using the motion information; generating a residual block using the current block and the prediction block; transforming the residual block to generate a transformed block; quantizing the transformed block using a quantization parameter and a quantization matrix to generate a quantized block; scanning coefficient components of the quantized block using a diagonal scan; entropy-coding the scanned coefficient components of the quantized block; and encoding the motion information, in which when the current block is a second prediction unit partitioned by asymmetric partitioning, the spatial merge candidate corresponding to a first prediction unit partitioned by the asymmetric partitioning is not to be listed on the merge list, the quantization parameter is determined per a quantization unit and is encoded using a quantization parameter predictor, and a

Abstract: An image coding method includes generating a prediction block using intra prediction mode or motion information, transforming residual signals generated using an original block and the prediction block to generate a transformed block, quantizing the transformed block using a quantization parameter to generate a quantized block, determining a scan pattern and applying the scan pattern to the quantized block to generate one-dimensional coefficient information, and entropy-coding the one-dimensional coefficient information, wherein a transform type used for transforming the residual signals of luma components is DCT-based integer transform if prediction mode is inter prediction, and a transform type used for transforming the residual signals of chroma components is a DCT-based integer transform.

Abstract: An apparatus for encoding an image in intra prediction can include an intra prediction unit generating a prediction block using an intra prediction mode; a transform unit transforming residual signals generated using an original block and the prediction block to generate a transformed block; a quantization unit determining a quantization parameter and quantizing the transformed block using a quantization matrix and the quantization parameter to generate a quantized block; a scanning unit determining a scan pattern and applying the scan pattern to the quantized block to generate one-dimensional coefficient information; and an entropy coding unit entropy-coding the one-dimensional coefficient information and the intra prediction mode, in which the residual signals are transformed in a transform unit, DST-based integer transforms are used for transforming the residual signals if the size of the transform unit is smaller than a predetermined size, and DCT-based transforms are used if the size of the transform uni

Abstract: An apparatus for post-processing a reconstructed image is discussed.

Abstract: An apparatus is provided for encoding an image in an advanced motion vector prediction (AMVP) mode. The apparatus includes an inter prediction unit configured to determine motion information of a current block, and generating a prediction block of the current block using the motion information, a transform unit configured to transform the residual block to generated a transformed block, a quantization unit configured to quantize the transformed block using a quantization parameter and a quantization matrix to generate a quantized block, a scanning unit configured to for scan quantized coefficient components of the quantized block, and an entropy coding unit configured to perform entropy-coding on the scanned coefficient components of the quantized block. The quantization parameter is determined per a quantization unit and is encoded using a quantization parameter predictor. The quantization parameter predictor is generated by averaging two quantization parameters.

Abstract: A method of decoding video data, the method including deriving a luma intra prediction mode and chroma intra prediction mode; determining a size of a luma transform unit and a size of a chroma transform unit; generating a reference pixel if at least one reference pixel is unavailable; generating prediction blocks of the current luma block and a current chroma block using the adaptively filtered reference pixels; and generating reconstructed block adding the prediction blocks with residual blocks, further the luma intra prediction mode is derived using a most probable mode (MPM) group including three intra prediction modes, a mode group indicator and a luma prediction mode index, also the luma prediction mode index indicates one of the three intra prediction mode in the MPM group as the luma intra prediction mode when the mode group indicator indicates the MPM group.

Abstract: A method of encoding video data in a merge mode can include determining motion information of a current block; generating a prediction block of the current block using the motion information; generating a residual block using the current block and the prediction block; transforming the residual block to generate a transformed block; quantizing the transformed block using a quantization parameter and a quantization matrix to generate a quantized block; scanning coefficient components of the quantized block using a diagonal scan; entropy-coding the scanned coefficient components of the quantized block; and encoding the motion information, in which when the current block is a second prediction unit partitioned by asymmetric partitioning, the spatial merge candidate corresponding to a first prediction unit partitioned by the asymmetric partitioning is not to be listed on the merge list, the quantization parameter is determined per a quantization unit and is encoded using a quantization parameter predictor, and a

Abstract: A method is provided for deriving an intra prediction mode for a current prediction unit. The method includes entropy decoding a mode group indicator and a prediction mode index, constructing a most probable mode (MPM) group using intra prediction modes of a left block and an above block, wherein the MPM group includes three intra prediction modes, determining whether the mode group indicator indicates the MPM group, determining an intra prediction mode specified by the prediction mode index among the three intra prediction modes in the MPM group as the intra prediction mode of the current prediction unit when the mode group indicator indicates the MPM group, and deriving the intra prediction mode of the current prediction unit using the prediction mode index and the three intra prediction modes in the MPM group when the mode group indicator does not indicate the MPM group.

Abstract: A method for decoding chroma image can include deriving a chroma intra prediction mode of a prediction unit; determining a size of a current chroma block using luma transform size information; generating a chroma prediction block of the current chroma block using the chroma intra prediction mode; generating a chroma residual block of the current chroma block using the chroma intra prediction mode and a chroma quantization parameter; and generating a chroma reconstructed block adding the chroma prediction block and the chroma residual block, in which the chroma quantization parameter is generated using a luma quantization parameter determined per quantization unit and information indicating the relationship between the luma quantization parameter and the chroma quantization parameter, the size of the quantization unit is one of allowable sizes of a coding unit, and a minimum size of the quantization unit is determined per picture and a parameter for specifying the minimum size of the quantization unit is inclu

Abstract: An image encoding apparatus can include an inter prediction module for determining motion information of a current block, and generating a prediction block of the current block using the motion information; a transform module for transforming the residual block to generate a transformed block; a quantization module for quantizing the transformed block using a quantization parameter and a quantization matrix to generate a quantized block; a scanning module for scanning coefficient components of the quantized block using a diagonal scan; and an entropy coding module for entropy-coding the scanned coefficient components of the quantized block; in which the motion information is encoded by performing the sub-steps of: constructing a merge list using available spatial and temporal merge candidates; selecting a merge predictor among merge candidates of the merge list; and encoding a merge index specifying the merge predictor, in which if the current block is a second prediction unit partitioned by asymmetric partit

Abstract: A method of image decoding can include generating a quantization block by inversely scanning quantization coefficient information; generating a transform block by inversely quantizing the quantization block using a quantization step size; generating a residual block by inversely transforming the transform block; reconstructing an intra prediction mode group indicator and a prediction mode index of a current block; constructing a first group including three intra prediction modes using valid intra prediction modes of left and top blocks of the current block; determining the intra prediction mode corresponding to the prediction mode index in the first group as the intra prediction mode of the current block when the intra prediction mode group indicator indicates the first group; generating a prediction block on the basis of the determined intra prediction mode of the current block; and generating a reconstructed block using the residual block and the prediction block.

Abstract: A method for generating a prediction block in intra prediction can include restoring a mode group indicator and a prediction mode index; constructing a most probable mode (MPM) group including three intra prediction modes of a current block; determining an intra prediction mode specified by the intra prediction mode index in the MPM group as the intra prediction mode of the current block if the mode group indicator indicates the MPM group, and deriving the intra prediction mode of the current block using the prediction mode index and the three intra prediction modes of the MPM group if the mode group indicator does not indicate the MPM group; determining a size of the prediction block based on transform size information; determining whether all reference pixels of the current block are available; generating reference pixels if one or more reference pixels of the current block are unavailable; adaptively filtering the reference pixels based on the intra prediction mode and the size of the current block; and ge

Abstract: A reconstructed block creating method is provided which includes decoding an intra prediction mode using an intra prediction mode group indicator and a prediction mode index, constructing a prediction block, inversely quantizing a received residual signal using a quantization parameter and adaptively inversely transforming the residual signal using the intra prediction mode to create a residual block, and adding the prediction block and the residual block to create a reconstructed block. The quantization parameter is reconstructed using a minimum quantization CU size, and the minimum quantization CU size is determined by a parameter transmitted from a picture parameter set. Therefore, it is possible to improve image quality by adaptively adjusting a quantization parameter of a current block depending on the size of a coding unit and enhance compression efficiency of an image by effectively encoding/decoding the quantization parameter.