Abstract: Provided is a method that de-multiplexes a bit stream to extract intra prediction mode information and residual signals, restores an intra prediction mode of a current prediction unit using the intra prediction information and intra prediction modes of prediction units adjacent to the current prediction unit, generates reference pixels using one or more available reference pixel if there exist unavailable reference pixels of the prediction unit, adaptively filters the reference pixels based on the restored intra prediction mode, generates a prediction block using the restored intra prediction mode and the reference pixels, decodes the residual signal to generating a residual block, and generates a reconstructed block using the prediction block and the residual block. Accordingly, additional bits resulted from increase of a number of intra prediction mode are effectively reduced. Also, an image compression ratio can be improved by generating a prediction block similar to an original block.

Abstract: Provided is a method that de-multiplexes a bit stream to extract intra prediction mode information and residual signals, restores an intra prediction mode of a current prediction unit using the intra prediction information and intra prediction modes of prediction units adjacent to the current prediction unit, generates reference pixels using one or more available reference pixel if there exist unavailable reference pixels of the prediction unit, adaptively filters the reference pixels based on the restored intra prediction mode, generates a prediction block using the restored intra prediction mode and the reference pixels, decodes the residual signal to generating a residual block, and generates a reconstructed block using the prediction block and the residual block. Accordingly, additional bits resulted from increase of a number of intra prediction mode are effectively reduced. Also, an image compression ratio can be improved by generating a prediction block similar to an original block.

Abstract: Provided is an apparatus for encoding a moving picture that determines a quantization step size of a previous coding block according to scan order as the quantization step size predictor of the current coding block when a quantization step size of a left coding block of a current coding block and a quantization step size of an above coding block of the current coding block are unavailable and determines an available motion vector encountered first when retrieving motion vectors in the order of motion vector of a first predetermined position and motion vector of a second predetermined position in a reference picture as a temporal motion vector candidate. Therefore, it is possible to reduce the amount of coding bits required to encode motion information and the quantization step size of the current prediction block.

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: Provided is a method that de-multiplexes a bit stream to extract intra prediction mode information and residual signals, restores an intra prediction mode of a current prediction unit using the intra prediction information and intra prediction modes of prediction units adjacent to the current prediction unit, generates reference pixels using one or more available reference pixel if there exist unavailable reference pixels of the prediction unit, adaptively filters the reference pixels based on the restored intra prediction mode, generates a prediction block using the restored intra prediction mode and the reference pixels, decodes the residual signal to generating a residual block, and generates a reconstructed block using the prediction block and the residual block. Accordingly, additional bits resulted from increase of a number of intra prediction mode are effectively reduced. Also, an image compression ratio can be improved by generating a prediction block similar to an original block.

Abstract: Provided is a method that de-multiplexes a bit stream to extract intra prediction mode information and residual signals, restores an intra prediction mode of a current prediction unit using the intra prediction information and intra prediction modes of prediction units adjacent to the current prediction unit, generates reference pixels using one or more available reference pixel if there exist unavailable reference pixels of the prediction unit, adaptively filters the reference pixels based on the restored intra prediction mode, generates a prediction block using the restored intra prediction mode and the reference pixels, decodes the residual signal to generating a residual block, and generates a reconstructed block using the prediction block and the residual block. Accordingly, additional bits resulted from increase of a number of intra prediction mode are effectively reduced. Also, an image compression ratio can be improved by generating a prediction block similar to an original block.

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: Provided is an apparatus for encoding a moving picture that determines a quantization step size of a previous coding block according to scan order as the quantization step size predictor of the current coding block when a quantization step size of a left coding block of a current coding block and a quantization step size of an above coding block of the current coding block are unavailable and determines an available motion vector encountered first when retrieving motion vectors in the order of motion vector of a first predetermined position and motion vector of a second predetermined position in a reference picture as a temporal motion vector candidate. Therefore, it is possible to reduce the amount of coding bits required to encode motion information and the quantization step size of the current prediction block.

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: Provided is a method that de-multiplexes a bit stream to extract intra prediction mode information and residual signals, restores an intra prediction mode of a current prediction unit using the intra prediction information and intra prediction modes of prediction units adjacent to the current prediction unit, generates reference pixels using one or more available reference pixel if there exist unavailable reference pixels of the prediction unit, adaptively filters the reference pixels based on the restored intra prediction mode, generates a prediction block using the restored intra prediction mode and the reference pixels, decodes the residual signal to generating a residual block, and generates a reconstructed block using the prediction block and the residual block. Accordingly, additional bits resulted from increase of a number of intra prediction mode are effectively reduced. Also, an image compression ratio can be improved by generating a prediction block similar to an original block.

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 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: Provided is an apparatus for encoding a moving picture that determines a quantization step size of a previous coding block according to scan order as the quantization step size predictor of the current coding block when a quantization step size of a left coding block of a current coding block and a quantization step size of an above coding block of the current coding block are unavailable and determines an available motion vector encountered first when retrieving motion vectors in the order of motion vector of a first predetermined position and motion vector of a second predetermined position in a reference picture as a temporal motion vector candidate. Therefore, it is possible to reduce the amount of coding bits required to encode motion information and the quantization step size of the current prediction block.

Abstract: Provided is a method that de-multiplexes a bit stream to extract intra prediction mode information and residual signals, restores an intra prediction mode of a current prediction unit using the intra prediction information and intra prediction modes of prediction units adjacent to the current prediction unit, generates reference pixels using one or more available reference pixel if there exist unavailable reference pixels of the prediction unit, adaptively filters the reference pixels based on the restored intra prediction mode, generates a prediction block using the restored intra prediction mode and the reference pixels, decodes the residual signal to generating a residual block, and generates a reconstructed block using the prediction block and the residual block. Accordingly, additional bits resulted from increase of a number of intra prediction mode are effectively reduced. Also, an image compression ratio can be improved by generating a prediction block similar to an original block.

Abstract: Provided is a method that de-multiplexes a bit stream to extract intra prediction mode information and residual signals, restores an intra prediction mode of a current prediction unit using the intra prediction information and intra prediction modes of prediction units adjacent to the current prediction unit, generates reference pixels using one or more available reference pixel if there exist unavailable reference pixels of the prediction unit, adaptively filters the reference pixels based on the restored intra prediction mode, generates a prediction block using the restored intra prediction mode and the reference pixels, decodes the residual signal to generating a residual block, and generates a reconstructed block using the prediction block and the residual block. Accordingly, additional bits resulted from increase of a number of intra prediction mode are effectively reduced. Also, an image compression ratio can be improved by generating a prediction block similar to an original block.