Abstract: A method for encoding an image using intra prediction can include determining an intra prediction mode of a current block, generating a mode group indicator and a prediction mode index specifying the intra prediction mode of the current block, constructing a most probable mode (MPM) group including three intra prediction modes determined using a left and an above intra prediction mode of the current block. The method can further include generating a prediction block based on the intra prediction mode of the current block specified by the mode group indicator and the prediction mode index, generating a residual block of the current block, generating a quantization block by transforming and quantizing the residual block. The method can include scanning the quantized block using a scan pattern determined based on the intra prediction mode and the size of a transform unit, and entropy-encoding the scanned information of the quantized block.

Abstract: An apparatus of decoding video data can include a prediction mode decoding module to derive a luma intra prediction mode and a chroma intra prediction mode; a prediction size determining module to determine a size of a luma transform unit and a size of a chroma transform unit using transform size information; a reference pixel generating module to generate referential pixels if at least one reference pixel is unavailable; and a reference pixel filtering module adaptively filter the reference pixels of a current luma block based on the luma intra prediction mode and the size of the luma transform unit. The apparatus can further include a prediction block generating module to generate prediction blocks of the current luma block and the current chroma block; and a residual bock generating module to generate residual blocks of the current luma block and the current chroma block.

Abstract: A method for processing image data can include determining a boundary strength per each 4-sample edge which is a boundary of a transform unit or a prediction unit and lies on an 8×8 sample grid, determining whether to apply a deblocking filtering on the 4-sample edge when the boundary strength of the 4-sample edge is not zero, selecting a deblocking filter to be applied on the 4-sample edge when it is determined to apply a deblocking filtering on the 4-sample edge, filtering the 4-sample edge by using the selected deblocking filter, and applying an edge offset when a sample adaptive offset (SAO) type indicates the edge offset.

Abstract: A method of decoding video data in merge mode can include constructing a merge candidate list using available spatial and temporal merge candidates, deriving motion information using a merge index and the merge candidate list, generating a prediction block using the motion information, generating a residual block by inverse-quantizing a quantized block using a quantization parameter and a quantization matrix and by inverse-transforming the inverse quantized block, and generating a reconstructed block using the residual block and the prediction block. The quantization parameter is generated per quantization unit and a minimum size of the quantization unit is adjusted per picture, and the quantization parameter is generated using a quantization parameter predictor and a differential quantization parameter.

Abstract: A method of processing a reconstructed picture can include generating a prediction block based on a prediction mode; generating a quantization block by inverse-scanning quantization coefficient information; generating a transform block by inverse-quantizing the quantization block using a quantization parameter; generating a residual block by inverse-transforming the transform block; generating a reconstructed picture by using the prediction block and the residual block; and applying a deblocking filter on the reconstructed picture.

Abstract: A method of decoding video data in merge mode can include constructing a merge candidate list using available spatial and temporal merge candidates; deriving motion information using a merge index and the merge candidate list; generating a prediction block using the motion information; generating a residual block by inverse-quantizing a quantized block using a quantization parameter and a quantization matrix and by inverse-transforming the inverse quantized block; and generating a reconstructed block using the residual block and the prediction block, wherein the quantization parameter is generated per quantization unit and a minimum size of the quantization unit is adjusted per picture, and the quantization parameter is generated using a quantization parameter predictor and a differential quantization parameter.

Abstract: A method of decoding an image can include constructing an amvp candidate list using available motion vector candidates of a left, an above and a temporal motion vector candidate, selecting a motion vector predictor among motion vector candidates of the amvp candidates list using the amvp index, and generating a motion vector using the motion vector predictor and a differential motion vector. The method further includes generating a prediction block using the motion vector and a reference picture index, inversely quantizing a quantized block using a quantization parameter to generate a transformed block and inversely transforming the transformed block to generate a residual block, and generating a reconstructed block. Also, the quantization parameter is generated per quantization unit, a minimum size of the quantization unit is adjusted per picture, and the quantization parameter is generated using a differential quantization parameter and a quantization parameter predictor.

Abstract: A method for encoding an image using intra prediction can include determining an intra prediction mode of a current block, generating a mode group indicator and a prediction mode index specifying the intra prediction mode of the current block, constructing a most probable mode (MPM) group including three intra prediction modes determined using a left and an above intra prediction mode of the current block. The method can further include generating a prediction block based on the intra prediction mode of the current block specified by the mode group indicator and the prediction mode index, generating a residual block of the current block, generating a quantization block by transforming and quantizing the residual block. The method can include scanning the quantized block using a scan pattern determined based on the intra prediction mode and the size of a transform unit, and entropy-encoding the scanned information of the quantized block.

Abstract: A method of decoding an image can includes constructing an advanced motion vector predication (AMVP) candidate 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 the AMVP candidates list using an AMVP index, and generating a motion vector using the motion vector predictor and a differential motion vector, generating a prediction block using the motion vector and a reference picture index; inversely quantizing a quantized block using a quantization parameter to generate a transformed block and inversely transforming the transformed block to generate a residual block; and generating a reconstructed block using the prediction block and the residual block, in which the quantization parameter is generated per quantization unit, and a minimum size of the quantization unit is adjusted per picture.

Abstract: A method for encoding an image using intra prediction can include determining an intra prediction mode of a current block; generating a mode group indicator and a prediction mode index; constructing a most probable mode (MPM) group including three intra prediction modes determined using a left and an above intra prediction mode of the current block; 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, wherein if the size of the current block is 4×4, the reference pixels are not filtered, and if the size of the current block is larger than 4×4, the number of intra prediction mode where the reference pixels are filtered increases as the current block becomes larger; generating the prediction block using the reference pixels.

Abstract: A method of processing a reconstructed picture can include generating a prediction block based on a prediction mode; generating a quantization block by inverse-scanning quantization coefficient information; generating a transform block by inverse-quantizing the quantization block using a quantization parameter; generating a residual block by inverse-transforming the transform block; generating a reconstructed picture by using the prediction block and the residual block; andapplying a deblocking filter on the reconstructed picture.

Abstract: An image encoding method can include determining an intra prediction mode of a current prediction unit; constructing a mode group including three intra prediction modes using valid intra prediction modes of left and top blocks of the current prediction unit; determining a mode group indicator and a prediction mode index of the current prediction unit; and encoding the mode group indicator and the prediction mode index, in which the mode group indicator indicates whether or not the intra prediction mode of the current prediction unit belongs to the mode group, when the mode group indicator indicates that the intra prediction mode of the current prediction unit belongs to the mode group, the prediction mode index specifies the intra prediction mode of the current prediction unit in the mode group, when the mode group indicator indicates that the intra prediction mode of the current prediction unit does not belong to the mode group, the prediction mode index specifies the intra prediction mode of the current pre

Abstract: An apparatus of decoding video data can include a prediction mode decoding module to derive a luma intra prediction mode and a chroma intra prediction mode; a prediction size determining module to determine a size of a luma transform unit and a size of a chroma transform unit using transform size information; a reference pixel generating module to generate referential pixels if at least one reference pixel is unavailable; and a reference pixel filtering module adaptively filter the reference pixels of a current luma block based on the luma intra prediction mode and the size of the luma transform unit. The apparatus can further include a prediction block generating module to generate prediction blocks of the current luma block and the current chroma block; and a residual bock generating module to generate residual blocks of the current luma block and the current chroma block.

Abstract: A method for decoding image data can include generating a prediction block based on a prediction mode; generating a quantization block by inversely scanning quantization coefficient information; generating a transform block by inversely quantizing the quantization block using a quantization parameter; generating a residual block by inversely transforming the transform block; generating a reconstructed picture by using the prediction block and the residual block; and applying a deblocking filter on the reconstructed picture, wherein it is determined whether the deblocking filtering is applied between two adjacent blocks P and Q containing samples p0 and q0 respectively by using a boundary quantization parameter when a boundary strength is not zero, the boundary quantization parameter is set to an average value of a quantization parameter of block P and a quantization parameter of block Q, and the quantization parameter is derived by adding a residual quantization parameter and a quantization parameter predicto

Abstract: A method can include decoding residual signals to generate quantized coefficient components; determining an inverse scan pattern and generating a quantized block using the inverse scan pattern; deriving a quantization parameter and inversely quantizing the quantized block using the quantization parameter to generate a transformed block; and inversely transforming the transformed block to generate a residual block, in which when the quantization parameter is a chroma quantization parameter, the chroma quantization parameter is generated using a luma quantization parameter and an offset parameter indicating a relationship between the luma quantization parameter and the chroma quantization parameter, the luma quantization parameter is derived using a differential quantization parameter and a quantization parameter predictor, and the differential quantization parameter is generated by entropy decoding, and parameters are set according to certain conditions.

Abstract: An apparatus can include a prediction mode decoding module configured to derive a luma intra prediction mode and a chroma intra prediction mode; a prediction size determining module configured to determine a size of a luma transform unit and a size of a chroma transform unit using transform size information; a reference pixel generating module configured to generate referential pixels if at least one reference pixel is unavailable; a reference pixel filtering module configured to adaptively filter the reference pixels of a current luma block based on the luma intra prediction mode and the size of the luma transform unit, and not to filter the reference pixels of a current chroma block; a prediction block generating module configured to generate prediction blocks of the current luma block and the current chroma block; a residual bock generating module configured to generate a luma residual block and a chroma residual block; and an adder.

Abstract: An image decoding apparatus can include a prediction mode decoding module for deriving luma intra prediction mode and chroma intra prediction mode; a prediction size determining module for determining a size of a luma transform unit and a size of a chroma transform unit; a reference pixel generating module for generating a reference pixel when at least one reference pixel is unavailable; a reference pixel filtering module for adaptively filtering a reference pixel of a current luma block based on the luma intra prediction mode and the size of the luma transform unit, wherein a reference pixel of a current chroma block is not filtered; a prediction block generating module for generating prediction blocks of the current luma block and the current chroma block; and a residual block generating module for generating a luma residual block and a chroma residual block.

Abstract: An image coding method can include generating a prediction block using an intra prediction mode; generating a prediction block using 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, in which the residual signals are transformed in transform unit, a transform type used for transforming the residual signals of luma component is determined by a prediction mode and a size of the transform unit, and a transform type used for transforming the residual signals of chroma components is a DCT-based integer transform, and the quantization parameter is a luma quantization parameter, and a differential quantization parameter is generated by sub

Abstract: A method for encoding an image using intra prediction can include determining an intra prediction mode of a current block; generating a mode group indicator and a prediction mode index; constructing a most probable mode (MPM) group including three intra prediction modes determined using a left and an above intra prediction mode of the current block; 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, wherein if the size of the current block is 4×4, the reference pixels are not filtered, and if the size of the current block is larger than 4×4, the number of intra prediction mode where the reference pixels are filtered increases as the current block becomes larger; generating the prediction block using the reference pixels.