WO2012046996A2 - 쿼드 트리를 이용한 블록 정보 부/복호화 방법 및 이러한 방법을 사용하는 장치 - Google Patents
쿼드 트리를 이용한 블록 정보 부/복호화 방법 및 이러한 방법을 사용하는 장치 Download PDFInfo
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
- H04N19/96—Tree coding, e.g. quad-tree coding
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/119—Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/18—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a set of transform coefficients
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- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
- H04N19/63—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using sub-band based transform, e.g. wavelets
- H04N19/64—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using sub-band based transform, e.g. wavelets characterised by ordering of coefficients or of bits for transmission
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Definitions
- the present invention relates to a block information encoding / decoding method using a quad tree, and more particularly, to an image encoding / decoding method.
- an inter prediction technique for predicting pixel values included in a current picture from a previous and / or subsequent picture in time, and predicting pixel values included in a current picture using pixel information in the current picture.
- An intra prediction technique an entropy encoding technique of allocating a short code to a symbol with a high frequency of appearance and a long code to a symbol with a low frequency of appearance may be used.
- Video compression technology is a technology that provides a constant network bandwidth under a limited operating environment of hardware without considering a fluid network environment.
- a new compression technique is required to compress image data applied to a network environment in which bandwidth changes frequently, and a scalable video encoding / decoding method may be used for this purpose.
- a first object of the present invention is to provide a method of decoding transform unit information using a quad tree to improve image encoding efficiency.
- a third object of the present invention is to provide an apparatus for decoding transform unit information using a quad tree in order to increase image encoding efficiency.
- a fourth object of the present invention is to provide an apparatus for decoding transform unit information by using a quad tree and a joint encoding method in order to increase image encoding efficiency.
- a transform unit information decoding method using a quad tree structure including: decoding integrated code block flag information in a transform unit, and size information of the transform unit; And decoding the fragment information flag based on the integrated code block flag information. Decoding the split information flag based on the size information of the transform unit and the integrated code block flag information, when the transform coefficient does not exist in the transform unit, without decoding the split information flag information of the transform unit Decoding the code block flag information and decoding the code block flag information of the transform unit when the transform unit is not further divided based on the partition information flag.
- the transform unit flag and the split information flag are not decoded.
- the method may further include decoding the code block flag information.
- the integrated code block flag the integrated code block flag is applied only at a transform depth fixed by fixing a single transform depth to which the integrated code block flag is applied, or the transform depth is defined as a predetermined parameter at a plurality of transform unit depths. Can be adapted.
- a transform unit information combined flag encoded by combining an integrated code block flag and a transform information flag Decoding the pattern information of the transformation unit based on the decoding, and decoding the code block flag information and the partition information flag information of the transformation unit corresponding to the pattern information based on the pattern information.
- the pattern information may be a variable generated based on the number of cases in which a code block flag exists in a predetermined transformation unit and the number of cases in which a segmentation information flag exists.
- the pattern information may be binary coded based on a table using variable length coding.
- the pattern information may include 4-bit information representing a luminance code block flag value of MSB (Most Significant Bit), a cb code block flag of MSB-1, a cr code block flag of MSB-2, and split_flag of a LSB (Least Significant Bit). Based on the pattern information may be encoded.
- the image decoding apparatus decodes the integrated code block flag information and the size information of the transform unit, and the integrated code block flag information and the transform
- An entropy decoding unit may decode the partition information flag based on the size information of the unit, and may decode the transform coefficient information of the transform unit provided from the entropy decoder. If there is no transform coefficient in the transform unit, the entropy decoder decodes code block flag information of the transform unit without decoding the partition information flag information, and further divides the transform unit based on the partition information flag. If not, the code block flag information of the transformation unit may be decoded.
- the entropy decoding unit may decode code block flag information of the transform unit without decoding the integrated code flag and the partition information flag when the size of the transform unit is the same as a minimum transform unit that is not divided into additional transform units. Can be.
- the video decoding apparatus for achieving the fourth object of the present invention described above is based on the transform unit information combined flag encoded by combining the integrated code block flag and the transform information flag of the transform unit;
- An entropy decoding unit for decoding pattern information and decoding code block flag information and split information flag information of a transformation unit corresponding to the pattern information based on the pattern information, and transform coefficient information of a transformation unit provided from the entropy decoding unit. It may include an inverse transform unit for inverse transformation.
- the pattern information may be generated based on the number of cases in which a code block flag exists in a predetermined conversion unit and the number of cases in which a segmentation information flag exists.
- the pattern information may be binary coded based on a table using variable length coding.
- the pattern information may include 4-bit information representing a luminance code block flag value of MSB (Most Significant Bit), a cb code block flag of MSB-1, a cr code block flag of MSB-2, and split_flag of a LSB (Least Significant Bit). Based on the pattern information may be encoded.
- transform coefficient information and The partition information can be expressed. Therefore, it is possible to encode / decode transform coefficient information and partitioning information of a transform unit with a small number of bits, thereby increasing the encoding / decoding efficiency.
- FIG. 1 is a block diagram illustrating an image encoding apparatus according to an embodiment of the present invention.
- FIG. 2 is a block diagram illustrating an image decoder according to another embodiment of the present invention.
- FIG. 3 is a flowchart illustrating a method of transmitting transform unit information using a quad tree structure according to another embodiment of the present invention.
- FIG. 4 is a conceptual diagram illustrating a method of applying an integrated code block flag and a partition information flag according to another embodiment of the present invention.
- FIG. 5 is a conceptual diagram illustrating a method of applying an integrated code block flag and a partition information flag according to another embodiment of the present invention.
- FIG. 6 is a conceptual diagram illustrating a method of applying an integrated code block flag and a partition information flag according to another embodiment of the present invention.
- FIG. 7 is a conceptual diagram illustrating a different application of an integrated code block flag and a split information flag according to depth information of a transform unit according to another embodiment of the present invention.
- FIG. 8 is a conceptual diagram illustrating a decoding process of transform unit information in a quad tree structure according to another embodiment of the present invention.
- FIG. 9 is a flowchart illustrating a method of encoding transform coefficient information and split information of a transform unit when a transform unit information combining flag is used.
- FIG. 10 is a conceptual diagram illustrating a method of combining and encoding an integrated code flag and a partition information flag according to another embodiment of the present invention, and integrating transform unit information of transform units existing at the same depth.
- first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
- the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
- FIG. 1 is a block diagram illustrating an image encoding apparatus according to an embodiment of the present invention.
- the image encoding apparatus 100 may include a picture splitter 105, a predictor 110, a transformer 115, a quantizer 120, a realigner 125, and an entropy encoder 130. , An inverse quantization unit 135, an inverse transform unit 140, a filter unit 145, and a memory 150.
- each of the components shown in FIG. 1 is independently shown to represent different characteristic functions in the image encoding apparatus, and does not mean that each of the components is made of separate hardware or one software component unit.
- each component is included in each component for convenience of description, and at least two of the components may be combined into one component, or one component may be divided into a plurality of components to perform a function.
- the integrated and separated embodiments of the components are also included in the scope of the present invention, without departing from the spirit of the invention.
- the components may not be essential components for performing essential functions in the present invention, but may be optional components for improving performance.
- the present invention can be implemented including only the components essential for implementing the essentials of the present invention except for the components used for improving performance, and the structure including only the essential components except for the optional components used for improving performance. Also included in the scope of the present invention.
- the picture dividing unit 105 may divide the input picture into at least one processing unit.
- the processing unit may be a prediction unit (PU), a transform unit (TU), or a coding unit (CU).
- the picture division unit 105 divides one picture into a combination of a plurality of coding units, prediction units, and transformation units, and combines one coding unit, prediction unit, and transformation unit on a predetermined basis (for example, a cost function). You can select to encode the picture.
- one picture may be divided into a plurality of coding units.
- a recursive tree structure such as a quad tree structure may be used.
- a coding unit that is split into another coding unit based on one image or a maximum size coding unit as a root may be divided. It can be split with as many child nodes as there are units. Coding units that are no longer split according to certain restrictions become leaf nodes. That is, when it is assumed that only square division is possible for one coding unit, one coding unit may be split into at most four other coding units.
- a coding unit may be used not only as a coding unit but also as a decoding unit.
- the prediction unit is divided in the form of at least one square or rectangle of the same size in one coding unit, or the shape of one prediction unit among the prediction units split in one coding unit is different from that of another prediction unit. It can be divided into forms.
- the intra prediction may be performed without splitting the prediction unit into NxN.
- the prediction unit 110 may include an inter prediction unit for performing inter prediction and an intra prediction unit for performing intra prediction. Whether to use inter prediction or intra prediction may be determined for the prediction unit, and specific information (eg, intra prediction mode, motion vector, reference picture, etc.) according to each prediction method may be determined. In this case, the processing unit in which the prediction is performed may differ from the processing unit in which the prediction method and the details are determined. For example, the method of prediction and the prediction mode may be determined in the prediction unit, and the prediction may be performed in the transform unit. The residual value (residual block) between the generated prediction block and the original block may be input to the transformer 115.
- specific information eg, intra prediction mode, motion vector, reference picture, etc.
- prediction mode information and motion vector information used for prediction may be encoded by the entropy encoder 130 along with the residual value and transmitted to the decoder.
- the original block may be encoded as it is and transmitted to the decoder without generating the prediction block through the prediction unit 110.
- the inter prediction unit may predict the prediction unit based on the information of at least one of the previous picture or the subsequent picture of the current picture.
- the inter prediction unit may include a reference picture interpolator, a motion predictor, and a motion compensator.
- the reference picture interpolator may receive reference picture information from the memory 155 and generate pixel information of an integer pixel or less in the reference picture.
- a DCT based 8-tap interpolation filter having different filter coefficients may be used to generate pixel information of integer pixels or less in units of 1/4 pixels.
- a DCT-based interpolation filter having different filter coefficients may be used to generate pixel information of an integer pixel or less in units of 1/8 pixels.
- the motion predictor may perform motion prediction based on the reference picture interpolated by the reference picture interpolator.
- various methods such as a full search-based block matching algorithm (FBMA), a three step search (TSS), and a new three-step search algorithm (NTS) may be used.
- the motion vector may have a motion vector value in units of 1/2 or 1/4 pixels based on the interpolated pixels.
- the motion prediction unit may predict the current prediction unit by using a different motion prediction method.
- various methods such as a skip method, a merge method, and an advanced motion vector prediction (AMVP) method, may be used.
- AMVP advanced motion vector prediction
- the intra prediction unit may generate a prediction unit based on reference pixel information around a current block that is pixel information in a current picture. If the neighboring block of the current prediction unit is a block for which inter prediction is performed, and the reference pixel is a pixel for which inter prediction is performed, the intra-prediction of a reference pixel included in the block for performing inter prediction is performed. It can be used in place of the reference pixel information of the block. That is, when the reference pixel is not available, the unavailable reference pixel information may be replaced with at least one reference pixel among the available reference pixels.
- a prediction mode may have a directional prediction mode using reference pixel information according to a prediction direction, and a non-directional mode using no directional information when performing prediction.
- the mode for predicting the luminance information and the mode for predicting the color difference information may be different, and the intra prediction mode information or the predicted luminance signal information predicting the luminance information may be used to predict the color difference information.
- the intra prediction screen is based on the pixels on the left side of the prediction unit, the pixels on the upper left side, and the pixels on the top side.
- the intra prediction may be performed using a reference pixel based on the transform unit.
- intra prediction using NxN division may be used only for a minimum coding unit.
- the intra prediction method may generate a prediction block after applying an adaptive intra smoothing (AIS) filter to a reference pixel according to a prediction mode.
- AIS adaptive intra smoothing
- the intra prediction mode of the current prediction unit may be predicted from the intra prediction mode of the prediction unit existing around the current prediction unit.
- the prediction mode of the current prediction unit is predicted by using the mode information predicted from the neighboring prediction unit
- the prediction mode of the screen of the current prediction unit and the neighboring prediction unit is the same
- the current prediction unit is determined by using predetermined flag information.
- Information that the prediction modes of the neighboring prediction units are the same may be transmitted. If the prediction modes of the current prediction unit and the neighboring prediction unit are different, entropy encoding may be performed to encode the prediction mode information of the current block.
- a residual block may include a prediction unit that performs prediction based on the prediction unit generated by the prediction unit 110, and a residual block that includes residual information that is a difference from an original block of the prediction unit.
- the generated residual block may be input to the converter 115.
- the transform unit 115 converts the residual block including residual information of the original block and the prediction unit generated by the prediction unit 110 such as a discrete cosine transform (DCT) or a discrete sine transform (DST). Can be converted using Whether to apply DCT or DST to transform the residual block may be determined based on intra prediction mode information of the prediction unit used to generate the residual block.
- DCT discrete cosine transform
- DST discrete sine transform
- the quantization unit 120 may quantize the values converted by the transformer 115 into the frequency domain.
- the quantization coefficient may change depending on the block or the importance of the image.
- the value calculated by the quantization unit 120 may be provided to the inverse quantization unit 135 and the reordering unit 125.
- the reordering unit 125 may reorder coefficient values with respect to the quantized residual value.
- the reordering unit 125 may change the two-dimensional block shape coefficients into a one-dimensional vector form through a coefficient scanning method. For example, the reordering unit 125 may scan from a DC coefficient to a coefficient of a high frequency region by using a Zig-Zag Scan method and change it into a one-dimensional vector form.
- a vertical scan method for scanning two-dimensional block shape coefficients in a column direction, not a zig zag scan method, and a horizontal scan method for scanning two-dimensional block shape coefficients in a row direction will be used. Can be. That is, according to the size of the transform unit and the intra prediction mode, it is possible to determine which scan method among zigzag scan, vertical scan and horizontal scan is used.
- the entropy encoder 130 may perform entropy encoding based on the values calculated by the reordering unit 125.
- Entropy coding may use various coding methods such as, for example, Exponential Golomb, Context-Adaptive Variable Length Coding (CAVLC), and Context-Adaptive Binary Arithmetic Coding (CABAC).
- Exponential Golomb Context-Adaptive Variable Length Coding
- CABAC Context-Adaptive Binary Arithmetic Coding
- the entropy encoder 130 receives residual coefficient coefficient information, block type information, prediction mode information, partition unit information, prediction unit information, transmission unit information, and motion vector information of the coding unit from the reordering unit 125 and the prediction unit 110.
- Various information such as reference frame information, interpolation information of a block, and filtering information may be encoded.
- the entropy encoder 130 may entropy encode a coefficient value of a coding unit input from the reordering unit 125.
- the entropy encoder 130 may store a table for performing entropy coding, such as a variable length coding table, and perform entropy coding using the stored variable length coding table.
- some codewords included in a table can be changed by using a counter or a direct swapping method to change the codeword allocation for the code number of the corresponding information. have. For example, for the top few code numbers assigned a small number of code words in a table that maps code numbers to code words, use a counter to add the shortest length to the code number with the highest number of occurrences. You can adaptively change the mapping order of the tables that map code words to code numbers so that you can assign code words. When the number of counts counted in the counter reaches a predetermined threshold, counting may be performed again by dividing the count count recorded in the counter in half.
- the code number in the table that does not perform counting is the bit assigned to the code number by converting the code number and digit immediately above when the information corresponding to the code number is generated by using the direct swapping method. Entropy coding can be performed with a small number.
- the entropy encoder 130 may encode the integrated code block flag at the current transform depth and encode the split information flag based on the integrated code block flag information. In addition, the entropy encoder 130 may combine and encode the fragment information flag based on the integrated code block flag information.
- additional encoding methods will be described in the following embodiments of the present invention.
- the inverse quantizer 135 and the inverse transformer 140 inverse quantize the quantized values in the quantizer 120 and inversely transform the transformed values in the transformer 115.
- the residual value generated by the inverse quantizer 135 and the inverse transformer 140 is combined with the prediction unit predicted by the motion estimator, the motion compensator, and the intra predictor included in the predictor 110 to restore the block. Create a Reconstructed Block).
- the filter unit 145 may include at least one of a deblocking filter, an offset correction unit, and an adaptive loop filter (ALF).
- ALF adaptive loop filter
- the deblocking filter 145 may remove block distortion caused by boundaries between blocks in the reconstructed picture. In order to determine whether to perform deblocking, it may be determined whether to apply a deblocking filter to the current block based on the pixels included in several columns or rows included in the block. When the deblocking filter is applied to the block, a strong filter or a weak filter may be applied according to the required deblocking filtering strength. In addition, in applying the deblocking filter, horizontal filtering and vertical filtering may be performed in parallel when vertical filtering and horizontal filtering are performed.
- the offset correction unit may correct the offset with respect to the original image on a pixel-by-pixel basis for the deblocking image.
- the pixels included in the image are divided into a predetermined number of areas, and then, an area to be offset is determined, an offset is applied to the corresponding area, or offset considering the edge information of each pixel. You can use this method.
- the adaptive loop filter may perform filtering based on a value obtained by comparing the filtered reconstructed image with the original image. After dividing the pixels included in the image into a predetermined group, one filter to be applied to the group may be determined and filtering may be performed for each group. For information on whether to apply the ALF, the luminance signal may be transmitted for each coding unit (CU), and the size and coefficient of the ALF to be applied may vary according to each block.
- the ALF may have various forms, and the number of coefficients included in the filter may also vary.
- Such filtering related information filter coefficient information, ALF On / Off information, filter type information
- Such filtering related information filter coefficient information, ALF On / Off information, filter type information
- Such filtering related information filter coefficient information, ALF On / Off information, filter type information
- the memory 150 may store the reconstructed block or picture calculated by the filter unit 145, and the stored reconstructed block or picture may be provided to the predictor 110 when performing inter prediction.
- FIG. 2 is a block diagram illustrating an image decoder according to another embodiment of the present invention.
- the image decoder 200 includes an entropy decoder 2110, a reordering unit 215, an inverse quantization unit 220, an inverse transform unit 225, a prediction unit 230, and a filter unit 235.
- the memory 240 may be included.
- the input bitstream may be decoded by a procedure opposite to that of the image encoder.
- the entropy decoder 210 may perform entropy decoding in a procedure opposite to that of the entropy encoding performed by the entropy encoder of the image encoder.
- the VLC table used to perform entropy encoding in the image encoder may be implemented in the same variable length encoding table in the entropy decoder to perform entropy decoding.
- Information for generating the prediction block among the information decoded by the entropy decoder 210 may be provided to the predictor 230, and a residual value obtained by entropy decoding by the entropy decoder may be input to the reordering unit 215.
- the entropy decoder 210 may change a code word assignment table using a counter or direct swapping method, and may perform entropy decoding based on the changed code word assignment table. have.
- Information related to intra prediction and inter prediction may be decoded.
- entropy decoding is performed based on the constraint to provide information related to the intra prediction and the inter prediction for the current block. I can receive it.
- the entropy decoding unit may perform the decoding operation described with reference to FIGS. 3 to 8 of the embodiment of the present invention.
- the entropy decoding unit 210 may decode the integrated code block flag information in the transform unit and decode the partition information flag based on the size information of the transform unit and the integrated code block flag information. Further, the integrated code block flag and the transform information flag are combined to decode the pattern information of the transform unit based on the transform unit information combined flag encoded, and the code block flag information and the split of the transform unit corresponding to the pattern information based on the pattern information. Information flag information can be decoded. A detailed entropy decoding process will be described in the following embodiment of the present invention.
- the reordering unit 215 may reorder the entropy decoded bitstream by the entropy decoding unit 210 based on a method of rearranging the bitstream. Coefficients expressed in the form of a one-dimensional vector may be reconstructed by reconstructing the coefficients in a two-dimensional block form.
- the reordering unit may be realigned by receiving information related to coefficient scanning performed by the encoder and performing reverse scanning based on the scanning order performed by the encoder.
- the inverse quantization unit 220 may perform inverse quantization based on the quantization parameter provided by the encoder and the coefficient values of the rearranged block.
- the inverse transformer 225 may perform inverse DCT and inverse DST on the DCT and the DST performed by the transformer with respect to the quantization result performed by the image encoder. Inverse transformation may be performed based on a transmission unit determined by the image encoder.
- the DCT and the DST may be selectively performed by the transform unit of the image encoder according to a plurality of pieces of information, such as a prediction method, a size and a prediction direction of the current block, and the inverse transform unit 225 of the image decoder may be performed by the transform unit of the image encoder.
- the inverse transformation may be performed based on the converted transformation information.
- the transformation may be performed based on the coding unit rather than the transformation unit.
- the prediction unit 230 may generate the prediction block based on the prediction block generation related information provided by the entropy decoder 210 and previously decoded block or picture information provided by the memory 240.
- the prediction unit 230 may include a prediction unit determiner, an inter prediction unit, and an intra prediction unit.
- the prediction unit determination unit receives various information such as prediction unit information input from the entropy decoder, prediction mode information of the intra prediction method, and motion prediction related information of the inter prediction method, and distinguishes the prediction unit from the current coding unit. It is possible to determine whether to perform inter prediction or intra prediction.
- the inter prediction unit uses information required for inter prediction of the current prediction unit provided by the image encoder to determine the current prediction unit based on information included in at least one of a previous picture or a subsequent picture of the current picture including the current prediction unit. Inter prediction can be performed.
- Whether the motion prediction method of the prediction unit included in the coding unit based on the coding unit to perform inter prediction is skip mode, merge mode, or AMVP mode. Can be determined.
- the intra prediction unit may generate a prediction block based on pixel information in the current picture.
- the intra prediction may be performed based on the intra prediction mode information of the prediction unit provided by the image encoder.
- the intra prediction unit may include an AIS filter, a reference pixel interpolator, and a DC filter.
- the AIS filter is a part of filtering the reference pixel of the current block and determines whether to apply the filter according to the prediction mode of the current prediction unit.
- AIS filtering may be performed on the reference pixel of the current block by using the prediction mode and the AIS filter information of the prediction unit provided by the image encoder. If the prediction mode of the current block is a mode that does not perform AIS filtering, the AIS filter may not be applied.
- the reference pixel interpolator may generate a reference pixel having an integer value or less by interpolating the reference pixel. If the prediction mode of the current prediction unit is a prediction mode for generating a prediction block without interpolating the reference pixel, the reference pixel may not be interpolated.
- the DC filter may generate the prediction block through filtering when the prediction mode of the current block is the DC mode.
- the reconstructed block or picture may be provided to the filter unit 235.
- the filter unit 235 may include a deblocking filter, an offset correction unit, and an ALF.
- Information about whether a deblocking filter is applied to a corresponding block or picture, and when the deblocking filter is applied to the corresponding block or picture, may be provided with information about whether a strong filter or a weak filter is applied.
- the deblocking filter related information provided by the image encoder may be provided and the deblocking filtering of the corresponding block may be performed in the image decoder.
- vertical deblocking filtering and horizontal deblocking filtering may be performed, but at least one of vertical deblocking and horizontal deblocking may be performed in an overlapping portion.
- Vertical deblocking filtering or horizontal deblocking filtering which has not been previously performed, may be performed at a portion where vertical deblocking filtering and horizontal deblocking filtering overlap. Through this deblocking filtering process, parallel processing of deblocking filtering is possible.
- the offset correction unit may perform offset correction on the reconstructed image based on the type of offset correction and offset value information applied to the image during encoding.
- the ALF may perform filtering based on a value obtained by comparing the restored image with the original image after performing the filtering.
- the ALF may be applied to the coding unit based on the ALF application information, the ALF coefficient information, etc. provided from the encoder. Such ALF information may be provided included in a specific parameter set.
- the memory 240 may store the reconstructed picture or block to use as a reference picture or reference block, and may provide the reconstructed picture to the output unit.
- a coding unit is used as a coding unit for convenience of description, but may also be a unit for performing decoding as well as encoding.
- an encoding / decoding method of an intra prediction mode using two candidate intra prediction modes described with reference to FIGS. 3 to 12 according to an embodiment of the present invention is implemented according to the functions of the respective modules described above with reference to FIGS. 1 and 2.
- Binary codes indicating predetermined flag information used in the following embodiments of the present invention are exemplary and can represent the same information through different binary codes, and such embodiments are also included in the scope of the present invention.
- FIG. 3 is a flowchart illustrating a method of transmitting transform unit information using a quad tree structure according to another embodiment of the present invention.
- step S300 it is determined whether the size of the current transformation unit is larger than the minimum transformation unit.
- the size of the current transform unit may be calculated based on a transform depth information (trafoDepth), a coefficient indicating the maximum transform unit size information, or may be calculated through a coefficient indicating the block size information directly.
- a transform depth information (trafoDepth)
- a coefficient indicating the maximum transform unit size information or may be calculated through a coefficient indicating the block size information directly.
- the respective code block flags (cbf_y, cbf_u, and cbf_v) are respectively transmitted in the current conversion unit without transmitting the integrated code block flag information. It can be encoded (step S340).
- the code block flag cbf_luma or cbf_y indicates whether there is at least one transform coefficient other than zero among the transform coefficient values obtained by converting the luminance signal in the current conversion unit, and cbf_cb indicates that zero of the transform coefficient values obtained by converting the chrominance signal cb in the current transform unit.
- Cbf_cr may indicate whether one or more transform coefficients other than zero among the transform coefficient values obtained by converting the chrominance signal cr in the current transform unit are present.
- the integrated code block flag is encoded at the current transform depth (step S310).
- the integrated code block flag is a flag indicating whether transform quantization coefficients of the luminance signal and the chrominance signal exist. If the value is a non-zero value, the integrated code block flag indicates that one or more transform coefficients other than zero exist in the corresponding transform unit.
- the unified code flag may be used as a flag representatively representing the Y / Cb / Cr code block flag.
- the integration code flag can be represented as a non-zero value if any of the cbf of Y / Cb / Cr is not 0. If the cbf of Y / Cb / Cr is all 0, the integration code flag is 0. It can be expressed as.
- Whether the integrated code block flag is applied to various units such as a sequence, a picture, a slice, or the like can be fixed by using a predetermined predetermined conversion depth that uses the integrated code block flag or by adaptively changing the conversion depth where the integrated code block flag can be applied. You can do it differently.
- Information for adaptively changing the conversion depth may be included in a sequence parameter set (SPS), a picture parameter set (PPS), and a slice header.
- split information flag may be used as the same meaning as split_transform_flag.
- the partition information flag when the current conversion unit is divided, the partition information flag may be set to a value other than 0, and when the current conversion unit is not split, the partition information flag may be set to 0 and used.
- Binary codes for indicating syntax elements and syntax element information used in the embodiments of the present invention are exemplary and may use binary symbols of other syntax elements and other syntax elements as long as they do not depart from the essence of the present invention.
- the partition information may be transmitted differently according to the integrated code flag.
- unnecessary partitioning information may not be transmitted by additionally transmitting partitioning information about the current transformation unit.
- the integrated code block flag and the partition information flag may be combined and joint coded. When the integrated code block flag and the fragment information flag are jointly encoded, the procedure of steps S300 to S320 may be different.
- the encoding method determines what information is to be encoded among cbf_y, cbf_u, cbf_v, and split_flag in the current transformation unit, and then expresses necessary syntax element information as predetermined pattern information and based on the pattern information.
- Each code block flag (cbf_y, cbf_u, cbf_v) and split information flag (split_transform_flag) may be expressed in the current transform unit.
- the encoding method using the integrated code flag will be described in detail below.
- step S300 the process returns to step S300 to determine whether the size of the divided transform unit is a transform unit of the smallest size, and if the split transformation unit is a transform unit of the smallest size, return to step S340.
- the procedure of encoding transform unit information may be ended.
- transform coefficient information and split information of the transform unit included in the coding unit may be transmitted for each coding unit.
- FIG. 4 is a conceptual diagram illustrating a method of applying an integrated code block flag and a partition information flag according to another embodiment of the present invention.
- FIG. 4 when the upper part of FIG. 4 and the lower part of FIG. 4 do not have a transform coefficient included in a current transform unit (All Zero Coefficient Block, AZCB) and apply an integrated code block flag only to a highest transform block, It is a conceptual diagram illustrating a method of transmitting the integrated code block flag and the split information flag.
- AZCB All Zero Coefficient Block
- an all zero coefficient block (AZCB) in which a transform coefficient does not exist in a current transform unit may be expressed by a term called a zero transform coefficient transform unit.
- FIG. 4 illustrates a case where the size of the coding unit and the size of the highest transform unit are the same and there are no transform coefficients included in the transform unit.
- the size of the coding unit is the same as the size of the most significant transformation unit and no transformation coefficients are included in the transformation unit, it is not split further. Therefore, set the unified code block flag to 0 in the most significant transformation unit. Even if the size information and transform coefficient information of the current transform unit can be transmitted.
- the partition information flag is not necessary. Not sent.
- the lower part of FIG. 4 illustrates a case where the size of the coding unit and the size of the highest transform unit are different, and indicate that there are no transform coefficients included in the transform unit.
- the integrated code block flag is set to 0, and the size of the current transform unit is not transmitted without the fragmentation information flag transmitted.
- Information and transform coefficient information can be transmitted.
- FIG. 5 is a conceptual diagram illustrating a method of applying an integrated code block flag and a partition information flag according to another embodiment of the present invention.
- FIG. 5 the upper and lower parts of FIG. 5 illustrate a method for transmitting an integrated code flag and a split information flag when there are transform coefficients included in a current transform unit and the integrated code block flag is applied only to the highest transform block. It is a conceptual diagram for illustration.
- FIG. 5 illustrates a case where the size of the coding unit and the size of the most significant transform unit are the same and the transform coefficients exist but the most significant transform unit is not divided into additional transform units.
- the integrated code block flag may be set to a non-zero value, and the split information flag may be transmitted as 0 to transmit split information and transform coefficient information of the current transform unit.
- the lower part of FIG. 5 shows a case where the size of the coding unit is the same as the size of the highest transform unit and the highest transform unit is split into additional transform units while the transform coefficients are present.
- the unified code flag is set to a nonzero value in the highest transform unit.
- the flag may be transmitted as a non-zero value to express whether the transform coefficient exists in the transform unit included in the current coding unit and the partition state.
- FIG. 6 is a conceptual diagram illustrating a method of applying an integrated code block flag and a partition information flag according to another embodiment of the present invention.
- the size of the highest transform unit is smaller than the coding unit and a transform coefficient exists.
- the integrated code block flag is transmitted as a non-zero value, and the current coding is performed without transmitting the partition information flag because it is divided into transform units having a smaller size than the current coding unit. It may indicate split information of the conversion unit included in the unit.
- FIG. 7 is a conceptual diagram illustrating a different application of an integrated code block flag and a split information flag according to depth information of a transform unit according to another embodiment of the present invention.
- an integrated code block flag and a partition information flag may be transmitted based on a conversion unit.
- the integrated code block flag is based on whether or not there are transform coefficients in the higher transform unit based on the highest transform unit. May be transmitted and a split information flag may be transmitted regarding whether the most significant transform unit is additionally split.
- the integrated code block flag when the depth of the transform unit is 0, since there is a transform coefficient, the integrated code block flag is set to a non-zero value and the partition information flag may be set to 1 since the split code unit is divided into additional lower transform units.
- the integration code flag and the partition information flag may be applied to each transform unit again.
- the first transform unit 700, the second transform unit 710, the third transform unit 720, and the fourth transform unit 730 are based on the z scan direction
- the first transform unit ( 700 to the third transform unit 720 may transmit the integrated code block flag as 0 because there are no transform coefficients, and may not transmit the partition information flag because the transform coefficients are all 0 and thus are not divided into additional transform units.
- Table 1 below shows the syntax for transmitting the integration code flag and the partition information flag.
- an integrated code block flag and a partition information flag may be expressed according to transform unit depth information in a transform tree syntax.
- FIG. 8 is a conceptual diagram illustrating a decoding process of transform unit information in a quad tree structure according to another embodiment of the present invention.
- the conversion unit disclosed on the left side of FIG. 8 represents a case where the size of the maximum conversion unit is 32x32 and the size of the minimum conversion unit is 4x4.
- FIG. 8 The left side of FIG. 8 is a block showing a state of division of a current transformation unit and the presence of transform coefficients, and the right side of FIG. 8 is a tree illustrating a method of expressing an integrated code block flag and a split information flag at each depth of a transformation unit. Structure.
- cbf_yuv_flag is a non-zero value, indicating that a transform coefficient exists at transform unit depth 0, and split_transform_flag is 1, which means that splitting occurs in a lower transform unit.
- the transform depth is 1 (810, 820, 830, and 840)
- information on whether a transform coefficient exists in the transform unit divided by the transform unit depth 1 and whether the transform unit of the transform unit depth 1 is further divided Indicates. That is, since the transform coefficient does not exist, the first transform block 850 transmits 0 as a value of the integrated code block flag and does not further transmit the partition information flag.
- the fourth transform block 860 is also the same as the first transform block, and since the transform coefficients exist in the second transform block 870 and the third transform block 880, the unified code block flag is transmitted as a non-zero value. In this case, the partition information flag may be transmitted as 1 since the partition is divided into additional conversion units.
- the transform unit further divided based on the second transform block, if the current transform unit is not split further (880), if the cbf_y, cbf_u, cbf_v of the current transform unit can be transmitted and split further ( In operation 890, the integrated code block flag information and the partition information flag in the current transformation unit may be transmitted.
- the divided transformation unit is the minimum transformation unit (895)
- the cbf_y, cbf_u, cbf_v information of the minimum transformation unit can be transmitted, respectively.
- the block information transmission method using the quad tree and the apparatus using the method according to another embodiment of the present invention may combine and encode the integrated code block flag and the partition information flag.
- each element of the integrated code block flag, cbf_y, cbf_u, cbf_v and split_transform_flag information indicating split information may be combined and encoded.
- the combined cbf_y, cbf_u, cbf_v and split_transform_flag information each of which can yield the integrated code block flag, can be represented by a single syntax element called cbf_yuv_split_flag, respectively. Used.
- Table 2 below is a table for performing joint encoding for combining and transmitting the integrated code flag and the fragment information flag.
- the transformation unit information combining flag may encode a case in which each element cbf_y, cbf_u, cbf_v and split_transform_flag indicating split information may appear based on the pattern information.
- cbf_u and cbf_v have already been encoded in a higher level transform unit
- cbf_u and cbf_v information need not be encoded in a lower transform unit
- only information of cbf_y needs to be coded if the current transform unit is a minimum coding unit.
- only information on whether the luminance signal exists in the current transformation unit may be encoded through the pattern 1. That is, the pattern of the current transformation unit is 1 and may further transmit information on whether a luminance signal exists in the current transformation unit.
- information on whether a luminance signal exists in the current transformation unit based on pattern 2 may be encoded.
- the pattern of the current transform unit is 2, and information about whether there is a luminance signal of the current transform unit and whether the current transform unit is split may be transmitted.
- the pattern information can be preferentially expressed as 4-bit information with cbf_y as MSB, cbf_u as MSB-1, cbf_v as MSB-2, and split_flag as LSB.
- the flag pattern can be encoded in binary using VLC code for later encoding. It is also possible.
- Table 3 below is a syntax structure of the transform unit information combined flag encoded by combining the integrated code flag and the split information flag.
- a new syntax element cbf_yuv_split_trans may be added to the transform_tree syntax to express luminance signal information, color difference signal information, and segmentation information in the current coding unit.
- transform unit information combining flags of transform units of the same size existing at the same depth may be jointly encoded.
- FIG. 9 is a flowchart illustrating a method of encoding transform coefficient information and split information of a transform unit when a transform unit information combining flag is used.
- a pattern of a code block flag and a partition information flag to be encoded in a transform unit is encoded (step S900).
- the pattern information of the code block flag and the partition information flag may be encoded based on Table 2.
- the code block flag and the split information flag are encoded based on the encoded pattern information (step S910).
- values of a code block flag and a partition information flag corresponding to the pattern information are encoded.
- the pattern information is 2
- information about whether a luminance signal exists in the current transformation unit may be encoded.
- FIG. 10 is a conceptual diagram illustrating a method of combining and encoding an integrated code flag and a partition information flag according to another embodiment of the present invention, and integrating transform unit information of transform units existing at the same depth.
- each block represents a transformation unit, and the number written in each transformation unit represents pattern information of combined flag information.
- 0 means pattern 1 and 1 means pattern 2 and 3 means pattern 4.
- the transformation unit is composed of four transformation units of pattern information 1.
- the transformation unit is of four transformation units of pattern information of 2, 4, 2, and 1. consist of.
- one higher transform unit pattern information may be generated by combining the pattern information of the lower transform unit again.
- Table 4 below shows upper transform unit pattern information.
- the first transform unit is 0, the second transform unit is 0, the third transform unit is 0, and the fourth transform unit is 0 It has a pattern value of cbf_yuv_split_trans and may have new pattern information 1.
- the transform unit 1 in the z scan direction has a pattern value of cbf_yuv_split_trans of 1, 2, 3, 3, and 0 of the transform unit. It may have pattern information 5.
- Such upper transform block pattern information may also be defined and used as a new syntax element in the transform_tree syntax.
- FIG. 11 is a flowchart for decoding block information of a quad tree structure according to another embodiment of the present invention.
- the integrated code block flag information in the current transform unit is decoded (step S1100).
- the split information flag is decoded based on the size information of the current transform unit and the integrated code flag information (step S1110).
- the processes of steps S1100 and S1110 may be different.
- the decoding unit information combining flag information of the current transformation unit is decoded, and information on whether a luminance signal, a chrominance signal exists or is divided in the current transformation unit based on the decoded pattern information is additionally added. Can be decrypted
- FIG. 12 is a flowchart illustrating a method of decoding transform unit information combined flag information according to another embodiment of the present invention.
- pattern information is decoded based on transformation unit information combining flag information (step S1200).
- Code block flag or partition information flag information corresponding to the pattern is decoded based on the decoded pattern information (step S1210).
- the pattern information is provided based on Table 2 described above, and code block flag information and split information flag information corresponding to the pattern information can be decoded.
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Abstract
Description
Claims (15)
- 변환 단위에서 통합 코드 블록 플래그 정보를 복호화하는 단계; 및
상기 변환 단위의 크기 정보와 상기 통합 코드 블록 플래그 정보를 기초로 분할 정보 플래그를 복호화하는 단계를 포함하는 쿼드 트리 구조를 이용한 변환 단위 정보 복호화 방법. - 제1 항에 있어서, 상기 변환 단위의 크기 정보와 상기 통합 코드 블록 플래그 정보를 기초로 분할 정보 플래그를 복호화하는 단계는,
상기 변환 단위에서 변환 계수가 존재하지 않는 경우, 상기 분할 정보 플래그 정보를 복호화하지 않고 상기 변환 단위의 코드 블록 플래그 정보를 복호화하는 단계; 및
상기 분할 정보 플래그를 기초로 상기 변환 단위가 추가로 분할되지 않는 경우, 상기 변환 단위의 코드 블록 플래그 정보를 복호화하는 단계를 포함하는 쿼드 트리 구조를 이용한 변환 단위 정보 복호화 방법. - 제1항에 있어서,
상기 변환 단위의 크기가 추가의 변환 단위로 분할되지 않는 최소 변환 단위와 동일한 경우, 상기 통합 코드 플래그 및 상기 분할 정보 플래그를 복호화하지 않고 상기 변환 단위의 코드 블록 플래그 정보를 복호화하는 단계를 더 포함하는 쿼드 트리 구조를 이용한 변환 단위 정보 복호화 방법. - 제1항에 있어서, 상기 통합 코드 블록 플래그는,
상기 통합 코드 블록 플래그가 적용되는 변환 깊이가 하나로 고정되어 고정된 변환 깊이에서만 상기 통합 코드 블록 플래그가 적용되거나 상기 변환 깊이가 소정의 파라메터로 정의되어 복수개의 변환 단위 깊이에서 적응되는 쿼드 트리 구조를 이용한 변환 단위 정보 복호화 방법. - 통합 코드 블록 플래그와 변환 정보 플래그가 결합되어 부호화된 변환 단위 정보 결합 플래그를 기초로 변환 단위의 패턴 정보를 복호화하는 단계; 및
상기 패턴 정보를 기초로 상기 패턴 정보에 해당하는 변환 단위의 코드 블록 플래그 정보 및 분할 정보 플래그 정보를 복호화하는 단계를 포함하는 쿼드 트리 구조를 이용한 변환 단위 정보 복호화 방법. - 제5항에 있어서, 상기 패턴 정보는,
소정의 변환 단위에 코드 블록 플래그가 존재하는 경우의 수와 분할 정보 플래그가 존재하는 경우의 수를 기초로 생성된 변수인 쿼드 트리 구조를 이용한 변환 단위 정보 복호화 방법. - 제5항에 있어서, 상기 패턴 정보는,
가변 길이 부호화를 이용한 테이블을 기초로 이진 부호화된 쿼드 트리 구조를 이용한 변환 단위 정보 복호화 방법. - 제5항에 있어서, 상기 패턴 정보는,
휘도 코드 블록 플래그값을 MSB(Most Significant Bit), cb 코드 블록 플래그를 MSB-1, cr 코드 블록 플래그를 MSB-2, split_flag를 LSB(Least Significant Bit)로 표현한 4비트 정보를 기초로 패턴 정보를 부호화한 것인 쿼드 트리 구조를 이용한 변환 단위 정보 복호화 방법.
- 통합 코드 블록 플래그 정보와 변환 단위의 크기 정보를 복호화하고, 상기 통합 코드 블록 플래그 정보와 상기 변환 단위의 크기 정보를 기초로 분할 정보 플래그를 복호화하고 상기 변환 단위의 변환 계수를 복호화하는 엔트로피 복호화부; 및
상기 엔트로피 복호화부로부터 제공받은 변환 단위의 변환 계수 정보를 역변환하는 역변환부를 포함하는 영상 복호화 장치. - 제9항에 있어서, 상기 엔트로피 복호화부는,
상기 변환 단위에서 변환 계수가 존재하지 않는 경우, 상기 분할 정보 플래그 정보를 복호화하지 않고 상기 변환 단위의 코드 블록 플래그 정보를 복호화하고 상기 분할 정보 플래그를 기초로 상기 변환 단위가 추가로 분할되지 않는 경우, 상기 변환 단위의 코드 블록 플래그 정보를 복호화하는 영상 복호화 장치. - 제9항에 있어서, 상기 엔트로피 복호화부는,
상기 변환 단위의 크기가 추가의 변환 단위로 분할되지 않는 최소 변환 단위와 동일한 경우, 상기 통합 코드 플래그 및 상기 분할 정보 플래그를 복호화하지 않고 상기 변환 단위의 코드 블록 플래그 정보를 복호화하는 영상 부호화 장치. - 통합 코드 블록 플래그와 변환 정보 플래그가 결합되어 부호화된 변환 단위 정보 결합 플래그를 기초로 변환 단위의 패턴 정보를 복호화하고 상기 패턴 정보를 기초로 상기 패턴 정보에 해당하는 변환 단위의 코드 블록 플래그 정보 및 분할 정보 플래그 정보를 복호화하는 엔트로피 복호화부; 및
상기 엔트로피 복호화부로부터 제공받은 변환 단위의 변환 계수 정보를 역변환하는 역변환부를 포함하는 영상 복호화 장치. - 제 12항에 있어서, 상기 패턴 정보는,
소정의 변환 단위에 코드 블록 플래그가 존재하는 경우의 수와 분할 정보 플래그가 존재하는 경우의 수를 기초로 생성된 변수인 영상 복호화 장치. - 제12항에 있어서, 상기 패턴 정보는,
가변 길이 부호화를 이용한 테이블을 기초로 이진 부호화된 쿼드 트리 구조를 이용한 영상 복호화 장치. - 제12항에 있어서, 상기 패턴 정보는,
휘도 코드 블록 플래그값을 MSB(Most Significant Bit), cb 코드 블록 플래그를 MSB-1, cr 코드 블록 플래그를 MSB-2, split_flag를 LSB(Least Significant Bit)로 표현한 4비트 정보를 기초로 패턴 정보를 부호화한 것인 쿼드 트리 구조를 이용한 영상 복호화 장치.
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JP2019033516A (ja) * | 2011-04-01 | 2019-02-28 | アイベックス・ピイティ・ホールディングス・カンパニー・リミテッド | イントラ予測モードにおける映像復号化方法 |
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