KR101576198B1 - Method and apparatus for video encoding based on scanning order of hierarchical data units, and method and apparatus for video decoding based on the same - Google Patents

Abstract

A picture is divided into coding units each having a predetermined maximum size, and for each of the maximum coding units, the coding unit is hierarchically divided into at least one depth-wise Determining a coding mode for a coding unit of coding depth including information on at least one coding depth at which a coding result is to be output by performing coding based on a data scanning order according to an absolute position and a relative position between coding units, A video coding method based on a scanning order of a hierarchical data unit for outputting information on a coding mode and encoded video data for each maximum coding unit is disclosed.

Description

TECHNICAL FIELD The present invention relates to a video coding method and apparatus, a video decoding method and a video coding method based on a scanning order of a hierarchical data unit, and a video decoding method and apparatus therefor }

The present invention relates to encoding and decoding of video.

Background of the Invention [0002] As the development and dissemination of hardware capable of playing back and storing high-resolution or high-definition video content increases the need for video codecs to effectively encode or decode high-definition or high-definition video content. According to the existing video codec, video is encoded according to a limited encoding method based on a macroblock of a predetermined size.

The present invention relates to video coding and decoding based on scanning orders according to absolute positions and relative positions of coding units and data units of a hierarchical structure.

According to an embodiment of the present invention, there is provided a video coding method based on a scanning order of a hierarchical data unit, the method comprising: dividing a picture into coding units of a predetermined maximum size; For each maximum coding unit, as the depth is deeper, the maximum coding unit is hierarchically divided and the data according to the absolute position and the relative position between at least one coding units for each depth according to the hierarchical structure Determining a coding mode for the coding unit of the coding depth including information on at least one coding depth at which the coding result is to be output by performing coding based on the scanning order; And outputting the information on the encoding mode and the encoded video data for each of the maximum encoding units.

According to an embodiment of the present invention, there is provided a video decoding method based on a scan order of hierarchical data units, the method comprising: receiving and parsing a bitstream of encoded video; Extracting information on a coding depth and an encoding mode and encoded video data for each maximum encoding unit from the bitstream; And an absolute position between at least one depth-dependent encoding unit according to the hierarchical structure, and an absolute position between at least one depth-based encoding unit according to the hierarchical structure, on the basis of information on the encoding depth and encoding mode for the maximum encoding unit, And decrypting the encoded video data based on a data scanning order according to a relative position.

Using the absolute position of the depth encoding unit in the picture or the relative position of the depth encoding unit with respect to the maximum encoding unit on the basis of the scan order of the hierarchical data unit according to an embodiment, The relative position of the depth-dependent coding unit with respect to the unit or the absolute position of the coding unit with depth may be determined.

In a relation between an upper coding unit and a lower coding unit among the depth coding units included in the current maximum coding unit based on the scanning order of the hierarchical data unit according to an embodiment, The relative position of the unit may be represented by an index of the predetermined lower-level coding unit based on a zigzag scanning order of the lower-level coding units included in the upper-level coding unit.

In a relation between an upper coding unit and a lower coding unit among the depth coding units included in the current maximum coding unit based on the scanning order of the hierarchical data unit according to an embodiment, The index for the current maximum encoding unit of the upper leftmost encoding unit of the predetermined lower-level encoding unit included in the upper-level encoding unit may be determined using the index for the current maximum encoding unit of the minimum encoding unit.

The minimum coding units included in the current prediction unit may be determined based on the scanning order of the hierarchical data unit according to one embodiment using the relative position with respect to the current maximum coding unit of the predetermined minimum coding unit included in the current prediction unit The relative position to the current maximum encoding unit may be determined.

The index of the current upper prediction unit of the current upper prediction unit and the index of the current upper prediction unit of the upper left minimum coding unit of the current prediction unit, Index or an index for the current maximum coding unit of the minimum coding unit in the inner left lower end of the current prediction unit may be determined.

According to an exemplary embodiment, an index determination method for the current maximum encoding unit may be distinguished according to a partition type and a partition index of a coding unit of the coding depth including the prediction unit.

The absolute position of the inner left upper coding unit of the current coding unit may be determined based on the relative position of the current coding unit with respect to the current largest coding unit based on the scanning order of the hierarchical data unit according to an embodiment .

The absolute position of the inner left uppermost encoding unit of the current prediction unit is calculated based on the relative position of the encoding unit of the current prediction unit with respect to the current maximum encoding unit based on the scan order of the hierarchical data unit according to an embodiment Can be determined.

In order to determine reference information for an arbitrary directional intra prediction according to an exemplary embodiment, the indexes based on the zigzag scanning order of the minimum coding unit included in the current prediction unit are used to determine the reference information of the neighboring minimum coding unit The index for the maximum encoding unit and the availability indicating whether the neighboring minimum encoding unit can be used as the reference information can be determined.

The prediction unit of the prediction unit according to the absolute position of the current maximum coding unit, the absolute position of the coding unit of the current coding depth, and the partition type and the relative position of the current prediction unit, It may be determined whether or not the prediction unit including the neighboring minimum coding unit is out of the picture.

The encoding depth and the encoding mode according to an exemplary embodiment may be configured such that in the encoding process for the video data, the maximum encoding unit is hierarchically divided for each maximum encoding unit, , The encoding mode may be determined as a depth at which the minimum encoding error occurs and an encoding mode as a result of performing encoding according to at least one encoding unit according to depth, at least one prediction unit, and encoding modes based on at least one conversion unit .

The encoded video data according to an exemplary embodiment may be a result of performing quantization and entropy encoding on transform coefficients in the encoding mode.

According to an embodiment of the present invention, there is provided a video encoding apparatus based on a scan order of hierarchical data units, the apparatus comprising: a maximum encoding unit division unit for dividing a picture into a plurality of encoding units each having a predetermined maximum size; For each maximum coding unit, as the depth is deeper, the maximum coding unit is hierarchically divided and the data according to the absolute position and the relative position between at least one coding units for each depth according to the hierarchical structure An encoding depth and encoding mode determining unit for determining an encoding mode for an encoding unit of the encoding depth including information on at least one encoding depth at which an encoding result is to be output by performing encoding based on a scan order; And a data output unit for outputting the information on the encoding mode and the encoded video data for each of the maximum encoding units.

According to an aspect of the present invention, there is provided an apparatus for decoding a video sequence based on a scan order of hierarchical data units, the apparatus comprising: a receiver for receiving and parsing a bitstream of encoded video; A data extracting unit for extracting information on a coding depth and a coding mode and encoded video data for each maximum coding unit from the bitstream; And an absolute position between at least one depth-dependent encoding unit according to the hierarchical structure, and an absolute position between at least one depth-based encoding unit according to the hierarchical structure, on the basis of information on the encoding depth and encoding mode for the maximum encoding unit, And a decoding unit decoding the encoded video data based on a data scanning order according to a relative position.

The present invention includes a computer-readable recording medium on which a program for implementing a video coding method based on a scan order of a hierarchical data unit according to an embodiment of the present invention is recorded. The present invention also includes a computer-readable recording medium on which a program for implementing a video decoding method based on a scan order of a hierarchical data unit according to an embodiment of the present invention is recorded.

1 shows a block diagram of a video encoding apparatus according to an embodiment of the present invention.
2 shows a block diagram of a video decoding apparatus according to an embodiment of the present invention.
FIG. 3 illustrates a concept of an encoding unit according to an embodiment of the present invention.
4 is a block diagram of an image encoding unit based on an encoding unit according to an embodiment of the present invention.
5 is a block diagram of an image decoding unit based on an encoding unit according to an embodiment of the present invention.
FIG. 6 illustrates a depth-based coding unit and a prediction unit according to an embodiment of the present invention.
FIG. 7 shows a relationship between an encoding unit and a conversion unit according to an embodiment of the present invention.
FIG. 8 illustrates depth-specific encoding information, in accordance with an embodiment of the present invention.
FIG. 9 shows a depth encoding unit according to an embodiment of the present invention.
FIGS. 10A, 10B, and 10C illustrate the relationship between an encoding unit, a prediction unit, and a frequency conversion unit according to an embodiment of the present invention.
FIG. 11 shows encoding information for each encoding unit according to an embodiment of the present invention.
12 shows a flowchart of a video coding method according to an embodiment of the present invention.
13 shows a flowchart of a video decoding method according to an embodiment of the present invention.
FIG. 14 shows a block diagram of a video encoding apparatus based on a scan order of a hierarchical data unit according to an embodiment of the present invention.
15 is a block diagram of a video decoding apparatus based on a scan order of a hierarchical data unit according to an embodiment of the present invention.
16 shows an index according to a zigzag scanning order of a hierarchical coding unit according to an embodiment.
FIG. 17 shows the relative positions of a maximum encoding unit, a hierarchical data unit, and a minimum encoding unit according to an embodiment. 18 shows neighboring prediction units for random directional intra prediction according to an embodiment.
FIG. 19 shows a location of a minimum encoding unit in a prediction unit of a size 2Nx2N and a partition type 2Nx2N according to an embodiment.
20 shows the location of the minimum encoding unit in the prediction unit of the size 2Nx2N and the partition type 2NxN according to an embodiment.
FIG. 21 shows a location of a minimum encoding unit in a prediction unit of a size 2Nx2N and a partition type Nx2N according to an embodiment.
22 shows a location of a minimum encoding unit in a prediction unit of a size 2Nx2N and a partition type NxN according to an embodiment.
23 shows the location of the minimum encoding unit in the prediction unit of the size 2Nx2N and the partition type 2NxnU according to an embodiment.
24 shows the location of the minimum encoding unit in the prediction unit of the size 2Nx2N and the partition type 2NxnD according to an embodiment.
25 shows a location of a minimum encoding unit in a prediction unit of size 2Nx2N and a partition type nLx2N according to an embodiment.
26 shows the location of a minimum encoding unit in a prediction unit of size 2Nx2N and a partition type nRx2N in accordance with an embodiment.
FIG. 27 shows a flowchart of a video coding method based on a scan order of hierarchical data units according to an embodiment of the present invention.
28 shows a flowchart of a video decoding method based on a scan order of a hierarchical data unit according to an embodiment of the present invention.

Hereinafter, a video encoding apparatus and a video decoding apparatus, a video encoding method, and a video decoding method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 20. The encoding and decoding of video based on spatially hierarchical data units according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 13, and with reference to FIGS. 14 to 20, The encoding of the video and the decoding of the video based on the scan order of the hierarchical data unit will be described below.

Hereinafter, a video encoding apparatus, a video encoding apparatus, a video encoding method, and a video decoding method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 13.

1 shows a block diagram of a video encoding apparatus according to an embodiment of the present invention.

The video coding apparatus 100 according to an embodiment includes a maximum coding unit division unit 110, a coding depth determination unit 120, and an output unit 130.

The maximum coding unit division unit 110 may divide a current picture based on a maximum coding unit which is a coding unit of a maximum size for a current picture of an image. If the current picture is larger than the maximum encoding unit, the image data of the current picture may be divided into at least one maximum encoding unit. The image data may be output to the coding depth determination unit 120 for each of at least one maximum coding unit.

An encoding unit according to an embodiment may be characterized by a maximum size and a depth. Depth indicates a stage in which coding units are hierarchically divided. As the depth increases, the depth coding units can be divided from the maximum coding unit to the minimum coding unit. The depth of the maximum encoding unit is the highest depth and the minimum encoding unit can be defined as the least significant encoding unit. As the depth of the maximum encoding unit increases, the size of the depth-dependent encoding unit decreases, so that the encoding unit of the higher depth may include a plurality of lower-depth encoding units.

As described above, according to the maximum size of an encoding unit, the image data of the current picture is divided into a maximum encoding unit, and each maximum encoding unit may include encoding units divided by depth. Since the maximum encoding unit according to an embodiment is divided by depth, image data of a spatial domain included in the maximum encoding unit can be hierarchically classified according to depth.

The maximum depth for limiting the total number of times the height and width of the maximum encoding unit can be hierarchically divided and the maximum size of the encoding unit may be preset.

The coding depth determiner 120 encodes at least one divided area in which the area of the maximum coding unit is divided for each depth, and determines the depth at which the final coding result is output for each of at least one of the divided areas. That is, the coding depth determination unit 120 selects the depth at which the smallest coding error occurs, and determines the coding depth as the coding depth by coding the image data in units of depth coding for each maximum coding unit of the current picture. The determined coding depth and the image data of each coding unit are output to the output unit 130.

The image data in the maximum encoding unit is encoded based on the depth encoding unit according to at least one depth below the maximum depth, and the encoding results based on the respective depth encoding units are compared. As a result of the comparison of the encoding error of the depth-dependent encoding unit, the depth with the smallest encoding error can be selected. At least one coding depth may be determined for each maximum coding unit.

As the depth of the maximum encoding unit increases, the encoding unit is hierarchically divided and divided, and the number of encoding units increases. In addition, even if encoding units of the same depth included in one maximum encoding unit, the encoding error of each data is measured and it is determined whether or not the encoding unit is divided into lower depths. Therefore, even if the data included in one maximum coding unit has a different coding error according to the position, the coding depth can be determined depending on the position. Accordingly, one or more coding depths may be set for one maximum coding unit, and data of the maximum coding unit may be divided according to one or more coding depth encoding units.

The predictive encoding and frequency conversion of the maximum encoding unit can be performed. Likewise, predictive coding and frequency conversion are performed on the basis of the depth coding unit for each maximum coding unit and for each depth below the maximum depth.

Since the number of coding units per depth is increased every time the maximum coding unit is divided by the depth, the coding including the predictive coding and the frequency conversion should be performed for every depth coding unit as the depth increases. For convenience of explanation, predictive coding and frequency conversion will be described based on a coding unit of a current depth among at least one maximum coding unit.

The video encoding apparatus 100 according to an exemplary embodiment may select various sizes or types of data units for encoding image data. To encode the image data, a layer such as predictive encoding, frequency conversion, and entropy encoding is used. The same data unit may be used for all steps, and the data unit may be changed step by step.

For example, the video coding apparatus 100 can select not only a coding unit for coding image data but also a data unit different from the coding unit in order to perform predictive coding of the image data of the coding unit.

For predictive coding of the maximum coding unit, predictive coding may be performed based on the partial data unit of the coding unit for each depth of the maximum coding unit. The partial data unit of the encoding unit may include a data unit in which at least one of the height and the width of the encoding unit and the depth encoding unit is divided.

For example, when the size of the encoding unit is 2Nx2N (where N is a positive integer), the size of the partial data unit may be 2Nx2N, 2NxN, Nx2N, NxN, and the like. Prediction coding may be performed based on data units of various types, in addition to data units of a type in which at least one of the height and the width of an encoding unit is divided by half. Hereinafter, a data unit on which prediction encoding is based may be referred to as a 'prediction unit'.

The prediction mode of the encoding unit may be at least one of an intra mode, an inter mode, and a skip mode. For example, the intra mode and the inter mode can be performed for prediction units of 2Nx2N, 2NxN, Nx2N, and NxN sizes. In addition, the skip mode can be performed only for a prediction unit of 2Nx2N size. Encoding is performed independently for each prediction unit within an encoding unit, and a prediction mode having the smallest encoding error can be selected.

In addition, the video encoding apparatus 100 according to an exemplary embodiment may perform frequency conversion of image data of an encoding unit based on not only an encoding unit for encoding image data but also a data unit different from the encoding unit.

For frequency conversion of a coding unit, frequency conversion may be performed based on a data unit having a size smaller than or equal to the coding unit. For example, a data unit for frequency conversion may include a data unit for intra mode and a data unit for inter mode. Hereinafter, the data unit on which the frequency conversion is based may be referred to as a 'conversion unit'.

The coding information according to the coding depth needs not only the coding depth but also prediction related information and frequency conversion related information. Therefore, the coding depth determiner 120 not only determines the coding depth at which the minimum coding error is generated, but also the partition type in which the coding unit of the coding depth is divided into prediction units, the prediction unit-specific prediction mode, Can be determined.

The coding depth determination unit 120 may measure the coding error of the depth-dependent coding unit using a Lagrangian Multiplier-based rate-distortion optimization technique.

The output unit 130 outputs, in the form of a bit stream, video data of the maximum encoding unit encoded based on at least one encoding depth determined by the encoding depth determination unit 120 and information on the depth encoding mode.

The encoded video data may be a result of encoding residual data of the video.

The information on the depth-dependent coding mode may include coding depth information, partition type information of a prediction unit of a coding unit of coding depth, prediction mode information per prediction unit, size information of a conversion unit, and the like.

The coding depth information can be defined using depth division information indicating whether or not coding is performed at the lower depth coding unit without coding at the current depth. If the current depth of the current encoding unit is the encoding depth, the current encoding unit is encoded in the current depth encoding unit, so that the division information of the current depth can be defined so as not to be further divided into lower depths. On the other hand, if the current depth of the current encoding unit is not the encoding depth, the encoding using the lower depth encoding unit should be tried. Therefore, the division information of the current depth may be defined to be divided into the lower depth encoding units.

If the current depth is not the encoding depth, encoding is performed on the encoding unit divided into lower-depth encoding units. Since there are one or more lower-level coding units in the current-depth coding unit, the coding is repeatedly performed for each lower-level coding unit so that recursive coding can be performed for each coding unit of the same depth.

At least one coding depth is determined in one maximum coding unit and at least one coding mode information is determined for each coding depth so that information on at least one coding mode can be determined for one maximum coding unit. Since the data of the maximum encoding unit is hierarchically divided according to the depth and the depth of encoding may be different for each position, information on the encoding depth and the encoding mode may be set for the data.

Accordingly, the output unit 130 according to the embodiment can set the corresponding encoding information for each minimum encoding unit included in the maximum encoding unit. That is, the coding unit of the coding depth includes at least one minimum coding unit that holds the same coding information. By using this, if the neighboring minimum encoding units have the same depth encoding information, it can be the minimum encoding unit included in the same maximum encoding unit.

For example, the encoding information output through the output unit 130 may be classified into encoding information per depth unit and encoding information per prediction unit. The under-coding-by-depth coding unit information may include prediction mode information and partition size information. The encoding information to be transmitted for each prediction unit includes information about the estimation direction of the inter mode, information about the reference picture index of the inter mode, information on the motion vector, information on the chroma component of the intra mode, information on the interpolation mode of the intra mode And the like. Information on the maximum size of a coding unit defined for each picture, slice or GOP, and information on the maximum depth can be inserted into the header of the bitstream.

According to the simplest embodiment of the video coding apparatus 100, the coding unit for depth is a coding unit which is half the height and width of the coding unit of one layer higher depth. That is, if the size of the current depth encoding unit is 2Nx2N, the size of the lower depth encoding unit is NxN. In addition, the current encoding unit of 2Nx2N size can include a maximum of 4 sub-depth encoding units of NxN size.

Therefore, the video decoding apparatus 100 according to an embodiment determines an encoding unit of an optimal shape and size for each maximum encoding unit based on the size and the maximum depth of the maximum encoding unit determined in consideration of the characteristics of the current picture . In addition, since each encoding unit can be encoded by various prediction modes, frequency conversion methods, and the like, an optimal encoding mode can be determined in consideration of image characteristics of encoding units of various image sizes.

Therefore, if an image having a very high image resolution or a very large data amount is encoded in units of existing macroblocks, the number of macroblocks per picture becomes excessively large. This increases the amount of compression information generated for each macroblock, so that the burden of transmission of compressed information increases and the data compression efficiency tends to decrease. Therefore, the video encoding apparatus according to an embodiment can increase the maximum size of the encoding unit in consideration of the image size, and adjust the encoding unit in consideration of the image characteristic, so that the image compression efficiency can be increased.

2 shows a block diagram of a video decoding apparatus according to an embodiment of the present invention.

The video decoding apparatus 200 includes a receiving unit 210, an image data and encoding information extracting unit 220, and an image data decoding unit 230. The definition of various terms such as coding unit, depth, prediction unit, conversion unit, and information on various coding modes for various processing of the video decoding apparatus 200 according to an embodiment is the same as that of FIG. 1 and the video coding apparatus 100 Are the same as described above.

The receiving unit 205 receives and parses the bitstream of the encoded video. The image data and encoding information extracting unit 220 extracts image data for each maximum encoding unit from the parsed bit stream and outputs the extracted image data to the image data decoding unit 230. The image data and encoding information extracting unit 220 can extract information on the maximum size of the encoding unit of the current picture from the header of the current picture.

Also, the image data and encoding information extracting unit 220 extracts information on the encoding depth and the encoding mode for each maximum encoding unit from the parsed bitstream. The information on the extracted coding depth and coding mode is output to the image data decoding unit 230. That is, the video data of the bit stream can be divided into the maximum encoding units, and the video data decoding unit 230 can decode the video data per maximum encoding unit.

Information on the coding depth and the coding mode per coding unit can be set for one or more coding depth information, and the information on the coding mode for each coding depth includes information on partition type information, prediction mode information, Size information of the conversion unit, and the like. In addition, as the encoding depth information, depth-based segmentation information may be extracted.

The encoding depth and encoding mode information extracted by the image data and encoding information extracting unit 220 may be encoded in the encoding unit such as the video encoding apparatus 100 according to one embodiment, And information on the coding depth and coding mode determined to repeatedly perform coding for each unit to generate the minimum coding error. Therefore, the video decoding apparatus 200 can decode the data according to the coding scheme that generates the minimum coding error to recover the video.

The image data and encoding information extracting unit 220 can extract information on the encoding depth and the encoding mode for each minimum encoding unit. If information on the coding depth and the coding mode of the corresponding maximum coding unit is recorded for each minimum coding unit, the minimum coding units having the same coding depth and information on the coding mode are estimated as data units included in the same maximum coding unit . That is, if the minimum coding units of the same information are collected and decoded, it is possible to decode based on the coding units of the coding depth with the smallest coding error.

The image data decoding unit 230 decodes the image data of each maximum encoding unit based on the information on the encoding depth and the encoding mode for each maximum encoding unit to reconstruct the current picture. The image data decoding unit 230 can decode the image data for each coding unit of at least one coding depth based on the coding depth information for each coding unit. The decoding process may include a prediction process including intra prediction and motion compensation, and an inverse frequency conversion process.

The image data decoding unit 230 decodes each of the prediction units and prediction modes for each coding unit on the basis of the partition type information and the prediction mode information of the prediction unit of the coding unit for each coding depth for each coding unit, Or motion compensation.

In addition, the image data decoding unit 230 may perform frequency inverse transform for each encoding unit on the basis of the size information of the conversion unit of each encoding depth-based encoding unit for frequency inverse conversion for each maximum encoding unit .

The image data decoding unit 230 can determine the coding depth of the current maximum encoding unit using the division information by depth. If the partition information indicates that the current depth is to be decoded, the current depth is the depth of the encoding. Therefore, the image data decoding unit 230 can decode the current depth encoding unit for the image data of the current maximum encoding unit using the partition type, the prediction mode, and the conversion unit size information of the prediction unit.

That is, it is possible to observe the encoding information set for the minimum encoding unit and to decode the minimum encoding units that hold the encoding information including the same division information, into one data unit.

The video decoding apparatus 200 according to an exemplary embodiment recursively performs encoding for each maximum encoding unit in the encoding process to obtain information on an encoding unit that has generated the minimum encoding error and can use the encoded information for decoding the current picture have. That is, it is possible to decode video data in the optimal encoding unit for each maximum encoding unit.

Accordingly, even if an image with a high resolution or an excessively large amount of data is used, the information on the optimal encoding mode transmitted from the encoding end is used, and the image data is efficiently encoded according to the encoding unit size and encoding mode, Can be decoded and restored.

FIG. 3 shows the concept of a hierarchical coding unit.

An example of an encoding unit may include 32x32, 16x16, 8x8, and 4x4 from an encoding unit with a width x height of 64x64. In addition to the square-shaped encoding units, there may be encoding units whose width x height is 64x32, 32x64, 32x16, 16x32, 16x8, 8x16, 8x4, 4x8.

With respect to the video data 310, the resolution is set to 1920 x 1080, the maximum size of the encoding unit is set to 64, and the maximum depth is set to 2. With respect to the video data 320, the resolution is set to 1920 x 1080, the maximum size of the encoding unit is set to 64, and the maximum depth is set to 4. With respect to the video data 330, the resolution is set to 352 x 288, the maximum size of the encoding unit is set to 16, and the maximum depth is set to 2.

It is preferable that the maximum size of the coding size is relatively large in order to improve the coding efficiency as well as to accurately characterize the image characteristics when the resolution or the data amount is large. Therefore, the maximum size of the video data 310 and 320 having the higher resolution than the video data 330 can be selected to be 64. FIG.

The maximum depth indicates the total number of layers in the hierarchical encoding unit. Therefore, since the maximum depth of the video data 310 is 2, the encoding unit 315 of the video data 310 is encoded from a maximum encoding unit having a major axis size of 64, Units. On the other hand, since the maximum depth of the video data 330 is 2, the encoding unit 335 of the video data 330 has a depth of two layers from the encoding units having the major axis size of 16, Units.

Since the maximum depth of the video data 320 is 4, the encoding unit 325 of the video data 320 has a depth of four layers from 32 to 16, 8, and 4 Encoding units. The deeper the depth, the better the ability to express detail.

4 is a block diagram of an image encoding unit based on an encoding unit according to an embodiment of the present invention.

The image encoding unit 400 according to an exemplary embodiment includes operations to encode image data in the encoding depth determination unit 120 of the video encoding apparatus 100. That is, the intraprediction unit 410 performs intraprediction on the intra-mode encoding unit of the current frame 405, and the motion estimation unit 420 and the motion compensation unit 425 perform intraprediction on the current frame 405 of the inter- And a reference frame 495. The inter-frame estimation and the motion compensation are performed using the reference frame and the reference frame.

The data output from the intraprediction unit 410, the motion estimation unit 420 and the motion compensation unit 425 is output as a quantized transform coefficient through the frequency transform unit 430 and the quantization unit 440. The quantized transform coefficients are reconstructed into spatial domain data through the inverse quantization unit 460 and the frequency inverse transform unit 470 and the data of the reconstructed spatial domain is passed through the deblocking unit 480 and the loop filtering unit 490 Processed and output to the reference frame 495. [ The quantized transform coefficient may be output to the bitstream 455 via the entropy encoding unit 450.

The motion estimation unit 420, the motion compensation unit 425, and the frequency transformation unit 420, which are components of the image encoding unit 400, are applied to the video encoding apparatus 100 according to an embodiment of the present invention. The quantization unit 440, the entropy encoding unit 450, the inverse quantization unit 460, the frequency inverse transform unit 470, the deblocking unit 480, and the loop filtering unit 490, The work should be performed based on the depth encoding unit considering the maximum depth.

In particular, the intra prediction unit 410, the motion estimation unit 420, and the motion compensation unit 425 determine the prediction unit and the prediction mode in the coding unit in consideration of the maximum size and depth of the coding unit, and the frequency conversion unit 430 ) Should consider the size of the conversion unit considering the maximum size and depth of the encoding unit.

5 is a block diagram of an image decoding unit based on an encoding unit according to an embodiment of the present invention.

The bit stream 505 passes through the parsing unit 510 and the encoded video data to be decoded and the encoding-related information necessary for decoding are parsed. The encoded video data is output as inverse quantized data through the entropy decoding unit 520 and the inverse quantization unit 530, and the image data in the spatial domain is restored through the frequency inverse transform unit 540.

The intra-prediction unit 550 performs intraprediction on the intra-mode encoding unit for the video data in the spatial domain, and the motion compensating unit 560 performs intra-prediction on the intra-mode encoding unit using the reference frame 585 And performs motion compensation for the motion compensation.

The data in the spatial domain that has passed through the intra prediction unit 550 and the motion compensation unit 560 may be post-processed through the deblocking unit 570 and the loop filtering unit 580 and output to the reconstruction frame 595. Further, the post-processed data via deblocking unit 570 and loop filtering unit 580 may be output as reference frame 585.

In order to decode the image data in the image data decoding unit 230 of the video decoding apparatus 200, operations after the parsing unit 510 of the image decoding unit 500 according to the embodiment may be performed.

The entropy decoding unit 520, the inverse quantization unit 530, and the frequency inverse transforming unit 520, which are the components of the video decoding unit 500, in order to be applied to the video decoding apparatus 200 according to one embodiment. The intraprediction unit 550, the motion compensation unit 560, the deblocking unit 570 and the loop filtering unit 580 all have to perform an operation based on the encoding unit of the encoding depth for each maximum encoding unit .

In particular, the intra prediction unit 550 and the motion compensation unit 560 determine a coding unit and a prediction mode in consideration of the maximum size and depth of a coding unit, and the frequency inverse transform unit 540 sets the maximum size and depth of the coding unit The size of the conversion unit should be considered.

FIG. 6 illustrates a depth-based coding unit and a prediction unit according to an embodiment of the present invention.

The video encoding apparatus 100 and the video decoding apparatus 200 according to an exemplary embodiment use a hierarchical encoding unit to consider an image characteristic. The maximum height, width, and maximum depth of the encoding unit may be adaptively determined according to the characteristics of the image, or may be variously set according to the demand of the user. The size of each coding unit may be determined according to the maximum size of a predetermined coding unit.

The hierarchical structure 600 of the encoding unit according to an embodiment shows a case where the maximum height and width of the encoding unit is 64 and the maximum depth is 4. Since the depth is deeper along the vertical axis of the hierarchical structure 600 of the encoding unit according to the embodiment, the height and width of the encoding unit for each depth are divided. In addition, along the horizontal axis of the hierarchical structure 600 of the coding unit, a prediction unit which is a partial data unit on which prediction coding of each depth coding unit is based is shown.

That is, the coding unit 610 is the largest coding unit among the hierarchical structures 600 of the coding units and has a depth of 0, and the size of the coding units, that is, the height and the width, is 64x64. A depth-1 encoding unit 620 having a size of 32x32, a depth-2 encoding unit 620 having a size 16x16, a depth-3 encoding unit 640 having a size 8x8, a depth 4x4 having a size 4x4, There is an encoding unit 650. An encoding unit 650 of depth 4 of size 4x4 is the minimum encoding unit.

The partial data units are arranged as a prediction unit of the encoding unit along the horizontal axis for each depth. That is, the prediction unit of the encoding unit 610 having a size of 64x64 with a depth of 0 is a partial data unit 610 having a size of 64x64, partial data units 612 having a size of 64x32 included in the encoding unit 610 of size 64x64, Partial data units 614 of size 32x64, and partial data units 616 of size 32x32. Conversely, the encoding unit may be a minimum-sized square data unit including the conversion units 610, 612, 614, and 616.

Likewise, the prediction unit of the encoding unit 620 of the size 32x32 of the depth 1 is the partial data unit 620 of the size 32x32, the partial data units 622 of the size 32x16, and the partial data unit 620 of the size 32x32 included in the encoding unit 620 of the size 32x32, Partial data units 624 of size 16x32, partial data units 626 of size 16x16.

Likewise, the prediction unit of a 16x16 size 16x16 encoding unit is a 16x16 partial data unit 630, a 16x8 partial data unit 632, and a 16x16 partial data unit 630 included in the 16x16 encoding unit 630, Partial data units 634 of size 8x16, and partial data units 636 of size 8x8.

Likewise, the prediction unit of the encoding unit 640 of the size 8x8 of the depth 3 includes the partial data unit 640 of the size 8x8, the partial data units 642 of the size 8x4, and the partial data units 640 of the size 8x8 included in the encoding unit 640 of the size 8x8, Partial data units 644 of size 4x8, and partial data units 646 of size 4x4.

Finally, a coding unit 650 of size 4x4 is the minimum coding unit and the coding unit of the lowest depth, and the prediction unit is a data unit 650 of size 4x4.

The coding depth determiner 120 of the video coding apparatus 100 according to an exemplary embodiment of the present invention determines the coding depth of the maximum coding unit 610 by multiplying the coding unit of each depth included in the maximum coding unit 610 Encoding is performed.

The number of coding units per depth to include data of the same range and size increases as the depth of the coding unit increases. For example, for data containing one coding unit at depth 1, four coding units at depth 2 are required. Therefore, in order to compare the encoding results of the same data by depth, they should be encoded using a single depth 1 encoding unit and four depth 2 encoding units, respectively.

For each depth-of-field coding, encoding is performed for each prediction unit of the depth-dependent coding unit along the horizontal axis of the hierarchical structure 600 of the coding unit, and a representative coding error, which is the smallest coding error at the corresponding depth, is selected . In addition, depths are deepened along the vertical axis of the hierarchical structure 600 of encoding units, and the minimum encoding errors can be retrieved by comparing the representative encoding errors per depth by performing encoding for each depth. The depth at which the minimum coding error occurs among the maximum coding units 610 can be selected as the coding depth and the partition type of the maximum coding unit 610. [

FIG. 7 shows a relationship between an encoding unit and a conversion unit according to an embodiment of the present invention.

The video coding apparatus 100 or the video decoding apparatus 200 according to an embodiment encodes or decodes an image in units of coding units smaller than or equal to the maximum coding unit for each maximum coding unit. The size of the conversion unit for frequency conversion during encoding can be selected based on data units that are not larger than the respective encoding units.

For example, in the video encoding apparatus 100 or the video encoding apparatus 200 according to an embodiment, when the current encoding unit 710 is 64x64 size, the 32x32 conversion unit 720 The frequency conversion can be performed.

In addition, the data of the encoding unit 710 of 64x64 size is encoded by performing the frequency conversion with the conversion units of 32x32, 16x16, 8x8, and 4x4 size of 64x64 or smaller, respectively, and then the conversion unit having the smallest error with the original Can be selected.

FIG. 8 illustrates depth-specific encoding information, in accordance with an embodiment of the present invention.

The encoding information encoding unit of the video encoding apparatus 100 according to the embodiment is information on an encoding mode, and includes information on a partition type 800, information on a prediction mode 810, Information 820 on the unit size can be encoded and transmitted.

The partition type information 800 indicates information on a type in which the current encoding unit is divided as a prediction unit for predictive encoding of the current encoding unit. For example, the current encoding unit CU_0 of depth 0 and size 2Nx2N includes a prediction unit 802 of size 2Nx2N, a prediction unit 804 of size 2NxN, a prediction unit 806 of size Nx2N, a prediction unit 808 of size NxN ) And can be used as a prediction unit. In this case, information 800 regarding the partition type of the current encoding unit includes a prediction unit 802 of size 2Nx2N, a prediction unit 804 of size 2NxN, a prediction unit 806 of size Nx2N, and a prediction unit 808 of size NxN. Lt; / RTI >

The information 810 on the prediction mode indicates the prediction mode of each prediction unit. The prediction unit indicated by the information 800 relating to the partition type is predicted to be one of the intra mode 812, the inter mode 814 and the skip mode 816 through the prediction mode information 810, for example. Can be set.

In addition, the information 820 on the conversion unit size indicates whether to perform frequency conversion on the basis of which conversion unit the current encoding unit is performed. For example, the conversion unit may be one of a first intra-conversion unit size 822, a second intra-conversion unit size 824, a first inter-conversion unit size 826, have.

The encoding information extracting unit of the video decoding apparatus 200 according to the embodiment extracts the information 800 about the partition type, the information 810 about the prediction mode, the information 820 about the conversion unit size ) Can be extracted and used for decoding.

FIG. 9 shows a depth encoding unit according to an embodiment of the present invention.

Partition information may be used to indicate changes in depth. The division information indicates whether the current-depth encoding unit is divided into lower-depth encoding units.

The prediction unit 910 for the prediction encoding of the coding units of depth 0 and 2N_0x2N_0 has a partition type 912 of 2N_0x2N_0 size, a partition type 914 of 2N_0xN_0 size, a partition type 916 of N_0x2N_0 size, a partition of size N_0xN_0 Type < / RTI >

For each partition type, predictive encoding should be repeatedly performed for each prediction unit of 2N_0x2N_0 size, two 2N_0xN_0 size prediction units, two N_0x2N_0 size prediction units, and four N_0xN_0 size prediction units. For a prediction unit of size 2N_0x2N_0, size N_0x2N_0, size 2N_0xN_0, and size N_0xN_0, predictive coding may be performed in intra mode and inter mode. The skip mode can be performed only for predictive encoding in a prediction unit of size 2N_0x2N_0.

If the coding error by the partition type 918 of the size N_0xN_0 is the smallest, the depth 0 is changed to 1 (920), and the coding units 922, 924, 926 and 928 of the partition type of the depth 2 and the size N_0xN_0 are changed The minimum coding error can be repeatedly searched for.

Since encoding is repeatedly performed on the encoding units 922, 924, 926, and 928 of the same depth, encoding of only one of the encoding units of depth 1, for example, will be described. The prediction unit 930 for predicting the coding unit of the depth 1 and the size 2N_1x2N_1 (= N_0xN_0) includes a partition type 932 of size 2N_1x2N_1, a partition type 934 of size 2N_1xN_1, a partition type 936 of size N_1x2N_1, , And a partition type 938 of size N_1xN_1. For each partition type, predictive coding should be repeatedly performed for each prediction unit of a size 2N_1x2N_1, a prediction unit of two sizes 2N_1xN_1, a prediction unit of two sizes N_1x2N_1, and a prediction unit of four sizes N_1xN_1.

If the coding error by the partition type 938 of the size N_1xN_1 is the smallest, the coding units 942, 944, 946 and 948 of the depth 2 and the size N_2xN_2 are changed while changing the depth 1 to the depth 2 (940) The minimum coding error can be repeatedly searched for.

If the maximum depth is d, the depth-based segmentation information can be set until the depth d-1. That is, the prediction unit 950 for predictive coding of the coding unit of the depth d-1 and the size 2N_ (d-1) x2N_ (d-1) A partition type 954 of size 2N_ (d-1) xN_ (d-1), a partition type 956 of size N_ (d-1) x2N_ 1) xN_ (d-1) < / RTI >

(D-1) x2N_ (d-1), two predicted units of two sizes 2N_ (d-1) (d-1) x2N_ (d-1), four sizes N_ (d-1) xN_ (d-1). Since the maximum depth is d, the coding unit 952 of depth d-1 no longer undergoes the division process.

The video coding apparatus 100 according to an exemplary embodiment compares depth-based coding errors to determine the depth of coding for the coding unit 912, and selects the depth at which the smallest coding error occurs.

For example, a coding error for a coding unit of depth 0 is predicted for each partition type 912, 914, 916, and 918, and a prediction unit in which the smallest coding error occurs is determined. Similarly, a prediction unit having the smallest coding error can be searched for every depth 0, 1, ..., d-1. At the depth d, the coding error can be determined through predictive coding based on the prediction unit 960, which is a coding unit of size 2N_dx2N_d.

In this way, the minimum coding error of each of the depths 0, 1, ..., d-1, and d is compared and the depth with the smallest error is selected to be determined as the coding depth. The coding depth and the prediction unit of the corresponding depth can be encoded and transmitted as information on the coding mode. In addition, since the coding unit must be divided from the depth 0 to the coding depth, only the division information of the coding depth is set to '0', and the division information by depth is set to '1' except for the coding depth.

The encoding information extracting unit 220 of the video decoding apparatus 200 according to an exemplary embodiment may extract information on the encoding depth and prediction unit of the encoding unit 912 and decode the encoding unit 912. [ The video decoding apparatus 200 according to an exemplary embodiment of the present invention uses division information by depth to grasp the depth with the division information of '0' as a coding depth and can use it for decoding using information on the coding mode for the corresponding depth have.

FIGS. 10A, 10B, and 10C illustrate the relationship between an encoding unit, a prediction unit, and a frequency conversion unit according to an embodiment of the present invention.

The coding unit 1010 is coding units for coding depth determined by the video coding apparatus 100 according to the embodiment with respect to the maximum coding unit. The prediction unit 1060 is a prediction unit of each coding depth unit among the coding units 1010 and the conversion unit 1070 is a conversion unit of each coding depth unit.

When the depth of the maximum encoding unit is 0, the depth of the encoding units 1012 and 1054 is 1 and the depth of the encoding units 1014, 1016, 1018, 1028, 1050, The coding units 1020, 1022, 1024, 1026, 1030, 1032 and 1048 have a depth of 3 and the coding units 1040, 1042, 1044 and 1046 have a depth of 4.

A portion (1014, 1016, 1022, 1032, 1048, 1050, 1052, 1054) of the prediction units 1060 is a type in which the coding unit is divided. That is, the prediction units 1014, 1022, 1050 and 1054 are partition types of 2NxN, the prediction units 1016, 1048 and 1052 are partition types of Nx2N, and the prediction units 1032 are partition types of NxN. That is, the prediction unit of the depth-dependent coding units 1010 is smaller than or equal to each coding unit.

The image data of a part 1052 of the conversion units 1070 is subjected to frequency conversion or frequency inverse conversion in units of data smaller in size than the encoding unit. The conversion units 1014, 1016, 1022, 1032, 1048, 1050, 1052, and 1054 are data units of different sizes or types when compared with the prediction units of the prediction units 1060. That is, the video encoding apparatus 100 according to the embodiment and the video decoding apparatus 200 according to an embodiment can perform the intra prediction / motion estimation / motion compensation operation for the same encoding unit and the frequency conversion / , Each based on a separate data unit.

FIG. 11 shows encoding information for each encoding unit according to an embodiment of the present invention.

The output unit 130 of the video encoding apparatus 100 according to an exemplary embodiment outputs encoding information for each encoding unit and the encoding information extracting unit 220 of the video decoding apparatus 200 according to an exemplary embodiment extracts encoding information for each encoding unit It is possible to extract the encoding information.

The encoding information may include division information for the encoding unit, partition type information, prediction mode information, and conversion unit size information. The encoding information shown in FIG. 11 is an example that can be set in the video encoding apparatus 100 according to the embodiment and the video encoding apparatus 200 according to an embodiment.

The division information may indicate the coding depth of the corresponding encoding unit. That is, since depths that are no longer divided according to the division information are coding depths, partition type information, prediction mode, and conversion unit size information can be defined with respect to the coding depth. When it is necessary to further divide by one division according to the division information, encoding should be performed independently for each of four divided sub-depth coding units.

As the partition type information, the partition type of the conversion unit of the coding unit of the coding depth can be represented by 2Nx2N, 2NxN, Nx2N and NxN. The prediction mode may be represented by one of an intra mode, an inter mode, and a skip mode. The intra mode and the inter mode can be defined in the partition types 2Nx2N, 2NxN, Nx2N and NxN, and the skip mode can be defined only in the partition type 2Nx2N. The conversion unit size can be set to two kinds of sizes in the intra mode and two kinds of sizes in the inter mode.

The encoding unit-specific encoding information of the belonging encoding depth may be stored for each minimum encoding unit in the encoding unit. Therefore, if encoding information held in each of the adjacent minimum encoding units is checked, it can be confirmed whether or not the encoding information is included in the encoding unit of the same encoding depth. In addition, since the encoding unit of the encoding depth can be identified by using the encoding information held in the minimum encoding unit, the distribution of encoding depths in the maximum encoding unit can be inferred.

In this case, when the current encoding unit is predicted with reference to the neighboring data unit, the encoding information of the minimum encoding unit in the depth encoding unit adjacent to the current encoding unit is directly used, so that the data of the minimum encoding unit can be referred to.

In yet another embodiment, the encoding information of the depth encoding unit may be stored only for the minimum encoding unit represented in the depth encoding unit. In this case, when the current encoding unit is predicted by referring to the surrounding encoding unit, the data adjacent to the current encoding unit in the depth encoding unit may be retrieved using the encoding information of the adjacent depth encoding unit.

12 shows a flowchart of a video coding method according to an embodiment of the present invention.

In step 1210, the current picture is divided into at least one maximum encoding unit. In addition, the maximum depth indicating the possible total number of divisions may be set in advance.

In step 1220, the area of the maximum coding unit is coded at least in one divided area for each depth, and the depth at which the final coding result is output for each of at least one of the divided areas is determined. The maximum encoding unit is divided into stages, and each time the depth is deepened, it is necessary to repeatedly perform encoding for each lower-depth encoding unit.

For each depth-based coding unit, the conversion unit for each partition type having the smallest coding error should be determined. In order to determine the coding depth that causes the minimum coding error of the coding unit, the coding error should be measured and compared for each coding unit of each depth.

In step 1230, video data as a final encoding result for each of at least one divided area and information on the coding depth and coding mode are output for each maximum coding unit. The information on the encoding mode may include information on the encoding depth or division information, partition type information of the encoding depth, prediction mode information, and conversion unit size information. Information on the encoded encoding mode can be transmitted to the decoding end together with the encoded video data.

13 shows a flowchart of a video decoding method according to an embodiment of the present invention.

In step 1310, the bitstream for the encoded video is received and parsed.

In step 1320, the image data of the current picture allocated to the largest coding unit of the maximum size from the parsed bitstream, and information on the coding depth and coding mode of each coding unit are extracted. The coding depth for each maximum coding unit is the depth selected with the smallest coding error for each maximum coding unit in the process of coding the current picture. The encoding of the maximum encoding unit is the image data encoded based on at least one data unit obtained by dividing the maximum encoding unit hierarchically by depth. Accordingly, the decoding efficiency of the image can be improved by decoding each image data after grasping the coding depth for each coding unit.

In step 1330, the image data of each maximum encoding unit is decoded based on the information on the encoding depth and the encoding mode for each maximum encoding unit. The decoded image data can be reproduced by a reproducing apparatus, stored in a storage medium, or transmitted via a network.

Hereinafter, a video encoding apparatus and a video decoding apparatus, a video encoding method, and a video decoding method based on a scan order of a hierarchical data unit according to an embodiment of the present invention will be described with reference to FIG. 14 to FIG.

FIG. 14 shows a block diagram of a video encoding apparatus based on a scan order of a hierarchical data unit according to an embodiment of the present invention.

The video encoding apparatus 1400 based on the scan order of the hierarchical data unit includes a maximum encoding unit division unit 1410, an encoding depth and encoding mode determination unit 1420, and a data output unit 1430 . The image encoding apparatus 1400 based on the scan order of the hierarchical data unit according to an embodiment of the present invention is a specific embodiment of the image encoding apparatus 100 according to an embodiment, The maximum coding unit dividing unit 110, the coding depth determining unit 120 and the output unit 130 are divided into a maximum coding unit division unit 1410, a coding depth and coding mode determination unit 1420, (1430).

The maximum coding unit division unit 1410 according to an embodiment divides a picture of an input picture into a maximum coding unit of a predetermined size and outputs the picture data of the maximum coding unit to the coding depth and coding mode decision unit 1420 .

The coding depth and coding mode decision unit 1420 according to an embodiment divides the areas of the maximum coding unit input from the maximum coding unit division unit 1410 hierarchically according to deeper depth, And performs coding based on the depth-dependent coding units according to depths corresponding to the number of divisions independently for each area.

Also, the encoding based on each depth-based encoding unit may be performed based on prediction units based on prediction units of all types and sizes that are less than or equal to the depth-based encoding unit, and conversions based on the conversion units of all sizes smaller than or equal to the depth- Lt; / RTI >

Accordingly, the coding depth and coding mode determiner 1420 according to the embodiment can determine the partition type, the prediction mode, and the size of the conversion unit of the coding unit of at least one coding depth and coding depth to which the coding result is to be output have. Information related to the coding unit of the coding depth determined in this way can be determined as information on the coding mode.

The encoding depth and encoding mode determination unit 1420 according to an embodiment determines the encoding depth and the encoding mode to output the encoding result for each independent region of the maximum encoding unit, The encoding depth and the encoding mode related to the encoding depth with the minimum encoding error with the original image data can be searched.

According to one embodiment, the encoding order for the largest encoding unit is in accordance with the raster scan order. The coding units of the hierarchical depth in the maximum coding unit can be scanned in the zigzag scanning order among the depth coding units of the same depth by depth. The encoding order of the minimum encoding unit within the maximum encoding unit may follow a zigzag scan order or a raster scan order.

The relationship between the upper coding unit and the lower coding unit among the coding units of depth included in the maximum coding unit according to the zigzag scanning order will be exemplified. The relative position of a predetermined lower coding unit with respect to the upper coding unit may be represented by an index of a predetermined lower coding unit based on a zigzag scanning order of the lower coding units included in the upper coding unit.

Hereinafter, the index of the lower data unit with respect to the upper data unit is interpreted as indicating the scan order according to the zigzag scan order among lower data units of the same level among the upper data units.

For example, the coding depth and coding mode determiner 1420 according to an embodiment uses the index of the coding unit of a predetermined depth in the maximum coding unit as the relative positions of the coding units of the predetermined depth included in the maximum coding unit . Also, the coding depth and coding mode determiner 1420 according to an exemplary embodiment may use the indexes of the minimum coding units of the maximum coding unit as the relative positions of the minimum coding units for the maximum coding unit.

In addition, the coding depth and coding mode determination unit 1420 according to an embodiment converts the relative position of the upper data unit of the lower data unit defined according to the zigzag scanning order to the absolute position of the lower data unit on the current picture . Conversely, the coding depth and coding mode decision unit 1420 according to the embodiment transforms the absolute position of the lower data unit on the current picture into the relative position of the lower data unit with respect to the upper data unit defined according to the zigzag scanning order can do. An example of an absolute position of a predetermined data unit may be an x coordinate value and a y coordinate value of an upper left upper pixel of a predetermined data unit on a current picture.

Based on a hierarchical structure between a data unit such as a maximum coding unit, a depth coding unit, a coding depth coding unit, a prediction unit, and a minimum coding unit according to an embodiment, the upper coding unit and the lower coding unit Relative positions between units may be mutually transformed.

The coding depth and coding mode decision unit 1420 according to the embodiment can determine the relative positions of the sub-coding units with respect to the current maximum coding unit by using the relative positions of the upper coding units with respect to the current maximum coding unit. In addition, the coding depth and coding mode decision unit 1420 according to the embodiment can determine the absolute position of the lower coding unit in the current picture by using the relative position of the upper coding unit with respect to the current maximum coding unit.

In addition, the coding depth and coding mode decision unit 1420 according to the embodiment can determine the relative position of the lower coding unit with respect to the current maximum coding unit by using the absolute position of the upper coding unit in the current picture. In addition, the coding depth and coding mode decision unit 1420 according to the embodiment can determine the absolute position of the lower coding unit in the current picture by using the absolute position of the upper coding unit in the current picture.

The coding depth and coding mode decision unit 1420 according to the embodiment defines the relation between the upper coding unit and the lower coding unit among the coding units of the depth included in the current maximum coding unit, An index for the current maximum encoding unit of the minimum encoding unit located at the top can be used. For example, the coding depth and coding mode decision unit 1420 according to an embodiment uses the index for the current maximum coding unit of the upper left minimum coding unit of the upper left coding unit, It is possible to determine an index for the current maximum encoding unit of the minimum leftmost encoding unit of the inner left upper side of the predetermined lower-level encoding unit.

The coding depth and coding mode determination unit 1420 according to an embodiment uses the relative positions of the predetermined minimum coding units included in the current prediction unit with respect to the current maximum coding unit to determine the minimum coding units included in the current prediction unit The relative position with respect to the current maximum encoding unit can be determined.

For example, the coding depth and coding mode determination unit 1420 according to an embodiment uses an index for the current maximum coding unit of the upper left minimum coding unit of the current upper left prediction unit, The index for the current maximum encoding unit of the minimum encoding unit of the current prediction unit or the index for the current maximum encoding unit of the minimum left encoding unit of the current left prediction unit.

The coding depth and coding mode determiner 1420 according to the embodiment can distinguish the index determination method for the current maximum coding unit according to the partition type and the partition index of the coding unit of the coding depth including the prediction unit . The partition type according to an embodiment may be divided into asymmetric partition types of 2Nx2N, 2NxN, Nx2N, and NxN types in which the encoding units of encoding depth are divided into halves of height or width by asymmetrically dividing the encoding units of the encoding depth into heights or widths Or an asymmetric partition type.

Accordingly, the coding depth and coding mode determination unit 1420 according to the embodiment determines the coding depth and the encoding unit size of the coding depth including the prediction unit and the index of the current maximum coding unit of the upper left minimum coding unit of the current upper prediction unit , The partition type and the partition index to determine an index for the current maximum encoding of the minimum encoding units included in the current prediction unit.

The coding depth and coding mode decision unit 1420 according to the embodiment can determine the absolute position of the upper leftmost coding unit in the inner left upper side of the current coding unit based on the relative position of the current coding unit with respect to the current maximum coding unit have.

The coding depth and coding mode determiner 1420 according to an embodiment calculates the coding depth and coding mode according to the absolute position of the upper left minimum coding unit of the current upper left prediction unit of the current prediction unit on the basis of the relative position of the coding unit of the current prediction unit with respect to the current maximum coding unit .

The coding depth and coding mode decision unit 1420 according to the embodiment can refer to neighbor information of the current data unit for coding the video data of the current data unit. For example, in order to predictively encode the current maximum encoding unit, the current encoding unit, or the current prediction unit, neighbor information such as a neighboring maximum encoding unit, a neighboring encoding unit, and the like may be referred to.

More specifically, the neighbor information of the current maximum encoding unit includes a maximum encoding unit, a prediction unit, and a minimum encoding unit located on the outer left side of the current maximum encoding unit, a maximum encoding unit, a prediction unit, A prediction unit, and a minimum encoding unit located at the upper right corner, and a maximum encoding unit, a prediction unit, and a minimum encoding unit located at the upper left outer side.

In order to determine reference information for random directional intra prediction, the coding depth and coding mode determination unit 1420 according to an exemplary embodiment uses the indexes of the minimum coding unit included in the current prediction unit, An index for the maximum encoding unit of the minimum encoding unit to be used and an availability indicating whether or not the neighboring minimum encoding unit can be used as reference information can be determined.

For example, the coding depth and coding mode decision unit 1420 according to an embodiment determines the coding depth and coding mode of the predictive unit according to the absolute position of the current maximum coding unit, the absolute position of the current coding unit, By using the size, it can be determined whether the prediction unit including the neighboring minimum coding unit is out of the current picture. If the neighboring minimum coding unit or neighboring prediction unit is out of the current picture, neighboring minimum coding unit or neighboring prediction unit is not the current picture, but is not yet accessible in the zigzag scan order, It can be determined that it can not be used as information.

The coding depth and coding mode determination unit 1420 according to the embodiment may determine information on the upper data unit based on the lower data unit. For example, with respect to the minimum encoding unit, encoding information including at least one of information on a per-depth encoding unit, information on division into a prediction unit of the per-depth encoding unit, and information on a prediction mode of the prediction unit Information on the coding unit, the prediction unit, and the maximum coding unit of the coding depth can be deduced.

The coding depth and the information on the coding mode related to the coding depth determined by the coding mode determining unit 1420 are output to the data output unit 1430.

The data output unit 1430 according to an exemplary embodiment outputs all information on a coding mode related to the coding depth determined for each maximum coding unit and the coded video data as a coding result.

15 is a block diagram of a video decoding apparatus based on a scan order of a hierarchical data unit according to an embodiment of the present invention.

The video decoding apparatus 1500 based on the scanning order of the hierarchical data unit includes a receiving unit 1510, a data extracting unit 1520, and a decoding unit 1530. The image decoding apparatus 1500 based on the scan order of the hierarchical data unit according to an embodiment may be a specific embodiment of the image decoding apparatus 200 according to an embodiment. The receiving unit 210, the image data and encoding information extracting unit 220 and the image data decoding unit 230 of the video decoding apparatus 200 according to an embodiment may be implemented by the image decoding apparatus The data extraction unit 1520, and the decryption unit 1530 of FIG.

The receiving unit 1510 according to an embodiment receives and parses a bitstream of the encoded video.

The data extracting unit 1510 according to an embodiment receives the parsed bitstream from the receiving unit 1520 and extracts information on the encoding depth and the related encoding mode and the encoded video data for each maximum encoding unit from the bitstream .

The decoding unit 1530 according to an embodiment receives the information on the encoding mode and the encoded video data from the data extracting unit 1520 and generates the encoded video data based on the information on the encoding depth and the encoding mode And decodes the video data encoded for each coding unit of at least one coding depth.

The decoded and restored video data may be transmitted to various terminals capable of being reproduced or may be stored in a storage device.

According to one embodiment, the encoding order for the largest encoding unit follows a raster scan order. The coding units of the hierarchical depth in the maximum coding unit can be scanned in the zigzag scanning order among the depth coding units of the same depth by depth. In addition, the encoding order of the minimum encoding unit in the maximum encoding unit may follow the zigzag scan order or the raster scan order.

The decoding unit 1530 according to an exemplary embodiment may also be configured to determine an absolute position and a relative position between data units based on a scanning order between hierarchical data units, as in the coding depth and coding mode determination unit 1420 according to the embodiment. You can search for and convert locations.

For example, the decoding unit 1530 according to an embodiment can determine the absolute position or the relative position of the lower-level coding unit by using the relative position or the absolute position of the upper coding unit. In addition, the decoding unit 1530 according to an exemplary embodiment may use the index of the current upper coding unit of the upper left upper coding unit of the upper left coding unit, The index for the current maximum encoding unit of the minimum encoding unit at the top can be determined.

The decoding unit 1530 according to an embodiment uses the relative position of the predetermined minimum coding unit included in the current prediction unit with respect to the current maximum coding unit to calculate the current maximum coding unit of the minimum coding units included in the current prediction unit, Can determine the relative position of the object. For example, the decoding unit 1530 according to an embodiment uses the index of the current maximum coding unit of the upper left upper coding unit of the current prediction unit and the index of the upper right upper coding unit of the current upper right upper coding unit The index for the current maximum encoding unit or the index for the current maximum encoding unit of the minimum encoding unit in the inner left lower end of the current prediction unit can be determined. In addition, the decoding unit 1530 according to an exemplary embodiment may determine an index for the current maximum encoding unit of the minimum encoding units of the current prediction unit in accordance with the partition type and partition index of the encoding unit of the encoding depth including the prediction unit The method can be distinguished.

The decoding unit 1530 according to an embodiment can determine the absolute position of the upper leftmost encoding unit in the current upper left of the current encoding unit based on the relative position of the current encoding unit with respect to the current maximum encoding unit. In addition, the decoding unit 1530 according to an exemplary embodiment may determine the absolute position of the upper leftmost coding unit of the current upper left prediction unit based on the relative position of the coding unit of the current prediction unit with respect to the current highest coding unit have.

The decoding unit 1530 according to an embodiment uses the indexes based on the zigzag scanning order of the minimum coding unit included in the current prediction unit to determine reference information for random directional intra prediction, The index of the maximum encoding unit of the minimum encoding unit to be used, the availability of the neighboring minimum encoding unit, and the address of the neighboring maximum encoding unit.

For example, the decoding unit 1530 according to an exemplary embodiment may use the size of the prediction unit according to the absolute position of the current maximum encoding unit, the absolute position of the current encoding unit, the partition type of the current prediction unit, It can be determined whether the prediction unit including the neighboring minimum coding unit is out of the current picture.

The encoding information including at least one of the information on the encoding unit for each depth, the information on the division into the prediction unit of the encoding unit by depth, and the information on the prediction mode of the prediction unit can be extracted from the minimum encoding unit , The decoding unit 1530 according to one embodiment can extract information on the encoding unit, the prediction unit, and the maximum encoding unit of the corresponding encoding depth from the minimum encoding unit.

Accordingly, the video encoding apparatus 1400 based on the scan order of the hierarchical data units and the video decoding apparatus 1500 based on the scan order of the hierarchical data units according to an embodiment may be configured to perform the hierarchical data units By using the relative position and absolute position of the data units based on the scan order, and using the relatively large data units rather than the existing macro blocks and using various types of data units, the position of the data units can be accurately and quickly analyzed So that the video can be efficiently encoded or decoded.

16 shows an index according to a zigzag scanning order of a hierarchical coding unit according to an embodiment.

A coding depth and coding mode determiner 1420 of the video coding apparatus 1400 based on the scanning order of the hierarchical data units according to an embodiment, and a video decoding apparatus 1420 based on the coding order of the hierarchical data units according to an embodiment 1500) may scan the lower data units included in the upper data unit according to the zigzag scan order.

The maximum encoding unit LCU 1600 includes the encoding units of depth d-1 including the encoding unit CU_d-1 1610. The depths d-1 and d respectively represent the upper depth and the lower depth, respectively, and the coding unit CU_d-1 1610 at the depth d-1 and the coding units CU_d 1630, 1640, 1650 and 1660 at the depth d respectively And is a relatively higher encoding unit and a lower encoding unit.

The upper coding unit CU_d-1 1610 may include four lower coding units CU_d 1630, 1640, 1650 and 1660 as a lower coding unit. In particular, the four lower-level encoding units CU_d 1630, 1640, 1650, and 1660, in accordance with the index indicating the zigzag scan order, include CU_d 1630 as the coding unit index 0, CU_d 1640 as the coding unit index 1, The order of the unit index 2 CU_d 1650 and the coding unit index 3 CU_d 1660 can be scanned.

The coding depth and coding mode determining unit 1420 and the decoding unit 1530 according to an embodiment may determine the minimum coding unit SCU_d-1 (1610) located at the upper left of the upper coding unit CU_d-1 1610 1640, 1650, and 1660) relative to the maximum encoding unit by using the relative positions of the minimum encoding units SCU_d (1630, 1640, 1650, and 1660) located in the inner upper left of the lower encoding units CU_d (1630, 1640, 1650, and 1660).

For example, the minimum coding unit index scuIdx_d-1 is set according to the zigzag scanning method for the maximum coding unit with respect to the minimum coding unit SCU_d-1 1620 located at the upper left inside of the upper coding unit CU_d-1 1610 do. In this case, the index scuIdx_d for the maximum coding unit of the minimum coding unit SCU_d 1670 located at the inner left upper end of the lower coding unit CU_d 1640 of the upper coding unit CU_d-1 1610 is the upper coding unit CU_d-1 1 from the inner left upper left smallest coding unit SCU_d-1 1620 of the upper left smallest coding unit SCU_d-1.

For convenience of explanation, it is assumed that the lower coding unit CU_d 1640 of the upper coding unit CU_d-1 1610 of size 2Nx2N is divided only into coding units of size NxN. An example of a method of deriving the index scuIdx_d of the minimum coding unit SCU_d (1670) located at the inner left upper end of the sub-coding unit CU_d (1640) is as follows.

(1)

scuIdx_d = scuIdx_d-1 + cuIdx_d * NumScusInLcu / (4 ^ d)

NumScusInLcu represents the total number of the minimum coding units SCU included in the maximum coding unit LCU 1600. [ Accordingly, the coding depth and coding mode determining unit 1420 and the decoding unit 1530 according to an embodiment are able to determine the minimum coding size of the inner left upper coding unit of the upper left coding unit CU_d-1 of the lower coding unit CU_d and the index cuIdx_d of the lower coding unit CU_d The index scuIdx_d of the minimum coding unit SCU_d located at the inner left upper end of the lower coding unit CU_d can be determined using the index scuIdx_d-1 of the unit scu_d.

For convenience of explanation, Equation (1) assumes that the upper coding unit CU_d-1 of size 2Nx2N is divided only into the lower coding units CU_d of the size NxN, and the maximum coding unit according to the zigzag scanning The encoding depth and encoding mode determination unit 1420 and the decoding unit 1530 according to an exemplary embodiment are not limited thereto.

The coding depth and coding mode determining unit 1420 and the decoding unit 1530 according to an embodiment are configured to determine the relative positions of the lower coding unit CU_d with respect to the largest coding unit LCU and the inner positions of the upper coding unit CU_d- The relative position of the minimum coding unit SCU_d located at the inner left upper end of the lower coding unit CU_d with respect to the maximum coding unit LCU can be determined using the relative position with respect to the maximum coding unit LCU of the leftmost coding unit SCU_d-1.

FIG. 17 shows the relative positions of a maximum encoding unit, a hierarchical data unit, and a minimum encoding unit according to an embodiment.

There are maximum coding units 1710, 1720 and 1730 of depth 0 and a minimum coding unit size 1740 is set to a depth of 3. Based on the hierarchical structure of the maximum encoding unit, the prediction unit, and the minimum encoding unit, the relative positions of the prediction units with respect to the maximum encoding unit follow the zigzag scanning order, and the relative positions of the minimum encoding units with respect to the prediction unit are also referred to as the zig- Follow. Also, the relative position of the minimum encoding unit for the maximum encoding unit is also in accordance with the zigzag scan order.

Accordingly, the relative positions of the minimum coding units of the current prediction unit 1710 of the current maximum coding unit 1710 with respect to the maximum coding unit 1710 are the same as those of the current coding unit 1710 in the zigzag scanning order within the current maximum coding unit 1710 Can be displayed.

The coding depth and coding mode determining unit 1420 and the decoding unit 1530 according to an exemplary embodiment may determine a relative position with respect to the maximum coding unit of the minimum coding units at a predetermined position of the current prediction unit 1750 , And a position relative to the maximum encoding unit of the inner left upper encoding unit 1752 can be used.

For example, the coding depth and coding mode determining unit 1420 and the decoding unit 1530 according to an embodiment may determine the minimum coding unit 1754 of the upper right inner coding unit 1754 of the current prediction unit 1750 The index for the maximum encoding unit and the index for the maximum encoding unit of the inner left lower encoding unit 1756 can be determined using the index for the maximum encoding unit of the inner left upper encoding unit 1752. [

In detail, the coding depth and coding mode determining unit 1420 and the decoding unit 1530 according to an exemplary embodiment of the present invention may determine an index for the maximum coding unit of the upper left smallest coding unit 1752, An index for the maximum coding unit of the upper rightmost coding unit 1754 in the upper right side of the current prediction unit 1750 and an index for the upper left corner of the lower left side coding unit 1754 using the index of the current coding unit, The index of the minimum encoding unit of the minimum encoding unit 1756 of FIG. The partition type of the current encoding unit indicates the division type and division type of the current encoding unit into the current prediction unit and the index of the current partition type indicates the index of the current prediction unit with respect to the current encoding unit.

According to the hierarchical structure of the encoding unit and the data unit in the video encoding and decoding method according to the embodiment, the type of the encoding unit, that is, the type of the prediction unit may include a symmetric partition type and an asymmetric partition type have. Examples of the symmetric partition type of the coding unit of size 2Nx2N are 2Nx2N type, 2NxN type, Nx2N type and NxN type, and examples of the asymmetric partition type include 2NxnU in which the height of the coding unit of size 2Nx2N is divided by 1 to 3 2NxnD type in which the height of the encoding unit of type 2Nx2N is divided by 3 to 1, the width of the encoding unit of nLx2N type and size 2Nx2N in which the width of the encoding unit of size 2Nx2N is divided by 1 to 3, There may be nRx2N type.

The index of the minimum encoding unit of the current prediction unit can be determined using the height or the width of the current prediction unit and the number of prediction units as variables. However, since the height or width of the current prediction unit is changed according to the partition type and the number of prediction units is changed, the coding depth and coding mode deciding unit 1420 and the decoding unit 1530 according to the embodiment, The index determination method of the minimum encoding unit of the current prediction unit can be set differently according to the partition type of the current prediction unit.

Therefore, by using the index scuIdxAL for the maximum coding unit of the upper left minimum coding unit 1752 of the current upper left prediction unit 1750, the maximum value of the minimum coding unit 1754 in the upper right upper right side of the current prediction unit 1750 The method for determining the index scuIdxBL for the maximum encoding unit of the index scuIdxAR for the encoding unit and the minimum encoding unit 1756 for the inner left lower end is the method of determining whether the partition type of the current prediction unit 1750 is 2Nx2N type, 2NxN type, NxN type, 2NxnU type, 2NxnD type, nLx2N type, and nRx2N type. The index derivation method of the minimum encoding unit for each partition type of the predictive unit will be described later with reference to Figure 19. It is also assumed that the neighbor information of the current prediction unit 1750 of the current maximum encoding unit 1710 is the index of the current prediction unit 1750 (1760), B (1762), C (1764), D (1766), and E (1768) neighboring the minimum coding unit are displayed.

For example, the left neighbor information, the upper neighbor information, the upper right neighbor information, the upper left neighbor information, and the lower left neighbor information of the current prediction unit 1750 are respectively allocated to the minimum coding A minimum coding unit A 1760 located on the outer left side of the unit 1752, a minimum coding unit B 1762 located on the outer upper side, a minimum coding unit C 1764 located on the outer right upper side, And the minimum encoding unit E (1768) located at the outer left lower end.

The coding depth and coding mode determination unit 1420 and the decoding unit 1530 according to an exemplary embodiment may determine the position and availability of the minimum coding unit neighboring the current prediction unit and the position of the maximum coding unit You can search. The position of the neighboring minimum coding unit or the position of the maximum coding unit may be represented by the index of the minimum coding unit neighboring the current prediction unit and the address of the neighboring maximum coding unit including the neighboring minimum coding unit.

(i) when the neighboring maximum coding unit is included in the current picture, (ii) when the neighboring maximum coding unit is not included in the current slice, (iii) when the address of the neighboring maximum coding unit is And (iv) a case in which the index according to the zigzag scanning order of the minimum coding unit in the inner left upper end of the neighboring depth coding unit is one of the subordinate to the index according to the zigzag scanning order of the current minimum coding unit Otherwise, data of neighboring depth-specific encoding units can be retrieved that are available.

In order to retrieve neighbor information neighboring the current prediction unit, an index of the minimum encoding unit located at the inner left upper end of the current prediction unit, an index of the minimum encoding unit located at the inner right upper end, or an index of the minimum encoding unit May be considered, and information on partition type information and current depth is needed. Also, if the sizes of all the prediction units are not the same, an index of the prediction unit for the current encoding unit is needed.

18 shows neighboring prediction units for random directional intra prediction according to an embodiment.

Referring to FIG. 17 and FIG. 18, a method of determining availability of neighbor information according to an embodiment is described. The current prediction unit CurrPU 1820 of the coding unit 1810 of the coding depth of the current maximum coding unit 1800 can refer to neighbor information for predictive coding. The coding depth and coding mode determination unit 1420 and the decoding unit 1530 according to an exemplary embodiment may search for the indexes and availability of prediction units neighboring the current prediction unit 1820.

Specifically, the coding depth and coding mode determining unit 1420 and the decoding unit 1530 according to an embodiment calculate the indexes scuIdx and scuIdx of the upper leftmost coding unit in the upper left of the current prediction unit 1820, The index scuIdxAR of the minimum right encoding unit in the inner right upper end, the index scuIdxBL of the minimum left encoding unit in the inner left bottom, the partition type of the current prediction unit 1820, the depth of the current encoding unit, To determine the location and availability of the neighbor information of the current prediction unit.

The neighbor information of the current prediction unit 1820 may include the left neighbor information A, the upper right neighbor information B, the upper right neighbor information C, the upper left neighbor information D, and the lower left neighbor information E of the current prediction unit 1820 . In addition, the location and availability of each neighbor information may include the index and availability of the minimum encoding unit neighboring the current prediction unit 1820, and the address of the corresponding maximum encoding unit of the neighboring minimum encoding unit.

In particular, the coding depth and coding mode determination unit 1420 and the decoding unit 1530 according to an embodiment may determine that the outer right upper neighbor information C of the current prediction unit 1820 and the outer left lower In determining availability for neighbor information E, it must first be determined whether the neighbor information is accessible data.

The coding depth and coding mode determining unit 1420 and the decoding unit 1530 according to an embodiment may determine the coding depth and coding mode according to an embodiment of the present invention, It is possible to determine the availability of a prediction unit 1850 positioned at the upper right.

The prediction unit 1850 located at the upper right upper end of the current prediction unit 1820 is calculated using the x-coordinate value of the current maximum encoding unit, the x-coordinate value of the current encoding unit, and the width of the current prediction unit according to the partition type If it is out of the picture, it is determined as neighbor information that can not be used as reference information. At this time, the x coordinate value of the current coding unit can be derived from the index scuIdxAR of the upper right inner coding unit of the current prediction unit 1820. The x coordinate value of the current maximum coding unit may be derived from information on the current maximum coding unit according to the index scuIdx of the upper leftmost coding unit of the inner left upper side of the current prediction unit 1820. [

In a similar manner, the coding depth and coding mode determining unit 1420 and the decoding unit 1530 according to an exemplary embodiment of the present invention determine whether the current predicted unit 1820 out of the outer left lower neighbor information E of the current prediction unit 1820 The prediction unit 1840 located at the outer left lower end of the prediction unit 1840 can be determined. The prediction unit 1840 located at the lower left outside of the current prediction unit 1820 is used as the current prediction unit 1840 using the y coordinate value of the current maximum coding unit, the y coordinate value of the current coding unit, If it does not leave the picture, it is determined as neighbor information available as reference information.

At this time, the y coordinate value of the current coding unit can be derived from the index scuIdxBL of the upper right inner coding unit of the current prediction unit 1820. The y coordinate value of the current maximum coding unit may be derived from the information on the current maximum coding unit according to the index scuIdx of the upper leftmost coding unit in the inner left upper side of the current prediction unit 1820. [

The coding depth and coding mode determining unit 1420 and the decoding unit 1530 according to an embodiment of the present invention may be configured such that the prediction depth of the prediction unit 1840 If it is determined that the maximum coding unit 1830 is the maximum coding unit that can not be accessed yet according to the zigzag scanning order, The unit 1840 may be determined as neighbor information that can not be used as reference information.

The coding depth and coding mode decision unit 1420 and the decoding unit 1530 according to an embodiment determine the index and the availability for a neighboring minimum coding unit and perform coding of neighboring minimum coding units The index of the neighboring prediction unit and the availability or the address of the neighboring maximum encoding unit may be retrieved from the information on the mode.

Referring to FIGS. 19 through 26, a coding depth and coding mode determination unit 1420 and a decoding unit 1530 according to an exemplary embodiment may calculate a coding depth and coding mode according to partition types, A method of deriving an index of the encoding units within the maximum encoding unit will be described. For convenience of explanation, although the case where the maximum encoding unit of size 2Nx2N includes 16 minimum encoding units and the current depth encoding unit is the maximum encoding unit is described as an example, the maximum encoding unit, encoding unit And the structure of the minimum encoding unit are not limited thereto.

FIG. 19 shows a location of a minimum encoding unit in a prediction unit of a size 2Nx2N and a partition type 2Nx2N according to an embodiment.

The maximum encoding unit 1900 of size 2Nx2N is composed of 16 minimum encoding units 1905, 1910, 1915, 1920, 1925, 1930, 1935, 1940, 1945, 1950, 1955, 1960, 1965, 1970, 1975, .

In order to derive indices for the maximum coding unit 1900 of the minimum coding unit 1920 at the upper right and the minimum coding unit 1965 at the lower left of the prediction unit 1990, The index for the maximum coding unit 1900 of the coding unit 1905, the coding unit size, the partition type of the prediction unit 1990, and the partition index of the prediction unit 1990 may be required.

Hereinafter, a relational expression for deriving an index for the maximum coding unit 1900 of the upper left, upper right, and lower left minimum coding units 1905, 1920, and 1965 among the prediction units 1990 of the partition type 2Nx2N is illustrated . The absolute index ScuIdxUL of the leftmost coding unit 1905, the size of the minimum coding unit ScuSize, and the number of the minimum coding units LcuWidthInScus in the width direction of the maximum coding unit among the maximum coding units 1900 may be fixed variables.

19 to 26, it is necessary to understand the difference between the absolute index according to the raster scan order of the minimum encoding unit and the relative index according to the zigzag scan order according to an exemplary embodiment. The absolute index of the minimum encoding unit according to an embodiment indicates an index according to the raster scan order between the minimum encoding units of the maximum encoding unit. In addition, the relative index of the minimum coding unit according to an exemplary embodiment indicates an index according to a zigzag scanning order between the minimum coding units of the maximum coding unit.

The zigzag scan order between the minimum encoding units according to an exemplary embodiment indicates a sequence of scanning the neighboring four minimum encoding units in the order of the upper left corner, the upper right corner, the lower left corner, and the lower right corner. Between the sets of four neighboring minimum encoding units are scanned in raster scan order. For example, if the eight minimum encoding units 1905, 1910, 1915, 1920, 1925, 1930, 1935, and 1940 arranged in the raster scan order are scanned according to the zigzag scan sequence, then 1905, 1910, 1925, , 1920, 1935, and 1940, respectively. Accordingly, if the absolute index and the relative index of the minimum coding unit 1905 are 0, the absolute index of the minimum coding unit 1925 can be set to 4 and the relative index to 2.

19 to 26, the bit operator 'a " b' represents a bit shift and represents an operation of shifting the bit string a by b bits to the right. Describing the bitwise operator 'a >> b' in decimal is the same as dividing the decimal value a by 2. For example, the bit operations NumScusInLcu >> 1, NumScusInLcu >> 2, NumScusInLcu >> 3 and NumScusInLcu >> 4 using the number of minimum encoding units NumScusInLcu in the maximum encoding unit are 8 (= 16/2 ^ 1), 4 (= 16/2 ^ 2), 2 (= 16/2 ^ 3) and 1 (= 16/2 ^ 4). The bit operation 'NumScusInLcu >> 1' may represent an operation of transforming (increasing or decreasing) the relative index from the current minimum coding unit to the minimum coding unit preceding or following 8 steps according to the zigzag scanning order. In a similar manner, the bit operation 'NumScusInLcu >> 2' is performed in the fourth step, the bit operation 'NumScusInLcu >> 3' is performed in the second stage and the bit operation 'NumScusInLcu >> 4' is performed in the zigzag skin order from the current minimum encoding unit (Increment or decrement) the relative index as a preceding or following minimum encoding unit.

In the case of the prediction unit 1990 of the partition type 2Nx2N, the relative index scuIdxALtemp of the leftmost coding unit 1905 with respect to the maximum coding unit 1900 is given by the following relational expression (1).

scuIdxALtemp = ConvertAbsToRel (ScuIdxAL); -(One)

The absolute index ScuIdxAL represents an index for the maximum encoding unit of the leftmost encoding unit 1905 at the upper left corner. The function ConvertAbsToRel () converts the absolute index of the largest encoding unit to a relative index.

In the case of the prediction unit 1990 of the partition type 2Nx2N, the index ScuIdxAR of the rightmost coding unit 1905 of the prediction unit 1990 with respect to the maximum coding unit 1900 can be determined according to the following relation (2) have.

scuIdxARtemp = ConvertAbsToRel (ScuIdxUL + CuSize / ScuSize - 1); -(2)

According to the relational expression (2), the temporary variable scuIdxARtemp represents the relative index of the upper right minimum encoding unit 1920 of the prediction unit 1990 of the partition type 2Nx2N.

The index ScuIdxBL of the minimum coding unit 1965 at the lower left of the prediction unit 1990 for the maximum coding unit 1900 can be determined according to the following relational expressions (3) and (4).

scuIdxBLtemp = ConvertAbsToRel (ScuIdxUL + ((CuSize / ScuSize) >> 1 1) * LcuWidthInScus); - (3)

According to relational expression (3), the temporary variable scuIdxBLtemp represents the relative index of the minimum coding unit (1925) of the current prediction unit (1990).

scuIdxBLtemp + = NumScusInLcu >> 1; -(4)

According to relational expressions (3) and (4), the temporary variable scuIdxBLtemp represents the relative index of the minimum encoding unit 1965 of the current prediction unit 1990.

Therefore, using the index ScuIdxAL for the maximum coding unit in the upper leftmost coding unit of the current prediction unit, the size CuSize of the current coding unit, the partition type and the partition index of the current prediction unit, The relative index scuIdxALtemp of the minimum coding unit 1905 of the upper left, the relative index scuIdxARtemp of the upper right minimum coding unit 1920 and the relative index scuIdxBLtemp of the lower left minimum coding unit 1965 can be determined.

Based on the relative indices of the minimum encoding unit 1905, the minimum encoding unit 1920 and the minimum encoding unit 1925 according to the above-described relational expressions (1) to (3) Examples of the relational expressions for deriving the indexes of the upper left, upper right, and lower left encoding units of the prediction unit for each partition type (2NxN, Nx2N, NxN, 2NxnU, 2NxnD, nLx2N, nRx2N)

20 shows the location of the minimum encoding unit in the prediction unit of the size 2Nx2N and the partition type 2NxN according to an embodiment.

(i) For the prediction unit 2000 of the partition type 2NxN and the partition index 0, the leftmost coding unit AL0 (1905), the rightmost coding unit AR0 (1920), and the left lower coding unit BL0 (1), (2) and (3) can be used as they are, respectively, for the indices for the maximum encoding unit.

scuIdxALtemp = ConvertAbsToRel (ScuIdxAL); -(One)

scuIdxARtemp = ConvertAbsToRel (ScuIdxUL + CuSize / ScuSize - 1); -(2)

scuIdxBLtemp = ConvertAbsToRel (ScuIdxUL + ((CuSize / ScuSize) >> 1 1) * LcuWidthInScus); - (3)

(ii) the leftmost coding unit AL1 1945, the rightmost coding unit AR1 1960 and the leftmost coding unit BL1 1965 in the case of the prediction unit 2010 of the partition type 2NxN and the partition index, The relational expressions (5) and (6) may be additionally set in addition to the relational expressions (1), (2), (3) and (4).

scuIdxALtemp = ConvertAbsToRel (ScuIdxAL); -(One)

scuIdxALtemp + = NumScusInLcu >> 1; - (5)

scuIdxARtemp = ConvertAbsToRel (ScuIdxUL + CuSize / ScuSize - 1); -(2)

scuIdxARtemp + = NumScusInLcu >> 1; - (6)

scuIdxBLtemp = ConvertAbsToRel (ScuIdxUL + ((CuSize / ScuSize) >> 1 1) * LcuWidthInScus); - (3)

scuIdxBLtemp + = NumScusInLcu >> 1; -(4)

According to the relational expressions (5), (6) and (4), the temporary variables scuIdxALtemp, scuIdxARtemp, and scuIdxBLtemp are the leftmost coding units AL1 (1945), The relative index of the minimum coding unit AR1 (1960) on the upper right side and the minimum coding unit BL1 (1965) on the lower left side.

FIG. 21 shows a location of a minimum encoding unit in a prediction unit of a size 2Nx2N and a partition type Nx2N according to an embodiment.

(i) For the prediction unit 2100 of the partition type Nx2N and the partition index 0, for the indexes for the maximum coding unit of the leftmost coding unit AL0 (1905) and the leftmost coding unit minimum coding unit BL0 (1965) , And relational expressions (1), (3) and (4) can be used as they are.

scuIdxALtemp = ConvertAbsToRel (ScuIdxAL); -(One)

scuIdxBLtemp = ConvertAbsToRel (ScuIdxUL + ((CuSize / ScuSize) >> 1 1) * LcuWidthInScus); - (3)

scuIdxBLtemp + = NumScusInLcu >> 1; -(4)

Relation (7) can also be set based on the relational expression (2) for the index of the maximum encoding unit of the rightmost uppermost encoding unit AR0 (1910) of the prediction unit 2100 of the partition index 0.

scuIdxARtemp = ConvertAbsToRel (ScuIdxUL + CuSize / ScuSize - 1); -(2)

scuIdxARtemp - = NumScusInLcu >> 2; - (7)

According to the relational expressions (1), (4) and (7), the temporary variables scuIdxALtemp, scuIdxBLtemp and scuIdxARtemp are the leftmost coding unit AL0 (1905) of the prediction unit 2100 of the partition type Nx2N and the partition index 0, The relative index of the left-most coding unit BL0 (1965) and the right-most minimum coding unit AR0 (1910).

(ii) For the partition type Nx2N and the prediction unit 2110 of the partition index 1, the relation (8) can be set based on the relation (1) for the index of the leftmost coding unit AL1 (1915) .

scuIdxALtemp = ConvertAbsToRel (ScuIdxAL); -(One)

scuIdxALtemp + = NumScusInLcu >> 2; -(8)

Relational expression (9) is set based on the relational expression (3) for the index for the maximum encoding unit of the leftmost encoding unit BL1 (1975) in the lower left of the prediction unit 2110 of the partition type Nx2N and the partition index 1 .

scuIdxBLtemp = ConvertAbsToRel (ScuIdxUL + ((CuSize / ScuSize) >> 1 1) * LcuWidthInScus); - (3)

scuIdxBLtemp + = NumScusInLcu >> 2 * 3; - (9)

Further, the relational expression (2) can be used as it is for the index for the maximum encoding unit of the rightmost uppermost encoding unit AR1 (1920) of the prediction unit 2110 of the partition type Nx2N and the partition index 1.

scuIdxARtemp = ConvertAbsToRel (ScuIdxUL + CuSize / ScuSize - 1); -(2)

According to the relational expressions (8), (2) and (9), the temporary variables scuIdxALtemp, scuIdxARtemp and scuIdxBLtemp are the leftmost coding unit AL1 (1915) of the prediction unit 2110 of the partition type Nx2N and the partition index 1, Represents the relative index of the minimum coding unit AR1 (1920) at the upper right and the minimum coding unit BL1 (1975) at the lower left.

22 shows a location of a minimum encoding unit in a prediction unit of a size 2Nx2N and a partition type NxN according to an embodiment.

The minimum coding units at the upper left of the prediction units 2200, 2210, 2220 and 2230 of the partition type NxN of the current coding unit 1900 are AL0 (1905) for the partition index 0 and AL1 (1915 , AL2 (1945) for partition index 2, and AL3 (1955) for partition index 3. The minimum coding units in the upper right corner are AR0 (1910) for partition index 0, AR1 (1920) for partition index 1, AR2 (1950) for partition index 2, and AR3 (1960) for partition index 3. The minimum coding units in the lower left are BL0 (1925) for partition index 0, BL1 (1935) for partition index 1, BL2 (1965) for partition index 2, and BL3 (1975) for partition index 3.

For example, the relational expression (10) is calculated on the basis of the relational expression (2) for the index for the maximum encoding unit of the upper rightmost encoding unit AR0 (1910) of the prediction unit 2200 of the partition type NxN and the partition index 0, Can be set.

scuIdxARtemp = ConvertAbsToRel (ScuIdxUL + CuSize / ScuSize - 1); -(2)

scuIdxARtemp - = NumScusInLcu >> 2; - (10)

For example, the relational expression (11) is calculated on the basis of the relational expression (1) for the index for the maximum encoding unit of the leftmost encoding unit AL1 (1915) in the upper left of the prediction unit 2210 of the partition type NxN and the partition index 1 Can be set.

scuIdxALtemp = ConvertAbsToRel (ScuIdxAL); -(One)

scuIdxALtemp + = NumScusInLcu >> 2; - (11)

For example, the minimum coding units BL0 (1925), BL1 (1935), BL2 (1965), and BL3 (1975) at the lower left of the prediction units 2200, 2210, 2220 and 2230 of the partition type NxN and the partition type NxN (3) and (12) may be set according to the partition index (CuPartIdx), for the indexes for the maximum coding unit of the partition index (CuPartIdx).

scuIdxBLtemp = ConvertAbsToRel (ScuIdxUL + ((CuSize / ScuSize) >> 1 1) * LcuWidthInScus); - (3)

scuIdxBLtemp + = NumScusInLcu >> 2 * CuPartIdx; - (12)

In a manner similar to relational expressions (10), (11) and (12), temporary variables include partition type NxN and the leftmost encoding units AR0 1905, AL1 1915, AL2 1945, The relative index scuIdxALtemp of AL3 1955, the relative index scuIdxARtemp of the rightmost upper coding units AR0 1910, AR1 1920, AR2 1950 and AR3 1960 and the lower coding units BL0 1925), the relative index scuIdxBLtemp of BL1 1935, BL2 1965, and BL3 1975 may be set.

23 shows the location of the minimum encoding unit in the prediction unit of the size 2Nx2N and the partition type 2NxnU according to an embodiment.

(i) For the prediction unit 2300 of the partition type 2NxnU and the partition index 0, for the indexes for the maximum coding unit of the leftmost coding unit AL0 (1905) and the rightmost coding unit AR0 (1920) The relational expressions (1) and (2) can be used as they are.

scuIdxALtemp = ConvertAbsToRel (ScuIdxAL); -(One)

scuIdxARtemp = ConvertAbsToRel (ScuIdxUL + CuSize / ScuSize - 1); -(2)

(13) is set based on the relational expression (3) for the index for the maximum encoding unit of the minimum encoding unit BL0 (1905) at the lower left of the prediction unit 2300 of the partition type 2NxnU and the partition index 0 .

scuIdxBLtemp = ConvertAbsToRel (ScuIdxUL + ((CuSize / ScuSize) >> 1 1) * LcuWidthInScus); - (3)

scuIdxBLtemp - = NumScusInLcu >> 3; - (13)

According to the relational expressions (1), (2) and (13), the temporary variables scuIdxALtemp, scuIdxBLtemp and scuIdxARtemp are the leftmost encoding unit AL0 (1905) of the prediction unit 2300 of the partition type 2NxnU and the partition index 0, Represents the relative index of the leftmost coding unit BL0 (1905) and the rightmost coding unit AR0 (1920).

(ii) For the prediction unit 2310 of the partition type 2NxnU and the partition index 1, for the indices of the leftmost coding unit AL1 1925 and the rightmost coding unit 1940, 2), the relational expressions (14) and (15) can be set.

scuIdxALtemp = ConvertAbsToRel (ScuIdxAL); -(One)

scuIdxALtemp + = NumScusInLcu >> 3; - (14)

scuIdxARtemp = ConvertAbsToRel (ScuIdxUL + CuSize / ScuSize - 1); -(2)

scuIdxARtemp + = NumScusInLcu >> 3; - (15)

Relational expressions (3) and (4) can be used for the index for the maximum encoding unit of the minimum encoding unit BL1 (1965) at the lower left of the prediction unit 2310 of the partition type 2NxnU and the partition index 1.

scuIdxBLtemp = ConvertAbsToRel (ScuIdxUL + ((CuSize / ScuSize) >> 1 1) * LcuWidthInScus); - (3)

scuIdxBLtemp + = NumScusInLcu >> 1; -(4)

According to the relational expressions (14), (15) and (4), the temporary variables scuIdxALtemp, scuIdxARtemp, and scuIdxBLtemp are the leftmost coding unit AL1 1925 of the prediction unit 2310 of the partition type 2NxnU and the partition index 1, Represents the relative index of the minimum coding unit AR1 (1940) at the upper right and the minimum coding unit BL1 (1965) at the lower left.

24 shows the location of the minimum encoding unit in the prediction unit of the size 2Nx2N and the partition type 2NxnD according to an embodiment.

(i) For the prediction unit 2400 of the partition type 2NxnD and the partition index 0, for the indexes for the maximum coding unit of the leftmost coding unit AL0 (1905) and the rightmost coding unit AR0 (1920) Relations (1) and (2) can be used respectively.

scuIdxALtemp = ConvertAbsToRel (ScuIdxAL); -(One)

scuIdxARtemp = ConvertAbsToRel (ScuIdxUL + CuSize / ScuSize - 1); -(2)

The relational expression (16) is set based on the relational expression (3) for the index for the maximum encoding unit of the minimum encoding unit BL0 (1945) at the lower left of the prediction unit (2400) of the partition type 2NxnD and the partition index 0 .

scuIdxBLtemp = ConvertAbsToRel (ScuIdxUL + ((CuSize / ScuSize) >> 1 1) * LcuWidthInScus); - (3)

scuIdxBLtemp + = NumScusInLcu >> 2 + NumScusInLcu >> 3; - (16)

According to the relational expressions (1), (2) and (16), the temporary variables scuIdxALtemp, scuIdxBLtemp and scuIdxARtemp are the leftmost coding unit AL0 (1905) of the prediction unit 2300 of the partition type 2NxnD and the partition index 0, Represents the relative index of the leftmost coding unit BL0 (1945) and the rightmost coding unit AR0 (1920).

(ii) For the prediction unit 2410 of the partition type 2NxnD and the partition index 1, the relational expressions (1) and (2) for the leftmost encoding unit AL1 1965 and the rightmost encoding unit 1980 index 2), the relational expressions (17) and (18) can be set.

scuIdxALtemp = ConvertAbsToRel (ScuIdxAL); -(One)

scuIdxALtemp + = NumScusInLcu >> 1 + NumScusInLcu >> 3; - (17)

scuIdxARtemp = ConvertAbsToRel (ScuIdxUL + CuSize / ScuSize - 1); -(2)

scuIdxARtemp + = NumScusInLcu >> 1 + NumScusInLcu >> 3; - (18)

Relational expressions (3) and (4) can be used for the index for the maximum encoding unit of the minimum encoding unit BL1 (1965) at the lower left of the prediction unit 2410 of the partition type 2NxnD and the partition index 1.

scuIdxBLtemp = ConvertAbsToRel (ScuIdxUL + ((CuSize / ScuSize) >> 1 1) * LcuWidthInScus); - (3)

scuIdxBLtemp + = NumScusInLcu >> 1; -(4)

According to the relational expressions (17), (18) and (4), the temporary variables scuIdxALtemp, scuIdxARtemp and scuIdxBLtemp are the leftmost coding unit AL1 (1965) of the prediction unit 2410 of the partition type 2NxnD and the partition index 1, Represents the relative index of the rightmost coding unit AR1 (1980) and the leftmost coding unit BL1 (1965).

25 shows a location of a minimum encoding unit in a prediction unit of size 2Nx2N and a partition type nLx2N according to an embodiment.

(i) For the prediction unit (2500) of the partition type nLx2N and the partition index 0, for indexes for the maximum coding unit of the leftmost coding unit AL0 (1905) and the leftmost coding unit minimum coding unit BL0 (1965) The relational expressions (1), (3) and (4) can be used as they are.

scuIdxALtemp = ConvertAbsToRel (ScuIdxAL); -(One)

scuIdxBLtemp = ConvertAbsToRel (ScuIdxUL + ((CuSize / ScuSize) >> 1 1) * LcuWidthInScus); - (3)

scuIdxBLtemp + = NumScusInLcu >> 1; -(4)

The relational expression (19) is set based on the relational expression (2) for the index for the maximum encoding unit of the rightmost encoding unit AR0 (1905) at the upper right of the prediction unit (2500) of the partition type nLx2N and the partition index 0 .

scuIdxARtemp = ConvertAbsToRel (ScuIdxUL + CuSize / ScuSize - 1); -(2)

scuIdxARtemp - = NumScusInLcu >> 2 + NumScusInLcu >> 4; - (19)

According to the relational expressions (1), (4) and (19), the temporal variables scuIdxALtemp, scuIdxBLtemp and scuIdxARtemp are the leftmost coding unit AL0 (1905) of the prediction unit 2500 of the partition type nLx2N and the partition index 0, Represents the relative index of the leftmost coding unit BL0 (1965) and the rightmost coding unit AR0 (1905).

(ii) For the prediction unit 2510 of the partition type nLx2N and the partition index 1, for the indices of the leftmost coding unit AL1 1910 and the leftmost coding unit BL1 1970, (20) and (21) can be set based on the equation (3).

scuIdxALtemp = ConvertAbsToRel (ScuIdxAL); -(One)

scuIdxALtemp + = NumScusInLcu >> 4; - (20)

scuIdxBLtemp = ConvertAbsToRel (ScuIdxUL + ((CuSize / ScuSize) >> 1 1) * LcuWidthInScus); - (3)

scuIdxBLtemp + = NumScusInLcu >> 1 + NumScusInLcu >> 4; - (21)

Relation (2) can be used for the index for the maximum coding unit of the rightmost coding unit AR1 1920 among the prediction units 2510 of the partition type nLx2N and the partition index 1.

scuIdxARtemp = ConvertAbsToRel (ScuIdxUL + CuSize / ScuSize - 1); -(2)

According to the relational expressions (20), (21) and (2), the temporal variables scuIdxALtemp, scuIdxBLtemp and scuIdxARtemp are the leftmost coding unit AL1 (1910) of the prediction unit 2510 of the partition type nLx2N, Represents the relative index of the leftmost coding unit BL1 (1970) and the rightmost coding unit AR1 (1920).

26 shows the location of a minimum encoding unit in a prediction unit of size 2Nx2N and a partition type nRx2N in accordance with an embodiment.

(i) For the prediction unit 2600 of the partition type nRx2N and the partition type nRx2N with the partition index 0, the maximum coding unit of the leftmost coding unit AL0 (1905) and the leftmost coding unit BL0 (1965) For the indices, the relational expressions (1), (3) and (4) can be used as they are.

scuIdxALtemp = ConvertAbsToRel (ScuIdxAL); -(One)

scuIdxBLtemp = ConvertAbsToRel (ScuIdxUL + ((CuSize / ScuSize) >> 1 1) * LcuWidthInScus); - (3)

scuIdxBLtemp + = NumScusInLcu >> 1; -(4)

(22) is set based on the relational expression (2) for the index for the maximum encoding unit of the rightmost uppermost encoding unit AR0 (1915) among the prediction units 2600 of the partition type nRx2N and the partition index 0 .

scuIdxARtemp = ConvertAbsToRel (ScuIdxUL + CuSize / ScuSize - 1); -(2)

scuIdxARtemp - = NumScusInLcu >> 4; - (22)

According to the relational expressions (1), (4) and (22), the temporal variables scuIdxALtemp, scuIdxBLtemp and scuIdxARtemp are the leftmost coding unit AL0 (1905) of the prediction unit 2600 of the partition type nRx2N and the partition index 0, Represents the relative index of the leftmost coding unit BL0 (1965) and the rightmost coding unit AR0 (1915).

(ii) For the prediction unit 2610 of the partition type nRx2N and the partition index 1, for the index of the leftmost coding unit AL1 1920 and the leftmost coding unit BL1 1980, (23) and (24) can be set based on the equation (3).

scuIdxALtemp = ConvertAbsToRel (ScuIdxAL); -(One)

scuIdxALtemp + = NumScusInLcu >> 2 + NumScusInLcu >> 4; - (23)

scuIdxBLtemp = ConvertAbsToRel (ScuIdxUL + ((CuSize / ScuSize) >> 1 1) * LcuWidthInScus); - (4)

scuIdxBLtemp + = NumScusInLcu >> 1 + NumScusInLcu >> 2 + NumScusInLcu >> 4; - (24)

Relation (2) can be used for the index for the maximum coding unit of the rightmost coding unit AR1 1920 among the prediction units 2610 of the partition type nRx2N and the partition index 1.

scuIdxARtemp = ConvertAbsToRel (ScuIdxUL + CuSize / ScuSize - 1); -(2)

According to the relational expressions (23), (24) and (2), the temporal variables scuIdxALtemp, scuIdxBLtemp and scuIdxARtemp are the leftmost coding unit AL1 1920 of the prediction unit 2610 of the partition type nRx2N and the partition index 1, Represents the relative index of the leftmost coding unit BL1 (1980) and the rightmost coding unit AR1 (1920).

19 to 26, the relative indices scuIdxALtemp, scuIdxARtemp, and scuIdxBLtemp of the upper left minimum coding unit, the upper right minimum coding unit, and the lower left minimum coding unit of the current prediction unit are expressed by the relational expressions (25) to Can be switched to the absolute indices ScuIdxAL, ScuIdxAR and ScuIdxBL in accordance with equation (27).

ScuIdxAL = ConvertRelToAbs (scuIdxALtemp); - (25)

ScuIdxAR = ConvertRelToAbs (scuIdxARtemp); - (26)

ScuIdxBL = ConvertRelToAbs (scuIdxBLtemp); - (27)

Therefore, referring to the embodiments of FIGS. 19 to 26, the coding depth and coding mode determining unit 1420 and the decoding unit 1530 according to an embodiment may be configured to determine a minimum coding unit The minimum coding unit in the upper left corner of the current prediction unit, the minimum coding unit in the upper right corner and the lower coding unit in the lower left corner of the current prediction unit, using the index ScuIdxAL for the maximum coding unit of the current prediction unit, the size CuSize of the current coding unit, The indexes ScuIdxAL, ScuIdxAR and ScuIdxBL for the maximum encoding unit of the minimum encoding unit can be determined.

FIG. 27 shows a flowchart of a video coding method based on a scan order of hierarchical data units according to an embodiment of the present invention.

In step 2710, the picture is divided into coding units of a predetermined maximum size.

In step 2720, for each maximum encoding unit, the maximum encoding unit is hierarchically divided as the depth is deepened, and the absolute position and the relative position between at least one depth encoding unit according to the hierarchical structure Encoding is performed based on the data scanning order according to the data. As a result of coding independently for each region, a coding mode for a coding depth encoding unit including information on at least one coding depth to which the coding result is output for each region is determined.

In step 2730, the information on the encoding mode and the encoded video data are output for each maximum encoding unit.

28 shows a flowchart of a video decoding method based on a scan order of a hierarchical data unit according to an embodiment of the present invention.

In step 2810, a bitstream for the encoded video is received and parsed.

In step 2820, information on the coding depth and coding mode and the encoded video data are extracted from the bitstream by the maximum coding unit.

In step 2830, the video data encoded for each coding unit of at least one coding depth of the maximum coding unit is decoded based on the information on the coding depth and the coding mode for each maximum coding unit. The encoded video data is read based on the data scan order according to the absolute position and the relative position between at least one depth-dependent encoding unit according to the hierarchical structure, and is read in accordance with the scan order and refers to the decoded neighbor information, The video data can be decoded.

In the video coding method based on the scanning order of the hierarchical data unit and the video decoding method based on the scanning order of the hierarchical data unit according to the embodiment of FIG. 21 according to the embodiment of FIG. 20, The absolute position of the coding unit and the relative position with respect to the maximum coding unit of the coding unit can be mutually converted and analyzed based on the zigzag scanning order.

In the relation between the upper coding unit and the lower coding unit in the maximum coding unit, the absolute position or the relative position of the lower coding unit can be determined using the absolute position or the relative position of the upper coding unit. Conversely, based on the absolute position of the minimum coding unit or the index of the maximum coding unit, the pixel position or index of the corresponding coding unit or prediction unit may be determined.

Further, based on the relative positions of the minimum encoding units located at the inner left upper end of the upper data unit, the relative positions of the minimum encoding units at different internal positions of the upper data unit can be determined.

Further, the availability of neighbor information can be determined from the position of the current maximum encoding unit, the index of the minimum encoding unit of the current prediction unit, and the partition type of the current prediction unit. For example, the x coordinate value and the y coordinate value of the current maximum coding unit derived from the position of the current maximum coding unit, the x coordinate value of the current coding unit derived from the index of the inner right uppermost coding unit, It is determined whether the neighbor information of the current prediction unit exists in the current picture or can be accessed and referenced in the zigzag scan order by using the y coordinate value of the current encoding unit derived from the index of the unit, The possibility can be determined.

According to an embodiment of the present invention, there is provided a video encoding method based on a scan order of a hierarchical data unit and a video decoding method based on a scan order of a hierarchical data unit according to an embodiment, The relative position and the absolute position of the macroblock are mutually converted and used. Accordingly, in using the relatively large data units and using various types of data units, it is possible to accurately and quickly analyze the position of the data units, Can be encoded or decoded.

The above-described embodiments of the present invention can be embodied in a general-purpose digital computer that can be embodied as a program that can be executed by a computer and operates the program using a computer-readable recording medium. The computer readable recording medium may be a magnetic storage medium such as a ROM, a floppy disk, a hard disk, etc., an optical reading medium such as a CD-ROM or a DVD and a carrier wave such as the Internet Lt; / RTI > transmission).

The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

Claims (3)

Dividing a picture into a plurality of maximum encoding units;
Dividing one of the maximum encoding units hierarchically into one or more encoding units according to the division information;
Determining a position of a current prediction unit in a current encoding unit among the one or more encoding units using partition type information;
Determining a position of the current prediction unit in the lower left and lower positions using the partition type information and the position of the current prediction unit;
If the minimum unit scan index corresponding to the lower left position is smaller than the scan index of the minimum unit belonging to the current prediction unit, determining that the current prediction unit can use a neighboring block corresponding to the lower left position, Including,
Wherein the scan index is based on a raster scan order among the plurality of maximum encoding units,
Between the coding units in the maximum coding unit and the minimum units in the coding unit are in accordance with the order of the upper left corner, the upper right corner, the lower left corner and the lower right corner,
Wherein the position of the current prediction unit in the lower left corner is determined using the height of the current prediction unit according to the partition type information and the position of the current prediction unit.
The method according to claim 1,
Wherein the current encoding unit is an encoding unit that is not further divided according to the division information,
Wherein the prediction unit is divided from the current encoding unit according to the partition type information.
The method according to claim 1,
Wherein the partition type information indicates a partition type that halves the height or width of the current encoding unit.

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