KR20160058741A - Method and apparatus for video encoding considering hierarchical coded block pattern, and method and apparatus for video decoding considering hierarchical coded block pattern - Google Patents

Abstract

According to the present invention, disclosed is a method for decoding a video, comprising: a step of extracting encoded image data of the current picture allocated for a maximum encoding unit as the largest encoding unit, information on encoding mode and intensity for each maximum encoding unit, and encoding unit pattern information indicating whether the texture information for each maximum encoding unit has been encoded or not by receiving/parsing a bit stream of a encoded video; and a step of decoding the encoded image data for each maximum encoding unit based on the information of the encoding mode and intensity for each maximum encoding unit and the encoding unit pattern information. According to the present invention, an encoding unit is controlled by considering the characteristics an image, thereby enhancing image compression efficiency.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a video coding method and apparatus using hierarchical coding block pattern information, a video decoding method and apparatus using the hierarchical coding block pattern information,

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. In addition, the existing video codec encodes a coded block pattern for each macroblock.

The present invention relates to encoding and decoding of video using information indicating whether or not texture information of a coding unit is coded in consideration of hierarchical depth.

According to an embodiment of the present invention, there is provided a video decoding method including: receiving and parsing a bitstream of encoded video; An encoding unit pattern for indicating whether or not texture information of a current picture allocated to a maximum encoding unit which is a maximum size encoding unit, information on a encoding depth and encoding mode of the maximum encoding unit, and texture information of the maximum encoding unit are coded Extracting information; And decoding the encoded image data for each maximum encoding unit based on the information on the encoding depth and the encoding mode for each maximum encoding unit and the encoding unit pattern information.

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. In the present specification, it is defined that the depth is deepened from a high depth or a high depth toward a low depth or a bottom depth. As the depth increases, the number of division of the maximum encoding unit increases and the total number of divisions of the maximum encoding unit corresponds to 'maximum depth'. The maximum size and the maximum depth of the encoding unit may be preset.

The coding unit pattern information of the maximum coding unit of the embodiment includes coding depth coding unit pattern information set for each coding unit of at least one coding depth included in the maximum coding unit; And hierarchical encoding unit pattern information indicating whether to encode hierarchical encoding unit pattern information of a higher depth, according to the conversion depth.

In the decoding step of the embodiment, if the encoded texture information of the encoding depth-based encoding unit exists, based on the encoding unit pattern information of the encoding depth-based encoding unit, the decoding step may include at least one conversion And extracting conversion unit pattern information indicating whether or not the texture information of the unit is coded.

The decoding step may further include decoding the encoded texture information if the encoded texture information of the conversion unit exists based on the conversion unit pattern information.

The decoding step of the embodiment may further include decoding the conversion unit using the neighbor information of the conversion unit if the encoded texture information of the conversion unit does not exist based on the conversion unit pattern information .

The coding depth decoding unit pattern information of one embodiment can be extracted according to the color component of the image data. If the encoding depth-encoding unit of the embodiment includes four or more conversion units, the luma component of the encoding depth-based encoding unit is divided into four sub-groups, and the encoding depth- More information can be extracted.

According to an aspect of the present invention, there is provided a video encoding method including: dividing a current picture into at least one maximum encoding unit that is a maximum-size encoding unit; Encoding the at least one divided area in which the area of the maximum encoding unit is divided for each depth, based on a depth that increases as the number of times of dividing the area of the maximum encoding unit increases, Determining a depth at which the result is to be output; And coding unit pattern information indicating whether or not texture information is coded for each of the maximum coding units, the coding information for the depth, the prediction mode, and the image data being the final coding result for each of the at least one divided region by the maximum coding unit And outputting.

According to an exemplary embodiment of the present invention, the outputting step may include coding and setting the coding unit pattern information according to whether the transform coefficients of the texture information of the maximum coding unit are all zeroes.

According to an exemplary embodiment of the present invention, the encoding step sets and encodes the coded DCT unit pattern information according to whether or not all the transform coefficients of the coding unit of the coding depth are 0 for each of at least one coding depth of the maximum coding unit Step < / RTI >

According to an exemplary embodiment, the outputting step may include: when the hierarchical encoding unit pattern information and the texture information for the encoding unit of the current depth are not encoded, the encoding unit pattern information for the current depth, And encoding the bitstream.

According to one embodiment, the video coding method determines whether to use at least one of the coding depth coding unit pattern information and the depth coding unit pattern information for at least one of the current picture, the slice, and the maximum coding unit The method comprising the steps of:

According to an exemplary embodiment, the outputting step may include a step of, based on the encoding unit pattern information of the maximum encoding unit, encoding the texture information of the conversion unit for each of at least one conversion unit included in the encoding depth- And determining whether to set the conversion unit pattern information.

According to an aspect of the present invention, there is provided a video decoding apparatus including: a receiving unit for receiving and parsing a bitstream of encoded video; A coding depth of the current picture, a coding depth per coding unit, a coding mode, and texture information of the maximum coding unit, which are allocated to a maximum coding unit which is the maximum coding unit from the bitstream, An extraction unit for extracting coding unit pattern information; And an image data decoding unit decoding the image data encoded by the maximum encoding unit based on information on the encoding depth and encoding mode for each of the maximum encoding units and the encoding unit pattern information.

A video encoding apparatus according to an embodiment of the present invention includes: a maximum encoding unit division unit that divides a current picture into at least one maximum encoding unit, which is a maximum-size encoding unit; Encoding the at least one divided area in which the area of the maximum encoding unit is divided for each depth, based on a depth that increases as the number of times of dividing the area of the maximum encoding unit increases, An encoding depth determination unit for determining a depth at which a result is output; And an output unit for encoding and outputting coding unit pattern information indicating whether or not the image data, the depth information, the prediction mode, and the texture information are coded, for each of the maximum coding units for each of the maximum coding units do.

The present invention includes a computer-readable recording medium on which a program for implementing a video decoding method according to an embodiment is recorded.

The present invention includes a computer-readable recording medium on which a program for implementing a video encoding method according to an embodiment 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 illustrates a video coding apparatus using coding unit pattern information according to an embodiment of the present invention.
FIG. 15 illustrates a video decoding apparatus using coding unit pattern information according to an embodiment of the present invention.
FIGS. 16A, 16B, and 16C illustrate embodiments of coding depth coding unit pattern information when the coding unit of the coding depth includes one conversion unit according to an embodiment of the present invention.
FIGS. 17A, 17B, and 17C illustrate embodiments of encoded depth-encoded unit pattern information when the encoding unit of the encoding depth includes one of four conversion units according to an embodiment of the present invention.
FIGS. 18A, 18B, and 18C illustrate embodiments of encoded depth-encoded unit pattern information when the encoding unit of the encoding depth includes a plurality of conversion units according to an embodiment of the present invention.
19 shows hierarchical coding unit pattern information according to an embodiment of the present invention.
20 illustrates a video coding method using coding unit pattern information according to an embodiment of the present invention.
FIG. 21 illustrates a video decoding method using coding unit pattern information 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 26. Referring to FIGS. 1 to 14, encoding and decoding of video based on spatially hierarchical data units according to an embodiment of the present invention will be described below, and with reference to FIGS. 14 to 26, The coding of the video using the coding unit pattern information and the decoding of the video 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 step such as predictive encoding, frequency conversion, and entropy encoding is performed. 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 image data may be a result of encoding residual data of the image.

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 bitstream 505 passes through the parsing unit 510 and the encoded image data to be decoded and the encoding-related information necessary for decoding are parsed. The encoded image 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 encoding 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, a 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 video data can be reproduced by a reproducing apparatus, stored in a storage medium, or transmitted through a network.

Hereinafter, video coding and video decoding using coding unit pattern information according to an embodiment of the present invention will be described with reference to FIGS. 14 to 26. FIG.

FIG. 14 illustrates a video coding apparatus using coding unit pattern information according to an embodiment of the present invention.

The video encoding apparatus 1400 according to one embodiment includes a maximum encoding unit division unit 1410, a coding depth determination unit 1420, and an output unit 1460. The output unit 1460 includes an encoded image data output unit 1430, an encoded information output unit 1440, and an encoded unit pattern information output unit 1450.

The maximum coding unit division unit 1410 and the coding depth determination unit 1420 correspond to the maximum coding unit division unit 110 and the coding depth determination unit 120 of the video coding apparatus 100 described above with reference to FIG. do. The encoded image data output unit 1430 and the encoded information output unit 1440 perform some functions of the output unit 130 of the video encoding apparatus 100 described above with reference to FIG. However, the features for encoding the encoding unit pattern information by the encoding unit pattern information output unit 1450 according to an embodiment will be described in detail below.

According to an embodiment, the maximum coding unit division unit 1410 divides the current picture based on the maximum coding unit which is a coding unit of the maximum size for the current picture of the picture, and the coding depth determination unit 1420 divides the current picture by the maximum coding unit The image data is encoded in the depth-dependent coding unit, and the depth at which the smallest coding error occurs is selected to determine the coding depth.

The image data output unit 1430, which is encoded according to an embodiment, outputs a bit stream of image data of the maximum encoding unit encoded based on the encoding depth. The encoding information output unit 1440 encodes and outputs information on the depth encoding mode for each maximum encoding unit.

The encoding unit pattern information output unit 1450 according to the embodiment encodes and outputs encoding unit pattern information indicating whether or not texture information is encoded for each maximum encoding unit. The texture information includes a quantization parameter, a transform coefficient, a transform index, and the like for the data unit.

The motion estimation unit 420 and the motion compensation unit 425 may be configured to perform a predetermined operation on the video data of the current encoding unit when the video encoding apparatus 1400 according to the embodiment corresponds to the image encoding unit 400. [ ), And the motion-predicted or motion-compensated data is frequency-converted and quantized through the frequency transforming unit 430 and the quantizing unit 440, thereby generating a transform coefficient of the current encoding unit do.

The coding unit pattern information for the current coding unit is set according to whether the conversion coefficient of the current coding unit thus generated is all 0 or not. The transform coefficients of the encoding units set to be encoded by the encoding unit pattern information can be outputted as a bit stream encoded by passing through the entropy encoding unit 450. [

The coding unit pattern information is used to distinguish whether the encoded texture information is transmitted or not when there is no need to encode the texture information of the encoding unit and when it is necessary to encode the texture information. For example, the coding unit pattern information is set so as to indicate that there is no need to encode texture information when all the conversion coefficients in the coding unit are zero. Conversely, if there is a non-zero transform coefficient in the encoding unit, the encoding unit pattern information is set so as to indicate that the texture information is encoded.

As the coding unit pattern information according to the embodiment, the coding depth coding unit pattern information and the hierarchical coding unit pattern information are started.

The encoded depth-encoding-unit pattern information is set only for the encoding units of at least one encoding depth in the maximum encoding unit, and indicates whether or not the texture information of the encoding unit of the encoding depth is encoded. For example, the encoded depth-encoded-unit pattern information may indicate whether all of the conversion coefficients of the depth-based encoding units of the depth-of-encoding depth are zero.

The hierarchical coding unit pattern information is set for each of at least one conversion depth. The conversion depth of the maximum size conversion unit is the lowest conversion depth, and the conversion unit is divided as the depth is deepened by one step. In addition, the conversion unit of the current conversion depth can include four conversion units of one higher conversion depth.

The hierarchical coding unit pattern information of the current conversion depth indicates whether or not the hierarchical coding unit pattern information for the largest coding units of one step lower conversion depth is coded. The coding unit pattern information output unit 1450 sets and encodes the hierarchical coding unit pattern information for each conversion depth from the highest conversion depth to the lowest conversion depth or a predetermined depth.

For example, hierarchical coding unit pattern information is set for each conversion depth, and texture information of a conversion unit is encoded at the lowest conversion depth.

Conversion depth can be interlocked with depth and coding depth. That is, the conversion depth for the conversion unit may be set to the same depth as the encoding unit, or the conversion depth may be fixed to one higher depth than the depth. Or the conversion depth may be implemented separately from the depth for the encoding unit.

The video coding apparatus 1400 according to an exemplary embodiment of the present invention may include at least one of coding depth coding unit pattern information and hierarchical coding unit pattern information for at least one data unit among a group of pictures (GOP), a picture, a slide and a maximum coding unit Or both may be selectively encoded.

For example, if both the coding depth unit coding pattern information and the hierarchical coding unit pattern information are used, the coding unit pattern information output unit 1450 sets hierarchical coding unit pattern information for each depth from the highest depth to the coding depth, At the coding depth, the coding depth coding unit pattern information of the coding unit of the coding depth can be set and encoded.

The encoding depth encoding unit may include at least one conversion unit, and conversion unit pattern information indicating whether or not the texture information is encoded may be set for each conversion unit. For example, the conversion unit pattern information indicates whether or not the conversion unit includes a non-zero conversion coefficient.

When it is necessary to encode the texture information of the conversion unit, the encoding unit pattern information output unit 1450 sets conversion unit pattern information for each conversion unit, and performs encoding depth encoding of the encoding unit including the conversion units The unit pattern information can be set and encoded.

If there are no non-zero transform coefficients in the plurality of transform units of the coded depth coding unit, the coded image data output unit 1430 need not output the coded texture information. Also, the encoding unit pattern information output unit 1450 according to the embodiment does not need to encode the conversion unit pattern information if the conversion units belonging to the same encoding depth encoding unit do not include any non-zero conversion coefficients. The coding unit pattern information output unit 1450 may set the coding depth coding unit pattern information indicating that there is no necessity of coding the texture information of the coding depth coding unit by setting the coding depth coding unit for the coding depth coding unit.

The encoded depth-encoding unit pattern information may be set according to the color component of the image data. For example, for the luma component and the chroma component, or for each of the luma component, the chroma component, the first chroma component, and the second chroma component, the encoding depth encoding unit pattern information may be set. Detailed embodiments are described in detail with respect to Figures 16a, 16b, 16c, 17a, 17b, 17c, 18a, 18b and 18c.

For each maximum encoding unit, one or more encoding unit pattern information may be set according to the depth encoding unit and the size of the conversion unit.

FIG. 15 illustrates a video decoding apparatus using coding unit pattern information according to an embodiment of the present invention.

The video decoding apparatus 1500 according to one embodiment includes a receiving unit 1501, an extracting unit 1505, and a video data decoding unit 1540. The extraction unit 1505 includes an image data acquisition unit 1510, an encoding information extraction unit 1520, and an encoding unit pattern information extraction unit 1530.

The receiving unit 1501 and the image data decoding unit 1540 correspond to the receiving unit 210 and the farrow data book enriching unit 230 of the video decoding apparatus 200 described above with reference to FIG. The video data obtaining unit 1510, the encoding information extracting unit 1520 and the video data decoding unit 1540 may be configured to store the video data and a part of the encoding information extracting unit 220 of the video decoding apparatus 200 described above with reference to FIG. Function. Hereinafter, a feature of decrypting using the coding unit pattern information extracted from the coding unit pattern information extracting unit 1530 according to one embodiment with reference to the video decoding apparatus 1500 will be described below.

The receiving unit 1501 receives and parses a bitstream of the encoded video, and the extracting unit 1505 extracts various encoded information from the parsed bitstream. The image data obtaining unit 1510 can obtain the image data encoded per maximum encoding unit from the parsed received bitstream. The encoding information extracting unit 1520 parses the received bit stream, and extracts information on the encoding depth and the encoding mode for each maximum encoding unit from the header for the current picture.

The coding unit pattern information extracting unit 1530 extracts coding unit pattern information indicating whether or not texture information of the maximum coding unit is coded for each maximum coding unit. The coding unit pattern information extracting unit 1530 can extract the coding depth coding unit pattern information and the hierarchical coding unit pattern information set for the current maximum coding unit as the coding unit pattern information.

Whether only one of the coding depth-coding unit pattern information and the hierarchical coding unit pattern information is extracted or used may be set for each GOP, picture, slide, or maximum coding unit.

One coding depth coding unit pattern information can be extracted for one coding depth coding unit and one unit of hierarchical coding unit pattern information can be extracted for each depth from the highest depth to the coding depth. One unit of the coding depth pattern information may be a predetermined number of bits. For each maximum encoding unit, one or more encoding unit pattern information may be set according to the depth encoding unit and the size of the conversion unit. For example, if the coding depth pattern information is flag type, one unit is one bit.

The image data decoding unit 1540 decodes the coded image data of each maximum coding unit based on the coding depth and coding mode information per coding unit and the coding unit pattern information to reconstruct the current picture.

The image data decoding unit 1540 according to an exemplary embodiment determines at least one coding depth of the current maximum coding unit based on information on the coding depth and the coding mode for each maximum coding unit, It is possible to grasp the hierarchical structure of the depth-dependent coding units.

In addition, the image data decoding unit 1540 performs frequency inverse transform on the transform coefficients of the texture information of the maximum encoding unit based on the encoding unit pattern information for the maximum encoding unit extracted from the encoding unit pattern information extracting unit 1530 And can decode it.

In a case where the image data decoding unit 1540 according to an embodiment corresponds to the image decoding unit 500, the transform coefficients among the texture information of the encoding units are transformed through the inverse quantization unit 530 and the frequency inverse transform unit 540, As shown in FIG.

That is, when it is confirmed that the texture information of the current coding unit is coded by the coding unit pattern information, the image data decoding unit 1540 receives the transformation coefficient of the current coding unit entropy-decoded from the entropy decoding unit 520 , And perform inverse frequency transform on the transform coefficients. The inversely transformed time-space data may be reconstructed into the reconstructed frame 595 through the intraprediction unit 550, the motion compensation unit 560, the deblocking unit 570, and the loop filtering unit 580.

The coding unit pattern information extracting unit 1530 can search the coding depth pattern coding information or the hierarchical coding pattern information as coding unit pattern information for the coding unit for each coding depth of the current maximum coding unit.

When the encoded depth-encoding-pattern information is searched, the image data decoder 1540 according to an exemplary embodiment may determine a decoding scheme of the current encoding depth based on the depth-encoded-unit pattern information.

For example, if it is determined that the texture information of the coding unit of the current coding depth is not coded based on the coding depth coding pattern information, the image data decoding unit 1540 refers to the neighbor information of the coding unit of the current coding depth, The encoding unit of the encoding depth can be decoded.

If it is determined that the texture information of the coding unit of the current coding depth is coded based on the coding depth coding pattern information, the image data decoding unit 1540 decodes the conversion coefficient among the coded texture information of the coding unit of the current coding depth, And can decode the current encoding depth encoding unit. When the hierarchical coding pattern information is searched, the image data decoding unit 1540 according to an embodiment determines whether there is hierarchical coding pattern information on the lower transformation depth of the current conversion depth, based on the hierarchical coding unit pattern information, The decoding method of the conversion unit of the current conversion depth can be determined.

For example, if it is determined that the hierarchical coding pattern information for the lower depth of the current conversion depth is present based on the hierarchical coding unit pattern information for the current conversion depth, the image data decoding unit 1540 according to the embodiment, It is preferable to confirm the hierarchical coding pattern information on the lower transform depth. On the other hand, if it is determined that there is no hierarchical coding pattern information for the lower transform depth based on the hierarchical coding unit pattern information for the current transformed depth, the image data decoding unit 1540 according to the embodiment performs the current transform It is possible to perform decoding on the conversion unit of depth.

When both the coding depth pattern coding information and the hierarchical coding pattern information are searched, the image data decoding unit 1540 according to an exemplary embodiment decodes the coding depth information Whether or not the coding of the hierarchical coding pattern information is encoded.

If it is confirmed that the hierarchical coding pattern information of the lower transformation depth exists, the hierarchical coding pattern information of the lower transformation depth should be checked. If it is determined that the hierarchical coding pattern information of the lower transform depth does not exist according to the hierarchical coding unit pattern information for the current transformed depth, the image data decoding unit 1540 according to an embodiment determines the transform unit It is possible to perform decoding on the conversion unit of the current conversion depth using the encoding depth-encoding-pattern information related to the conversion depth.

In addition, if the current depth of cut is the highest depth or the predetermined final depth, decoding may be performed on the current depth of the conversion unit irrespective of the hierarchical coding pattern information value per conversion depth. The texture information, that is, the quantization parameter, the transform coefficient, the transform index, and the like, can be decoded by decoding the transform unit of the current transform depth.

The encoding unit of the encoding depth includes at least one conversion unit, and decoding of the encoding unit can be performed through frequency inverse conversion for each conversion unit based on the conversion unit pattern information set for each conversion unit. That is, it can be confirmed whether or not the texture information of the conversion unit is encoded based on the conversion unit pattern information.

Accordingly, if it is determined that the texture information encoded in the encoding unit exists on the basis of the encoding depth-encoding unit pattern information on the encoding depth, the image data decoding unit 1540 according to an exemplary embodiment may convert Check the conversion unit pattern information.

If it is determined that the texture information encoded in the conversion unit exists on the basis of the conversion unit pattern information, the image data decoding unit 1540 according to the embodiment can invert the conversion coefficient of the conversion unit. On the other hand, if it is determined that the texture information encoded in the conversion unit does not exist on the basis of the conversion unit pattern information, the image data decoding unit 1540 according to the embodiment uses the neighbor information of the conversion unit, It is possible to decode the image data.

If it is confirmed that there is no texture information encoded in the encoding unit based on the encoding depth encoding unit pattern information for the encoding depth, the conversion unit pattern information for all the conversion units of the encoding unit is also not encoded. Therefore, in this case, the image data decoding unit 1540 according to the embodiment does not need to search the conversion unit pattern information for each conversion unit of the encoding unit.

In the video encoding apparatus 1400 and the video decoding apparatus 1500 according to the embodiment, the encoding unit pattern information or the conversion unit pattern information encoded based on the encoding unit and the conversion unit of the hierarchical structure can be used. Therefore, whether to encode the conversion unit pattern information for each conversion unit can be determined based on the encoding unit pattern information set for the encoding unit including the group of the plurality of conversion units. Compared to the conversion unit, the number of encoding units is relatively small. Compared with setting conversion unit pattern information for all conversion units, it is advantageous to use the encoding unit pattern information set for the encoding unit to reduce the amount of data, The efficiency can be improved.

Embodiments of encoded depth-encoding unit pattern information set according to color components of image data will be described below with reference to Figs. 16A, 16B, 16C, 17A, 17B, 17C, 18A, 18B and 18C. In the following embodiments, one unit of the coding unit pattern information is 1 bit, but is not limited thereto.

FIGS. 16A, 16B, and 16C illustrate embodiments of coding depth coding unit pattern information when the coding unit of the coding depth includes one conversion unit according to an embodiment of the present invention.

The first encoding unit of the color image data according to the YCbCr color standard is composed of a luma component encoding unit 1600, a first chroma component encoding unit 1610, and a second chroma component encoding unit 1620.

If the size of the conversion unit of the first encoding unit is equal to the size of the first encoding unit, the first encoding unit includes only one conversion unit. Therefore, the conversion unit of the first encoding unit is composed of a luma component conversion unit 1605, a first chroma component conversion unit 1615, and a second chroma component conversion unit 1625. The conversion unit pattern information may be set for each of the conversion units 1605, 1615, and 1625. [

16A, the coding depth coding unit pattern information is not separately encoded for the first coding unit. In this case, the coding unit pattern information output unit 1450 according to the embodiment does not output the coding depth coding unit pattern information for the first coding unit. The image data decoding unit 1540 according to the embodiment may convert the luma component conversion unit 1605, the first chroma component conversion unit 1615, and the second chroma component conversion unit 1610 without checking the encoding depth encoding unit pattern information for the first encoding unit. It is possible to perform inverse frequency conversion of the transform coefficients of the transform units 1605, 1615, and 1625 based on only the transform unit pattern information of the transform unit 1625 of two chroma components.

16B, a group 1630 including a coding unit 1600 of the luma component of the first coding unit, a coding unit 1610 of the first chroma component, and a coding unit 1620 of the second chroma component is 1 bit The coding depth-coding unit pattern information of the coding depth-coding unit is set. In this case, the coding unit pattern information output unit 1450 according to the embodiment outputs 1-bit coding depth coding unit pattern information for the first coding unit.

16C, a group 1650 including a group 1640 of luma component encoding units 1600, a first chroma component encoding unit 1610, and a second chroma component encoding unit 1620 in the first encoding unit 1-bit coded depth-coding unit pattern information is set for each group. In this case, the coding unit pattern information output unit 1450 according to an embodiment outputs a total of 2 bits of coding depth coding unit pattern information for the first coding unit.

The image data decoding unit 1540 according to the embodiment checks 1-bit Coded Depth-Coding Unit Pattern information (FIG. 16B) or 2-bit Coded Depth Coding Unit Pattern information (FIG. 16C) for the first coding unit, And checks whether the encoded texture information exists in the encoding unit. If the encoded texture information is present in the encoding unit, the image data decoding unit 1540 can confirm the conversion unit pattern information of the conversion unit and perform inverse frequency conversion on the conversion coefficient based on the information.

FIGS. 17A, 17B and 17C show embodiments of coding depth coding unit pattern information when the coding unit of coding depth includes one four conversion units according to an embodiment of the present invention.

The second encoding unit of the color image data according to the YCbCr color standard is composed of a luma component encoding unit 1700, a first chroma component encoding unit 1710, and a second chroma component encoding unit 1720.

When the second encoding unit includes four conversion units, each color-component encoding unit of the second encoding unit also includes four conversion units. That is, the encoding unit 1710 of the first chroma component includes four luma component conversion units 1702, 1704, 1706, and 1708 for the luma component encoding unit 1700, Conversion unit 1712, 1714, 1716 and 1718 and the second chroma component encoding unit 1720 includes four second chroma component conversion units 1722, 1724, 1726 and 1728.

In Fig. 17A, 1-bit encoding depth encoding unit pattern information is set for the group 1730 including only the luma component encoding unit 1600 of the first encoding unit. The coding depth encoding unit pattern information is not separately encoded for the coding unit 1710 of the first chroma component and the coding unit 1720 of the second chroma component.

In this case, the coding unit pattern information output unit 1450 according to the embodiment outputs 1 bit of coding depth coding pattern information for the coding unit 1700 of the luma component. The image data decoding unit 1540 according to an exemplary embodiment checks one-bit encoding unit pattern information for the luma component of the second encoding unit and determines whether encoded texture information is present in the encoding unit 1700 of the luma component . If the encoded texture information is present, the image data decoding unit 1540 verifies the conversion unit pattern information of the luma component conversion units 1702, 1704, 1706, and 1708, and converts the conversion unit patterns 1702, 1704, 1706, 1708) can perform frequency inverse transform.

In addition, the image data decoding unit 1540 according to an embodiment does not check the encoding depth encoding unit pattern information for the first encoding unit first chroma component and the second chroma component, and converts the encoding depth encoding unit pattern information for the first chroma component conversion unit 1712 1714, 1716, and 1718), only the conversion unit pattern information of the conversion units 1722, 1724, 1726, and 1728 of the second chroma component is checked, and conversion units 1712, 1714, 1716, 1718, 1722, 1726, and 1728 can perform frequency inverse transform.

17B, a group 1740 including the coding unit 1700 of the luma component of the second coding unit, the coding unit 1710 of the first chroma component, and the coding unit 1720 of the second chroma component is 1 bit The coding depth-coding unit pattern information of the coding depth-coding unit is set. In this case, the coding unit pattern information output unit 1450 according to the embodiment outputs 1-bit coding depth coding unit pattern information for the second coding unit.

17C, the group 1750 of the luma component encoding unit 1700 of the second encoding unit, the group 1760 of the encoding unit 1710 of the first chroma component, and the group 1760 of the encoding unit 1720 of the second chroma component 1-bit coded depth-encoding-unit pattern information is set for each group for the group 1770. In this case, the coding unit pattern information output unit 1450 according to the embodiment outputs 3 bits of coding depth coding unit pattern information for the second coding unit.

The image data decoding unit 1540 according to the embodiment checks the 1-bit depth-coded coding unit pattern information (FIG. 17B) or the 3-bit Coded Depth Coding Unit pattern information (FIG. 17C) for the second coding unit, And checks whether the encoded texture information exists in the encoding unit. If the encoded texture information is present in the encoding unit, the image data decoding unit 1540 can confirm the conversion unit pattern information of the conversion unit belonging to the encoding unit and perform inverse frequency conversion of the conversion coefficient based on the information.

FIGS. 18A, 18B, and 18C illustrate embodiments of encoded depth-encoded unit pattern information when the encoding unit of the encoding depth includes a plurality of conversion units according to an embodiment of the present invention.

The third encoding unit of the color image data according to the YCbCr color standard is composed of a luma component encoding unit 1800, a first chroma component encoding unit 1810, and a second chroma component encoding unit 1820.

When the third encoding unit includes four or more conversion units, the encoding units of luma components of the third encoding unit include the same number of conversion units. For example, when the third encoding unit includes 16 conversion units, 16 luma component conversion units (1801, 1802, 1803, 1804, 1805, 1806, 1807, 1808, 1809, 1810, 1811, 1812, 1813, 1814, 1815, 1816).

The encoding unit 1820 for the first chroma component and the encoding unit 1830 for the second chroma component may each include four conversion units. That is, the first chroma component encoding unit 1810 includes four first chroma component conversion units 1822, 1824, 1826, and 1828, and the second chroma component encoding unit 1830 includes four second (1832, 1834, 1836, 1838) of the chroma component.

As the encoded depth-encoding unit pattern information for a part of the encoding unit of the luma component, one unit of the encoding depth-encoding unit pattern information may be set for a group including a conversion unit of a predetermined number of luma components. For example, the coding depth encoding unit pattern information may be set for groups including four luma component conversion units of the luma encoding unit 1800, respectively.

That is, of the luma component encoding units 1800, a group 1840 including four conversion units 1801, 1802, 1803, and 1804, a group including four conversion units 1805, 1806, 1807, and 1808 A group 1860 including four conversion units 1850, four conversion units 1809, 1810, 1811, and 1812, and a group 1870 including four conversion units 1813, 1814, 1815, Coding unit pattern information can be set.

In Fig. 18A, the coding depth encoding unit pattern information is not separately encoded for the coding unit 1820 of the first chroma component and the coding unit 1830 of the second chroma component.

In this case, the encoding unit pattern information output unit 1450 according to an embodiment outputs 4-bit encoding depth encoding pattern information for the groups 1840, 1850, 1860, and 1870 of the luma component encoding unit. The image data decoding unit 1540 according to an embodiment identifies the 4-bit Coded Depth-Coding Unit pattern information for the luma component of the third coding unit and outputs the 4-bit Coded Depth-Coding Unit Pattern information to the luma component coding unit groups 1840, 1850, 1860, 1870 ) Of the texture information.

In addition, the image data decoding unit 1540 according to an embodiment does not check the encoding depth encoding unit pattern information for the first encoding unit first chroma component and the second chroma component, , 1824, 1826, and 1828), and only the conversion unit pattern information of the conversion units 1832, 1834, 1836, and 1838 of the second chroma component can be confirmed.

18B, the groups 1840, 1850, 1860 and 1870 of luma components of the third encoding unit, the group 1880 of the encoding units 1820 of the first chroma component, 1-bit coded depth-coding unit pattern information is set for each group in the group 1885 of the group 1885 of the coded-depth-coded information 1830. In this case, the coding unit pattern information output unit 1450 according to an embodiment outputs 6-bit coding depth coding unit pattern information for the second coding unit.

18C includes groups 1840, 1850, 1860 and 1870 of luma components of the third encoding unit, encoding unit 1820 of the first chroma component and encoding unit 1830 of the second chroma component 1-bit coded depth-coding unit pattern information is set for each group for the group 1890 to be coded. In this case, the coding unit pattern information output unit 1450 according to the embodiment outputs 5-bit coding depth coding unit pattern information for the second coding unit.

The image data decoding unit 1540 according to the embodiment checks 6-bit Coded Depth-Coding Unit Pattern information (FIG. 18B) or 5-bit Coded Depth Coding Unit pattern information (FIG. 18C) for the second coding unit, And checks whether the encoded texture information exists in the encoding unit. If the encoded texture information is present in the encoding unit, the image data decoding unit 1540 can confirm the conversion unit pattern information of the conversion unit included in the encoding unit, and perform inverse frequency conversion on the conversion coefficient based on the information.

19 shows hierarchical coding unit pattern information according to an embodiment of the present invention.

The conversion units 1912, 1914, 1916, 1918, 1920, 1930, 1942, 1944, 1946, 1948, 1954, 1956 and 1958 are set for the maximum encoding unit 1900, . For example, although the conversion unit of the same size as the maximum encoding unit 1900 corresponds to the conversion depth 0, the maximum encoding unit 1900 does not include the conversion unit of the conversion depth 0.

Conversion depth 1 is a conversion unit of half the height and width of a conversion unit of conversion depth 0, and conversion units 1920 and 1930 correspond to conversion depth 1. In this way, the conversion units 1912, 1914, 1916, 1918, 1954, 1956 and 1958 correspond to the conversion depth 2, and the conversion units 1942, 1944, 1946 and 1948 correspond to the conversion depth 3.

The hierarchical coding unit pattern information indicates whether or not hierarchical coding unit pattern information on the lower conversion depth is to be coded. In addition, according to the hierarchical coding unit pattern information, information on whether or not the texture information of the lower transformation depth is encoded can be derived.

Since the maximum encoding unit (1900) does not have a conversion unit of conversion depth 0, it is necessary to encode the texture information of the conversion unit of conversion conversion depth 1 of conversion depth 0. Therefore, 1-bit hierarchical coding unit pattern information 1960 is set for the conversion depth 0.

In the conversion depth 1, since the conversion units 1920 and 1930 are to be decoded at the current conversion depth 1, the texture information of the conversion unit of the lower conversion depth 2 need not be encoded. In addition, the hierarchical coding unit pattern information of the lower transformation depth 2 does not need to be set. Hence, for each of the conversion units 1920 and 1930, the hierarchical coding unit pattern information of the conversion depth 1 indicating that the texture information of the hierarchical coding unit pattern information of the lower conversion depth 2 need not be encoded is required for each bit.

However, for each of the groups of conversion depths 1 including conversion units 1912, 1914, 1916 and 1918 and for each group of conversion depths 1 including conversion units 1942, 1944, 1946, 1948, 1954, 1956 and 1958, It is necessary to encode the texture information of the conversion unit of 2. Therefore, it is necessary to encode the coding unit pattern information of the sub-conversion depth 2, and the hierarchical coding unit pattern information of the conversion depth 1 representing the same should be set for each group by one bit.

Therefore, a total of 4 bits of hierarchical coding unit pattern information 1970 is set for the conversion depth 1.

In the conversion depth 2, since the conversion units 1912, 1914, 1916, 1918, 1954, 1956 and 1958 are to be decoded at the current conversion depth 2, the texture information of the conversion unit of the further lower conversion depth 3 need not be encoded, The hierarchical coding unit pattern information of depth 3 need not be set. Therefore, for each of the conversion units 1912, 1914, 1916, 1918, 1954, 1956, and 1958, the hierarchical encoding unit pattern information of the conversion depth 2 indicating that the encoding of the hierarchical encoding unit pattern information of the lower conversion depth 3 is not necessary One bit per conversion unit is required.

However, for the group of the conversion depth 2 including the conversion units 1942, 1944, 1946 and 1948, it is necessary to encode the texture information of the conversion unit of the lower conversion depth 3. Therefore, it is necessary to encode the coding unit pattern information of the lower conversion depth 3, and one bit of the hierarchical coding unit pattern information of the conversion depth 2 should be set.

Therefore, a total of 8 bits of hierarchical coding unit pattern information 1980 is set for the conversion depth 2.

Since the conversion depth 3 is the final conversion depth, the hierarchical coding unit pattern information of the conversion depth 3 indicating that the hierarchical coding unit pattern information of the lower conversion depth need not be encoded for the conversion units 1942, 1944, 1946 and 1948, You should set a bit by bit. Therefore, a total of 4 bits of hierarchical coding unit pattern information 1990 can be set for the conversion depth of 3.

20 illustrates a video coding method using coding unit pattern information according to an embodiment of the present invention.

In step 2010, the current picture is divided into at least one maximum coding unit, which is a coding unit of the maximum size. In step 2020, the coding unit is coded into at least one divided area in which the area of the maximum coding unit is divided for each depth, The depth at which the final encoding result is output is determined.

In step 2030, image data encoded with one coding depth for each maximum coding unit, and information on the coding depth and coding mode are coded and output. Also, the coding unit pattern information is coded and output for each maximum coding unit.

As the coding unit pattern information of the maximum coding unit, coding depth coding unit pattern information indicating whether or not the texture information of the coding unit of each coding depth in the maximum coding unit is coded can be encoded. When the hierarchical coding unit pattern information is coded hierarchically according to the conversion depth, the hierarchical coding unit pattern information for each conversion depth is coded in such a manner that the hierarchical coding unit pattern information of the lower conversion depth of the conversion depth is coded Respectively.

FIG. 21 illustrates a video decoding method using coding unit pattern information according to an embodiment of the present invention.

In step 2110, the bitstream for the encoded video is received and parsed.

In step 2120, the image data of the current picture allocated to the maximum encoding unit of the maximum size from the parsed bit stream, and the information on the encoding depth and coding mode of each encoding unit are extracted. Also, encoding unit pattern information indicating whether or not the texture information of the maximum encoding unit is encoded is extracted for each maximum encoding unit. As the coding unit pattern information of the maximum coding unit, the coding depth coding unit pattern information and the hierarchical coding unit pattern information for the coding unit for each coding depth of the maximum coding unit can be extracted.

In step 2130, the encoded image data of the maximum encoding unit is decoded based on the information on the encoding depth and encoding mode and the encoding unit pattern information for each maximum encoding unit, and the image data is restored. It is possible to confirm whether or not the texture information of the coding unit of the coding depth is coded based on the coding depth coding unit pattern information. It is also possible to confirm whether or not the hierarchical coding unit pattern information of the lower transformation depth is coded based on the hierarchical coding unit pattern information for each conversion depth.

In the coding unit of the coding depth, the conversion coefficient is frequency-inversely converted based on the conversion unit pattern information for the conversion unit, and the encoded data of the conversion unit can be decoded.

In the conventional technique using macroblock units for frequency conversion of image data as conversion units, macroblocks of 16x16 or 8x8 size are used as conversion units for frequency conversion and inverse frequency conversion of image data. As a result of encoding, coded block pattern information is encoded and transmitted for each macroblock, and is used in the decoding process.

On the other hand, by using the coding unit pattern information based on the coding unit and the conversion unit of the hierarchical structure according to the embodiment, it is possible to encode the coding block pattern information for a coding unit having a size larger than a macroblock or an arbitrary size , The encoding unit pattern information can be encoded integrally with respect to the encoding units including a plurality of conversion units in a hierarchical structure. Therefore, the efficiency of coding and transmitting the coding unit pattern information is improved.

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 (5)

Dividing a picture into at least one maximum encoding unit using information on a maximum size of the encoding units obtained from the bitstream;
Determining one or more encoding units from the at least one maximum encoding unit using the partition information obtained from the bitstream;
Acquiring, from the bitstream, conversion index information indicating whether or not the current level conversion unit included in the current encoding unit among the one or more encoding units is divided;
Dividing the conversion unit of the current level into conversion units of lower level if the conversion index information indicates division of the conversion unit of the current level; And
And acquiring pattern information on a conversion unit of the current level if the conversion index information indicates non-division of the conversion unit of the current level,
Wherein the pattern information indicates whether the conversion unit of the current level includes a non-zero conversion coefficient,
Wherein the conversion unit of the current level is divided into four lower-level conversion units.
The method according to claim 1,
Wherein the current level conversion unit is included in the current encoding unit,
Wherein the size of the current level conversion unit is equal to or smaller than the size of the encoding unit.
3. The method of claim 2,
Wherein the current level conversion unit is determined by dividing a height and a width of the current encoding unit.
The method according to claim 1,
Wherein the current encoding unit is a data unit in which a picture of the encoded video is encoded and the conversion unit of the current level is a data unit in which the data of the current encoding unit is converted.
The picture is divided into at least one maximum encoding unit using information on the maximum size of the encoding units obtained from the bit stream,
Determining at least one encoding unit from the at least one maximum encoding unit using the segmentation information obtained from the bitstream,
Acquiring, from the bitstream, conversion index information indicating whether or not the conversion unit of the current level included in the current encoding unit among the one or more encoding units is divided,
And if the conversion index information indicates division of the conversion unit of the current level, the conversion unit of the current level is divided into conversion units of the lower level,
And a decoding unit for obtaining pattern information on a conversion unit of the current level if the conversion index information indicates non-division of the conversion unit of the current level,
Wherein the pattern information indicates whether the conversion unit of the current level includes a non-zero conversion coefficient,
Wherein the conversion unit of the current level is divided into four lower-level conversion units.

Images