KR20140088002A - Video encoding and decoding method and apparatus using the same - Google Patents

Video encoding and decoding method and apparatus using the same Download PDF

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Publication number
KR20140088002A
KR20140088002A KR1020130142737A KR20130142737A KR20140088002A KR 20140088002 A KR20140088002 A KR 20140088002A KR 1020130142737 A KR1020130142737 A KR 1020130142737A KR 20130142737 A KR20130142737 A KR 20130142737A KR 20140088002 A KR20140088002 A KR 20140088002A
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size
block
layer
target block
prediction
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KR1020130142737A
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Korean (ko)
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이하현
이진호
강정원
최진수
김진웅
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한국전자통신연구원
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Priority to US14/136,709 priority Critical patent/US20140185671A1/en
Publication of KR20140088002A publication Critical patent/KR20140088002A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards

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  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

A method for decoding a video according to the present invention, capable of supporting a plurality of layers, includes the steps of: decoding a first layer referred by a decoding target block at a second layer; determining a size of the target block at the second layer which may use the information of the first layer; and performing a prediction for the target block using the information of the first layer according to the determination result.

Description

TECHNICAL FIELD [0001] The present invention relates to a video encoding / decoding method, and a video encoding /

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video encoding and decoding process, and more particularly, to a video encoding and decoding method and apparatus for supporting a plurality of layers in a bitstream.

Recently, broadcasting service having high definition (HD) resolution has been expanded not only in domestic but also in the world, so that many users are accustomed to high definition and high definition video, and accordingly, many organizations are spurring development for next generation video equipment. In addition, with the increase of interest in UHD (Ultra High Definition) having resolution more than 4 times of HDTV in addition to HDTV, a compression technique for a higher resolution and a higher image quality is required.

An inter prediction technique for predicting a pixel value included in a current picture from temporally preceding and / or following pictures for image compression, a prediction method of predicting a pixel value included in a current picture using pixel information in the current picture An intra prediction technique, an entropy coding technique in which a short code is assigned to a symbol having a high appearance frequency and a long code is assigned to a symbol having a low appearance frequency.

There is a technique for providing a constant network bandwidth under a limited operating environment of hardware without considering a flexible network environment. However, a new compression technique is required in order to compress image data applied to a network environment in which the bandwidth varies from time to time, and a scalable video encoding / decoding method can be used for this purpose.

In performing inter-layer texture prediction, the present invention allows layer-to-layer texture prediction to be performed only when the size of a block of a second layer and a block to be decoded fall within a specific range.

Thus, not only the increase in complexity according to various block sizes is reduced, but also the generation probability is regularized in the entropy decoding of the inter-layer texture prediction indicator.

The purpose of this is to improve the efficiency of image decoding and decoding.

According to an embodiment of the present invention, there is provided a method of decoding an image supporting a plurality of layers, the method comprising: decoding a first layer referenced by a target block of a second layer to be decoded; Determining a size of the target block of the second layer that can utilize the information of the first layer; And performing prediction on the target block using the information of the first layer according to the determined result.

The step of determining the size of the target block may determine the size of the target block as all allowable block sizes defined by the encoding apparatus.

The step of determining the size of the target block may determine the block size set by a predetermined rule set implicitly with the encoding apparatus to be the size of the target block.

The step of determining the size of the target block may determine the maximum block size allowed by the encoding device as the size of the target block.

The step of determining the size of the target block may determine the minimum block size allowed by the encoding device as the size of the target block.

Wherein the step of determining the size of the target block includes parsing a size range indicator sent from an encoding device, wherein the size range indicator includes a maximum size range syntax that is transmitted in one of SPS, PPS, Element and a minimum size range syntax element.

Wherein the step of determining the size of the target block comprises the steps of parsing a maximum size range syntax element of a target block represented by a difference between the minimum block size and an indicator of a minimum block size allowed by the encoding device, And the maximum block size of the target block may be determined as a sum of the difference values to a minimum block size by the indicator.

The step of determining the size of the target block may parse a syntax element expressed by a difference between a minimum block size and a maximum block size allowed by the encoding device transmitted from the encoding device.

The step of performing prediction on the target block may include: parsing flag information indicating that the first layer is used when intra BL prediction is applied to the target block; And using the decoded block signal of the first layer as a prediction signal having a difference signal if the flag information is 1.

The step of performing prediction on the target block may include: parsing flag information indicating use of the first layer when intra BL skip prediction is applied to the target block; And using the decoded block signal of the first layer as a prediction signal having no differential signal if the flag information is 1.

According to another aspect of the present invention, an apparatus for decoding an image supporting a plurality of layers includes a first layer decoding unit decoding a first layer referenced by a target block of a second layer to be decoded; A second layer decoding unit for determining a size of the target block in the second layer capable of using the information in the first layer and performing prediction on the target block using the information in the first layer according to the determined result, Section.

According to an embodiment of the present invention, in performing inter-layer texture prediction, only when a size of a block of a second layer and a block of a decoding target falls within a specific range, A coding / decoding method and apparatus are provided.

According to another aspect of the present invention, there is provided a method and apparatus for encoding / decoding an image, which can reduce the increase in complexity according to various block sizes, and can regularly generate the probability of occurrence in entropy decoding of an inter-layer texture prediction indicator.

There is provided a method and apparatus for encoding / decoding an image, which can improve the efficiency of subtracting and decoding an image.

1 is a block diagram showing a configuration of an image encoding apparatus according to an embodiment of the present invention.
2 is a block diagram illustrating a configuration of an image decoding apparatus according to an embodiment of the present invention.
3 is a conceptual diagram schematically showing an embodiment of a scalable video coding structure using a plurality of layers to which the present invention can be applied.
4 is a block diagram illustrating a target block and a reference block according to an embodiment of the present invention.
5 is a control flowchart for explaining a method of coding a second layer with reference to a first layer in an encoding apparatus according to the present invention.
6 is a control flowchart for explaining a method of decoding a second layer with reference to a first layer in a decoding apparatus according to the present invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . In addition, the description of "including" a specific configuration in the present invention does not exclude a configuration other than the configuration, and means that additional configurations can be included in the practice of the present invention or the technical scope of the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

In addition, the components shown in the embodiments of the present invention are shown independently to represent different characteristic functions, which does not mean that each component is composed of separate hardware or software constituent units. That is, each constituent unit is included in each constituent unit for convenience of explanation, and at least two constituent units of the constituent units may be combined to form one constituent unit, or one constituent unit may be divided into a plurality of constituent units to perform a function. The integrated embodiments and separate embodiments of the components are also included within the scope of the present invention, unless they depart from the essence of the present invention.

In addition, some of the components are not essential components to perform essential functions in the present invention, but may be optional components only to improve performance. The present invention can be implemented only with components essential for realizing the essence of the present invention, except for the components used for the performance improvement, and can be implemented by only including the essential components except the optional components used for performance improvement Are also included in the scope of the present invention.

1 is a block diagram showing a configuration of an image encoding apparatus according to an embodiment of the present invention. A scalable video encoding / decoding method or apparatus may be implemented by a general image encoding / decoding method or apparatus extension that does not provide scalability, and the block diagram of FIG. 1 is a scalable 1 shows an embodiment of a video encoding apparatus that can be a basis of a video encoding apparatus.

1, the image encoding apparatus 100 includes a motion prediction unit 111, a motion compensation unit 112, an intra prediction unit 120, a switch 115, a subtractor 125, a transform unit 130, A quantization unit 140, an entropy encoding unit 150, an inverse quantization unit 160, an inverse transformation unit 170, an adder 175, a filter unit 180, and a reference image buffer 190.

The image encoding apparatus 100 may encode an input image in an intra mode or an inter mode and output a bit stream. Intra prediction is intra prediction, and inter prediction is inter prediction. In the intra mode, the switch 115 is switched to the intra mode, and in the inter mode, the switch 115 is switched to the inter mode. The image encoding apparatus 100 may generate a prediction block for an input block of the input image, and may then code the difference between the input block and the prediction block.

In the intra mode, the intraprediction unit 120 may generate a prediction block by performing spatial prediction using the pixel value of the already coded block around the current block.

In the inter mode, the motion predicting unit 111 may obtain a motion vector by searching an area of the reference image stored in the reference image buffer 190, which is best matched with the input block, in the motion estimation process. The motion compensation unit 112 may generate a prediction block by performing motion compensation using a motion vector and a reference image stored in the reference image buffer 190.

The subtractor 125 may generate a residual block by a difference between the input block and the generated prediction block. The transforming unit 130 may perform a transform on the residual block to output a transform coefficient. The quantization unit 140 may quantize the input transform coefficient according to the quantization parameter to output a quantized coefficient.

The entropy encoding unit 150 entropy-codes a symbol according to a probability distribution based on the values calculated by the quantization unit 140 or the encoding parameter value calculated in the encoding process to obtain a bit stream Can be output. The entropy coding method is a method of receiving symbols having various values and expressing them as decodable binary numbers while eliminating statistical redundancy.

Here, the symbol means a syntax element to be encoded / decoded, a coding parameter, a value of a residual signal, and the like. The encoding parameter is a parameter necessary for encoding and decoding. The encoding parameter may include information that can be inferred in an encoding or decoding process, as well as information encoded and encoded in a encoding device such as a syntax element, and may be encoded or decoded It means the information that is needed when doing. The coding parameters include, for example, values such as intra / inter prediction mode, motion / motion vector, reference picture index, coding block pattern, presence of residual signal, transform coefficient, quantized transform coefficient, quantization parameter, block size, Statistics can be included. In addition, the residual signal may mean a difference between the original signal and the prediction signal, or a signal in which the difference between the original signal and the prediction signal is transformed or a difference between the original signal and the prediction signal is transformed and the quantized signal . The residual signal can be regarded as a residual block in block units.

When entropy coding is applied, a small number of bits are allocated to a symbol having a high probability of occurrence, and a large number of bits are allocated to a symbol having a low probability of occurrence, so that the size of a bit string for the symbols to be coded Can be reduced. Therefore, the compression performance of the image encoding can be enhanced through the entropy encoding.

For entropy encoding, an encoding method such as exponential golomb, context-adaptive variable length coding (CAVLC), and context-adaptive binary arithmetic coding (CABAC) may be used. For example, a table for performing entropy encoding such as a variable length coding / code (VLC) table may be stored in the entropy encoding unit 150, and the entropy encoding unit 150 may store the stored variable length encoding (VLC) table for performing entropy encoding. Further, the entropy encoding unit 150 derives a binarization method of a target symbol and a probability model of a target symbol / bin, and then performs entropy encoding using the derived binarization method or probability model You may.

The quantized coefficients can be inversely quantized in the inverse quantization unit 160 and inversely transformed in the inverse transformation unit 170. The inverse quantized and inverse transformed coefficients can be added to the prediction block through the adder 175 and a reconstruction block can be generated.

The restoration block passes through the filter unit 180 and the filter unit 180 applies at least one of a deblocking filter, a sample adaptive offset (SAO), and an adaptive loop filter (ALF) can do. The restoration block having passed through the filter unit 180 may be stored in the reference image buffer 190.

2 is a block diagram illustrating a configuration of an image decoding apparatus according to an embodiment of the present invention. As described above with reference to FIG. 1, the scalable video encoding / decoding method or apparatus may be implemented by expanding a general image encoding / decoding method or apparatus that does not provide scalability, and the block diagram of FIG. 2 illustrates scalable video decoding / 1 shows an embodiment of an image decoding apparatus which can be the basis of the apparatus.

2, the image decoding apparatus 200 includes an entropy decoding unit 210, an inverse quantization unit 220, an inverse transform unit 230, an intra prediction unit 240, a motion compensation unit 250, (260) and a reference image buffer (270).

The video decoding apparatus 200 receives the bit stream output from the encoding apparatus and decodes the video stream into the intra mode or the inter mode, and outputs the reconstructed video, that is, the reconstructed video. In the intra mode, the switch is switched to the intra mode, and in the inter mode, the switch can be switched to the inter mode. The video decoding apparatus 200 may generate a reconstructed block, i.e., a reconstructed block, by obtaining a reconstructed residual block from the input bitstream, generating a predicted block, and adding the reconstructed residual block to the predicted block.

The entropy decoding unit 210 may entropy-decode the input bitstream according to a probability distribution to generate symbols including a symbol of a quantized coefficient type. The entropy decoding method is a method of generating each symbol by receiving a binary sequence. The entropy decoding method is similar to the entropy encoding method described above.

The quantized coefficients are inversely quantized in the inverse quantization unit 220 and inversely transformed in the inverse transformation unit 230. As a result that the quantized coefficients are inversely quantized / inverse transformed, reconstructed residual blocks can be generated.

In the intra mode, the intraprediction unit 240 can generate a prediction block by performing spatial prediction using the pixel value of the already coded block around the current block. In the inter mode, the motion compensation unit 250 can generate a prediction block by performing motion compensation using a motion vector and a reference image stored in the reference image buffer 270. [

The restored residual block and the prediction block are added through the adder 255, and the added block is passed through the filter unit 260. The filter unit 260 may apply at least one of a deblocking filter, SAO, and ALF to a restoration block or a restored picture. The filter unit 260 outputs a reconstructed image, that is, a reconstructed image. The restored image is stored in the reference image buffer 270 and can be used for inter-view prediction.

An entropy decoding unit 210, an inverse quantization unit 220, an inverse transform unit 230, an intra prediction unit 240, a motion compensation unit 250, a filter unit 260 included in the image decoding apparatus 200, An entropy decoding unit 210, an inverse quantization unit 220, an inverse transform unit 230, an intraprediction unit 240, a motion compensation unit 240, And the filter unit 260 may be expressed as a decoding unit or a decoding unit.

In addition, the video decoding apparatus 200 may further include a parsing unit (not shown) for parsing information related to the encoded video included in the bitstream. The parsing unit may include an entropy decoding unit 210 or may be included in the entropy decoding unit 210. Such a parsing unit may also be implemented as one component of the decoding unit.

3 is a conceptual diagram schematically showing an embodiment of a scalable video coding structure using a plurality of layers to which the present invention can be applied. In FIG. 3, a GOP (Group of Pictures) represents a picture group, that is, a group of pictures.

In order to transmit video data, a transmission medium is required, and the performance of the transmission medium varies depending on various network environments. A scalable video coding method may be provided for application to these various transmission media or network environments.

The scalable video coding method is a coding method for enhancing the coding / decoding performance by eliminating inter-layer redundancy by utilizing texture information, motion information, residual signal, etc. between layers. The scalable video coding method can provide various scalabilities in terms of spatial, temporal, and image quality according to surrounding conditions such as a transmission bit rate, a transmission error rate, and a system resource.

Scalable video coding can be performed using multiple layers structure to provide a bitstream applicable to various network situations. For example, the scalable video coding structure may include a base layer that compresses and processes image data using a general image encoding method, and compresses and compresses the image data using the base layer encoding information and general image encoding method Lt; RTI ID = 0.0 > layer. ≪ / RTI >

Here, the layer may be classified into a video and a bit classified based on spatial (e.g., image size), temporal (e.g., coding order, image output order, frame rate), image quality, Means a set of bitstreams. In addition, the base layer may be a lower layer, a reference layer or a base layer, an enhancement layer may mean an enhancement layer, and an enhancement layer. The plurality of layers may also have dependencies between each other.

Referring to FIG. 3, for example, the base layer may be defined by a standard definition (SD), a frame rate of 15 Hz, a bit rate of 1 Mbps, and a first enhancement layer may be defined as high definition (HD), a frame rate of 30 Hz, And the second enhancement layer may be defined as 4K-UHE (ultra high definition), a frame rate of 60 Hz, and a bit rate of 27.2 Mbps. The format, the frame rate, the bit rate, and the like are one example, and can be determined as needed. Also, the number of layers to be used is not limited to the present embodiment, but can be otherwise determined depending on the situation.

For example, if the transmission bandwidth is 4 Mbps, the frame rate of the first enhancement layer HD may be reduced to 15 Hz or less. The scalable video coding method can provide temporal, spatial, and image quality scalability by the method described in the embodiment of FIG.

In the case of coding and decoding of video supporting a plurality of layers in a bitstream, that is, scalable coding, there is a strong correlation between a plurality of layers. Therefore, if prediction is performed using this association, It is possible to eliminate the redundant elements and improve the image coding performance. Hereinafter, prediction of a current layer to be predicted using information of another layer is referred to as inter-layer prediction. Scalable video coding has the same meaning as scalable video coding in view of coding and scalable video decoding in view of decoding.

At least one of the plurality of layers may be different from one another in resolution, frame rate, and color format, and upsampling or downsampling of the layer may be performed for adjusting the resolution in inter-layer prediction.

In inter-layer prediction, which predicts an upper layer using information of a lower layer, inter-layer texture prediction is performed using a texture of a lower layer, intra-picture prediction mode information, motion information, syntax information, Inter-layer inter prediction, inter-layer syntax prediction, and the like.

The inter-layer texture prediction means that the texture of the reference block in the lower layer is used as a prediction sample of the current block of the upper layer. At this time, the texture of the reference block can be scaled by up-sampling.

In inter-layer texture prediction, the intra-BL scheme may be used in which the reconstructed value of the reference block in the lower layer is up-sampled and the up-sampled reference block is used as a prediction value for the current block, You can also access the upsampled sublayer in memory and use a reference index method that uses the stored sublayer as a reference index.

Hereinafter, for convenience of explanation, the upper layer to which the target block to be encoded and decoded belongs is referred to as a second layer, and the lower layer to which the second layer refers is represented as a first layer.

According to the present invention, it is determined whether to perform inter-layer texture prediction according to the size of a block of a second layer and a block to be decoded to perform inter-layer texture prediction, subtraction and decoding to remove redundancy of texture information existing between layers, Thereby improving the efficiency.

In performing inter-layer texture prediction on the second layer sub-block and the current block to be decoded, the encoding apparatus can determine the encoding prediction mode after performing inter-layer texture prediction on all block sizes.

In addition, the decoding apparatus may determine whether to use inter-layer texture prediction after parsing the inter-layer texture prediction indicator for all block sizes.

However, if the image size increases and various block sizes are used, if the inter-layer texture prediction is performed for all block sizes, the complexity tends to increase in the case of the encoding apparatus, and the inter- In decoding, the coding efficiency may be degraded due to the irregular occurrence probability.

According to an embodiment of the present invention, in order to solve the above-described problem, in performing inter-layer texture prediction, inter-layer texture prediction is performed only when the size of the sub- To be performed.

If the sizes of the blocks to be coded and decoded are limited as described above, not only the increase in complexity according to various block sizes is reduced, but also the occurrence probabilities can be regularized even when the inter-layer texture prediction indicator is entropy- Can be improved.

4 is a block diagram illustrating a target block and a reference block according to an embodiment of the present invention. For convenience of explanation, the corresponding part of the first hierarchical layer 401 corresponding to the target block 410 of the second hierarchical layer 400 is denoted by a reference block 411. The object block 410 according to the present invention may be a coding block, a prediction block, or a transform block.

When the prediction of the target block is performed by using the reconstruction value information of the first layer 401, the reference block 411 determines whether the position of the reference block 411 is changed according to the resolution ratio of the second layer 400 and the first layer 401 . That is, the coordinates specifying the position of the target block 410 may correspond to the specific coordinates of the first layer 401 according to the resolution ratio. The reference block 411 may include one prediction unit or a plurality of prediction units.

The encoding apparatus may include an encoding unit for encoding the first layer 401 and an encoding unit for encoding the second layer 400. In this case, the configuration of the image encoding apparatus of FIG. Respectively.

The decoding apparatus may include a decoding unit for decoding the first layer 401 and a decoding unit for decoding the second layer 400. In this case, the configuration of the video decoding apparatus of FIG. Respectively.

The encoder and decoder may use the reconstruction value of the reference block 411 to generate a prediction value for the object block 410. At this time, the encoding apparatus and the decoding apparatus can scale the restored value of the reference block 411 by upsampling.

5 is a control flowchart for explaining a method of coding a second layer with reference to a first layer in an encoding apparatus according to the present invention.

Referring to FIG. 5, the encoding apparatus decodes a first layer block referred to by a target block in the second layer (S510).

The first layer block referenced by the target block in the second layer may be decoded according to a coding scheme of a reference layer that can be transmitted in a VPS (Video Parameter Set), SPS (Sequence Parameter Set), or the like.

For example, if the reference layer is encoded in the MPEG-2 scheme, the encoding apparatus can decode the first layer block according to the MPEG-2 scheme.

Alternatively, when the reference layer is coded by the H.264 / AVC scheme, the encoding apparatus can decode the first layer block according to the H.264 / AVC scheme.

Or the HEVC scheme of the reference layer, the encoding apparatus can perform decoding of the first layer block according to the HEVC scheme.

As described above, the first layer and the second layer can be encoded in respective encoding units, and the first layer can be predicted, restored, and encoded before the second layer.

The decoded first layer may be stored in a memory such as a DPB (Decoded Picture Buffer). The stored first layer may be deleted from the memory after being referred to by the second layer, or may be stored in the memory for a preset time.

When the block of the first hierarchy is decoded, the encoding apparatus can determine the size range of the target block of the second hierarchy that can use the information of the first hierarchy (S520).

Various methods can be applied when the encoding apparatus determines the size range of the target block.

According to an embodiment of the present invention, the encoding apparatus can determine the size range of the second hierarchical object block so that the information of the first hierarchical layer can be used for all allowable block sizes.

For example, when the size range of the preset allowable block is 64x64 to 8x8, the encoding apparatus can determine the size range of the target block in which the decoded block signal of the first hierarchy is available to be 64x64 to 8x8.

Alternatively, when the size range of the preset allowable block is 64x64 to 16x16, the encoding apparatus can determine the size range of the target block that can use the decoded block signal of the first layer to be 64x64 to 16x16.

Alternatively, the encoding apparatus may determine the size range of the second hierarchical object block so that the first hierarchical information can be used for all allowable block sizes defined by the encoding apparatus.

According to another embodiment of the present invention, the encoding apparatus can determine the size range of the second layer target block that can use the information of the first layer according to the implicit rule between the decryption apparatuses.

For example, the encoding apparatus can limit the size range of a target block that can use the information of the first layer to 64x64 or 8x8 according to an implicit rule between the decryption apparatuses.

Alternatively, the encoding apparatus may determine the range of the size of the target block in which the information of the first layer can be used as the range of the maximum and minimum values such as 8x8 or more and 32x32 or less, 16x16 or 16x16 or more.

Alternatively, the encoding apparatus may determine the size range of the target block that can use the information of the first layer to be the maximum block size allowed by the encoding apparatus, or may determine the minimum block size allowed by the encoding apparatus.

Alternatively, the encoding apparatus may set various size ranges in addition to the size or size range of the target block described above according to an implicit rule with the encoding apparatus, or may change the size or size range of the target block.

When the size range of the second hierarchical object block capable of using the information of the first hierarchical level is determined according to the implicit rule between the decoding apparatus and the encoding apparatus, The size range can be signaled via a separate indicator.

The encoding apparatus may encode information including information capable of determining a minimum size of a block and a maximum size information of a block in a sequence parameter set (SPS), a picture parameter set (PPS), a slide header, and the like.

For example, the encoding apparatus can signal the minimum size or maximum size information of the block using syntax elements such as log2_min_luma_intrabl_size_minus3, log2_max_luma_intrabl_size_minus3, log2_max_luma_intrablskip_size_minus3, and log2_max_luma_intrablskip_size_minus3.

Alternatively, the encoding apparatus can encode the maximum size information of the target block of the second layer, which can use the information of the first layer, by expressing it as a difference value with respect to the minimum block size.

For example, the encoding apparatus can signal the maximum size information of a target block using syntax elements such as log2_diff_max_min_luma_intrabl_size, log2_diff_max_min_luma_intrablskip_size.

As another example, the encoding apparatus may signal the maximum and minimum size information of the allowable block by expressing the difference between the minimum size and the maximum size information (for example, log2_min_luma_coding_block_size_minus3 or log2_diff_max_min_luma_coding_block_size) defined in the SPS It is possible.

In this way, the encoding apparatus according to the present invention allows the inter-layer texture prediction to be performed only when the size of a block to be encoded of the second layer falls within a specific range in performing inter-layer texture prediction, And it is possible to regularize the probability of occurrence in the entropy portion and the decoding of the inter-layer texture prediction indicator. Thus, the coding efficiency of the image can be improved.

If the size range of the target block of the second hierarchy which can use the information of the first hierarchy is determined, the encoding apparatus can perform the prediction on the target block (S530). That is, when the size of a target block to be encoded corresponds to a block size range determined by any one of the above methods, the encoding apparatus predicts a target block using the decoded block signal of the first layer can do.

The encoding apparatus can perform Intra BL (Intra BL) prediction using the decoded block signal of the first layer as a prediction signal having the differential signal of the second layer target block. That is, the encoding apparatus can upsample the reconstructed value of the reference block in the first layer and use the upsampled reconstruction value as the predicted value of the target block.

When the size range of the target block of the second hierarchy capable of using the information of the first hierarchy is an allowable range (for example, 64x64 to 8x8) defined by the encoding apparatus, Intra BL prediction can be performed on the size (64x64 ~ 8x8).

Alternatively, when the size range of the target block of the second layer, which can use the information of the first layer, is limited to a specific size such as 64x64, or the encoding device has a size of 64x64, Only for blocks, intra BL prediction can be performed.

Alternatively, when the size range of the target block of the second layer that can use the information of the first layer is, for example, 32x32 or less, or is determined to be a specific range such as 8x8 or more, The intra BL prediction can be performed only when it is included in the determined block size range.

As another example, when the determined block size range is 16x16 or less, the encoding apparatus can perform intra BL prediction on the target block only when the size of the target block of the second layer is smaller than or equal to 16x16.

Alternatively, when the size range of the target block of the second hierarchy that can use the information of the first hierarchy is determined to be the minimum block size allowable by the encoding apparatus, the encoding apparatus determines that the size of the target block of the second hierarchy is the minimum block size Lt; RTI ID = 0.0 > BL < / RTI > prediction.

Alternatively, when the size range of the target block of the second hierarchy that can use the information of the first hierarchy is determined to be the maximum block size allowable by the encoding apparatus, the encoding apparatus determines that the size of the target block of the second hierarchy is the maximum block size Lt; RTI ID = 0.0 > BL < / RTI > prediction.

According to another embodiment, the encoding apparatus may perform Intra BL skip prediction in which the decoded block signal of the first layer is used as a prediction signal having no difference signal of the second layer target block. According to the intra BL skip prediction, the reconstructed value of the reference block in the first layer is upsampled, and the upsampled reconstruction value can be used as the reconstruction value of the target block.

When the size range of the target block of the second hierarchy capable of using the information of the first hierarchy is an allowable range (for example, 64x64 to 8x8) defined by the encoding apparatus, It is possible to perform intra BL skip prediction on the size (64x64 to 8x8).

Alternatively, when the size range of the target block of the second layer, which can use the information of the first layer, is limited to a specific size such as 64x64, or the encoding device has a size of 64x64, It is possible to perform the intra BL skip prediction only for the block.

Alternatively, when the size range of the target block of the second layer that can use the information of the first layer is, for example, 32x32 or less, or is determined to be a specific range such as 8x8 or more, It is possible to perform the intra BL skip prediction only when it is included in the determined block size range.

As another example, when the determined block size range is 16x16 or less, the encoding apparatus can perform the intra BL skip prediction on the target block only when the size of the target block of the second hierarchy is smaller than or equal to 16x16.

Alternatively, when the size range of the target block of the second hierarchy that can use the information of the first hierarchy is determined to be the minimum block size allowable by the encoding apparatus, the encoding apparatus determines that the size of the target block of the second hierarchy is the minimum block size It is possible to perform the intra BL skip prediction only.

Alternatively, when the size range of the target block of the second hierarchy that can use the information of the first hierarchy is determined to be the maximum block size allowable by the encoding apparatus, the encoding apparatus determines that the size of the target block of the second hierarchy is the maximum block size It is possible to perform the intra BL skip prediction only.

In performing the intra BL prediction or the intra BL skip prediction on the target block, the encoding device may set the same range of the size of the target block of the second layer that can use the information of the first layer, have.

The encoding apparatus may signal size information using one syntax element if the sizes of the target blocks of the second layer that can use the information of the first layer to which the intra BL prediction and the intra BL skip prediction can be applied are the same.

On the other hand, intra BL prediction is performed only in all block sizes irrespective of the size of the target block in the second layer and in the case of intra BL skip prediction, The size range of the target block of the layer may be different from each other in the intra BL prediction and the intra BL skip prediction. In this case, the size information of the target block to which prediction is applied may be signaled with different syntax elements.

On the other hand, if the size of the target block does not fall within the determined block size range or if the target block is not predicted by inter-layer prediction, the encoding apparatus uses the decoded neighboring block of the second layer decoded image or the target block Normal inter-picture prediction or intra-picture prediction can be performed.

As described above, when it is determined whether to use the decoded block signal of the first layer corresponding to the size of the target block, the encoder can encode an indicator indicating whether to perform inter-layer prediction for each target block and transmit the encoded indicator to the decoding apparatus .

For example, when the decoded block signal of the first layer can be used as a prediction signal having a difference signal, that is, when intra BL prediction can be applied to a target block, the coding apparatus encodes a flag such as intra_bl_flag, And informs the decryption apparatus whether or not it is applied.

Alternatively, when the decoded block signal of the first layer can be used as a prediction signal without a difference signal, that is, when intra BL skip prediction can be applied to a target block, the coding apparatus encodes a flag such as intra_bl_skip_flag, And information on whether or not it is applicable can be transmitted to the decryption apparatus.

The encoding apparatus performs transcoding on the differential signal of the predicted target block (S540).

When the intra BL prediction is performed on the target block, the encoder generates a difference signal between the original image signal of the target block of the second hierarchy and the decoded first layer of the block signal, and then performs the transform coding on the difference signal .

The encoding apparatus may perform transcoding according to the transform depth information (max_transform_hierarchy_depth_inter) defined for inter-picture prediction when performing the transform coding on the differential signal of the object block to which the inter-picture prediction is applied.

The encoding apparatus may perform transcoding according to the transformed depth information (max_transform_hierarchy_depth_intra) defined for intra-picture prediction when performing a transcoding on a differential signal of a target block to which intra-picture prediction is applied.

On the other hand, when performing the change coding on the differential signal of the target block to which the intra BL prediction is applied, the encoding apparatus converts the conversion depth information (max_transform_hierarchy_depth_inter) defined for inter-picture prediction, the conversion depth information (max_transform_hierarchy_depth_intra) which is not conversion depth information (max_transform_hierarchy_depth_intra) defined for inter-picture prediction and max_transform_hierarchy_depth_intra (max_transform_hierarchy_depth_intra) defined for intra-picture prediction, and conversion depth information Can be performed.

The third conversion depth information (max_transform_hierarchy_depth_intrabl) can be encoded into a difference value (delta) from the in-picture or inter-picture conversion depth information.

The conversion depth information defined for inter-picture prediction, the conversion depth information defined for intra-picture prediction, and the third conversion depth information can be defined and signaled in SPS (Sequence Parameter Sets).

On the other hand, when the target block of the second hierarchy is a block to which no differential signal is predicted, i.e., intra BL skip prediction is applied, the encoding apparatus can omit the transcoding step and the quantization step.

6 is a control flowchart for explaining a method of decoding a second layer with reference to a first layer in a decoding apparatus according to the present invention.

First, the decoding apparatus decodes the first layer block referred to by the target block in the second layer (S610).

The first layer block referenced by the target block in the second layer may be decoded according to a coding scheme of a reference layer that can be transmitted in a VPS (Video Parameter Set), SPS (Sequence Parameter Set), or the like.

For example, if the reference layer is coded in the MPEG-2 scheme, the decoding apparatus can decode the first layer block according to the MPEG-2 scheme.

Alternatively, when the reference layer is coded by the H.264 / AVC scheme, the decoding apparatus may decode the first layer block according to the H.264 / AVC scheme.

Alternatively, when the reference layer is coded by the HEVC scheme, the decoding apparatus may perform decoding of the first layer block according to the HEVC scheme.

The first layer and the second layer may be processed in separate decoders, and the first layer may be predicted and restored before the second layer.

The decoded first layer may be stored in a memory such as a DPB (Decoded Picture Buffer). The stored first layer may be deleted from the memory after being referred to by the second layer, or may be stored in the memory for a preset time.

When the block of the first hierarchy is decoded, the decoding apparatus can determine the size range of the target block of the second hierarchy that can use the information of the first hierarchy (S620).

Various methods can be applied to a method for the decoding apparatus to determine the size range of the target block.

According to an embodiment of the present invention, the decoding apparatus can determine the size range of the second hierarchical object block so that the information of the first hierarchical layer can be used for all allowable block sizes.

For example, when the size range of the preset allowable block is 64x64 to 8x8, the decoding apparatus can determine the size range of the target block that can use the decoded block signal of the first hierarchy as 64x64 to 8x8.

Alternatively, when the size range of the preset allowable block is 64x64 to 16x16, the decoding apparatus can determine the size range of the target block in which the decoded block signal of the first hierarchy is available to be 64x64 to 16x16.

Alternatively, the decoding apparatus may determine the size range of the second hierarchical object block so that information of the first hierarchical layer can be used for all allowable block sizes defined by the encoding apparatus.

According to another embodiment of the present invention, the decoding apparatus can determine the size range of the second layer target block that can use the information of the first layer according to the implicit rule between the encoding apparatuses.

For example, the decoding apparatus can limit the size range of the target block that can use the information of the first layer to one size such as 64x64 or 8x8 according to an implicit rule between the encoding apparatuses.

Alternatively, the decoding apparatus may determine the range of the size of the target block in which the information of the first layer can be used as the range of the maximum and minimum values such as 8x8 or more and 32x32 or less, 16x16 or 16x16 or more.

Alternatively, the decoding apparatus may determine a size range of a target block that can use information of the first layer to be a maximum block size allowed by the encoding apparatus, or a minimum block size allowed by the encoding apparatus.

Alternatively, the decoding apparatus may set various size ranges in addition to the size or size range of the target block described above according to an implicit rule with the encoding apparatus.

The encoding apparatus can signal the size range of the target block that can use the decoded block signal of the first layer through a separate indicator, and the decoding apparatus parses the information to be transmitted from the encoding apparatus, The range can be determined.

The decoding apparatus parses the information for determining the minimum size of the block and the maximum size information of the block included in the sequence parameter sets (SPS), the picture parameter sets (PPS), the slice header, The size range of the target block that can use the decoded block signal can be determined.

For example, the minimum or maximum size information of the target block that can use the decoded block signal of the first layer may be signaled using syntax elements such as log2_min_luma_intrabl_size_minus3, log2_max_luma_intrabl_size_minus3, log2_max_luma_intrablskip_size_minus3, log2_max_luma_intrablskip_size_minus3.

Or the maximum size information of the target block of the second layer that can use the information of the first layer may be expressed as a difference value with respect to the minimum block size and signaled.

For example, the decoding apparatus can parse a syntax element such as log2_diff_max_min_luma_intrabl_size, log2_diff_max_min_luma_intrablskip_size, and use the minimum block size plus a value as the maximum size information of the target block.

As another example, the encoding apparatus may represent the maximum and minimum size information of the allowable blocks by a difference value (delta) between the minimum size and maximum size information (for example, log2_min_luma_coding_block_size_minus3 or log2_diff_max_min_luma_coding_block_size) defined in the SPS, You may. In this case, the decoding device parses the difference value, adds the difference value to the minimum size and the maximum size defined in the encoding device, and sets the maximum block size or the minimum size of the target block of the second layer, The block size can be determined.

As described above, in performing inter-layer texture prediction, the decoding apparatus according to the present invention performs inter-layer texture prediction only when the size of a block to be decoded in the second layer falls within a specific range, .

Next, the decoding apparatus predicts the target block of the second hierarchy (S630). If the target block to be decoded corresponds to a block size range determined to be able to use the decoded block signal of the first layer in step S620, the decoding apparatus parses intra_bl_flag or intra_bl_skip_flag to decode the decoded block signal of the first layer The intra BL prediction or the intra BL skip prediction to be used can be performed.

The decoding apparatus parses the intra-layer prediction indicator (intra_bl_flag) when the target block has a size that allows intra-BL prediction, and if the flag has a value of 1, decodes the first- It is possible to perform intra BL prediction using the prediction signal having the differential signal of the block. That is, the decoding apparatus can upsample the reconstructed value of the reference block in the first layer and use the upsampled reconstruction value as the predicted value of the target block having the differential signal.

When the size range of the target block of the second hierarchy capable of using the information of the first hierarchy is an allowable range defined by the encoding apparatus (for example, 64x64 to 8x8), the decoding apparatus determines that all the target blocks of the second hierarchy The intra_bl_flag can be parsed for the size (64x64 ~ 8x8). If intra_bl_flag is 1, the decoding apparatus can use the decoded block signal of the first layer as a prediction signal according to the intra BL prediction for the block.

Alternatively, if the size range of the target block of the second hierarchy that can use the information of the first hierarchy is limited to a specific size such as 64x64, or the decoding apparatus has a size of 64x64 as the case of the target block of the second hierarchy, For the block, intra_bl_flag can be parsed. If intra_bl_flag is 1, the decoding apparatus can use the decoded block signal of the first layer as a prediction signal for the block.

Alternatively, the decoding apparatus can parse the intra_bl_flag when the size range of the target block of the second hierarchy that can use the information of the first hierarchy is, for example, 32x32 or less, or is determined to be a specific range such as 8x8 or more. The decoding apparatus can use the decoded block signal of the first layer as a prediction signal for the block only when intra_bl_flag is 1.

As another example, when the determined block size range is 16x16 or less, the decoding apparatus can parse the intra_bl_flag only when the size of the target block of the second hierarchy is smaller than or equal to 16x16. The decoding apparatus can use the decoded block signal of the first layer as a prediction signal for a block whose size is smaller than or equal to 16x16 only when intra_bl_flag is 1.

Alternatively, when the size range of the target block of the second hierarchy that can use the information of the first hierarchy is determined to be the minimum block size allowable by the encoding apparatus, the decoding apparatus determines that the size of the target block of the second hierarchy is the minimum block size The intra_bl_flag can be parsed. If intra_bl_flag is 1, the decoding apparatus can use the decoded block signal of the first layer as a prediction signal for a target block having a minimum block size.

Alternatively, if the size range of the target block of the second layer that can use the information of the first layer is determined to be the maximum block size allowable by the encoding apparatus, the decoding apparatus can parse the intra_bl_flag. If intra_bl_flag is 1, the decoding apparatus can use the decoded block signal of the first layer as a prediction signal for a target block having the maximum block size.

According to another embodiment, the decoding apparatus may perform Intra BL skip prediction in which the decoded block signal of the first hierarchy is used as a prediction signal having no difference signal of the second hierarchical object block. According to the intra BL skip prediction, the reconstructed value of the reference block in the first layer is upsampled, and the upsampled reconstruction value can be used as the reconstruction value of the target block.

The decoding apparatus parses the intra-layer prediction indicator (for example, intra_bl_skip_flag) when the target block has a block size allowing the intra BL skip prediction, and then parses the decoded block signal of the first hierarchy It can be used as a prediction signal.

When the size range of the target block of the second hierarchy capable of using the information of the first hierarchy is an allowable range defined by the encoding apparatus (for example, 64x64 to 8x8), the decoding apparatus determines that all the target blocks of the second hierarchy The intra_bl_skip_flag can be parsed for the size (64x64 ~ 8x8). If the intra_bl_skip_flag is 1, the decoding apparatus can use the decoded block signal of the first hierarchy as a prediction signal having no differential signal according to the intra BL skip prediction for the block.

Alternatively, if the size range of the target block of the second hierarchy that can use the information of the first hierarchy is limited to a specific size such as 64x64, or the decoding apparatus has a size of 64x64 as the case of the target block of the second hierarchy, Only intra_bl_skip_flag can be parsed for blocks. If the intra_bl_skip_flag is 1, the decoding apparatus can use the decoded block signal of the first layer for a target block having a size of 64x64 as a prediction signal having no differential signal.

Alternatively, when the size range of the target block of the second hierarchy, which can use the information of the first hierarchy, is determined to be a specific range, for example, 32x32 or less or 8x8 or more, The intra_bl_skip_flag can be parsed only when it is included in the determined block size range. only when the intra_bl_skip_flag is 1, the decoding apparatus can use the decoded block signal of the first hierarchy as a prediction signal having no differential signal for a target block having a size of 32x32 or less or a size of 8x8 or more.

As another example, when the determined block size range is 16x16 or less, the decoding apparatus can parse the intra_bl_skip_flag only when the size of the target block of the second hierarchy is smaller than or equal to 16x16. When the intra_bl_skip_flag is 1, the decoding apparatus can use the decoded block signal of the first layer as a prediction signal having no differential signal for a target block having a size of 16x16 or less.

Alternatively, when the size range of the target block of the second hierarchy that can use the information of the first hierarchy is determined to be the minimum block size allowable by the encoding apparatus, the decoding apparatus determines that the size of the target block of the second hierarchy is the minimum block size Only intra_bl_skip_flag can be parsed. When intra_bl_skip_flag is 1, the decoding apparatus can use the decoded block signal of the first hierarchical level as a prediction signal having no differential signal for the object block having the minimum block size.

Alternatively, when the size range of the target block of the second hierarchy that can use the information of the first hierarchy is determined to be the maximum block size allowable by the encoding apparatus, the encoding apparatus determines that the size of the target block of the second hierarchy is the maximum block size Only intra_bl_skip_flag can be parsed. When intra_bl_skip_flag is 1, the decoding apparatus can use the decoded block signal of the first hierarchical level as a prediction signal having no difference signal for the object block having the maximum block size.

In performing the intra BL prediction and the intra BL skip prediction, the ranges of allowable target block sizes may be different from each other, and the decoding apparatus may adaptively parse intra_bl_flag or intra_bl_skip_flag.

For example, it can be determined that intra BL prediction is performed in all block sizes irrespective of the size of a target block in the second layer, and only in case of intra BL skip prediction, 32 × 32 or less. If the size of the current block to be decoded is 64x64, intra_bl_flag may be parsed, and intra_bl_skip_flag may not be parsed because signaling is not performed by the encoder.

On the other hand, if the size of the target block does not belong to the determined block size range or if the target block is not predicted by inter-layer prediction, the decoding apparatus uses the decoded neighboring block of the second layer decoded image or the target block Normal inter-picture prediction or intra-picture prediction can be performed.

When prediction of the target block is completed, the decoding apparatus performs conversion decoding on the difference signal (S640).

In the prediction in step S630, when the target block of the second hierarchy is determined as a prediction with a differential signal, i.e., an intra BL prediction block, the decoding apparatus can perform inverse transform decoding on the second layer differential signal transmitted from the coding apparatus have.

In performing the inverse change decoding, the decoding apparatus can perform inverse transform decoding according to the transformed depth information (max_transform_hierarchy_depth_inter) defined for inter-picture prediction.

Alternatively, in performing the inverse transform decoding, the decoding apparatus may perform inverse transform decoding according to the transformed depth information (max_transform_hierarchy_depth_intra) defined for intra prediction.

The decoding apparatus according to another embodiment performs inverse transform decoding on the basis of transformed depth information (max_transform_hierarchy_depth_inter) defined for inter-picture prediction and transformed depth information (max_transform_hierarchy_depth_intra) defined for on- (max_transform_hierarchy_depth_intrabl). The third conversion depth information may be expressed by a sum of in-picture or inter-picture conversion depth information and a difference value (delta value) transmitted from the encoding apparatus.

The conversion depth information defined for the inter picture prediction for the inverse conversion decoding of the difference signal, the conversion depth information defined for the intra picture prediction, and the third conversion depth information can be defined in Sequence Parameter Sets (SPS).

On the other hand, when the two-level target block is determined as a prediction without difference signal, that is, an intra BL skip prediction block in S630, the inverse transform decoding step and the inverse quantization step may be omitted.

The present invention relates to an image decoding and decoding method including a plurality of layers or viewpoints, wherein the plurality of layers can be expressed as a first layer, a second layer, a third layer, or a view. In the above description, an image having the first layer and the second layer is described as an example. However, even when the bitstream includes three or more layers, the same method of inter-layer prediction described above can be applied.

In the above-described embodiments, the methods are described on the basis of a flowchart as a series of steps or blocks, but the present invention is not limited to the order of the steps, and some steps may occur in different orders or in a different order than the steps described above have. It will also be understood by those skilled in the art that the steps depicted in the flowchart illustrations are not exclusive, that other steps may be included, or that one or more steps in the flowchart may be deleted without affecting the scope of the present invention. You will understand.

The above-described embodiments include examples of various aspects. While it is not possible to describe every possible combination for expressing various aspects, one of ordinary skill in the art will recognize that other combinations are possible. Accordingly, it is intended that the invention include all alternatives, modifications and variations that fall within the scope of the following claims.

100: image encoding device 111: motion prediction unit
112: motion compensation unit 120: intra prediction unit
115: Switch 125:
130: conversion unit 140: quantization unit
150: an entropy encoding unit 160: an inverse quantization unit
170: inverting section 180: filter section

Claims (20)

A method of decoding an image supporting a plurality of layers,
Decoding a first layer referenced by a target block of a second hierarchy to be decoded;
Determining a size of the target block of the second layer that can utilize the information of the first layer;
And performing prediction on the target block using the information of the first layer according to the determined result. The method according to claim 1,
Wherein the step of determining the size of the target block comprises:
Wherein all the allowable block sizes defined in the encoding apparatus are determined as the sizes of the target blocks. The method according to claim 1,
Wherein the step of determining the size of the target block comprises:
Wherein a block size set by an implicitly predetermined rule with the encoding apparatus is determined as the size of the target block. The method according to claim 1,
Wherein the step of determining the size of the target block comprises:
Wherein the maximum block size allowed by the encoding device is determined as the size of the target block. The method according to claim 1,
Wherein the step of determining the size of the target block comprises:
Wherein the minimum block size allowed by the encoding apparatus is determined as the size of the target block. The method according to claim 1,
Wherein the step of determining the size of the target block comprises:
Parsing the size range indicator sent from the encoding device,
Wherein the size range indicator includes any one of a maximum size range syntax element and a minimum size range syntax element that are transmitted in one of SPS, PPS, and slice header. The method according to claim 1,
Wherein the step of determining the size of the target block comprises:
Parsing a maximum size range syntax element of a target block represented by an indicator of a minimum block size allowed by the encoding device and a difference between the minimum block size and the minimum block size,
Wherein the maximum block size of the target block is determined as a minimum block size by the indicator and a sum of the difference values. The method according to claim 1,
Wherein the step of determining the size of the target block comprises:
And parsing a syntax element expressed by a difference between a minimum block size and a maximum block size allowed by the encoding device, which is transmitted from the encoding device. The method according to claim 1,
Wherein the step of performing prediction on the target block comprises:
Parsing flag information indicating use of the first layer when intra BL prediction is applied to the target block;
And using the decoded block signal of the first layer as a prediction signal having a difference signal if the flag information is 1. The method according to claim 1,
Wherein the step of performing prediction on the target block comprises:
Parsing flag information indicating use of the first layer when the intra BL skip prediction is applied to the target block;
And using the decoded block signal of the first layer as a prediction signal having no difference signal if the flag information is 1. An apparatus for decoding an image supporting a plurality of layers,
A first layer decoding unit for decoding a first layer referenced by a target block of a second layer to be decoded;
A second layer decoding unit for determining a size of the target block in the second layer capable of using the information in the first layer and performing prediction on the target block using the information in the first layer according to the determined result, And an image decoding unit for decoding the image data. 12. The method of claim 11,
Wherein the second layer decoding unit determines all allowable block sizes defined in the encoder as the size of the target block. 12. The method of claim 11,
Wherein the second layer decoding unit determines a block size set by a predetermined rule set implicitly with the encoding apparatus to be the size of the target block. 12. The method of claim 11,
Wherein the second layer decoding unit determines a maximum block size allowed by the encoding apparatus as a size of the target block. 12. The method of claim 11,
Wherein the second layer decoding unit determines the minimum block size allowed by the encoding unit as the size of the target block. 12. The method of claim 11,
The second layer decoding unit parses the size range indicator transmitted from the encoder,
Wherein the size range indicator includes any one of a maximum size range syntax element and a minimum size range syntax element to be transmitted in one of SPS, PPS, and slice header. 12. The method of claim 11,
Wherein the second layer decoding unit parses a maximum size range syntax element of a target block represented by an indicator of a minimum block size allowed by the encoding apparatus and a difference between the minimum block size and a minimum block size,
Wherein the maximum block size of the target block is determined as a minimum block size by the indicator and a sum of the difference values. 12. The method of claim 11,
Wherein the second layer decoding unit parses a syntax element expressed by a difference between a minimum block size and a maximum block size allowed by the encoding apparatus, which is transmitted from the encoding apparatus. 12. The method of claim 11,
The second layer decoding unit parses flag information indicating that the first layer is used when the intra BL prediction is applied to the target block, and outputs the decoded block signal of the first layer as a difference signal As a prediction signal having a predetermined number of pixels. 12. The method of claim 11,
Wherein the second layer decoding unit parses flag information indicating that the first layer is used when intra BL skip prediction is applied to the target block, and if the flag information is 1, Wherein the predictive signal is used as a prediction signal having no signal.


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WO2019017673A1 (en) * 2017-07-19 2019-01-24 삼성전자 주식회사 Encoding method and apparatus therefor, decoding method and apparatus therefor
US11356664B2 (en) 2016-06-01 2022-06-07 Samsung Electronics Co., Ltd. Methods and apparatuses for encoding and decoding video according to coding order

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US11356664B2 (en) 2016-06-01 2022-06-07 Samsung Electronics Co., Ltd. Methods and apparatuses for encoding and decoding video according to coding order
US11477451B2 (en) 2016-06-01 2022-10-18 Samsung Electronics Co., Ltd. Methods and apparatuses for encoding and decoding video according to coding order
US11622110B2 (en) 2016-06-01 2023-04-04 Samsung Electronics Co., Ltd. Methods and apparatuses for encoding and decoding video according to coding order
WO2019017673A1 (en) * 2017-07-19 2019-01-24 삼성전자 주식회사 Encoding method and apparatus therefor, decoding method and apparatus therefor
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