KR102501051B1 - Apparatus and method for motion prediction of multi view or multi layer video - Google Patents

Abstract

The present invention relates to encoding of a multi-view or multi-layered image, and in the encoding step of a multi-view or multi-layered image, motion prediction is performed within a conventional spatial or temporal picture to motion information of a corresponding picture of another view or other component. There is an advantage in that the efficiency of motion prediction encoding can be increased by using the method.

Description

Apparatus and method for predicting motion information in multi-view screen or inter-layer prediction

The present invention relates to encoding/decoding of multi-view or multi-layer images, and more particularly, to motion information prediction technology using characteristics of multi-view or multi-layer images.

Recently, as the size and resolution of displays increase, the amount of video data is gradually increasing. In addition, with the advent of new video formats that pursue immersive video that cannot be covered by conventional 2D video, such as 3D video or multi-view video, the amount of transmitted video data is increasing tremendously.

If such large-capacity video data is transmitted or stored as it is, it becomes difficult to bear the transmission cost or storage cost. Therefore, large-capacity video compression coding technology is essential.

There are several video compression coding technologies. Among them, motion prediction is a method of dividing a screen into several blocks and predicting which block of a previous frame has moved to a block of a current frame. The amount of transmitted data can be reduced because only the motion vector needs to be transmitted by predicting the motion of the block.

Conventional video codecs such as HEVE (High Efficiency Video Coding) or VVC (Versatile Video Coding) use a merge mode or an advanced motion vector prediction (AMVP) mode as a motion vector prediction method.

This is a candidate for motion vector prediction using candidates derived from neighboring blocks existing in the same frame as the current prediction block (PU: Prediction Unit, or CU: Coding Unit) and blocks at the same position as the current prediction block in the reference frame. Blocks are selected and motion is predicted from them.

However, in the case of 3D video or multi-view video, motion prediction can be more accurately performed by using frames of other views in addition to spatial and temporal candidates as in the prior art, but no such attempt has been made yet.

The inventors of the present invention have made efforts to solve the motion prediction problem of multi-view or multi-layer video of the prior art. The present invention has been completed after much effort to complete an apparatus and method for predicting motion using frames of different views or components of multi-view or multi-layer video.

An object of the present invention is to improve the efficiency of video encoding by using motion information of different viewpoints or other elements in a multi-view or multi-layer image.

Meanwhile, other unspecified objects of the present invention will be additionally considered within the scope that can be easily inferred from the following detailed description and effects thereof.

The motion prediction device according to the present invention,

a motion vector candidate generation unit that generates a motion vector prediction candidate list using blocks of different viewpoints or other components that have been coded; and a motion vector predictor generating motion vector prediction information of a current block using the motion vector prediction candidate list.

The motion vector candidate generation unit may generate the motion vector prediction candidate list using a block located at the same position as the current block among blocks of another time point at which the encoding is completed or of other components.

The motion vector candidate generating unit is a block located at the same position as the current block among blocks of the lower left block, the upper left block, the upper right block, the upper block, the upper left block of the current block, another time point at which the encoding is completed, or other component blocks. , The motion vector prediction candidate list is generated in the order of blocks located at the same position as the current block in the reference frame.

The motion vector candidate generation unit, if the block at the same position as the current block among the blocks at another point in time when the encoding is completed or at the same position as the current block does not have motion information, the upper block or the upper left block of the block located at the same position as the current block , the motion vector prediction candidate list is generated by checking the motion information in the order of the left block.

The motion vector candidate generation unit generates one of a lower left block and a left block of the current block and one of an upper right block, an upper block and an upper left block of the current block as the motion vector prediction candidate list, If the motion information of the blocks added to the candidate list is duplicated, the duplicated blocks are removed, and a block at the same position as the current block among blocks of another time when the encoding is completed or of another component is added to the motion vector prediction candidate list. It is characterized by doing.

The motion vector candidate generation unit, if the motion information of the block located at the same position as the current block is equal to the motion information of a block already added to the motion vector prediction candidate list, motion consisting of 0 instead of the block located at the same position as the current block A vector candidate is added to the motion vector prediction candidate list.

The motion vector candidate generator generates subblocks of a coding unit at a position corresponding to the current coding unit (CU) of a current picture to which the current block belongs, or a picture of another view corresponding to the current coding unit to which the current block belongs or a picture of another component. It is characterized in that the motion vector prediction candidate list is generated by combination.

The motion vector candidate generator may determine the size of the subblock as a result of a bit operation that shifts the size of the current coding unit to the right by two bits.

The motion vector candidate generator may fix the size of the subblock to 8x8 when the result value of the bit operation is smaller than 8x8.

The motion vector candidate generator generates CPMV of the current CU when a block at the same position as the current block among blocks of another time point at which the coding is completed or of another component is coded by an affine-based motion prediction technique Control Point Motion Vector).

The motion vector candidate generation unit performs a combination affine merge by using a block at the same position as the current block among blocks of another time point at which the encoding is completed or of other components as a control point motion vector (CPMV). It is characterized by generating an Affine Merge) candidate.

A motion prediction method according to another embodiment of the present invention,

generating a motion vector prediction candidate list by using a block of another point in time or another component of which encoding is completed; and generating motion vector prediction information of the current block by using the motion vector prediction candidate list.

According to the present invention, the efficiency of motion prediction encoding can be improved by using motion information of a corresponding picture of another viewpoint or other component.

On the other hand, even if the effects are not explicitly mentioned here, it is added that the effects described in the following specification expected by the technical features of the present invention and their provisional effects are treated as described in the specification of the present invention.

1 is a schematic structural diagram of a motion estimation device according to a preferred embodiment of the present invention.
2 shows an example of neighboring blocks used for motion prediction.
3 shows an example of a subblock-based merge mode.
4 shows an example of an affine merge mode.
5 shows an example of a picture configuration of a 3D image.
6 shows an example of referring to an image of another viewpoint in a 3D image.
7 shows an example of constructing a motion vector prediction candidate list in a 3D image.
8 shows an example of a subblock-based merge mode.
9 is a schematic flowchart of a motion prediction method according to a preferred embodiment of the present invention.
10 is a schematic structural diagram of a motion estimation apparatus of a video decoder according to another preferred embodiment of the present invention.
11 is a schematic flowchart of a motion estimation method of a video decoder according to another preferred embodiment of the present invention.
※ It is revealed that the accompanying drawings are exemplified as references for understanding the technical idea of the present invention, and thereby the scope of the present invention is not limited.

Hereinafter, with reference to the drawings, look at the configuration of the present invention guided by various embodiments of the present invention and the effects resulting from the configuration. In the description of the present invention, if it is determined that a related known function may unnecessarily obscure the subject matter of the present invention as an obvious matter to those skilled in the art, the detailed description thereof will be omitted.

Terms such as 'first' and 'second' may be used to describe various elements, but the elements should not be limited by the above terms. The above terms may only be used for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a 'first element' may be named a 'second element', and similarly, a 'second element' may also be named a 'first element'. can Also, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms used in the embodiments of the present invention may be interpreted as meanings commonly known to those skilled in the art unless otherwise defined.

Hereinafter, with reference to the drawings, look at the configuration of the present invention guided by various embodiments of the present invention and the effects resulting from the configuration.

Hereinafter, a video codec for video encoding/decoding will be described based on ISO/IEC MPEG-I versatile video coding (VVC), but the present invention is not limited thereto and can be applied to all other video codecs as a matter of course.

1 is a schematic structural diagram of a motion estimation device according to a preferred embodiment of the present invention.

The motion estimation apparatus 100 according to the present invention is included in the video encoder 1 and includes a motion vector candidate generator 110 and a motion vector predictor 120 . Also, the motion estimation apparatus 100 includes one or more processors and memory (not shown). The processor is used to predict motion and generate motion information, and program codes and data for driving the processor may be stored in a memory.

The motion vector candidate generator 110 generates a list of candidate blocks for motion prediction by using neighboring information of a current block being encoded.

2 shows an example of neighboring blocks used for motion prediction.

In the merge mode, a candidate list for using motion information is configured. In FIG. 2 , blocks spatially and temporally related to the current prediction unit 10 (PU: Prediction Unit) are used as candidate blocks for motion prediction.

A0, A1, B0, B1, and B2 are neighboring blocks that exist in the same frame as the current prediction unit 10 and have been coded, and are spatial candidates.

C0 and C1 are blocks in a frame different from the current prediction unit 10, that is, a reference frame, and are temporal candidates derived from a prediction unit at the same location as the current prediction unit.

The motion vector candidate generator 110 constructs a candidate list from these spatial and temporal candidates. The merge mode motion vector prediction candidate list can be generated in the order of A0→A1→B0→B1→B2→C0→C1. The merge mode list may have up to five candidates, and blocks having the same information may be excluded from the candidates. As a block having the same information is excluded, if all five candidates are not filled, the remaining list can be filled with virtual candidates. Virtual candidates may include history-based motion vector prediction (HMVP), pairwise average motion vector prediction (PAMVP), and zero candidates.

Another method of generating a motion candidate may be a subblock-based merging mode.

3 shows an example of a subblock-based merge mode.

The subblock-based merging mode divides a Coding Unit (CU) into sub Coding Units and derives a different motion vector for each sub Coding Unit to generate a prediction signal. Prediction accuracy can be improved by performing prediction by deriving a motion vector in units of small sub-coding units without dividing blocks.

The motion vector candidate generator 110 first finds a corresponding block of the current coding unit. The corresponding block of the current coding unit 22 is a block existing in a corresponding reference picture (collocated picture) 30 transmitted in the slice header, and is an A1 block located at the lower left of the current coding unit. If the reference picture of block A1 is the same as that of the corresponding reference picture 30, the motion vector of block A1' identical to the position of A1 is used. find a location

Next, a motion vector in units of sub coding units (24, 8x8 fixed units) of the current coding unit 22 is derived from the corresponding block. To this end, the current coding unit 22 is divided into 8x8 sub coding units 24, and each sub coding unit of the current block moves by using motion information corresponding to the center position of each sub coding unit 34 in the corresponding block. Vectors are derived in units of 8x8.

Finally, the motion vector derived from the corresponding block is set to a sub-block temporal MVP (SbTMVP), which is a sub-coding unit unit motion vector, through a scaling process so that it can be applied to a reference picture.

The subblock-based merge mode prediction process generates a prediction block of the current coding unit using motion information based on 8x8 blocks derived through this process. In this case, only a motion compensation process is required without a motion estimation process as in the general merge mode. Also, Motion Vector Difference (MVD) is not transmitted to the decoder.

The motion vector candidate generator 110 may generate a motion vector prediction candidate list in AMVP mode. AVMP mode can have up to two candidates.

When one candidate is selected from blocks A0 and A1 in FIG. 2 and one candidate is selected from blocks B0, B1, and B2, duplicated motion information is removed from the list through redundancy check. If the candidate list is not fully filled by removing redundant information, temporal candidates C0, C1, and HMVP candidates may be added.

The motion vector candidate generator 110 may also generate a motion vector prediction candidate list using the affine merge mode. Affine-based merge mode candidates are composed of inherited affine merge candidates and combinatorial affine merge candidates.

4 shows an example of an affine merge mode.

The inherited affine merge candidate is the current coding unit derived from the CPMV (Control Point Motion Vector) of the coding unit when the top or left neighboring coding units of the current coding unit 40 are coded by applying the affine-based motion vector prediction technique. (40) means the CPMV.

The combination affine merge candidate means the CPMV of the current coding unit 40 derived by combining neighboring motion vectors. In FIG. 4, the existence of a motion vector is checked in the order of B2 → → to set the first available motion vector as CPMV1, and then the motion vector is checked in the order of B1 → CPMV2, and the motion vector is checked in the order of A1 → to obtain CPMV3. , TMVP (C0 or C1) is set to CPMV4 respectively.

The set CPMVs are combined as follows and used as a combination affine merge candidate. The following is a 6-parameter affine merge candidate composed of three CPMVs.

{CPMV1, CPMV2, CPMV3}, {CPMV1, CPMV2, CPMV4},

{CPMV1, CPMV3, CPMV4}, {CPMV2, CPMV3, CPMV4}

The following is a 4-parameter affine merge candidate composed of two CPMVs.

{CPMV1, CPMV2}, {CPMV1, CPMV3}

Whether the encoder uses the 6-parameter affine merge candidate or the 4-parameter information is indicated by sps_affine_type_flag in the sequence parameter set (SPS) and transmitted to the decoder.

The motion vector candidate generation unit 110 can extend the above-described motion vector prediction information of a 2D screen to a 3D image or a multi-view image.

5 shows an example of a picture configuration of a 3D image.

An image V0 of a view called a base view or an independent view is independently encoded without depending on other views. Since images V1 and V2 of different views can be encoded by referring to images of other views using a 3D encoder, they are called dependent views.

The current picture is composed of several access units, and the access unit is divided into a texture (also referred to as a "first component") and a depth map (also referred to as a "second component") . That is, referring to FIG. 5 , a multi-view image may include first and second components for each view image.

The motion vector candidate generator 110 may generate motion vector prediction information of the current coding unit by using image information of different viewpoints in the 3D image.

6 shows an example of referring to an image of another viewpoint in a 3D image.

The motion vector candidate generator 110 refers to blocks of a texture picture 60 corresponding to the depth picture 50 to generate a motion vector candidate of the depth picture 50 constituting a 3D image. can do.

When the motion vector candidate generation unit 110 predicts motion information at a dependent viewpoint of the 3D image, motion information of other components may be used at another viewpoint ?C at which encoding is completed.

As in the previous examples, a candidate list can be constructed using the general merge mode and the AMVP mode even in a 3D image.

7 shows an example of constructing a motion vector prediction candidate list in a 3D image.

(b) of FIG. 7 shows a coding unit of a dependent view currently undergoing encoding, and (a) of FIG. 7 shows another view or other component at which encoding for reference to motion information has been completed.

The motion vector candidate generation unit 110 includes spatial candidates (A0, A1, B0, B1, B2) and temporal candidates (C0, C1) of the current coding unit 70 as well as blocks ( X0, X1, X2, X3) may be additionally used to generate a job information candidate list.

The motion vector candidate generator 110 may generate a candidate list in a normal merge mode. In the previous example where spatial and temporal candidates were used, by using candidate blocks from other viewpoints, the general merge mode candidate list is A0 → A1 → B0 → B1 → B2 → X0 → C0 (C1 if → C0 is not available) can be checked in order of Among them, non-overlapping candidates are inserted into the general merge candidate list.

If X0 does not have motion information, that is, if it is coded in the intra-screen mode, blocks close to the X0 block in a counterclockwise direction are identified. In other words, motion information of usable blocks is checked by checking the motion information in the order of X1 → X2 → X3.

The motion vector candidate generator 110 may generate a candidate list in AMVP mode. In (b) of FIG. 7, one candidate from A0→ and one candidate from B0→→ are selected to generate two candidates as a candidate list. At this time, duplicated motion information is removed from the list through the redundancy check, and if the candidate list is not completely filled by the duplicate removal, a candidate having motion information among X0, X1, X2, and X3 in FIG. added to the list Here, of course, redundant information is checked and removed. Even after this process, if the number of existing candidates is less than 2, zero candidates are added to the candidate set.

The motion vector candidate generator 110 may generate a candidate list in a subblock-based merge mode. 8 shows an example of a subblock-based merge mode.

In a multi-view screen including a 3D video and inter-layer prediction, information of other views or other component pictures corresponding to the current picture may be checked in addition to the corresponding reference picture of the current picture.

Therefore, the motion vector candidate generation unit 110 of the present invention replaces the temporal reference picture with another viewpoint corresponding to the current picture (FIG. 8(a)) or a picture of another component (FIG. 8(b)). A picture of a viewpoint or other component may be used.

The corresponding block of the current coding unit 91 is a block corresponding to the block 92 located at (posX, posY) of the upper left of the current coding unit 91 in another viewpoint corresponding to the current picture or a picture of another component. (94).

At this time, the size of the sub coding unit may be determined variably according to the following equation according to the size of the current coding unit 91, rather than being fixed to an 8x8 size.

size_of_sub_CU = size_of_current_CU >> 2

size_of_sub_CU is the size of the sub coding unit and size_of_current_CU is the size of the current coding unit 91. When size_of_sub_CU becomes smaller than 8x8 by bit operation, it may be fixed to 8x8 size.

The motion vector candidate generator 110 may also perform affine-based merge motion prediction by referring to pictures of other viewpoints or other components.

In (a) of FIG. 7, when blocks X0, X1, X2, and X3 are coded with the affine-based motion prediction technique, the blocks can be used as the CPMV of the current coding unit.

For example, if X0 is set to CPMV5, a combination of 6-parameter affine merge candidates can be configured as follows.

{CPMV1, CPMV2, CPMV3}, {CPMV1, CPMV2, CPMV5 },

{CPMV1, CPMV3, CPMV5 }, {CPMV2, CPMV3, CPMV5 }

The motion vector predictor 120 predicts the motion of the current coding unit using the motion vector predictor candidate list generated by the motion vector candidate generator 110 and performs encoding.

9 is a schematic flowchart of a motion prediction method according to another preferred embodiment of the present invention.

The motion prediction method of the present invention may use information of different viewpoints or other elements in a multi-view or multi-layer image such as a 3D image.

First, among blocks of different views or other components, a block on which encoding has been completed may be generated as a motion vector prediction candidate list (S110). A general merge mode and an AMVP mode may be used to generate a motion candidate list. It is also possible to use a subblock-based merging mode. The detailed method of each mode is as described above.

After generating a motion vector prediction candidate list, encoding for motion prediction is performed using the candidate list (S120).

10 is a schematic structural diagram of a motion estimation device in a video decoder according to another preferred embodiment of the present invention.

The motion estimation apparatus 2 of the present invention is composed of a motion vector candidate generation unit 210 and a motion vector application unit 220.

The motion vector candidate generator 210 generates motion vectors of decoded blocks among blocks of different views or other components as a motion vector prediction candidate list. A general merge mode and an AMVP mode may be used to generate a motion vector candidate list. It is also possible to use a subblock-based merging mode. The detailed method of each mode is as described above.

The motion vector applicator 220 uses a motion vector corresponding to a motion vector candidate index received from the encoder from among the previously generated motion vector candidate list and applies it to decoding of a 3D image.

11 is a flowchart of a motion prediction method in a video decoder according to another preferred embodiment of the present invention.

First of all, a motion vector prediction candidate list is generated using motion vectors of blocks of different time points or other components that have been decoded (S210). A general merge mode and an AMVP mode may be used to generate a motion vector candidate list. It is also possible to use a subblock-based merging mode.

When the motion vector prediction candidate list is completed, decoding is performed by applying the motion vector of the current block using the motion vector corresponding to the motion vector candidate index transmitted from the encoder (S220).

By using blocks of different views or different elements in multi-view or multi-layer images for motion prediction, the present invention has an effect of increasing the efficiency of motion prediction encoding.

The protection scope of the present invention is not limited to the description and expression of the embodiments explicitly described above. In addition, it is added once again that the scope of protection of the present invention cannot be limited due to obvious changes or substitutions in the technical field to which the present invention belongs.

Claims (14)

In the motion prediction apparatus for encoding a multi-view image implemented to include a first component that is a texture picture and a second component that is a depth picture for each view image:
a motion vector candidate generation unit generating a motion vector prediction candidate list using a block of any one of first and second elements of an encoded first view image; and
a motion vector prediction unit generating motion vector prediction information of a current block of another one of first and second components of a second view image using the motion vector prediction candidate list;
The motion vector candidate generation unit,
Spatial blocks (A0, A1, B0, B1, B2) corresponding to blocks in the current frame including the current block, and blocks in a reference frame that is another frame in the same type unit for the current frame Using the corresponding temporal blocks (C0, C1) and the blocks (X0, X1, X2, X3) in the frame including the block of any one of the components, blocks that do not overlap with each other are included. Create a motion vector candidate list,
The current block among the lower left block (A0), the left block (A1), the upper right block (B0), the upper block (B1), the upper left block (B2), and the blocks of any one of the components of the current block generating the motion vector prediction candidate list in the order of a block (X0) located at the same position and a block (C0) located at the same position as the current block in the reference frame;
If the C0 is not available, the lower right block C1 of the C0 is used in the C0 sequence,
If the X0 does not have motion information, the motion information is checked in the order of the upper block (X1), upper left block (X2), and left block (X3) of the X0 in the order of X0 to generate the motion vector prediction candidate list Characterized in that, the motion prediction device.
delete delete delete According to claim 1,
The motion vector candidate generation unit generates the motion vector prediction candidate list to include one of the A0 and the A1 and one of the B0, the B1 and the B0, respectively, and includes blocks added to the motion vector prediction candidate list. If the motion information is duplicated, the duplicated block is removed, and a block having motion information is added to the motion vector prediction candidate list by checking the X0, the X1, the X2, and the X3 in order. Device.
According to claim 5,
The motion vector candidate generation unit, when the motion information of the X0, the X1, the X2, and the X3 is the same as the motion information of a block already included in the motion vector prediction candidate list, the motion vector candidate generation unit in the X0, the X1, the X2, and the X3. A motion vector candidate consisting of 0 is added to the motion vector prediction candidate list instead of adding .
delete delete delete delete delete A motion prediction method for encoding a multi-view image, which is performed by a controller including one or more processors and memory, and is implemented to include a first component that is a texture picture and a second component that is a depth picture for each view image. :
generating a motion vector prediction candidate list using a block of any one of first and second components of an encoded first view image; and
generating motion vector prediction information of a current block of another one of first and second components of a second view image by using the motion vector prediction candidate list;
Generating the motion vector prediction list includes:
Spatial blocks (A0, A1, B0, B1, B2) corresponding to blocks in the current frame including the current block, and blocks in a reference frame that is another frame in the same type unit for the current frame Using the corresponding temporal blocks (C0, C1) and the blocks (X0, X1, X2, X3) in the frame including the block of any one of the components, blocks that do not overlap with each other are included. Create a motion vector candidate list,
The current block among the lower left block (A0), the left block (A1), the upper right block (B0), the upper block (B1), the upper left block (B2), and the blocks of any one of the components of the current block generating the motion vector prediction candidate list in the order of a block (X0) located at the same position and a block (C0) located at the same position as the current block in the reference frame;
If the C0 is not available, the lower right block C1 of the C0 is used in the C0 sequence,
If the X0 does not have motion information, the motion information is checked in the order of the upper block (X1), upper left block (X2), and left block (X3) of the X0 in the order of X0 to generate the motion vector prediction candidate list Characterized in that, motion prediction method.
In the motion estimation apparatus for decoding a multi-view image implemented to include a first component that is a texture picture and a second component that is a depth picture for each view image:
a motion vector candidate generation unit generating a motion vector prediction candidate list using a block of any one of first and second elements of a decoded first view image; and
Decoding is performed by applying the motion vector corresponding to the index transmitted from the encoder using the motion vector prediction candidate list as the motion vector of the current block of the other component among the first and second components of the second view image. A motion vector application unit that does;
The motion vector candidate generation unit,
Spatial blocks (A0, A1, B0, B1, B2) corresponding to blocks in the current frame including the current block, and blocks in a reference frame that is another frame in the same type unit for the current frame Using the corresponding temporal blocks (C0, C1) and the blocks (X0, X1, X2, X3) in the frame including the block of any one of the components, blocks that do not overlap with each other are included. Create a motion vector candidate list,
The current block among the lower left block (A0), the left block (A1), the upper right block (B0), the upper block (B1), the upper left block (B2), and the blocks of any one of the components of the current block generating the motion vector prediction candidate list in the order of a block (X0) located at the same position and a block (C0) located at the same position as the current block in the reference frame;
If the C0 is not available, the lower right block C1 of the C0 is used in the C0 sequence,
If the X0 does not have motion information, the motion information is checked in the order of the upper block (X1), upper left block (X2), and left block (X3) of the X0 in the order of X0 to generate the motion vector prediction candidate list Characterized in that, the motion prediction device.
A motion prediction method for decoding a multi-view image, which is performed by a control unit including one or more processors and memory, and is implemented to include a first component that is a texture picture and a second component that is a depth picture for each view image. :
generating a motion vector prediction candidate list using a block of any one of first and second components of a decoded first view image; and
Decoding is performed by applying the motion vector corresponding to the index transmitted from the encoder to the motion vector of the current block of the other component among the first and second components of the second view image using the motion vector prediction candidate list. Including;
Generating the motion vector prediction candidate list includes:
Spatial blocks (A0, A1, B0, B1, B2) corresponding to blocks in the current frame including the current block, and blocks in a reference frame that is another frame in the same type unit for the current frame Using the corresponding temporal blocks (C0, C1) and the blocks (X0, X1, X2, X3) in the frame including the block of any one component, the blocks that do not overlap with each other are included. Create a motion vector candidate list,
Among the lower left block (A0), the left block (A1), the upper right block (B0), the upper block (B1), the upper left block (B2), and the blocks of any one of the components of the current block, generating the motion vector prediction candidate list in the order of a block (X0) located at the same position and a block (C0) located at the same position as the current block in the reference frame;
If the C0 is not available, the lower right block C1 of the C0 is used in the C0 sequence,
If the X0 does not have motion information, the motion information is checked in the order of the upper block (X1), upper left block (X2), and left block (X3) of the X0 in the order of X0 to generate the motion vector prediction candidate list Characterized in that, motion prediction method.

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