WO2012113197A1

WO2012113197A1 - Encoding or decoding method of prediction mode, and device thereof

Info

Publication number: WO2012113197A1
Application number: PCT/CN2011/076827
Authority: WO
Inventors: 梁立伟; 王宁; 左雯; 于培松; 郭秀江
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-02-24
Filing date: 2011-07-04
Publication date: 2012-08-30
Also published as: CN102355579B; CN102355579A

Abstract

Disclosed in the present invention are an encoding or decoding method of a prediction mode, and a device thereof. The method comprises: judging the availability of an adjacent image unit of a current image unit,and obtaining the prediction mode combination of the adjacent image unit; according to the obtained prediction mode combination and a pre-stored index list of a prediction mode list, obtaining a prediction mode list of the current image unit; and according to the prediction mode list of the current image unit, entropy encoding an actual prediction mode of the current image unit at an encoding end. The present invention obtains the prediction mode list most suitable for the current image unit by obtaining the prediction mode combination of the adjacent image unit, and entropy encodes the actual prediction mode according to the obtained prediction mode list, thus effectively combining the motion attribute, texture information, the current image unit and the like, realizing the encoding method for adaptive choosing prediction mode, and improving the efficiency of video compression.

Description

Method and device for encoding or decoding prediction mode

The present invention relates to the field of video coding and decoding, and in particular, to a coding mode or decoding method and apparatus for a prediction mode. Background technique

Video coding algorithms use a range of techniques to achieve efficient video coding, such as intra prediction, inter prediction, transform, quantization, and entropy coding. Firstly, block-based motion vector is used to prevent inter-frame redundancy of the image through inter prediction, and then intra-prediction is used to eliminate intra-frame redundancy of the image by using spatial prediction mode; then, the prediction residual is transformed and quantized to eliminate Visual redundancy of the image; finally further compression by entropy coding process of motion vector, prediction mode, quantization parameter and transformation parameter.

In the video coding prediction mode, skip mode, direct mode, merge mode, inter mode, and intra mode are included. For the encoding methods of these prediction modes, the encoding order currently used is the highest priority in the skip mode, and then several other modes. The above coding order is based on probability statistics, that is, the number of skip patterns is assumed to be the most, and so on.

However, for an image of a certain frame, due to the influence of motion attributes, texture information, and coding parameters between the frame images, the ordering of the above prediction modes may not be well adapted to the frame image to be encoded, and may be The redundancy of the codewords makes the video compression inefficient. Summary of the invention

In view of this, the main object of the present invention is to provide a coding mode or decoding method and apparatus for predictive mode, which can adaptively select a prediction mode coding method and improve the efficiency of video compression.

In order to achieve the above object, the technical solution of the present invention is achieved as follows: A method of encoding or decoding a prediction mode, the method comprising:

Determining the availability of adjacent image units of the current image unit, and acquiring a prediction mode combination of the adjacent image units according to the determination result;

Obtaining a prediction mode list of the current image unit according to the obtained prediction mode combination and the pre-stored prediction mode list index table;

When it is an encoding end, entropy encoding an actual prediction mode of the current image unit according to a prediction mode list of the current image unit; or

When it is a decoding end, entropy decoding the prediction mode of the current image unit according to the prediction mode list of the current image unit, to obtain an actual prediction mode of the current image unit.

The prediction mode included in the pre-stored prediction mode list index table is a combination of prediction modes of one adjacent image unit, a combination of prediction modes of two adjacent image units, and three adjacent images. a combination of prediction modes of cells, or a combination of prediction modes of four adjacent image cells;

The order of the prediction modes in the pre-stored prediction mode list is sorted according to the prediction mode combination corresponding to the prediction mode list index in the prediction mode list index table.

Preferably, when the prediction mode combination in the pre-stored prediction mode list index table is combined into a prediction mode of three adjacent image units, the prediction mode combination of acquiring adjacent image units is:

Obtaining prediction modes of four or three available neighboring image units of the current image unit; selecting three prediction modes from the four or three available prediction modes as prediction mode combinations of adjacent image units.

Obtaining a prediction mode of two available adjacent image units of the current image unit; A prediction mode of any unavailable adjacent image unit of the current image unit is configured as one of the prediction modes of the two available adjacent image units.

Obtaining a prediction mode of an available adjacent image unit of the current image unit;

A prediction mode of any two unavailable adjacent image units of the current picture unit is configured as a prediction mode of the one available adjacent picture unit.

The prediction modes of any three unavailable neighboring image units of the current image unit are respectively configured as one of the prediction modes in the prediction mode list index table, and the prediction modes of the selected three unavailable adjacent image units may be Configured to be the same or different.

An apparatus for predicting a mode, the apparatus comprising: a prediction mode acquisition module, a prediction mode list query module, and an encoding module;

a prediction mode acquiring module, configured to determine availability of adjacent image units of the current image unit, and obtain a prediction mode combination of the adjacent image units according to the determination result;

a prediction mode list querying module, configured to obtain a prediction mode list of the current image unit according to the prediction mode combination obtained by the prediction mode acquisition module and the pre-stored prediction mode list index table;

And an encoding module, configured to entropy encode the actual prediction mode of the current image unit according to the prediction mode list of the current image unit obtained by the prediction mode list query module.

The prediction mode combination in the prediction mode list index table stored in the prediction mode list query module is a combination of prediction modes of one adjacent image unit, and two adjacent images. a combination of a prediction mode of a unit, a combination of prediction modes of three adjacent image units, or a combination of prediction modes of four adjacent image units;

Preferably, when the prediction mode combination in the pre-stored prediction mode list index table is combined by the prediction mode of three adjacent image units, the prediction mode list query module is specifically configured to acquire four of the current image unit. a prediction mode of one or three available neighboring image units; three prediction modes are selected from the four or three available prediction modes as prediction mode combinations of adjacent image units.

Preferably, when the prediction mode combination in the pre-stored prediction mode list index table is combined by the prediction mode of three adjacent image units, the prediction mode list query module is specifically configured to acquire two current image units. A prediction mode of available adjacent image units; a prediction mode of any unavailable adjacent image units of the current picture unit is configured as one of the prediction modes of the two available adjacent image units.

Preferably, when the prediction mode combination in the pre-stored prediction mode list index table is combined by the prediction mode of three adjacent image units, the prediction mode list query module is specifically configured to acquire one of the current image units. Prediction mode of adjacent image units; a prediction mode of any two unavailable adjacent image units of the current image unit is configured as a prediction mode of the one available adjacent image unit.

Preferably, when the prediction mode combination in the pre-stored prediction mode list index table is combined by the prediction mode of three adjacent image units, the prediction mode list query module is specifically configured to use the current image unit The prediction modes of the three unavailable neighboring image units are respectively configured as one of the prediction modes in the prediction mode list index table, and the prediction modes of the selected three unavailable adjacent image units may be configured to be the same or different.

A decoding device for predictive mode, the device comprising: a prediction mode acquisition module, a prediction Mode list query module, decoding module; wherein

And a decoding module, configured to perform entropy decoding on the prediction mode of the current image unit according to the prediction mode list of the current image unit obtained by the prediction mode list query module, to obtain an actual prediction mode of the current image unit.

The prediction mode combination in the prediction mode list index table stored in the prediction mode list query module is a combination of prediction modes of one adjacent image unit, a combination of prediction modes of two adjacent image units, and three combinations. a combination of prediction modes of adjacent image units, or a combination of prediction modes of four adjacent image units;

The invention obtains a prediction mode list most suitable for the current image unit by acquiring a prediction mode combination of adjacent image units of the current image unit, and entropy encodes the actual prediction mode of the current image unit according to the obtained prediction mode list, and effectively combines The motion attribute and texture information of the current image unit realize the adaptive selection prediction mode coding method, which improves the efficiency of video compression. DRAWINGS

Figure 1 is a schematic diagram of an image unit and an adjacent image unit;

2 is a schematic diagram of an image unit and an adjacent image unit in a frame image;

3 is a schematic diagram of an image unit and an adjacent image unit in a frame image using a stripe Slice/GOB/VP; 4 is a schematic flowchart of an implementation of a coding or decoding method for a prediction mode according to the present invention; FIG. 5 is a schematic flowchart of an implementation of a method for encoding or decoding a prediction mode according to the present invention;

6 is a schematic structural diagram of an encoding apparatus of a prediction mode provided by the present invention;

FIG. 7 is a schematic structural diagram of a decoding apparatus for a prediction mode according to the present invention. detailed description

The basic idea of the present invention is: determining the availability of adjacent image units of the current image unit, and acquiring the prediction mode combination of the adjacent image units according to the determination result; obtaining the prediction mode combination and the pre-stored prediction mode list index table according to the obtained prediction mode combination table a prediction mode list of the current image unit; when it is an encoding end, entropy encoding the actual prediction mode of the current image unit according to the prediction mode list of the current image unit; or, when it is a decoding end, according to the A prediction mode list of the current image unit, entropy decoding the prediction mode of the current image unit to obtain an actual prediction mode of the current image unit.

In order to facilitate the understanding of the present invention, the concept of adjacent image elements of an image unit and its usability is first introduced.

The spatial position between an image unit E and its adjacent image units A, B, C and D is as shown in Fig. 1. The size of the image unit in Fig. 1 may be 16x16, 32x32, 64x64 or other pixel size; Is the left image unit of E, B is the upper image unit of E, C is the upper right image unit of E, and D is the upper left image unit of E.

The "availability" of an adjacent image unit (eight, B, C or D) means that the image unit should be within the image, and the image unit should belong to the same strip as the current image unit E (Slice/GOB/VP) Medium, and has been completed before E encoding or decoding; otherwise, adjacent image units are considered "unavailable".

Here, the image unit may be a Coding Unit (CU) or a Prediction Unit (High Efficiency Video Coding, HEVC). PU) can also be a macro block (MB) in standards such as H.264, H.263, and MPEG-4.

2 is a schematic diagram of an image unit and an adjacent image unit in a frame image, it can be seen that adjacent image units of the image unit E at the edge of the image are only partially available, even unavailable, such as the image unit E located in the upper left corner. Adjacent image units are not available; adjacent image unit portions of image unit E located in the lower left corner are available.

3 is a schematic diagram of an image unit and an adjacent image unit in one frame of images using Slice/GOB/VP. As shown in FIG. 3, even if image unit E is not at the edge of the image, since Slice/GOB/VP is used, Some adjacent image units may also be partially unavailable.

The present invention will be further described in detail below with reference to the accompanying drawings.

4 shows an implementation flow of a coding or decoding method of a prediction mode of the present invention. As shown in FIG. 4, the method includes the following steps:

Step 401: Determine the availability of adjacent image units of the current image unit.

Specifically, in this step, the availability of the adjacent image unit is determined by determining whether the actual prediction mode of the adjacent image unit has been obtained; if it has been obtained, the adjacent image unit is available, otherwise it is unavailable.

Step 402: Acquire a prediction mode combination of adjacent image units.

In this step, first, the prediction mode combination of the adjacent image unit of the current image unit is acquired according to the determination result of step 401; then, the adjacent image unit included in the prediction mode combination in the prediction mode list index table stored in advance is combined; Number, obtaining a prediction mode combination of adjacent image units; wherein, the combination of prediction modes may be a combination of prediction modes of one adjacent image unit, a combination of prediction modes of two adjacent image units, three adjacent Combination of prediction modes of image units, or combination of prediction modes of four adjacent image units; prediction mode list index table is an index table used to index a list of prediction modes, including predictions The mode combination and the prediction mode list index corresponding to the combination; the order of the prediction modes in the pre-stored prediction mode list is sorted according to the prediction mode combination corresponding to the prediction mode list index.

In addition, since the prediction mode further includes multiple types in the actual video standard, Skip Mode, Inter Mode, and Intra mode can be performed on the prediction modes of adjacent image units for the convenience of implementation. Mode) distinguishes between large categories, and does not further distinguish between inter-frame mode of 16 x 16 or 16 x 8 between frames, so when the prediction mode includes skip mode, inter mode, intra-frame Mode, when the combination of each prediction mode includes prediction modes of 3 adjacent image units, according to the arrangement and combination, it is necessary to store 3 ³ = 27 prediction mode lists in advance; when each prediction mode combination includes 2 phases When the prediction mode of the adjacent image unit is used, it is necessary to store 3 ² = 9 prediction mode lists in advance; and so on, and will not be described again.

Step 403: Obtain a prediction mode list Lp of the current image unit according to the prediction mode combination of the adjacent image unit of the current image unit obtained in step 402 and the pre-stored prediction mode list index table;

Specifically, the prediction mode list index table is queried, and the prediction mode combination of the prediction mode combination of the adjacent image unit obtained in step 402 is found in the prediction mode list index table, and the prediction mode list index corresponding to the combination is obtained. Through the index, a pre-stored prediction mode list corresponding to the index is further obtained as the prediction mode list Lp of the current image unit.

Step 404, when it is the encoding end, encoding the current image unit to obtain an actual prediction mode P;

Step 405: Entropy encoding the actual prediction mode P of the current image unit according to the prediction mode list Lp of the current image unit;

Step 406: When it is the decoding end, entropy decoding the prediction mode of the current image unit in the code stream according to the prediction mode list Lp of the current image unit, to obtain an actual pre-presence of the current image unit. Test mode P.

The foregoing method for encoding or decoding is specifically described below with reference to the prediction mode list index table shown in FIG. 5 and Table 1, wherein the prediction mode combinations in the prediction mode list index table shown in Table 1 include three adjacent images. The prediction mode of the unit, and for convenience of explanation, the prediction modes included in the prediction mode combination are: skip mode (represented as 0), inter mode (represented as 1), and intra mode (represented as 2). Adjacent image unit one adjacent image unit two adjacent image unit three prediction mode of the prediction mode of the current image unit pre-prediction mode prediction mode list index

0 0 0 0

0 0 1 1

0 0 2 2

0 1 0 3

0 1 1 4

0 1 2 5

0 2 0 6

0 2 1 7

0 2 2 8

1 0 0 9

1 0 1 10

1 0 2 11

1 1 0 12

1 1 1 13

1 1 2 14

1 2 0 15

1 2 1 16

1 2 2 17

2 0 0 18

2 0 1 19

2 0 2 20

2 1 0 21

2 1 1 22

2 1 2 23 2 2 0 24

2 2 1 25

2 2 2 26

Table 1

Figure 5 shows an implementation flow of a specific embodiment of the encoding or decoding method of the prediction mode of the present invention. As shown in Figure 5, the specific embodiment includes the following steps:

Step 501: Determine the availability of adjacent image units of the current image unit.

Step 502: Obtain a prediction mode of available adjacent image units.

In this step, when the current image unit has 3 or 4 available adjacent image units, the obtained adjacent image unit has a prediction mode of 3 or 4, and step 503 is performed; When the prediction modes of the available adjacent image units are two, step 504 is performed; when the obtained prediction mode of the adjacent image units is one, step 505 is performed; when there are no adjacent image units available in the current image unit When the obtained prediction mode of the adjacent image unit is 0, step 506 is performed;

Step 503, selecting three prediction modes from the obtained four or three available prediction modes as prediction mode combinations of adjacent image units, and performing step 507;

Step 504: Configure a prediction mode of any unavailable adjacent image unit of the current image unit as one of prediction modes of the available adjacent image unit, to obtain a prediction mode including 3 adjacent image units. Combination of prediction modes, step 507;

Step 505: Configure a prediction mode of any two unavailable adjacent image units of the current image unit as a prediction mode of the one available adjacent image unit, to obtain a prediction mode including three adjacent image units. Combination of prediction modes, step 507;

Step 506, predicting modes of any three unavailable adjacent image units of the current image unit Each of the prediction modes in the prediction mode list index table is configured to obtain a prediction mode combination of prediction modes including three adjacent image units, and step 507 is performed;

In this step, the prediction modes of the selected three unavailable adjacent image units may be configured to be the same or different.

Step 507: Obtain a prediction mode list Lp of the current image unit according to the obtained prediction mode combination of the adjacent image unit and the pre-stored prediction mode list index table.

Here, the prediction mode list index table is searched, and the prediction mode combination of the same prediction mode combination of the obtained adjacent image unit is found in the prediction mode list index table, and the prediction mode list index corresponding to the combination is obtained, and the index is obtained. Further obtaining a pre-stored prediction mode list corresponding to the index as a prediction mode list Lp of the current image unit;

For example, when the obtained prediction mode combination is (0, 0, 0), if the corresponding prediction mode list index is 0 by using Table 1, the prediction mode with index 0 can be further searched in the pre-stored prediction mode list. For example, in the embodiment of the present invention, the P frame in the Baseline in the H.264 standard is taken as an example, and the prediction mode list with the index of 0 can use the prediction mode list in the H.264 standard, as shown in Table 2: Prediction mode Number prediction mode

0 P — Skip

1 P—L0—16x16

2 P_L0_L0_16x8

3 P_L0_L0_8xl6

4 P_8x8

5 P_8x8ref0

6 Intra — 4x4

7 1—16x16—0—0—0

8 1—16x16—1—0—0

9 1—16x16—2—0—0

10 1—16x16—3—0—0

11 1-16x16—0—1—0 12 1—16x16—1—1—0

13 1—16x16—2—1—0

14 1-16x16—3—1—0

15 1-16x16—0—2—0

16 1—16x16—1—2—0

17 1—16x16—2—2—0

18 1—16x16—3—2—0

19 1—16x16—0—0—1

20 1-16x16—1—0—1

21 1—16x16—2—0—1

22 1-16x16—3—0—1

23 1-16x16—0—1—1

24 1-16x16—1—1—1

25 1—16x16—2—1—1

26 1—16x16—3—1—1

27 1-16x16—0—2—1

28 1—16x16—1—2—1

29 1—16x16—2—2—1

30 1—16x16—3—2—1

31 I- PCM

Table 2

At the same time, the order of the prediction modes in the prediction mode list, that is, the prediction mode number corresponding to each prediction mode, is a ranking according to the prediction mode combination corresponding to the prediction mode list index in the prediction mode list index table, for example, the index is The prediction mode list of 13 is as shown in Table 3. The prediction mode corresponding to index 13 in Table 1 is combined to be (1, 1, 1), that is, the prediction modes of adjacent image units of the current image unit are all inter mode. Therefore, the prediction mode of the current image unit is the most likely to be the inter mode, so the prediction mode numbers 1 to 5 belonging to the inter mode in Table 2 are raised to 0 to 4, and Table 3 is obtained, which can pass well. The motion relationship between the adjacent image unit and the current image unit effectively combines the motion attributes, texture information, and the like of the current image unit to select a prediction mode encoding method. Prediction mode number prediction mode 0 P-LO—16x16

1 P— LO— LO— 16x8

2 P- LO— LO— 8x16

3 P_8x8

4 P_8x8ref0

5 P- Skip

6 Intra — 4x4

7 1—16x16—0—0—0

8 1—16x16—1—0—0

9 1—16x16—2—0—0

10 1—16x16—3—0—0

11 1-16x16—0—1—0

12 1—16x16—1—1—0

13 1—16x16—2—1—0

14 1-16x16—3—1—0

15 1-16x16—0—2—0

16 1—16x16—1—2—0

17 1—16x16—2—2—0

18 1—16x16—3—2—0

19 1—16x16—0—0—1

20 1-16x16—1—0—1

21 1—16x16—2—0—1

22 1-16x16—3—0—1

23 1-16x16—0—1—1

24 1-16x16—1—1—1

25 1—16x16—2—1—1

26 1—16x16—3—1—1

27 1-16x16—0—2—1

28 1—16x16—1—2—1

29 1—16x16—2—2—1

30 1—16x16—3—2—1

31 I- PCM

table 3

Step 508: When the encoding end is used, the current image unit is encoded to obtain an actual prediction. Mode P, performing step 509;

Step 509: Entropy encoding the actual prediction mode P of the current image unit according to the prediction mode list Lp of the current image unit;

Specifically, when the prediction mode combination of the current image unit is (2, 2, 2), the prediction mode list Lp of the current image unit is a prediction mode list with an index of 26; as shown in Table 4; The actual prediction mode P is an intra mode. Referring to Table 2, the prediction mode numbers belonging to the intra mode in Table 2 are increased from 6 to 10 to 0 to 4, and a prediction mode list with an index of 26 shown in Table 4 is obtained. The priority of the actual prediction mode of the current image unit is significantly improved. For example, when the actual prediction mode of the current image unit is Intra_4 x 4, at this time, when the prediction mode Intra_4 4 is entropy encoded by Table 4, since the number corresponding to the prediction mode Intra_4 4 is 0, one bit can be used. The entropy coding of 0 is completed, so that only one bit is needed at this time to complete the entropy coding of the prediction mode Intra_4 4; and the prediction mode list in the H.264 standard is used (as shown in Table 2), due to the prediction mode The number corresponding to Intra_4 4 is 6, so it is necessary to use 5 bits to complete the entropy coding of 6. Therefore, 5 bits are needed at this time to complete the entropy coding of the prediction mode Intra_4 x 4 , and thus it can be seen that the present invention The purpose of entropy coding of the actual prediction mode P can be accomplished with fewer codewords. Prediction mode number prediction mode

0 Intra— 4x4

1 1—16x16—0—0—0

2 1—16x16—1—0—0

3 1—16x16—2—0—0

4 1—16x16—3—0—0

5 P-L0-16x16

6 P_L0_L0_16x8

7 P_L0_L0_8xl6

8 P_8x8

9 P_8x8ref0

10 P — Skip 11 1-16x16—0—1—0

12 1—16x16—1—1—0

13 1—16x16—2—1—0

14 1-16x16—3—1—0

15 1-16x16—0—2—0

16 1—16x16—1—2—0

17 1—16x16—2—2—0

18 1—16x16—3—2—0

19 1—16x16—0—0—1

20 1-16x16—1—0—1

21 1—16x16—2—0—1

22 1-16x16—3—0—1

23 1-16x16—0—1—1

24 1-16x16—1—1—1

25 1—16x16—2—1—1

26 1—16x16—3—1—1

27 1-16x16—0—2—1

28 1—16x16—1—2—1

29 1—16x16—2—2—1

30 1—16x16—3—2—1

31 I- PCM

Table 4

Step 510: When it is the decoding end, entropy decoding the prediction mode of the current image unit in the code stream according to the prediction mode list Lp of the current image unit, to obtain the actual prediction mode P of the current image unit.

FIG. 6 is a schematic diagram showing the structure of the encoding apparatus of the prediction mode provided by the present invention. As shown in FIG. 6, the encoding apparatus includes: a prediction mode acquisition module 61, a prediction mode list query module 62, and an encoding module 63;

The prediction mode obtaining module 61 is configured to determine the availability of the adjacent image unit of the current image unit, and acquire the prediction mode combination of the adjacent image unit according to the determination result; first, acquire a prediction mode of the adjacent image unit that is available for the current image unit; Then, based on pre-stored prediction modes The number of adjacent image units included in the prediction mode combination in the list index table is obtained, and the prediction mode combination of the adjacent image units is obtained; wherein the combination of the prediction modes may be a combination of prediction modes of one adjacent image unit, a combination of prediction modes of two adjacent image units, a combination of prediction modes of three adjacent image units, or a combination of prediction modes of four adjacent image units;

The prediction mode list index table is an index table used to index the prediction mode list, and includes a prediction mode combination and a prediction mode list index corresponding to the combination; and an arrangement order of the prediction modes in the pre-stored prediction mode list according to the prediction mode list The combination of prediction modes corresponding to the index is sorted.

The prediction mode list querying module 62 is configured to obtain a prediction mode list of the current image unit according to the prediction mode combination obtained by the prediction mode obtaining module 61 and the pre-stored prediction mode list index table; specifically, the query prediction mode list index table And obtaining, in the prediction mode list index table, a prediction mode combination that is the same as the prediction mode combination obtained by the prediction mode acquiring module 61, and further obtaining a prediction mode list index corresponding to the combination, and further obtaining the index by using the index A corresponding pre-stored prediction mode list is used as a prediction mode list of the current image unit.

The encoding module 63 is configured to entropy encode the actual prediction mode of the current image unit according to the prediction mode list of the current image unit obtained by the prediction mode list query module 62.

The prediction mode combination in the prediction mode list index table stored in the prediction mode list query module 62 is a combination of prediction modes of one adjacent image unit, a combination of prediction modes of two adjacent image units, and three Combination of prediction modes of adjacent image units, or combination of prediction modes of four adjacent image units; for ease of implementation, skip mode, inter mode, intra frame may be performed on prediction modes of adjacent image units The distinction between large categories such as patterns, and no further distinction is the inter mode between 16 X 16 or 16 x 8 between frames, so when the prediction mode includes skip mode, inter mode, intra mode , each prediction mode When the combination of the modes includes prediction modes of three adjacent image units, it is only necessary to store 3 ³ = 27 prediction mode lists in advance; when the combination of each prediction mode includes prediction modes of two adjacent image units, It is necessary to store 3 ² = 9 prediction mode lists in advance; and so on, and will not be described again.

Further, when the prediction mode combination in the pre-stored prediction mode list index table is combined into three prediction modes, the prediction mode list querying module 62 is specifically configured to acquire four or three available current image units. a prediction mode of adjacent image units; three prediction modes are selected from the four or three available prediction modes as prediction mode combinations of adjacent image units.

Further, when the prediction mode combination in the pre-stored prediction mode list index table is combined into three prediction modes, the prediction mode list querying module 62 is specifically configured to acquire two available adjacent images of the current image unit. a prediction mode of the unit; configuring a prediction mode of any unavailable adjacent image unit of the current picture unit as one of the prediction modes of the two available adjacent image units.

Further, when the prediction mode combination in the pre-stored prediction mode list index table is combined into three prediction modes, the prediction mode list querying module 62 is specifically configured to acquire one available adjacent image unit of the current image unit. Prediction mode; a prediction mode of any two unavailable adjacent image units of the current picture unit is configured as a prediction mode of the one available adjacent picture unit.

Further, when the prediction mode combination in the pre-stored prediction mode list index table is combined into three prediction modes, the prediction mode list query module 62 is specifically configured to use any three of the current image units that are unavailable. The prediction modes of the adjacent image units are respectively configured as one of the prediction modes in the prediction mode list index table, and a prediction mode combination including a prediction mode of three adjacent image units is obtained; wherein the three unavailable phases are selected Prediction of adjacent image units Modes can be configured to be the same or different.

FIG. 7 is a schematic diagram showing the structure of a decoding apparatus of a prediction mode provided by the present invention. As shown in FIG. 7, the decoding apparatus includes: a prediction mode acquisition module 71, a prediction mode list query module 72, and a decoding module 73;

The prediction mode obtaining module 71 is configured to determine the availability of the adjacent image unit of the current image unit, and obtain the prediction mode combination of the adjacent image unit according to the determination result; first, acquire a prediction mode of the adjacent image unit that is available for the current image unit; Then, the prediction mode combination of the adjacent image unit is obtained according to the number of adjacent image units included in the prediction mode combination in the pre-stored prediction mode list index table; wherein the combination of the prediction modes may be one adjacent image unit a combination of a prediction mode, a combination of prediction modes of two adjacent image units, a combination of prediction modes of three adjacent image units, or a combination of prediction modes of four adjacent image units;

The prediction mode list querying module 72 is configured to obtain a prediction mode list of the current image unit according to the prediction mode combination obtained by the prediction mode obtaining module 71 and the pre-stored prediction mode list index table; specifically, the query prediction mode list index table And obtaining, in the prediction mode list index table, a prediction mode combination that is the same as the prediction mode combination obtained by the prediction mode acquiring module 71, and further obtaining a prediction mode list index corresponding to the combination, and further obtaining the index by using the index A corresponding pre-stored prediction mode list is used as a prediction mode list of the current image unit.

The decoding module 73 is configured to perform entropy decoding on the prediction mode of the current image unit according to the prediction mode list of the current image unit obtained by the prediction mode list query module 72, to obtain a current The actual prediction mode of the image unit.

The prediction mode combination in the prediction mode list index table stored in the prediction mode list query module 72 is a combination of prediction modes of one adjacent image unit, a combination of prediction modes of two adjacent image units, and three a combination of prediction modes of adjacent image units, or a combination of prediction modes of four adjacent image units; for ease of implementation, a prediction mode of available adjacent image units may be skip mode, inter mode, The distinction between large categories such as intra mode, and no further distinction is the inter mode between 16 X 16 or 16 x 8 between frames, so when the prediction mode includes skip mode, inter mode, frame In the inner mode, when the combination of each prediction mode includes the prediction mode of 3 adjacent image units, it is necessary to store 3 ³ = 27 prediction mode lists in advance; when each prediction mode combination includes 2 adjacent image units For the prediction mode, it is necessary to store 3 ² = 9 prediction mode lists in advance; and so on, and will not be described again.

It should be understood that the foregoing encoding apparatus and decoding apparatus may also be combined in the same apparatus, and the combined codec apparatus includes a prediction mode acquiring module, a prediction mode list querying module, an encoding module, and a decoding module; wherein each module has the function and the above The same, no longer repeat them.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A method for encoding or decoding a prediction mode, the method comprising: determining availability of adjacent image units of a current image unit, and acquiring a prediction mode combination of adjacent image units according to the determination result;

2. The method according to claim 1, wherein the combination of prediction modes included in the pre-stored prediction mode list index table is: a combination of prediction modes of one adjacent image unit, two adjacent Combination of prediction modes of image units, combination of prediction modes of three adjacent image units, or combination of prediction modes of four adjacent image units; arrangement of prediction modes in the pre-stored prediction mode list The ordering is performed according to a combination of prediction modes corresponding to the prediction mode list index in the prediction mode list index table.

The method according to claim 1, wherein when the combination of the prediction modes in the pre-stored prediction mode list index table is a combination of prediction modes of three adjacent image units, the acquiring neighbors The prediction mode combination of the image unit is:

The method according to claim 1, wherein when the combination of the prediction modes in the pre-stored prediction mode list index table is a combination of prediction modes of three adjacent image units, the acquiring neighbors The prediction mode combination of the image unit is: Obtaining a prediction mode of two available adjacent image units of the current image unit; configuring a prediction mode of the adjacent image unit of any one of the current image units to be one of the prediction modes of the two available adjacent image units .

An apparatus for encoding a prediction mode, the apparatus comprising: a prediction mode acquisition module, a prediction mode list query module, and an encoding module;

8. The apparatus according to claim 7, wherein the prediction mode list query The prediction mode combination in the prediction mode list index table stored in advance by the module is: combination of prediction modes of one adjacent image unit, combination of prediction modes of two adjacent image units, prediction mode of three adjacent image units a combination of performed, or a combination of prediction modes of four adjacent image elements;

In the pre-stored prediction mode list, the order of the prediction modes is sorted according to the prediction mode combination corresponding to the prediction mode list index in the prediction mode list index table.

The encoding apparatus according to claim 7, wherein when the prediction mode combination in the pre-stored prediction mode list index table is a combination of prediction modes of three adjacent image units, the prediction mode a list query module, specifically for acquiring a prediction mode of four or three available adjacent image units of the current image unit; selecting three prediction modes from the four or three available prediction modes as adjacent image units The combination of prediction modes.

The encoding apparatus according to claim 7, wherein when the prediction mode combination in the pre-stored prediction mode list index table is combined by a prediction mode of three adjacent image units, the prediction mode a list query module, specifically configured to acquire a prediction mode of two available adjacent image units of the current image unit; and configure a prediction mode of any unavailable adjacent image unit of the current image unit as the two available neighbors Image unit prediction mode

The encoding apparatus according to claim 7, wherein when the prediction mode combination in the pre-stored prediction mode list index table is a combination of prediction modes of three adjacent image units, the prediction mode a list query module, specifically configured to acquire a prediction mode of an available adjacent image unit of the current image unit; configured a prediction mode of any two unavailable adjacent image units of the current image unit as the one available adjacent image The prediction mode of the unit.

The encoding apparatus according to claim 7, wherein the prediction mode combination in the pre-stored prediction mode list index table is a prediction mode of three adjacent image units. When the combination of the rows, the prediction mode list query module is specifically configured to configure a prediction mode of any three unavailable image units of the current image unit as one of the prediction modes in the prediction mode list index table, and The prediction modes of the selected three unavailable adjacent image units may be configured to be the same or different.

A decoding device of a prediction mode, the device comprising: a prediction mode acquisition module, a prediction mode list query module, and a decoding module;

The decoding apparatus according to claim 13, wherein the prediction mode combination in the prediction mode list index table stored in advance by the prediction mode list query module is: a combination of prediction modes of one adjacent image unit, a combination of prediction modes of two adjacent image units, a combination of prediction modes of three adjacent image units, or a combination of prediction modes of four adjacent image units;