CN102685477B - Method and device for obtaining image blocks for merging mode - Google Patents
Method and device for obtaining image blocks for merging mode Download PDFInfo
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Abstract
An embodiment of the invention provides a method and a device for obtaining image blocks for a merging mode. The method includes obtaining adjacent blocks according to a scheduled order when at least two adjacent blocks exist on the left or at the top of the current image block; and determining the adjacent blocks which coincide with a scheduled rule to be the image blocks for merging mode. According to the embodiment of the method and the device for obtaining the image blocks for the merging mode, a plurality of adjacent blocks which are on the left or at the top of the current image blocks are obtained in order, therefore available candidate blocks can be obtained as many as possible. Image blocks which belong to the same object or have similar texture with the current image block can be possibly obtained so as to be used in the merging mode due to increase of the amount of the available candidate blocks, and therefore encoding performance is improved.
Description
Technical field
The embodiment of the present invention relates to image processing field, and more specifically, relates to the method and apparatus obtaining for the image block of merging patterns.
Background technology
In Video coding and decoding framework, hybrid coding structure is generally used for the Code And Decode of video sequence.The coding side of hybrid coding structure generally includes: prediction module, conversion module, quantization modules and entropy coding module; The decoding end of hybrid coding structure generally includes: entropy decoder module, inverse quantization module, inverse transform block and predictive compensation module.The redundant information of video sequence can be effectively removed in the combination of these Code And Decode modules, and can ensure to obtain in decoding end the coded image of video sequence.
In Video coding and decoding framework, the image of video sequence is conventionally divided into image block and encodes.Piece image is divided into some image blocks, and these image blocks use above-mentioned module to carry out Code And Decode.
In above-mentioned module, prediction module obtains the prediction block message of the image block of video sequence coding image for coding side, and then obtain the residual error of image block, predictive compensation module obtains the prediction block message of current decoded image blocks for decoding end, then the image block residual error obtaining according to decoding obtains current decoded image blocks.Prediction module comprises infra-frame prediction and two kinds of technology of inter prediction conventionally.Wherein, infra-prediction techniques utilize current image block aerial image prime information remove current image block redundant information with obtain residual error; Inter prediction technology utilize present image contiguous encoding or decoded picture Pixel Information has been removed current image block redundant information to obtain residual error.In inter prediction technology, the image contiguous for the present image of inter prediction is called as reference picture.
In inter prediction technology, coding side, in order effectively to remove the redundant information of current image block, need to obtain the image block the most similar to current image block in reference picture, and then reduces the residual error of current image block.Coding side uses estimation to obtain the image block in above-mentioned reference picture conventionally.In existing video coding and decoding technology, motion estimation process is searched for suitable matching image piece conventionally in the time of coding in reference picture taking image block as unit, current macro and matching image piece institute respective pixel value are subtracted each other and obtained residual error, and the value that this residual error is obtained through conversion and after quantizing is carried out entropy coding, the bit stream obtaining of finally entropy being encoded writes in encoding code stream, also the side-play amount (being motion vector) of search gained is write in encoding code stream in the lump simultaneously.Correspondingly, first obtain entropy coded bit stream when decoding end predictive compensation (or title motion compensation) after, carry out entropy decoding, obtain corresponding residual error, and corresponding motion vector, afterwards, in reference picture, obtain corresponding matching image piece (both prediction block messages of above-mentioned current decoded image blocks) according to motion vector value, then the value of corresponding pixel points in the image block of coupling and residual values is added and obtains the decoded value of current macro.
In existing video encoding and decoding standard, as MPEG-2, H.264/AVC, an image block, or be called macro block (macroblock), supermacro piece (super-macroblock) etc., be divided into some subimage blocks, the size of these subimage blocks can be 64 × 64,64 × 32,32 × 64,32 × 32,32 × 16,16 × 32,16 × 16,16 × 8,8 × 16,8 × 8,8 × 4,4 × 8,4 × 4 etc., and subimage block carries out above-mentioned Motion estimation and compensation with these sizes.In existing video encoding and decoding standard, these subimage blocks are the rectangular block of N × M (N and M are the integer that is greater than 0), and N and M have multiple relation.
In existing video encoding standard, the shortcoming of image block and subimage block coding mode is not have well to consider space or the temporal continuity of moving object in image or image texture.Object in image and texture are often corresponding is not only an image block or subimage block, and probably corresponding to the irregular region continuously of a slice on time or space, therefore in the direction of some in image, adjacent image piece or subimage block may belong to same object simultaneously or have same textural characteristics.Now, if the mode of N × M rectangular block is carried out inter prediction encoding in employing existing standard, so in the time obtaining the motion vector of current image block or subimage block, cause error to increase thereby likely can be referenced to the motion vector that does not belong to same object or texture region of the same race, this coded system can not make full use of the movable information of the adjacent image piece that belongs to same object or textural characteristics in addition.
For the problems referred to above, in Video coding framework, introduce the decoding method of a kind of image block or subimage block merging patterns.The method of image block merging patterns refers in the time that current block carries out interframe encoding and decoding, directly take out and present encoding piece at the movable information of the adjacent image block of time domain or spatial domain or subimage block the movable information as current image block, wherein comprise the number of motion vector, reference frame index and reference picture etc.Adopting image block or all motions of subimage block of merging patterns is that information all comes from above-mentioned adjacent image block or subimage block, and now current image block or subimage block do not need any motion vector information of encoding again.Adjacent image block refers to: in space, be positioned at the image block of the current encoding and decoding piece left side, top, upper left side, lower left, or in time domain, be arranged in previous coded image and present encoding piece and have the image block of common location.If the adjacent image piece of certain position does not exist, or not yet encoding and decoding, or use intra prediction mode coding, be called image block unavailable, abandon this adjacent image piece.Current existing technology has adopted 5 possible adjacent image pieces, be respectively in left side piece, top piece, former frame and current block has image block, upper right side image block and the lower left image block of common location, these possible adjacent image pieces are called as candidate image piece.
Due to the available candidate image block of current encoding and decoding image block may exist multiple, so current image block need to be used the label (0-4) of extra identification means for the adjacent image piece that identifies current image block and adopt.At present the identification method in prior art combines the label of the adjacent image piece that adjacent block number that current image block can use and current image block use, and in the time that available adjacent image piece is 1, does not identify; In the time that available adjacent image piece is 2, adopt 1 bit (bit) mark; When available adjacent image piece is when more than 3 or 3, adopt variable-length encoding (1-4 bit).
The left image piece adjacent with the current image block upper left corner and top image block while using in the prior art merging patterns to obtain the left side and top candidate image piece, are only checked, think that the left side or top candidate image piece can not obtain when the left image piece adjacent with the current image block upper left corner or top image block when unavailable, the candidate image piece number that can be used for merging patterns can reduce.If only obtain in a manner described and check the reference image block of the left side and top merging patterns, thereby cannot utilize well the movable information of adjacent image piece to affect coding efficiency.
Summary of the invention
The embodiment of the present invention provides a kind of method and apparatus obtaining for the image block of merging patterns, can improve coding efficiency.
According to an aspect of the present invention, provide a kind of method of obtaining for the image block of merging patterns, having comprised: on the current image block left side or top exist when at least two adjacent blocks, obtain adjacent block according to predefined procedure; Definite adjacent block that meets pre-defined rule is the image block for merging patterns.
According to a further aspect in the invention, provide a kind of equipment obtaining for the image block of merging patterns, having comprised: acquiring unit, on the current image block left side or top exist when at least two adjacent blocks, obtain adjacent block according to predefined procedure; Determining unit, the adjacent block that meets pre-defined rule for determining is the image block for merging patterns.
Embodiment of the present invention order is obtained multiple adjacent blocks of the current image block left side or top, thereby obtains as much as possible available candidate blocks.Because available candidate blocks number increases, thereby ensure more likely to obtain the image block that belongs to an object together or there is similar texture to current image block to use in merging patterns, therefore improved coding efficiency.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 has described the schematic diagram of the position of candidate image piece under merging patterns.
Fig. 2 is the schematic diagram of having described the adjacent image piece of current image block.
Fig. 3 is the schematic flow diagram for the method for the image block of merging patterns that obtains according to the embodiment of the present invention.
Fig. 4 is the schematic diagram that obtains according to an embodiment of the invention the mode of image block.
Fig. 5 is the schematic diagram that obtains according to another embodiment of the present invention the mode of image block.
Fig. 6 is the schematic diagram that obtains according to another embodiment of the present invention the mode of image block.
Fig. 7 is the schematic block diagram for the equipment of the image block of merging patterns that obtains according to the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 has described the schematic diagram of the position of candidate image piece under merging patterns.As mentioned above, current existing technology has adopted 5 possible adjacent image pieces (candidate image piece), be respectively in left side piece, top piece, former frame and current block has image block, upper right side image block and the lower left image block of common location, in Fig. 1, be labeled as respectively b1-b5.
While using in the prior art merging patterns to obtain the left side and top candidate image piece, only obtain and checked the left image piece adjacent with the current image block upper left corner and top image block, think that the left side or top candidate image piece can not obtain when the left image piece adjacent with the current image block upper left corner or top image block when unavailable, the candidate image piece number that can be used for merging patterns can reduce.And in fact at the left image piece adjacent with the current image block upper left corner or top image block when unavailable, still may there is available image block in other left side or the top image block adjacent with current image block.
Fig. 2 is the schematic diagram of having described the adjacent image piece of current image block.In Fig. 2 and accompanying drawing below, inter represents that this image block is " inter-coded block ", and intra represents that this image block is " Intra-coded blocks ".As shown in Figure 2, the left image piece adjacent with current image block CB has four, and label is Lblk0 to Lblk3.Be not useable for merging patterns although Lblk0 is Intra-coded blocks, Lblk1 to Lblk3 is inter-coded block, can be used for merging patterns.In like manner, top image block adjacent with current image block in Fig. 2 has four, and label is Tblk0 to Tblk3, is not useable for merging patterns although Tblk0 and Tblk1 are Intra-coded blocks, and Tblk2 and TLblk3 are inter-coded block, can be used for merging patterns.Because the basic point of departure of merging patterns is that current image block CB belongs to same object or has similar texture to adjacent image piece, therefore they can share movable information (containing the number of motion vector, reference frame index and reference picture etc.).And because Lblk1 to Lblk3, Tblk2 to Tblk3 are all adjacent with current image block, these image blocks are with likely adjacent with current image block CB, therefore they also can be used in merging patterns.If only check the reference image block of the left side and top merging patterns by the mode of above-mentioned Fig. 1, thereby cannot utilize well the movable information of adjacent image piece to affect coding efficiency.
Fig. 3 is the schematic flow diagram for the method 30 of the image block of merging patterns that obtains according to the embodiment of the present invention.Method 30 is mainly used on the current image block left side or top exists situation when at least two adjacent blocks.
At the S32 of method 30, obtain described adjacent block according to predefined procedure.Then at S35, definite adjacent block that meets pre-defined rule is the image block for merging patterns.
Like this, the embodiment of the present invention is in the time obtaining the left side of merging patterns and the image block of top, be not limited to the left side piece Lblk0 shown in the left side piece b1 shown in Fig. 1 and top piece b5 or Fig. 2 and top piece Tblk0, but order is obtained multiple adjacent blocks of the current image block left side or top, thereby obtain as much as possible available candidate blocks.Because available candidate blocks number increases, thereby ensure more likely to obtain the image block that belongs to an object together or there is similar texture to current image block to use in merging patterns, thereby improve coding efficiency.
The different modes for the image block of merging patterns that obtains of the embodiment of the present invention is described below in conjunction with specific embodiment.Fig. 4 is the schematic diagram that obtains according to an embodiment of the invention the mode of image block.Fig. 4 is an example of the usable image piece for obtaining the left side and top.
Use when merging patterns and in the current image block CB left side or top candidate image piece process, to adopt the predefined image block that obtains order and obtain the left side or the top that can be used for merging patterns obtaining, obtain upper first the available image block of order as the left side or top candidate image piece.Can be to determine inter-coded block or Intra-coded blocks (or other encoding and decoding pieces) according to the pre-defined rule of the embodiment of the present invention.For example, if an adjacent block is inter-coded block, determine that this adjacent block is the image block that can be used for merging patterns.In addition, if an adjacent block is Intra-coded blocks, determine that this adjacent block is not useable for merging patterns.
As shown in Figure 4, while obtaining left side candidate image piece, obtain successively Lblk0, Lblk1, Lblk2 and Lblk3 by order from top to bottom.In Fig. 4, obtaining upper first piece of order is that Lblk0 is Intra-coded blocks, is not useable for merging patterns, therefore continues to obtain Lblk1.Lblk1 is inter-coded block, can be used for merging patterns, therefore the left image piece using Lblk1 as merging patterns.In like manner, as shown in Figure 4, while obtaining top image block, obtain successively Tblk0, Tblk1, Tblk2 and Tblk3 by order from left to right.In Fig. 4, obtaining upper first piece of order is that Tblk0 is Intra-coded blocks, unavailable, therefore continues to obtain Tblk1.Tblk1 is also intra-frame prediction block, unavailable, continues to obtain Tblk2.Tblk2 is inter-coded block, can be used for merging patterns, therefore the left image piece using Tblk2 as merging patterns.
Although the order shown in Fig. 4 is from top to bottom, the embodiment of the present invention is not limited to this.The above-mentioned order of obtaining is predefined and has various ways, and in the time obtaining left image piece, obtaining order can be for from top to bottom, also can be from the bottom up, and also can obtain by the order at interval.For example, can first judge whether Lblk0 can use, judge whether Lblk2 can use if Lblk0 is unavailable, by that analogy.In the time obtaining top candidate image piece, obtaining order can, for from left to right, also can turn left from the right side, and also can obtain by the order at interval.For example first judge whether Tblk0 can use, judge whether Tblk2 can use if Tblk0 is unavailable, by that analogy.
Fig. 5 is the schematic diagram that obtains according to another embodiment of the present invention the mode of image block.
As shown in Figure 2 and Figure 5, the adjacent block Lblk0 to Lblk3 on the lower left corner candidate blocks LBblk of current image block CB and the left side of current image block CB is all positioned at the left side of current image block CB.Between these image blocks, movable information is similar to textural characteristics.In addition, the adjacent block Tblk0 to Tblk3 of the upper right corner candidate blocks RTblk of current image block CB and the top of current image block CB is all positioned at the upside of current image block CB, and between these image blocks, movable information is similar to textural characteristics.If LBblk and RTblk are worked as a candidate image piece,, in the time that these image blocks can be used for merging patterns, need to use extra bit to be used for identifying them.As in the time that the left side, top, lower-left, upper right image block are all available, need to use 2 bit identification current image block to use which candidate image piece.
The embodiment of Fig. 5 also includes lower left corner candidate blocks LBblk or upper right corner candidate blocks RTblk in and obtains in order.
Particularly, the candidate blocks LBblk in the current image block CB lower left corner is listed in to the obtaining in order of left side adjacent block in the time obtaining the image block on the left side; The image block RTblk in the image block CB upper right corner is listed in to obtaining in order of top adjacent block in the time obtaining top image block.As shown in Figure 5, while obtaining left image piece, obtain successively Lblk0, Lblk1, Lblk2, Lblk3 and LBblk by order from top to bottom, judge whether that available rule is the same.In like manner, as shown in Figure 5, while obtaining top image block, obtain successively Tblk0, Tblk1, Tblk2, Tblk3 and RTblk by order from left to right, judge whether that available standard is the same.
The above-mentioned order of obtaining is predefined and has various ways, and in the time obtaining left image piece, obtaining order can be for from top to bottom, also can be from the bottom up, and also can obtain by the order at interval; In the time obtaining top image block, obtaining order can, for from left to right, also can turn left from the right side, and also can obtain by the order at interval.
According to the embodiment shown in Fig. 5, due to the candidate blocks without independent bit is set represents the upper right corner and the lower left corner, can reduce coded-bit number.
Fig. 6 is the schematic diagram that obtains according to another embodiment of the present invention the mode of image block.
In Fig. 6, also adopt above-mentioned similar obtain manner to determine to lower-left image block or upper right image block.Particularly, the obtain manner of acquisition lower-left image block can be that starting point is by sequentially obtaining using first available image block as lower-left image block from the bottom up from LBblk; The obtain manner that obtains upper right image block can be that starting point is obtained using first available image block as upper right image block by the order of turning left from the right side from RTblk.As shown in Figure 6, obtaining successively LBblk and LBblk3 image block. first available image block is as the lower-left image block for merging patterns; Obtain successively RTblk and Tblk3, first available image block is as the upper right image block for merging patterns.Meanwhile, obtain successively Lblk0, Lblk1 and Lblk2, first available image block is as left image piece; Obtain successively Tblk0, Lblk1 and Lblk2, first available image block is as top image block.
The different examples of the method that can apply the embodiment of the present invention have been described above.The equipment for the image block of merging patterns that obtains according to the embodiment of the present invention is described below.Fig. 7 is the schematic block diagram for the equipment 70 of the image block of merging patterns that obtains according to the embodiment of the present invention.
As shown in Figure 7, obtain equipment 70 and comprise acquiring unit 72 and determining unit 75.Acquiring unit 72 on the current image block left side or top exist when at least two adjacent blocks, obtain adjacent block according to predefined procedure.Determining unit 75 meets pre-defined rule adjacent block for determining is the image block for merging patterns.
Therefore, order is obtained multiple adjacent blocks of the current image block left side or top, thereby obtains as much as possible available candidate blocks.Because available candidate blocks number increases, thereby ensure more likely to obtain the image block that belongs to an object together or there is similar texture to current image block to use in merging patterns, thereby improve coding efficiency.
Each element that obtains equipment 70 can be carried out the various piece of method 30 recited above, for avoiding repetition, repeats no more.For example, acquiring unit 72 can obtain by order from top to bottom or from the bottom up the adjacent block on the current image block CB left side.
According to another embodiment of the present invention, acquiring unit 72 obtains the adjacent block on the current image block CB left side and the candidate blocks (participation Fig. 5) in the current image block CB lower left corner by order from top to bottom or from the bottom up.
According to one embodiment of present invention, acquiring unit 72 by from left to right or the order of turning left from the right side obtain the adjacent block of current image block CB top, or, by from left to right or the order of turning left from the right side obtain the adjacent block of current image block CB top and the candidate blocks in the current image block CB upper right corner.
Those of ordinary skill in the art can recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software is clearly described, composition and the step of each example described according to function in the above description in general manner.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can realize described function with distinct methods to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
The software module that the method for describing in conjunction with embodiment disclosed herein or the step of algorithm can use hardware, processor to carry out, or the combination of the two is implemented.Software module can be placed in the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
Although illustrated and described some embodiments of the present invention, it will be understood by those skilled in the art that without departing from the principles and spirit of the present invention, can carry out various amendments to these embodiment, such amendment should fall within the scope of the present invention.
Claims (12)
1. obtain the method for the image block of merging patterns, it is characterized in that, comprising:
On the current image block left side or top exist when at least two adjacent blocks, obtain described adjacent block according to predefined procedure;
Definite adjacent block that meets pre-defined rule is the image block for merging patterns.
2. the method for claim 1, is characterized in that, obtains described adjacent block comprise according to predefined procedure:
Obtain the adjacent block on the described current image block left side by order from top to bottom or from the bottom up.
3. the method for claim 1, is characterized in that, obtains described adjacent block comprise according to predefined procedure:
Obtain the adjacent block on the described current image block left side and the candidate blocks in the described current image block lower left corner by order from top to bottom or from the bottom up.
4. the method for claim 1, is characterized in that, obtains described adjacent block comprise according to predefined procedure:
By from left to right or the order of turning left from the right side obtain the adjacent block of described current image block top.
5. the method for claim 1, is characterized in that, obtains described adjacent block comprise according to predefined procedure:
By from left to right or the order of turning left from the right side obtain the adjacent block of described current image block top and the candidate blocks in the described current image block upper right corner.
6. the method for claim 1, is characterized in that, definite adjacent block that meets described pre-defined rule is to comprise for the image block of merging patterns:
If adjacent block is inter-coded block, determine that this adjacent block is the described image block for merging patterns.
7. the method for claim 1, is characterized in that, definite adjacent block that meets pre-defined rule is to comprise for the image block of merging patterns:
Definite first adjacent block that meets pre-defined rule is the image block for merging patterns.
8. obtain the equipment for the image block of merging patterns, it is characterized in that, comprising:
Acquiring unit, on the current image block left side or top exist when at least two adjacent blocks, obtain described adjacent block according to predefined procedure;
Determining unit, the adjacent block that meets pre-defined rule for determining is the image block for merging patterns.
9. equipment as claimed in claim 8, is characterized in that, described acquiring unit obtains the adjacent block on the described current image block left side by order from top to bottom or from the bottom up.
10. equipment as claimed in claim 8, is characterized in that, described acquiring unit obtains the adjacent block on the described current image block left side and the candidate blocks in the described current image block lower left corner by order from top to bottom or from the bottom up.
11. equipment as claimed in claim 8, is characterized in that, described acquiring unit by from left to right or the order of turning left from the right side obtain the adjacent block of described current image block top.
12. equipment as claimed in claim 8, is characterized in that, described acquiring unit by from left to right or the order of turning left from the right side obtain the adjacent block of described current image block top and the candidate blocks in the described current image block upper right corner.
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| CN102883163B (en) | 2012-10-08 | 2014-05-28 | 华为技术有限公司 | Method and device for building motion vector lists for prediction of motion vectors |
| US20160134891A1 (en) * | 2013-04-23 | 2016-05-12 | Samsung Electronics Co., Ltd. | Multi-viewpoint video encoding method using viewpoint synthesis prediction and apparatus for same, and multi-viewpoint video decoding method and apparatus for same |
| EP3310055A4 (en) * | 2015-06-09 | 2018-06-20 | Huawei Technologies Co. Ltd. | Image encoding/decoding method and apparatus |
| WO2017147765A1 (en) * | 2016-03-01 | 2017-09-08 | Mediatek Inc. | Methods for affine motion compensation |
| WO2017201678A1 (en) * | 2016-05-24 | 2017-11-30 | 华为技术有限公司 | Image prediction method and related device |
| US11095892B2 (en) | 2016-09-20 | 2021-08-17 | Kt Corporation | Method and apparatus for processing video signal |
| CN112567755B (en) | 2018-08-10 | 2022-11-08 | 华为技术有限公司 | Decoding method, device and system using merging mode |
| WO2020048366A1 (en) * | 2018-09-03 | 2020-03-12 | Huawei Technologies Co., Ltd. | Coding method, device, system with merge mode |
| WO2020140242A1 (en) * | 2019-01-03 | 2020-07-09 | 北京大学 | Video processing method and apparatus |
| CN111447452A (en) * | 2020-03-30 | 2020-07-24 | 西安万像电子科技有限公司 | Data coding method and system |
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