CN101977317A - Intra-frame prediction method and device - Google Patents
Intra-frame prediction method and device Download PDFInfo
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Abstract
The invention discloses an intra-frame prediction method. The method comprises the following steps of: predefining a plurality of block partitioning modes of macroblocks; selecting the block partitioning mode of the current macroblock according to the block partitioning mode of the encoded macroblock adjacent to the current macroblock and performing block partitioning on the current macroblock by utilizing the selected block partitioning mode; and predicting and encoding the partitioned blocks of the current macroblock. In the method, requirements of different video or image sequences are met by predefining the plurality of block partitioning modes for the macroblocks. At the same time, in the method, the scheme of the block partitioning mode adopted by the current macroblock is determined according to the statistic analysis on the block partitioning mode adopted by the encoded macroblock adjacent to the current macroblock, so the prediction effect is improved.
Description
[technical field]
The present invention relates to field of video encoding, particularly the infra-prediction techniques in the video compression coding.
[background technology]
Video coding can be divided into video lossless coding and video compression coding two big classes.In Digital Television and video communication etc. are used, because the restriction of the network bandwidth and what the requirement of data volume size was generally used is video compression coding, relatively Chang Yong international standard have H.261/263/264, the AVS standard of MPEG-1/2/4 and Chinese independent intellectual property right etc.Video compression coding is generally taked based on the macroblock encoding mode, promptly the two field picture in the video is divided into the macro block of a plurality of non-overlapping copies, afterwards these macro blocks is encoded.
Spatially there is very strong correlation in video sequence image, and for example in a two field picture, its background is the wall of same decorative pattern of one side and quality.So, in the several macro blocks that is divided in this two field picture, the information that the macro block of relevant wall may show is identical or similar, can adopt infra-prediction techniques to encode to the high macro block of these spatial coherence degree.The second generation source encoding standard A VS standard that possesses independent intellectual property right with China is an example, and the method that adopts is the every two field picture in the video sequence to be divided into the macro block of 16*16 pixel usually, and then goes to adopt different Predicting Techniques to encode to macro block.Some two field pictures in the whole video sequence (the normally initial several frames in one group of image) are to adopt the infra-prediction techniques coding to eliminate spatial redundancy, and all the other two field pictures all are to adopt the inter prediction technology for encoding to eliminate time redundancy.Carry out image encoded when carrying out concrete infra-frame prediction these being adopted infra-prediction techniques, the piecemeal that the macro block of each 16*16 pixel also needs further to be divided into 4 8*8 pixels with the predictive coding of carrying out luminance block (for convenience of description, herein as an example with the luminance block predictive coding, the rest may be inferred about chrominance block), the concrete piecemeal to macro block is illustrated shown in Figure 1A.Please continue then with reference to Figure 1B, it shows the principle schematic of carrying out predictive coding in the prior art for the luminance block piecemeal of a 8*8 pixel.For each pixel A 00 in the luminance block piecemeal of each 8*8 pixel shown in Figure 1A, A01, A02 ..., A07, A10, A11 ..., A77, can utilize this piecemeal left side adjacent pixels b0, b1, b2 ..., b15 and top adjacent pixels a0, a1, a2 ..., a15 and top left pixel Z predict with certain strategy and finish coding.Concrete predicting strategy comprises modes such as horizontal forecast, vertical prediction, bottom right 45 degree predictions, like this for a macro block, respectively each piecemeal is carried out infra-frame prediction after being divided into 4 piecemeals, need carry out the coding of 4 intra prediction modes altogether.
The shortcoming that it should be noted that this kind scheme is macro block is only adopted a kind of minute fixing block mode, and promptly the piecemeal that the macro block of a 16*16 pixel is divided into 4 8*8 pixels carries out the mode of subsequent prediction coding then.Though such mode computational complexity is low, adopting the prediction effect that can reach with a kind of piecemeal model prediction institute for the texture image different with details is not unusual ideal.
Therefore, demand proposing a kind of new technique scheme that can overcome above-mentioned shortcoming urgently.
[summary of the invention]
The purpose of this part is to summarize some aspects of embodiments of the invention and briefly introduces some preferred embodiments.In this part and the application's specification digest and denomination of invention, may do a little simplification or omit avoiding the making purpose of this part, specification digest and denomination of invention fuzzy, and this simplification or omit and can not be used to limit the scope of the invention.
The object of the present invention is to provide a kind of new intra-frame prediction method and device, adopt multiple different branch block mode to satisfy the different video demand of image sequence in other words macro block.
In order to reach purpose of the present invention, according to an aspect of the present invention, the invention provides a kind of intra-frame prediction method, described method comprises: a plurality of minutes block modes of predefine macro block; When current macro is non-boundary block,, and utilize the branch block mode of selecting that current macro is carried out piecemeal according to the branch block mode of the piecemeal model selection current macro of the adjacent coded macroblocks of current macro; Piecemeal to current macro carries out predictive coding.
Further, when the size of described macro block was the 16*16 pixel, a plurality of minutes block modes of described macro block comprised the piecemeal, the piecemeal that is divided into 2 16*8 pixels that are divided into 4 8*8 pixels, be divided into the piecemeal of 2 8*16 pixels and be divided into the piecemeal of 1 16*16 pixel.
Further, the coded macroblocks that current macro is adjacent comprises the left macro block of current macro, upper left macro block, goes up macro block and upper right macro block.
Further, the branch block mode of described piecemeal model selection current macro according to the adjacent coded macroblocks of current macro is:
The branch block mode of the coded macroblocks that the statistics current macro is adjacent will be used the branch block mode that maximum piecemeal model selections is a current macro.
Further, describedly be used maximum branch block modes when not unique, with the branch block mode that is current macro of the less the sort of piecemeal model selection of piecemeal wherein.
Further, described to be used maximum branch block modes unique and when dividing block size all identical, selects the sort of minute block mode of the horizontal direction pixel value of piecemeal wherein greater than vertical direction pixel value.
According to a further aspect in the invention, the invention provides a kind of infra-frame prediction device, described device comprises: statistical module, add up the branch block mode of the adjacent coded macroblocks of described current macro; The piecemeal module is carried out piecemeal according to the maximum branch block mode that is adopted by the adjacent coded macroblocks of current macro to current macro; With the predictive coding module, the piecemeal of current macro is carried out predictive coding; Wherein, described current macro is non-boundary block.
Further, the coded macroblocks that described current macro is adjacent comprises: the left macro block of current macro, upper left macro block, last macro block and upper right macro block.
Further, when the adjacent coded macroblocks of described current macro adopts maximum branch block modes not unique, the branch block mode that it is current macro that described piecemeal module is incited somebody to action the wherein less the sort of piecemeal model selection of piecemeal.
Further, described to be used maximum branch block modes unique and when dividing block size all identical, and described piecemeal module is selected the sort of minute block mode of the horizontal direction pixel value of piecemeal wherein greater than vertical direction pixel value.
Compared with prior art, the present invention by to macro block predefine multiple minute block mode satisfy the different video demand of image sequence in other words.The present invention simultaneously determines the scheme of the branch block mode that current macro should adopt then according to the adjacent branch block mode that coded macroblocks adopted of current macro is carried out statistical analysis, has improved prediction effect.
[description of drawings]
In conjunction with reaching ensuing detailed description with reference to the accompanying drawings, the present invention will be more readily understood, the structure member that wherein same Reference numeral is corresponding same, wherein:
Figure 1A is the macro block in the two field picture and the structural representation of piecemeal in the prior art;
Figure 1B is for carrying out the principle schematic of infra-frame prediction to a piecemeal in the prior art;
Fig. 2 is the method flow diagram of the intra-frame prediction method in one embodiment of the present of invention;
Fig. 3 is the schematic diagram of the branch block mode of the macro block in one embodiment of the present of invention;
Fig. 4 is the structural representation of the adjacent coded macroblocks of the macro block in one embodiment of the present of invention; With
Fig. 5 is the block diagram of the infra-frame prediction device in one embodiment of the present of invention.
[embodiment]
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
One of the emphasis of intra-frame prediction method of the present invention and device and bright spot are: macro block is carried out piecemeal with the process of carrying out the subsequent frame intraprediction encoding in, current macro is adopted more than a kind of branch block mode, and utilize the adjacent branch block mode that coded macroblocks adopted of current macro to select the branch block mode of current macro.
Please refer to Fig. 2, it shows the method flow diagram of the intra-frame prediction method 200 in one embodiment of the present of invention.Described intra-frame prediction method 200 comprises: step 202, a plurality of minutes block modes of predefine macro block; Step 204 when current macro is non-boundary block, according to the branch block mode of the piecemeal model selection current macro of the adjacent coded macroblocks of current macro, and utilizes the branch block mode of selecting that current macro is carried out piecemeal; Step 206 is carried out predictive coding to the piecemeal of current macro.
In step 202, the branch block mode of predefine macro block at first.Be example also with second generation source encoding standard A VS standard, because the macroblock size in this standard is the 16*16 pixel, have only a kind of minute block mode in the traditional approach, promptly the piecemeal that the macro block of a 16*16 pixel is divided into 4 8*8 pixels carries out the mode of subsequent prediction coding then.And in the present embodiment, the branch block mode of described macro block comprises the piecemeal, the piecemeal that is divided into 2 16*8 pixels that are divided into 4 8*8 pixels, be divided into the piecemeal of 2 8*16 pixels and be divided into four kinds of the piecemeals of 1 16*16 pixel, as shown in Figure 3.Adopt multiple different branch block mode can satisfy the different video demand of image sequence in other words like this.
In step 204, when current macro is non-boundary block,, and utilize the branch block mode of selecting that current macro is carried out piecemeal according to the branch block mode of the piecemeal model selection current macro of the adjacent coded macroblocks of current macro.Because the neighboring macro-blocks in the same frame has stronger correlation, so when concrete piecemeal, select the branch block mode of current macro comparatively reasonable according to the adjacent branch block mode that coded macroblocks adopted of current macro.The coded macroblocks that described current macro is adjacent can comprise the left macro block of current macro, upper left macro block, go up macro block and upper right macro block, as shown in Figure 4.Certainly adopt other the adjacent pieces combinations such as left macro block, last macro block and upper right macro block also to be fine, decide on specific embodiment.Add up the branch block mode of the adjacent coded macroblocks of current macro then, according to wherein being used the piecemeal that maximum branch block modes carries out current macro, adopt the branch block mode of the piecemeal that is divided into 2 8*16 pixels, upper left macro block to adopt the branch block mode of the piecemeal that is divided into 1 16*16 pixel, last macro block to adopt the branch block mode of the piecemeal that is divided into 2 8*16 pixels and the branch block mode that upper right macro block also adopts the piecemeal that is divided into 2 8*16 pixels such as the left macro block of current macro, then after statistical analysis, current macro is also adopted the branch block mode of the piecemeal that is divided into 2 8*16 pixels.But because the adjacent coded macroblocks of current macro of statistics is an even number, described maximum not unique situation of branch block mode that is used appears sometimes, at this moment getting wherein, the sort of minute less block mode of piecemeal carries out piecemeal to current macro, adopt the branch block mode of the piecemeal that is divided into 2 8*16 pixels such as the left macro block of current macro, upper left macro block adopts the branch block mode of the piecemeal that is divided into 1 16*16 pixel, last macro block adopts the branch block mode of the piecemeal that is divided into 2 8*16 pixels and the branch block mode that upper right macro block adopts the piecemeal that is divided into 1 16*16 pixel, then find to be divided into the branch block mode of piecemeal of 1 16*16 pixel and the branch block mode that is divided into the piecemeal of 2 8*16 pixels and all be used twice after statistical analysis, the branch block mode of piecemeal of at this moment selecting to be divided into 2 8*16 pixels is as the branch block mode of current macro.Obviously also has a special case this moment, promptly being used maximum branch block modes is the branch block mode and the branch block mode that is divided into the piecemeal of 2 16*8 pixels that is divided into the piecemeal of 2 8*16 pixels, this moment, the piecemeal of two kinds of branch block modes was onesize, the branch block mode of piecemeal of then selecting to be divided into 2 16*8 pixels this moment is as the branch block mode of current macro, be the branch block mode of the horizontal direction pixel value of piecemeal greater than vertical direction pixel value, this is because the correlation of image level direction will be higher than the correlation of vertical direction usually.But in some specific embodiments, the branch block mode of piecemeal that also can select to be divided into 2 8*16 pixels at this moment is as the branch block mode of current macro.
In addition when current macro is boundary block, because the adjacent piece of current macro disappearance, can adopt calculate current macro carry out rate distortion (RDO) cost of four kinds of branch block modes or absolute error and (SAD) etc. parameter select wherein optimum partitioned mode to be used as the branch block mode of current macro then.About this class calculating or selection mode is content well-known to those skilled in the art, is not repeated at this.
Described intra-frame prediction method by to macro block predefine multiple minute block mode to satisfy the different video demand of image sequence in other words.Need elder generation that the branch block mode of current macro is predicted equally at the video decode end and just begin follow-up decoding processing then.Especially, when adding coding in certain embodiments also need the video code flow information behind coding for the piecemeal pattern information of boundary block, so that the video decode end is to the boundary block normal decoder in the image, take aforesaid prediction mode to predict that its minute block mode decodes then for non-boundary block then.It is also recognized that, among the different embodiment, the piecemeal default mode that the adjacent piece combination of the current macro that the predefine that adopts divides block mode, choose is adopted during for boundary block with current macro all may be different, look specific embodiment computing capability and technical staff's enforcement and difference to some extent.Described intra-frame prediction method can obviously improve the performance of infra-frame prediction, reduces the needed code word of transmission frame inner estimation mode.Though increased certain computation complexity at coding side and decoding end, almost can ignore.
The present invention also provides a kind of infra-frame prediction device, please refer to Fig. 5, and it shows the block diagram of the infra-frame prediction device 500 in one embodiment of the present of invention.Described infra-frame prediction device 500 is applicable to the luminance block intraframe predictive coding in the second generation source encoding standard A VS standard.Described infra-frame prediction device 500 comprises judge module 502, statistical module 504, piecemeal module 506, predictive coding module 508 and the module 510 of selecting the superior.
Described judge module 502 judges whether current macro is boundary macroblocks, if, then enter the module 510 of selecting the superior and carry out the rate distortion costs calculating of various minutes block modes, and give described piecemeal module 506 with result of calculation, the branch block mode of piecemeal module 506 selection rate distortion cost minimums is as the branch block mode of current macro and carry out piecemeal then; If current macro is non-boundary macroblocks, then enter statistical module 504
The branch block mode of the coded macroblocks that the described current macro of described statistical module 504 statistics is adjacent.The coded macroblocks that described current macro is adjacent comprises the left macro block of current macro, upper left macro block, goes up macro block and upper right macro block.
Described piecemeal module 506 is carried out piecemeal according to the maximum branch block mode that is adopted by the adjacent coded macroblocks of described current macro to described current macro.Adopt the branch block mode of the piecemeal that is divided into 2 8*16 pixels, upper left macro block to adopt the branch block mode of the piecemeal that is divided into 1 16*16 pixel, last macro block to adopt the branch block mode of the piecemeal that is divided into 2 8*16 pixels and the branch block mode that upper right macro block also adopts the piecemeal that is divided into 2 8*16 pixels such as the left macro block of current macro, then after statistical analysis, current macro is also adopted the branch block mode of the piecemeal that is divided into 2 8*16 pixels.But because the adjacent coded macroblocks of current macro of statistics is an even number, described maximum not unique situation of branch block mode that is used appears sometimes, at this moment getting wherein, the sort of minute less block mode of piecemeal carries out piecemeal to current macro, adopt the branch block mode of the piecemeal that is divided into 2 8*16 pixels such as the left macro block of current macro, upper left macro block adopts the branch block mode of the piecemeal that is divided into 1 16*16 pixel, last macro block adopts the branch block mode of the piecemeal that is divided into 2 8*16 pixels and the branch block mode that upper right macro block adopts the piecemeal that is divided into 1 16*16 pixel, then find to be divided into the branch block mode of piecemeal of 1 16*16 pixel and the branch block mode that is divided into the piecemeal of 2 8*16 pixels and all be used twice after statistical analysis, the branch block mode of piecemeal that at this moment described piecemeal module 506 selects to be divided into 2 8*16 pixels is as the branch block mode of current macro and carry out piecemeal.If be used maximum branch block modes in addition is the branch block mode and the branch block mode that is divided into the piecemeal of 2 16*8 pixels that is divided into the piecemeal of 2 8*16 pixels, this moment, the piecemeal of two kinds of branch block modes was onesize, and then the branch block mode of piecemeal that this moment, described minute block mode 506 selected to be divided into 2 16*8 pixels is as the branch block mode of current macro and carry out piecemeal.
The piecemeal of 508 pairs of described current macro of described predictive coding module carries out predictive coding.For different branch block modes, each macro block needs respectively its piecemeal to be carried out the coding of a different intra prediction mode.For the branch block mode of the piecemeal that is divided into 1 16*16 pixel, a macro block has only a piecemeal, only need carry out the coding of an intra prediction mode.For piecemeal that is divided into 2 16*8 pixels and the branch block mode that is divided into the piecemeal of 2 8*16 pixels, a macro block need carry out the coding of 2 intra prediction modes.For the branch block mode of the piecemeal that is divided into 4 8*8 pixels, a macro block need carry out the coding of 4 intra prediction modes.
Above-mentioned explanation has fully disclosed the specific embodiment of the present invention.It is pointed out that and be familiar with the scope that any change that the person skilled in art does the specific embodiment of the present invention does not all break away from claims of the present invention.Correspondingly, the scope of claim of the present invention also is not limited only to described embodiment.
Claims (10)
1. intra-frame prediction method is characterized in that it comprises:
A plurality of minutes block modes of predefine macro block;
When described current macro is non-boundary block,, and utilize the branch block mode of selecting that current macro is carried out piecemeal according to the branch block mode of the piecemeal model selection current macro of the adjacent coded macroblocks of current macro;
Piecemeal to current macro carries out predictive coding.
2. method according to claim 1, it is characterized in that, when the size of described macro block was the 16*16 pixel, a plurality of minutes block modes of described macro block comprised the piecemeal, the piecemeal that is divided into 2 16*8 pixels that are divided into 4 8*8 pixels, be divided into the piecemeal of 2 8*16 pixels and be divided into the piecemeal of 1 16*16 pixel.
3. method according to claim 1 is characterized in that, the coded macroblocks that current macro is adjacent comprises the left macro block of current macro, upper left macro block, goes up macro block and upper right macro block.
4. method according to claim 1 is characterized in that, the branch block mode of described piecemeal model selection current macro according to the adjacent coded macroblocks of current macro is:
The branch block mode of the coded macroblocks that the statistics current macro is adjacent will be used the branch block mode that maximum piecemeal model selections is a current macro.
5. method according to claim 4 is characterized in that, describedly is used maximum branch block modes when not unique, with the branch block mode that is current macro of the less the sort of piecemeal model selection of piecemeal wherein.
6. method according to claim 4 is characterized in that, described to be used maximum branch block modes unique and when dividing block size all identical, selects the sort of minute block mode of the horizontal direction pixel value of piecemeal wherein greater than vertical direction pixel value.
7. infra-frame prediction device is characterized in that it comprises:
Statistical module is added up the branch block mode of the adjacent coded macroblocks of described current macro;
The piecemeal module is carried out piecemeal according to the maximum branch block mode that is adopted by the adjacent coded macroblocks of current macro to current macro; With
The predictive coding module is carried out predictive coding to the piecemeal of current macro; Wherein, described current macro is non-boundary block.
8. device according to claim 7 is characterized in that, the coded macroblocks that described current macro is adjacent comprises: the left macro block of current macro, upper left macro block, last macro block and upper right macro block.
9. device according to claim 7, it is characterized in that, when the adjacent coded macroblocks of described current macro adopts maximum branch block modes not unique, the branch block mode that it is current macro that described piecemeal module is incited somebody to action the wherein less the sort of piecemeal model selection of piecemeal.
10. device according to claim 7, it is characterized in that, described to be used maximum branch block modes unique and when dividing block size all identical, and described piecemeal module is selected the sort of minute block mode of the horizontal direction pixel value of piecemeal wherein greater than vertical direction pixel value.
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| CN103248885A (en) * | 2012-02-14 | 2013-08-14 | 乐金电子(中国)研究开发中心有限公司 | Intra frame image prediction coding and decoding methods, video coder and video decoder |
| WO2015123806A1 (en) * | 2014-02-18 | 2015-08-27 | Mediatek Singapore Pte. Ltd. | Methods for depth based block partitioning |
| CN107197280A (en) * | 2011-06-17 | 2017-09-22 | Jvc 建伍株式会社 | Picture coding device, method for encoding images and recording medium |
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| CN107197280B (en) * | 2011-06-17 | 2020-06-16 | Jvc 建伍株式会社 | Image encoding device, image encoding method, and recording medium |
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Address after: 214028 10-storey Building 530 Qingjia Road, Taihu International Science Park, Wuxi New District, Jiangsu Province Patentee after: WUXI ZHONGGAN MICROELECTRONIC CO., LTD. Address before: 214028 10-storey Building 530 Qingjia Road, Taihu International Science Park, Wuxi New District, Jiangsu Province Patentee before: Wuxi Vimicro Co., Ltd. |