CN101867807B - Selection device and method of intra-frame prediction mode - Google Patents
Selection device and method of intra-frame prediction mode Download PDFInfo
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Abstract
The invention discloses a selection device and a method of an intra-frame prediction mode, wherein the method comprises the following steps: firstly receiving the compression configuration of frame information and receiving the picture resolution of the frame information; then selecting a plurality of corresponding prediction modes according to the compression configuration and the picture resolution, scheduling the plurality of selected prediction modes, sequentially calculating and obtaining a plurality of corresponding value functions; and selecting one of the plurality of the prediction modes as the prediction mode of the frame information according to the plurality of comparison value functions.
Description
Technical field
The present invention relates to a kind of choice device and method of intra-frame prediction mode, particularly a kind of choice device of intra-frame prediction mode of H.264 form and method.
Background technology
In recent years along with the progress of electronic technology, at the technical elements of image display corresponding breakthrough is arranged also.Especially aspect the demonstration of animated image, for making display can effectively promote the expressivity of its animated image, have successively multiple image compression standard to be suggested, H.264 encoding and decoding standard wherein is exactly at the most representative high compression numerical digit video encoding and decoding standard now.
In encoding and decoding standard H.264, when determining to select the interior predictive mode (intraprediction mode) of picture frame, must calculate its cost function (cost function) for all possible picture frame internal schema (intra mode) first.And because intra-frame prediction mode comprises the huge block mode of I4, the huge block mode of I8, the huge block mode of I16 and colourity (chroma) pattern four large classes.And also having comprised 26 spermotypes, need to calculate this four large class intra-frame prediction mode.In addition, wherein I 4 huge block modes and I 8 huge block modes need again to carry out the prediction of so-called loop (closeloop), hence one can see that, the frequency range that determine to select the action of intra-frame prediction mode always need to expend sizable hardware resource and be used for carrying out computing.Therefore, the scheduling of carrying out when predicting for I 4 huge block modes, the huge block mode of I8, the huge block mode of I16 and chroma mode is very important.
Below please be simultaneously with reference to Fig. 1, Fig. 1 illustrates the scheduling mode of existing a kind of intra-frame prediction mode.Illustrating of Fig. 1 mainly is sequentially to predict for the huge block mode of I4, I16 block mode and chroma mode.Briefly, first sequentially carry out the prediction 111～112 of the huge block mode of I4 and the reconstruction 121～122 of the huge block mode of I4 for the different blocks of picture frame data exactly, then sequentially carry out again the prediction 131～132 of I 16 huge block modes for the different blocks of picture frame data, last then carry out the prediction 141 of chroma mode.Then then please refer to Fig. 2, Fig. 2 illustrates the staggered scheduling mode of existing a kind of intra-frame prediction mode.Different from the scheduling mode of Fig. 1 is, wherein is inserted into time dead during the reconstruction 221,222 of carrying out I 4 huge block modes about the prediction 231,232 of the huge block mode of I16.So, just can effectively save the predicted time of the extra huge block mode of execution I16 and save the frequency range of computing.
Because the scheduling mode that Fig. 1 and Fig. 2 illustrate all reckons without the huge block mode of I8.Therefore, illustrate the scheduling mode of the intra-frame prediction mode of existing high configuration (high profile) reduced form just like Fig. 3.Please refer to Fig. 3, the scheduling mode that Fig. 3 illustrates is by ignoring the part of the huge block mode of I16, and utilize open loop (computing of open～loop) (only predict for the huge block mode of I4, I8, and do not rebuild) needed hardware resource and frequency range when reducing computing.
Summary of the invention
A purpose of the present invention provides a kind of system of selection of intra-frame prediction mode, carries out scheduling for several predictive modes of picture frame data, sequentially to produce several cost functions.
Another object of the present invention provides a kind of choice device of intra-frame prediction mode, carries out scheduling in order to several predictive modes for the picture frame data, sequentially to produce several cost functions.
For achieving the above object, the present invention proposes a kind of system of selection of intra-frame prediction mode, comprising: at first, receive the compressed configuration of picture frame data, and receive the picture resolution of picture frame data.Then, select several corresponding predictive modes according to described compressed configuration and described picture resolution, and carry out scheduling sequentially to calculate and to obtain several corresponding cost functions for selected described several predictive modes.Last one of them next predictive mode as the picture frame data of selecting again described several predictive modes according to described several relative value functions.
In one of the present invention embodiment, above-mentioned compressed configuration comprises high configuration, main configuration or basic configuration.
In one of the present invention embodiment, above-mentioned picture resolution comprises high-res or General Analytical degree.
In one of the present invention embodiment, above-mentioned predictive mode comprises the huge block mode of I4, the huge block mode of I8, the huge block mode of I16 and colourity (chroma) pattern.
In one of the present invention embodiment, above-mentioned describedly select corresponding predictive mode to comprise according to compressed configuration and picture resolution: when compressed configuration is main configuration, and the picture resolution is selected the huge block mode of I4, the huge block mode of I16 and chroma mode when being General Analytical degree or high-res.If when compressed configuration is basic configuration, and the picture resolution is selected the huge block mode of I4, the huge block mode of I16 and chroma mode when being General Analytical degree or high-res equally.In addition, when compressed configuration is that high configuration and picture resolution are General Analytical when spending, select too the huge block mode of I4, the huge block mode of I16 and chroma mode.Uniquely different be when compressed configuration is high configuration and picture resolution when being high-res, to select the huge block mode of I8, the huge block mode of I16 and chroma mode.
In one of the present invention embodiment, above-mentioned describedly carry out scheduling for predictive mode and comprise: when the predictive mode of selecting is the huge block mode of I4, the huge block mode of I16 and chroma mode, carry out the prediction of the huge block mode of I16 in the prediction time dead when carrying out the prediction of the huge block mode of I4, and the reconstruction time dead when carrying out the reconstruction of I 4 huge block modes is carried out the prediction of chroma mode.In addition, when the predictive mode of selecting is the huge block mode of I8, the huge block mode of I16 and chroma mode, carry out first the prediction of the huge block mode of I8, carry out again the prediction of the huge block mode of I16, then carry out again the prediction of chroma mode, and in the end carry out the reconstruction of the huge block mode of I8.
For achieving the above object, the present invention also proposes a kind of choice device of intra-frame prediction mode, comprises scheduling controller, cost function generator and cost function comparison circuit.Wherein, the scheduling controller receives compressed configuration and the picture resolution of picture frame data, selects several corresponding predictive modes according to compressed configuration and picture resolution, and carries out scheduling for described several predictive modes.The cost function generator connects the scheduling controller, and the prediction of predictive mode is sequentially carried out in the scheduling that the cost function generator carries out described several predictive modes according to the scheduling controller, and produces several corresponding cost functions.The cost function comparison circuit connects described cost function generator, and more described several cost functions of cost function comparison circuit are to select one of them next predictive mode as described frame data of described several predictive modes.
In sum, compressed configuration and the picture resolution of the present invention by the picture frame data selected corresponding predictive mode, and carries out scheduling for the predictive mode of the interior picture of corresponding selection.Thus, the predictive mode that only is necessary can be carried out the action of prediction, can effectively lower clock pulse number or the hardware resource of carrying out the prediction computing, and the result by scheduling is so that several predictive modes can more efficient application system resource when predicting, reduces the cost and the waste of power.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate appended graphic being described in detail below.
Description of drawings
Fig. 1～3 illustrate respectively the scheduling mode of existing three kinds of different intra-frame prediction modes;
Fig. 4 illustrates the choice device 400 of the intra-frame prediction mode of one embodiment of the invention;
Fig. 5 illustrates the execution mode that the scheduling controller 410 in the embodiment of the invention carries out scheduling;
Fig. 6 illustrates another execution mode that the scheduling controller 410 in the embodiment of the invention carries out scheduling;
Fig. 7 illustrates the flow chart of system of selection of the intra-frame prediction mode of embodiments of the invention.
Accompanying drawing main element symbol description
111～112, the prediction of the huge block mode of 511:I4;
121～122,221,222, the reconstruction of the huge block mode of 512:I4;
131～132,231,232,513,612, the prediction of the huge block mode of 652:I16;
611, the prediction of the huge block mode of 651:I8;
The reconstruction of the huge block mode of 614:I8;
141,514,613,653: the prediction of chroma mode;
400: the choice device of intra-frame prediction mode;
410: the scheduling controller;
420: the cost function generator;
430: the cost function comparison circuit;
510～550,610～650: the block prediction of picture frame data;
560,660: the relative value function;
S710～S740: the step of the system of selection of intra-frame prediction mode.
Embodiment
Below please refer to Fig. 4, Fig. 4 illustrates the choice device 400 of the intra-frame prediction mode of one embodiment of the invention.The choice device 400 of intra-frame prediction mode comprises scheduling controller 410, cost function generator 420 and cost function comparison circuit 430.Scheduling controller 410 receives compressed configuration and the picture resolution of picture frame data to be dealt with, and selects several corresponding predictive modes according to compressed configuration and picture resolution, and carries out scheduling for these predictive modes of electing.Wherein so-called compressed configuration comprises high configuration (high profe), main configuration (mainprofile) or basic configuration (base profile), and image analytic degree then comprises two kinds of the CIF of the FULL HD of high-res and General Analytical degree.In addition, all be that those skilled in the art can both know, and therefore do not add explanation at this in the encoding and decoding standard field H.264 about above-mentioned three kinds of configurations and two kinds of resolutions.
In addition, employed predictive mode generally includes the huge block mode of I4, the huge block mode of I8, the huge block mode of I16 and chroma mode in encoding and decoding standard H.264.The huge block mode of so-called I4 is exactly that to utilize the block of 4 * 4 in the picture frame data be the prediction of picture in the picture frame that carries out of unit.Identical, the huge block mode of I8 and the huge block mode of I16 then are to be respectively the prediction of picture in the picture frame that carries out of unit for the block of 8 * 8 and 16 * 16 in the picture frame data.
And aspect several predictive modes of selecting to use at scheduling controller 410,410 of scheduling controllers are to select according to the table 1 of lower example.Table 1 wherein is as follows:
Table 1:
| Compressed configuration | The picture resolution | The predictive mode of selecting |
| Basic configuration | CIF | The huge block mode of I4, the huge block mode of I16 and chroma mode |
| Basic configuration | FULL HD | The huge block mode of I4, the huge block mode of I16 and chroma mode |
| Main configuration | CIF | The huge block mode of I4, the huge block mode of I16 and chroma mode |
| Main configuration | FULL HD | The huge block mode of I4, the huge block mode of I16 and chroma mode |
| High configuration | CIF | The huge block mode of I4, the huge block mode of I16 and chroma mode |
| High configuration | FULL HD | The huge block mode of I8, the huge block mode of I16 and chroma mode |
Can be learnt clearly that by table 1 scheduling controller 410 can have different compressed configurations and the picture resolution is classified for various, and select applicable predictive mode to predict, can save the frequency range of computing.
Behind the scheduling controller 410 selected predictive modes that will predict, 410 of scheduling controllers carry out selected predictive mode is carried out scheduling.Wherein, scheduling controller 410 can be different and carry out different scheduling modes for selected predictive mode, propose different execution modes for different scheduling modes and are illustrated with next, wish that those skilled in the art can both understand and tool to implement.
Below please be simultaneously with reference to Fig. 4 and Fig. 5, Fig. 5 illustrates the execution mode that the scheduling controller 410 in the embodiment of the invention carries out scheduling.Wherein when scheduling controller 410 selected predictive modes were the huge block mode of I4, the huge block mode of I16 and chroma mode, the method that scheduling controller 410 carries out illustrating such as Fig. 5 was carried out scheduling.Namely first predict 510 for the block 0 of picture frame data, comprising prediction and reconstruction, the prediction of the huge block mode of I16 and the prediction of chroma mode of carrying out the huge block mode of I4.Further illustrating, is exactly the prediction 511 of carrying out first the huge block mode of I4, and then carries out the reconstruction 512 of the huge block mode of I4.When the execution of the huge block mode prediction 513 of I16 then crisscrosses the prediction 511 of carrying out the huge block mode of I4, in the prediction time dead that produces.Relatively, when 514 of the predictions of chroma mode crisscross the reconstruction 512 of carrying out the huge block mode of I4, in the reconstruction time dead that produces.
After the prediction of the block 0 of having finished the picture frame data, then sequentially carry out the prediction of the block 1～15 of picture frame data, and after the prediction 550 of the block 15 of having finished the picture frame data, then carry out the action 560 of relative value function.
This generation that note that cost function corresponding generation when carrying out various predictive mode.Please be simultaneously with reference to Fig. 4 and Fig. 5,420 meetings of cost function generator come corresponding generation cost function according to the forecasting sequence of the predictive mode of 410 schedulings of scheduling controller.In other words, when all predictive modes all are performed when complete, the cost function that those predictive modes are corresponding also all is produced to be finished.
Therefore, when all predictive modes all be performed complete after, 430 of cost function comparison circuits compare according to cost function, and it is minimum to select cost function, come as selected predictive mode.Get on very well simply, when if the cost function that the huge block mode of I4 is corresponding is lower than the corresponding cost function of the huge block mode of I16, then select the next predictive mode as this picture frame data of the huge block mode of I4, on the contrary, when if the cost function that the huge block mode of I4 is corresponding is higher than the corresponding cost function of the huge block mode of I16, then select the next predictive mode as this picture frame data of the huge block mode of I16.
Below please be simultaneously with reference to Fig. 4 and Fig. 6, Fig. 6 illustrates another execution mode that the scheduling controller 410 in the embodiment of the invention carries out scheduling.Wherein when scheduling controller 410 selected predictive modes were the huge block mode of I8, the huge block mode of I16 and chroma mode, the method that scheduling controller 410 carries out illustrating such as Fig. 6 was carried out scheduling.Namely first predict 610 for the block 0 of picture frame data, comprising prediction and reconstruction, the prediction of the huge block mode of I16 and the prediction of chroma mode of carrying out the huge block mode of I8.Further illustrating, is exactly the prediction 611 of carrying out first I 8 huge block modes, and then carries out the prediction 612 of the huge block mode of I16, then carries out the prediction 613 of chroma mode again, and in the end carries out the reconstruction 614 of I 8 huge block modes.
After having finished the prediction of carrying out for block 0, then sequentially carry out the prediction action for block 1～15.And it is worth mentioning that, in the prediction 650 of carrying out for block 15, because what carry out is last block, therefore, after the prediction 653 of the prediction 652 of the prediction 651 of sequentially having carried out the huge block mode of I8, the huge block mode of I16 and chroma mode, do not need to carry out again the reconstruction of the huge block mode of I8.Reason is to be that block 15 has been last block, so do not need to rebuild and provide the prediction action that information provides next block.
The execution mode that illustrates with Fig. 5 is identical, and after the prediction 650 of the block 15 of having finished the picture frame data, 430 actions 660 of carrying out the relative value function of cost function comparison circuit, and use and select suitable predictive mode.At this, it is then identical in the execution mode that Fig. 5 illustrates to select the action of suitable predictive mode about how according to cost function, seldom gives unnecessary details herein.
Proposing an embodiment with next system of selection for intra-frame prediction mode of the present invention is illustrated.
Below please refer to Fig. 7, Fig. 7 illustrates the flow chart of system of selection of the intra-frame prediction mode of embodiments of the invention.Step wherein comprises: at first, receive respectively compressed configuration and the picture resolution (step S710, S720) of picture frame data.Wherein in encoding and decoding standard H.264, compressed configuration includes main configuration, basic configuration and high configuration.The picture resolution then can be divided into the FULL HD of high-res and the CIF of General Analytical degree.Then, select several corresponding predictive modes according to compressed configuration and picture resolution, and carry out scheduling for these predictive modes, sequentially to calculate and to obtain corresponding cost function (step S730).
Then, then compare according in step S730, calculating several cost functions that obtain, and select one of them next predictive mode (step S740) as the picture frame data of several predictive modes.Relatively the action of several cost functions then is for example to find out in the cost function minimumly, and selects corresponding predictive mode to come predictive mode as the picture frame data.
In sum, the present invention selects corresponding predictive mode according to compression module and the picture resolution of picture frame data, and carries out scheduling for the predictive mode of selecting, and sequentially produces corresponding cost function.Effectively save the resource of hardware, and effectively saved the frequency range of computing.
It should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not limit it, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solution of the present invention.
Claims (2)
1. the system of selection of an intra-frame prediction mode is characterized in that, comprising:
Receive a compressed configuration of a picture frame data, described compressed configuration comprises high configuration, main configuration or basic configuration;
Receive a picture resolution of described picture frame data, described picture resolution comprises high-res or General Analytical degree;
Select several corresponding predictive modes according to described compressed configuration and described picture resolution, and carry out scheduling sequentially calculate to obtain several corresponding cost functions for described several predictive modes, wherein, described several predictive modes comprise the huge block mode of an I4, the huge block mode of an I8, the huge block mode of an I16 and a colourity pattern, wherein, select the step of corresponding described predictive mode to comprise according to described compressed configuration and described picture resolution:
When described compressed configuration is main configuration, and described picture resolution is high-res or General Analytical when spending, and selects the huge block mode of described I4, the huge block mode of described I16 and described chroma mode;
When described compressed configuration is basic configuration, and described picture resolution is selected the huge block mode of described I4, the huge block mode of described I16 and described chroma mode when being General Analytical degree or high-res;
When described compressed configuration is high configuration, and described picture resolution is General Analytical when spending, and selects the huge block mode of described I4, the huge block mode of described I16 and described chroma mode;
And
When described compressed configuration is high configuration, and described picture resolution is selected the huge block mode of described I8, the huge block mode of described I16 and described chroma mode when being high-res;
Wherein, carrying out scheduling for described several predictive modes comprises sequentially to calculate the step that obtains corresponding described cost function:
When described several predictive modes of selecting are described I 4 huge block modes, the huge block mode of described I16 and described chroma mode, wherein carry out the prediction of the huge block mode of described I16 in the prediction time dead when carrying out the prediction of the huge block mode of described I4, and the reconstruction time dead when carrying out the reconstruction of the huge block mode of described I4 is carried out the prediction of described chroma mode; And
When described several predictive modes of selecting are the huge block mode of described I8, the huge block mode of described I16 and described chroma mode, carry out first the prediction of the huge block mode of described I8, carry out again the prediction of the huge block mode of described I16, then carry out again the prediction of described chroma mode, and in the end carry out the reconstruction of the huge block mode of described I8; And
Come predictive mode as described picture frame data according to more described several cost functions with one of them that select described several predictive modes.
2. the choice device of an intra-frame prediction mode is characterized in that, comprising:
One scheduling controller, receive a compressed configuration and a picture resolution of a picture frame data, select several corresponding predictive modes according to described compressed configuration and described picture resolution, and carry out scheduling for described several predictive modes, described compressed configuration comprises high configuration, main configuration or basic configuration, described picture resolution comprises high-res or General Analytical degree, and described several predictive modes comprise the huge block mode of an I4, the huge block mode of an I8, the huge block mode of an I16 and a colourity (chroma) pattern;
One cost function generator connects described scheduling controller, sequentially carries out the prediction of described several predictive modes according to the scheduling that described scheduling controller carries out described several predictive modes, and produces several corresponding cost functions; And
One cost function comparison circuit connects described cost function generator, and more described several cost functions come predictive mode as described picture frame data with one of them that select described several predictive modes,
When described compressed configuration is main configuration, and described picture resolution is when being General Analytical degree or high-res, described scheduling controller is selected the huge block mode of described I4, the huge block mode of described I16 and described chroma mode, when described compressed configuration is basic configuration, and described picture resolution is when being General Analytical degree or high-res, described scheduling controller is selected the huge block mode of described I4, the huge block mode of described I16 and described chroma mode, when described compressed configuration is high configuration, and described picture resolution is that General Analytical is when spending, described scheduling controller is selected the huge block mode of described I4, the huge block mode of described I16 and described chroma mode, when described compressed configuration is high configuration, and when described picture resolution is high-res, described scheduling controller is selected the huge block mode of described I8, the huge block mode of described I16 and described chroma mode, when described several predictive modes of selecting are the huge block mode of described I4, when the huge block mode of described I16 and described chroma mode, described scheduling controller makes the prediction of carrying out the huge block mode of described I16 in the prediction time dead of described cost function generator when carrying out the prediction of the huge block mode of described I4, and the reconstruction time dead when described cost function generator is carried out the reconstruction of the huge block mode of described I4 is carried out the prediction of described chroma mode, when the described predictive mode of selecting is the huge block mode of described I8, when the huge block mode of described I16 and described chroma mode, described scheduling controller makes described cost function generator carry out first the prediction of the huge block mode of described I8, carry out again the prediction of the huge block mode of described I16, then carry out again the prediction of described chroma mode, and in the end carry out the reconstruction of the huge block mode of described I8.
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| US20060126740A1 (en) * | 2004-12-10 | 2006-06-15 | Lin Teng C | Shared pipeline architecture for motion vector prediction and residual decoding |
| CN101273641A (en) * | 2005-09-26 | 2008-09-24 | 三菱电机株式会社 | Dynamic image encoding device and dynamic image decoding device |
| CN101350927A (en) * | 2008-07-29 | 2009-01-21 | 北京中星微电子有限公司 | Method and apparatus for forecasting and selecting optimum estimation mode in a frame |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20060126740A1 (en) * | 2004-12-10 | 2006-06-15 | Lin Teng C | Shared pipeline architecture for motion vector prediction and residual decoding |
| CN101273641A (en) * | 2005-09-26 | 2008-09-24 | 三菱电机株式会社 | Dynamic image encoding device and dynamic image decoding device |
| CN101350927A (en) * | 2008-07-29 | 2009-01-21 | 北京中星微电子有限公司 | Method and apparatus for forecasting and selecting optimum estimation mode in a frame |
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