CN103248892A - Method and device for intra-frame prediction - Google Patents
Method and device for intra-frame prediction Download PDFInfo
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- CN103248892A CN103248892A CN201310163626XA CN201310163626A CN103248892A CN 103248892 A CN103248892 A CN 103248892A CN 201310163626X A CN201310163626X A CN 201310163626XA CN 201310163626 A CN201310163626 A CN 201310163626A CN 103248892 A CN103248892 A CN 103248892A
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Abstract
The invention discloses a method and a device for intra-frame prediction. The method comprises the following contents: defining a straight line according to the direction of the intra-frame prediction and the position of a to-be-forecasted pixel; selecting the surrounding pixel of A which is an intersection of the line and the coded pixel as a reference pixel; conducting the intra-frame prediction on the base of an original value of the reference pixel; and forecasting that an adopted filter coefficient is related to the distance between the A and the refer pixel. Through the design of the reasonable intra-frame prediction method, the pixel value of the intra-frame prediction is closer to the original pixel; the problems that the forecasting is inaccurate and the entropy coding is redundant, as only the simple forecasting technology is applied for a multi-direction intra-frame prediction are solved; and the more accurate forecasting value can be obtained. Therefore, the residual error of the forecasting is reduced, and the coding efficiency is improved.
Description
Technical field
The present invention relates to multimedia video encoding and decoding technique field, relate in particular to a kind of method of intra-prediction and device.
Background technology
In video sequence, there are four kinds of redundancies: time domain redundancy, spatial domain redundancy, visual redundancy, coding redundancy.For preceding two kinds of redundancies, we generally adopt Predicting Technique to reduce this redundancy.By the difference of prediction mode, the predictive mode of predicting unit can be divided into infra-frame prediction and inter prediction.Wherein, infra-frame prediction refers to only utilize the spatial information (si) of present frame to carry out predictive coding; Inter prediction then refers to, utilizes the time-domain information of consecutive frame to carry out predictive coding.In general, the accuracy of inter prediction will be far above infra-frame prediction, but for also not having time-domain information or can not find in time domain for the encoding block of match block, infra-frame prediction just seems and is even more important.For example, for first frame of a sequence, the perhaps random access point in the cataloged procedure, they can not be with reference to the information on the time domain, and can only adopt the information of present frame to carry out infra-frame prediction.And the coding efficiency of the frame of sequence first frame or random access point is even more important to the coding efficiency of whole sequence.Because they, can influence the right coding of subsequent frame as the references object of follow-up inter prediction.So infra-prediction techniques has very consequence in the video coding exactly.
In existing announced video encoding standard, as H.264, AVS1.0, its frame mode has only 9 kinds at most, and (direction prediction adds a kind of DC pattern in 8, as shown in Figure 1); Prediction direction is less, and simple interpolation prediction method has been enough to satisfy existing demand.Yet in efficient video coding standard and AVS standard A VS2.0 of future generation, intra prediction mode has been increased to kind more than 30.If still use original simple forecast method, the predicted value that makes a large amount of predictive modes obtain is similar, not only do not reach the purpose of accurate prediction, also increased the redundancy of pattern-coding.
Summary of the invention
In order to overcome the deficiency of prior art structure, the invention provides a kind of method of intra-prediction and device.
The embodiment of the invention discloses a kind of intra-frame prediction method, may further comprise the steps:
For an intraprediction unit of input, according to intra prediction direction and the locations of pixels to be predicted set, be chosen as the required reference pixel of infra-frame prediction of carrying out this direction;
Use described reference pixel to described predicting unit, predict that by the prediction direction of setting obtain the pixel predictors of predicting unit, described pixel predictors is carried out filtering by selected reference pixel and obtained.
Further, as preferably, the intra prediction direction that sets each pixel by predicting unit is prolonged the A that intersects at encoded pixels, A point related whole pixel is on every side namely elected reference pixel A as
1, A
2..., A
n, n is more than or equal to 1.
Further, as preferably, the predicted pixel values of predicting unit is by selected reference pixel A
1, A
2..., A
nA filtering of original value obtain, reference pixel is not carried out filtering in advance.
Further, as preferably, the filter that filtering is adopted is the filter (c of a n tap
1, c
2... c
n), the value of n is consistent with the number of selected reference pixel.
Further, as preferably, c
1, c
2... c
nValue and the A point apart from selected reference pixel A
1, A
2..., A
nApart from l
1, l
2... l
nRelevant, l is more big, and c is more little.
Further, as preferably, described filtering is specially: the 4tap filtering interpolation, this filter coefficient value is respectively [1-k, 2-k, 1+k, k]/4, wherein k be the straight line of location of pixels to be predicted and the straight-line intersection left side, reference pixel place or following reference image vegetarian refreshments from the distance of straight line and the reference pixel place straight-line intersection of location of pixels to be predicted, the span of k is [0,1].
Further, as preferably, the k in the filter coefficient can be its actual range, also can be that actual range clip is to the distance of a certain precision, as 1/32 precision etc.
Further, as preferably, when the straight line of location of pixels to be predicted and reference pixel place straight-line intersection A are the point of a whole pixel, namely k be 0 or the filter of 1,4tap be degenerated to the filter of a 3tap, filter coefficient is [1,2,1].
On the other hand, the embodiment of the invention also provides a kind of device of infra-frame prediction, and this device comprises:
The reference pixel selected cell selects to carry out the needed reference pixel of forecasting process according to predictive mode;
Predicting unit predicted value acquiring unit according to the position at prediction direction and current predict pixel place, is selected the prediction needed reference pixel of current pixel value and carries out the filtering interpolation process to obtain predicted value.
Preferably, described reference pixel selected cell prolongs the A that intersects at encoded pixels with the intra prediction direction that sets each pixel by predicting unit, and A point related whole pixel is on every side namely elected reference pixel A1, A as
2..., A
4
Preferably, described predicting unit predicted value acquiring unit, predicted pixel values is by selected reference pixel A
1, A
2..., A
4A filtering of original value obtain, reference pixel is not carried out filtering in advance.Described 4tap filtering interpolation, this filter coefficient value is respectively [1-k, 2-k, 1+k, k]/4, wherein k be the straight line of location of pixels to be predicted and the straight-line intersection left side, reference pixel place or following reference image vegetarian refreshments from the distance of straight line and the reference pixel place straight-line intersection of location of pixels to be predicted, the span of k is [0,1].
Preferably, the k in the described filter can be its actual range, also can be actual range clip to the distance of a certain precision, as 1/32 precision etc.
The present invention makes the pixel value of infra-frame prediction more close to original pixels by a kind of rational intra-frame prediction method of design, solved adopt in the multi-direction infra-frame prediction forecasting inaccuracy that simple Predicting Technique causes really, the problem of entropy coding redundancy.The present invention can obtain the more accurate prediction value, thereby has reduced the residual error of prediction, has improved code efficiency.
Description of drawings
Fig. 1 is prior art intra prediction direction schematic diagram.
Fig. 2 is embodiment of the invention intra-frame prediction method flow chart.
Fig. 3 obtains schematic diagram for reference pixel in the multidirectional infra-frame prediction coding/decoding method of the embodiment of the invention.
Fig. 4 obtains schematic diagram for predicted pixel values in the multidirectional intra-frame prediction method of the embodiment of the invention.
Fig. 5 is embodiment of the invention infra-frame prediction apparatus structure schematic diagram.
Embodiment
When considered in conjunction with the accompanying drawings, pass through following detailed, can more completely understand the present invention better and learn wherein many attendant advantages easily, but accompanying drawing described herein is used to provide further understanding of the present invention, constitute a part of the present invention, illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not constitute improper restriction of the present invention.
For above-mentioned purpose, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with Fig. 3-6 and embodiment.
As shown in Figure 2, a kind of intra-frame prediction method may further comprise the steps:
S21, be that described intra prediction mode is selected the needed reference pixel of prediction;
S22, obtain the predicted value of predicting unit with the prediction of described reference pixel;
Be illustrated in figure 3 as reference pixel and obtain schematic diagram.Filtering interpolation schematic diagram in being illustrated in figure 4 as.
Preferably, each pixel that reference pixel is the intra prediction direction that sets by predicting unit prolongs the A that intersects at encoded pixels, and A point is related whole pixel A on every side
1, A
2..., A
n, n is more than or equal to 1.
Preferably, the predicted pixel values of predicting unit is by selected reference pixel A
1, A
2..., A
nA filtering of original value obtain, reference pixel is not carried out filtering in advance.
Preferably, the filter that filtering is adopted be a n tap filter (c1, c2 ... cn), the value of n is consistent with the number of selected reference pixel.c
1, c
2... c
nValue and the A point apart from selected reference pixel A
1, A
2..., A
nApart from l
1, l
2... l
nRelevant, l is more big, and c is more little.
Preferably, can adopt the 4tap filtering interpolation, this filter coefficient value is respectively [1-k, 2-k, 1+k, k]/4, wherein k is that the straight line of location of pixels to be predicted and the straight-line intersection left side, reference pixel place or following reference image vegetarian refreshments are from the distance of straight line and the reference pixel place straight-line intersection of location of pixels to be predicted, the span of k is [0,1].When the straight line of location of pixels to be predicted and reference pixel place straight-line intersection A were the point of a whole pixel, namely k was 0 or M, and the filter of 4tap is degenerated to the filter of a 3tap, and filter coefficient is [1,2,1].
Preferably, the k in the described filter can be its actual range, also can be actual range clip to the distance of a certain precision, as 1/32 precision etc.
As shown in Figure 5, be embodiment of the invention infra-frame prediction apparatus structure schematic diagram, this device comprises:
Reference pixel selected cell 51 is used for the needed reference pixel of a kind of intra prediction mode selection prediction for the predicting unit of coding side;
Predicting unit predicted value acquiring unit 52 is used for adopting described intra prediction mode that each pixel of described predicting unit is obtained predicted value;
Preferably, described reference pixel selected cell prolongs the A that intersects at encoded pixels with the intra prediction direction that sets each pixel by predicting unit, and A point related whole pixel is on every side namely elected reference pixel A as
1, A
2..., A
n, n is more than or equal to 1.
Preferably, described predicting unit predicted value acquiring unit, predicted pixel values be by selected reference pixel A1, A2 ..., An a filtering of original value obtain, reference pixel is not carried out filtering in advance.
Preferably, the filter that adopts of filtering is the filter (c of a n tap
1, c
2... c
n), the value of n is consistent with the number of selected reference pixel.c
1, c
2... c
nValue and the A point apart from selected reference pixel A
1, A
2..., A
nApart from l
1, l
2... l
nRelevant, l is more big, and c is more little.
Preferably, adopt the 4tap filtering interpolation, this filter coefficient value is respectively [1-k, 22-k, 1+k, k]/4, wherein k is that the straight line of location of pixels to be predicted and the straight-line intersection left side, reference pixel place or following reference image vegetarian refreshments are from the distance of straight line and the reference pixel place straight-line intersection of location of pixels to be predicted, the span of k is [0,1].When the straight line of location of pixels to be predicted and reference pixel place straight-line intersection A are the point of a whole pixel, namely k be 0 or the filter of 1,4tap be degenerated to the filter of a 3tap, filter coefficient is [1,2,1].
Preferably, the k in the described filter can be its actual range, also can be actual range clip to the distance of a certain precision, as 1/32 precision etc.
Experimental result:
The embodiment of the invention is in the reference software of RD2.0(AVS2 standard) technology of finishing realizes.In experiment, adopt the universal test condition of AVS2, testing length is the 10s sequence, full I frame configuration.Experiment porch is Intel (R) Xeon (R) CPU X56602.80GHZ2.79GHZ23.9G internal memory.The coding efficiency of the multi-direction intra-frame predictive encoding method among the present invention is adopted in table 1 expression.ClassA, ClassB, ClassC, ClassD, ClassE represent respectively resolution be (3840x2160,2560x1600), the test order of 1920x1080,832x480,416x240,1280x720.The tolerance of coding efficiency adopts BD-rate, and namely the code check under the situation of same-code quality is saved.From experimental result, adopt embodiment of the invention such scheme, with respect to the original encoding device, when the same-code quality, on average save 1.7% code check.
Table 1. performance relatively
Those skilled in the art can also recognize that various illustrative components, blocks (illustrative logical block), unit and step that the embodiment of the invention is listed can pass through electronic hardware, computer software, or both combinations realize.Be the clear replaceability of showing hardware and software
(interchangeability), above-mentioned various illustrative components (illustrative components), unit and step have been described their function generally.Such function is to realize depending on the designing requirement of specific application and whole system by hardware or software.Those skilled in the art can be for every kind of specific application, and can make ins all sorts of ways realizes described function, but this realization should not be understood that to exceed the scope of embodiment of the invention protection.
Various illustrative logical block described in the embodiment of the invention, or the unit can pass through general processor, digital signal processor, application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the design of above-mentioned any combination realizes or operates described function.General processor can be microprocessor, and alternatively, this general processor also can be any traditional processor, controller, microcontroller or state machine.Processor also can realize by the combination of calculation element, for example digital signal processor and microprocessor, a plurality of microprocessors, Digital Signal Processor Core of one or more microprocessors associatings, or any other similarly configuration realize.
Method described in the embodiment of the invention or the step of algorithm can directly embed hardware, the software module of processor execution or the two combination.Software module can be stored in the storage medium of other arbitrary form in RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or this area.Exemplarily, storage medium can be connected with processor, so that processor can read information from storage medium, and can deposit write information to storage medium.Alternatively, storage medium can also be integrated in the processor.Processor and storage medium can be arranged among the ASIC, and ASIC can be arranged in the user terminal.Alternatively, processor and storage medium also can be arranged in the different parts in the user terminal.
In one or more exemplary designs, the described above-mentioned functions of the embodiment of the invention can realize in hardware, software, firmware or this three's combination in any.If realize in software, these functions can be stored on the media with computer-readable, or are transmitted on the media of computer-readable with one or more instructions or code form.The computer-readable media comprises the computer storage medium and is convenient to make allows computer program transfer to other local communication medium from a place.Storage medium can be the useable medium that any general or special computer can access.For example, such computer readable media can include but not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or other anyly can be used for carrying or storage can be read the program code of form by general or special computer or general or special processor with instruction or data structure and other media.In addition, any connection can suitably be defined as the computer-readable media, for example, if software is by a coaxial cable, optical fiber computer, twisted-pair feeder, Digital Subscriber Line (DSL) or also being comprised in the defined computer-readable media with wireless mode transmission such as for example infrared, wireless and microwaves from a web-site, server or other remote resource.Described video disc (disk) and disk (disc) comprise Zip disk, radium-shine dish, CD, DVD, floppy disk and Blu-ray Disc, and disk is usually with the magnetic duplication data, and video disc carries out the optical reproduction data with laser usually.Above-mentioned combination also can be included in the computer-readable media.
Though more than described the specific embodiment of the present invention, but those skilled in the art is to be understood that, these embodiments only illustrate, those skilled in the art can carry out various omissions, replacement and change to the details of said method and system under the situation that does not break away from principle of the present invention and essence.For example, merge the said method step, then belong to scope of the present invention thereby carry out the essence identical functions according to the identical method of essence to realize the identical result of essence.Therefore, scope of the present invention is only limited by appended claims.
Claims (8)
1. a method of intra-prediction is characterized in that, may further comprise the steps:
For an intraprediction unit of input, according to the intra prediction direction of setting, be chosen as the required reference pixel of infra-frame prediction of carrying out this direction;
Use described reference pixel to described predicting unit, predict by the prediction direction of setting, obtain the pixel predictors of predicting unit.
2. intra-frame prediction method according to claim 1 is characterized in that, the intra prediction direction that sets each pixel by predicting unit is prolonged the A that intersects at encoded pixels, and A point related whole pixel is on every side namely elected reference pixel A as
1, A
2..., A
n, n is more than or equal to 1.
3. root intra-frame prediction method according to claim 1 is characterized in that, the predicted pixel values of predicting unit is by selected reference pixel A
1, A
2..., A
nA filtering of original value obtain, reference pixel is not carried out filtering in advance.
4. root intra-frame prediction method according to claim 3 is characterized in that, the filter that filtering is adopted is the filter (c of a n tap
1, c
2... c
n), the value of n is consistent with the number of selected reference pixel.
5. intra-frame prediction method according to claim 4 is characterized in that, described filter c
1, c
2... c
nValue and the A point apart from selected reference pixel A
1, A
2..., A
nApart from l
1, l
2... l
nRelevant, l is more big, and c is more little.
6. root is according to claim 4 or 5 described intra-frame prediction methods, it is characterized in that, described filtering is specially: the 4tap filtering interpolation, this filter coefficient value is respectively [1-k, 2-k, 1+k, k]/4, wherein k be the straight line of location of pixels to be predicted and the straight-line intersection left side, reference pixel place or following reference image vegetarian refreshments from the distance of straight line and the reference pixel place straight-line intersection of location of pixels to be predicted, the span of k is [0,1].K in the filter coefficient can be its actual range, also can be that actual range clip is to the distance of a certain precision.The precision of k is relevant with the precision of direction.
7. root intra-frame prediction method according to claim 6, it is characterized in that, the infra-frame prediction decoding method is: when the straight line of location of pixels to be predicted and reference pixel place straight-line intersection A are the point of a whole pixel, be that k is 0 or 1, the filter of 4tap is degenerated to the filter of a 3tap, filter coefficient is [1,2,1].
8. multi-direction infra-frame prediction device, this device comprises:
The reference pixel selected cell selects to carry out the needed reference pixel of forecasting process according to predictive mode;
Predicting unit predicted value acquiring unit according to the position at prediction direction and current predict pixel place, is selected the prediction needed reference pixel of current pixel value and carries out the filtering interpolation process to obtain predicted value.
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| CN107743705A (en) * | 2015-06-18 | 2018-02-27 | 高通股份有限公司 | Infra-frame prediction and frame mode decoding |
| CN110650349A (en) * | 2018-06-26 | 2020-01-03 | 中兴通讯股份有限公司 | Image encoding method, decoding method, encoder, decoder and storage medium |
| CN110944211A (en) * | 2019-11-15 | 2020-03-31 | 腾讯科技（深圳）有限公司 | Interpolation filtering method, device, medium and electronic device for intra-frame prediction |
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| US10841593B2 (en) | 2015-06-18 | 2020-11-17 | Qualcomm Incorporated | Intra prediction and intra mode coding |
| CN112040228A (en) * | 2018-09-16 | 2020-12-04 | 华为技术有限公司 | Method and apparatus for prediction |
| US11277644B2 (en) | 2018-07-02 | 2022-03-15 | Qualcomm Incorporated | Combining mode dependent intra smoothing (MDIS) with intra interpolation filter switching |
| US11303885B2 (en) | 2018-10-25 | 2022-04-12 | Qualcomm Incorporated | Wide-angle intra prediction smoothing and interpolation |
| US11463689B2 (en) | 2015-06-18 | 2022-10-04 | Qualcomm Incorporated | Intra prediction and intra mode coding |
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| CN107743705A (en) * | 2015-06-18 | 2018-02-27 | 高通股份有限公司 | Infra-frame prediction and frame mode decoding |
| US10841593B2 (en) | 2015-06-18 | 2020-11-17 | Qualcomm Incorporated | Intra prediction and intra mode coding |
| US11463689B2 (en) | 2015-06-18 | 2022-10-04 | Qualcomm Incorporated | Intra prediction and intra mode coding |
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| US11277644B2 (en) | 2018-07-02 | 2022-03-15 | Qualcomm Incorporated | Combining mode dependent intra smoothing (MDIS) with intra interpolation filter switching |
| US11647185B2 (en) | 2018-09-16 | 2023-05-09 | Huawei Technologies Co., Ltd. | Method and apparatus for filtering with directional prediction |
| CN112040228A (en) * | 2018-09-16 | 2020-12-04 | 华为技术有限公司 | Method and apparatus for prediction |
| US11303885B2 (en) | 2018-10-25 | 2022-04-12 | Qualcomm Incorporated | Wide-angle intra prediction smoothing and interpolation |
| WO2020103931A1 (en) * | 2018-11-22 | 2020-05-28 | Beijing Bytedance Network Technology Co., Ltd. | Pulse code modulation technique in video processing |
| US11743453B2 (en) | 2018-11-22 | 2023-08-29 | Beijing Bytedance Network Technology Co., Ltd | Pulse code modulation technique in video processing |
| US11095882B2 (en) | 2018-11-22 | 2021-08-17 | Beijing Bytedance Network Technology Co., Ltd. | Pulse code modulation technique in video processing |
| CN110944211A (en) * | 2019-11-15 | 2020-03-31 | 腾讯科技（深圳）有限公司 | Interpolation filtering method, device, medium and electronic device for intra-frame prediction |
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