CN105578181B - The fast intra mode decision and block matching method of screen content compression in a kind of HEVC - Google Patents
The fast intra mode decision and block matching method of screen content compression in a kind of HEVC Download PDFInfo
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- CN105578181B CN105578181B CN201610035012.7A CN201610035012A CN105578181B CN 105578181 B CN105578181 B CN 105578181B CN 201610035012 A CN201610035012 A CN 201610035012A CN 105578181 B CN105578181 B CN 105578181B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/103—Selection of coding mode or of prediction mode
- H04N19/107—Selection of coding mode or of prediction mode between spatial and temporal predictive coding, e.g. picture refresh
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
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Abstract
The fast intra mode decision and block matching method compressed the invention discloses screen content in a kind of HEVC, belong to coding and decoding video field.The method of the present invention includes: in intra mode decision, estimate the background area of present frame, calculate in present frame and previous coded frame the absolute error of same position coding unit and, judge absolute error and the relationship with threshold value, compare in current background frame coding unit depth size in coding unit and former frame, when calculating, every ten frames cutting is primary, meet Rule of judgment, intra mode decision will jump in advance；When carrying out Block- matching, when absolute error and being not desired to, which is managed, is greater than certain value, adjust corresponding step-size in search, i.e., when absolute error and it is sufficiently large when, the settable bigger value of step-size in search, to skip some unnecessary search.This approach reduce the complexity of encoder, block estimation when intra block duplication is improved, it is quite useful in height is text filed.
Description
Technical field
The present invention relates to video coding and decoding technology field, in particular to a kind of screen content compression method, and in particular to one
The fast intra mode decision and block matching method of screen content compression in kind HEVC.
Background technique
After H.264 it/AVC after, in January, 2013, high efficiency Video coding HEVC (High Efficiency Video
Coding) formal to become video encoding standard of new generation.The target of HEVC is relative to high-grade code efficiency H.264/AVC
It doubles, i.e., under the premise of guaranteeing same video quality, reduces by 50% coding bit rate.In order to reach this target,
HEVC coding standard introduces a series of novel coding tool, but the computation complexity of HEVC coding also significantly mentions simultaneously
It rises.
HEVC towards application mainly have a digital storage media, real-time session service, television broadcasting, interactive mode storage matchmaker
Body, monitoring remote video, network media services etc..And screen content compression (Screen content coding) is that HEVC is answered
A kind of new extension.Screen content coding techniques is widely used in many fields, such as Wireless Display, shared screen, empty
Quasi- desktop, long-distance education, video conference, remote desktop etc..
Screen content video is often mixed by natural video frequency, text, graph image, due to comprising more than content and increasingly
Diversification during transmission, will necessarily consume very big network bandwidth simultaneously because image resolution ratio is higher and higher.For
Saving bandwidth improves communication quality, it is necessary to be effectively compressed to screen content video.
Unlike natural video frequency, screen video content contains static sharp edge, unique color etc..Therefore
Intra block duplication (Intra-BC), color template (PLT) mode, adaptive is introduced in HEVC standard based on screen content coding
Motion vector resolution ratio, color conversion etc. are answered, eliminates the redundancy of image by relevant screen content with this.In above method
In, intra block duplication (Intra-BC) and color template (PLT) mode can be obviously improved coding efficiency, also have at the same time
Very high computation complexity.
Intra block duplication (Intra-BC) is a kind of block-matching technique, which can make similar piece of interframe estimation and mend
Technology is repaid using fixed block size, to obtain better code efficiency.The reconstruction regions of intra block duplication search present frame
Substitution searched for the frame previously rebuild in the past, and brought decoder block vector sum compensation residual error.
Color template (PLT) mode is another noticeable screen content coding techniques.It is with color mapping
Mode shows pixel with value seldom in color derivative table or color plate on screen content.Block with high dynamic range
Mapping parameters are converted into certain dynamic range, to be easier to compress.
Since screen content coding uses new technology above, while also increasing the computation complexity of encoder.
Summary of the invention
In view of the above-mentioned defects in the prior art, the object of the present invention is to provide a kind of novel fast intra mode decision and
Block matching method, this method skips some unnecessary calculating when carrying out background detection, to reduce the complexity of encoder
Degree；Meanwhile by the size of step-size in search when adaptive adjustment Block- matching, block estimation when intra block duplication is improved.
In order to achieve the above-mentioned object of the invention, The technical solution adopted by the invention is as follows:
The fast intra mode decision and block matching method of screen content compression in a kind of HEVC, wherein the fast frame
Internal schema decision includes the following steps:
(1) estimate the background area of present frame；
(2) absolute error and SAD of same position coding unit in coding unit and previous coded frame in present frame are calculated；
(3) a threshold value TH is defined, judges the relationship of absolute error and SAD and threshold value TH, if SAD < TH, current volume
Code unit is background；If SAD >=TH, current coding unit is prospect；
(4) if current coded unit is estimated as background, i.e., static, in order to accelerate mode decision process, next
Compare the depth D of current coded unitcWith the depth D of same position coding unit in previous coded framep；
(5) indicate whether the coding unit that depth is d is static using IsBkg (d), if met simultaneously following all
Condition, in addition to color template mode, intra mode decision will jump in advance, and condition is as follows:
A) quantity of frame cannot be divided exactly by 10；
B) coding unit of same position is chosen as the optimization model of frame mode or intra block replication mode；
C) depth that current coded unit is judged as same position coding unit in static and previous coded frame compares
Greatly, i.e. IsBkg (Dc)=true and Dp> Dc；Or same position coding unit depth is smaller in previous coded frame, Dp< Dc
And IsBkg (Dp)=true；
The block matching method includes the following steps:
(6) in two-dimensional search algorithm, searching position x=x+dx；X indicates horizon scan position herein, and dx indicates original
Step-size in search, dx are set as 1 or 2；
(7) after search for each time, compare value and the preset threshold TH of absolute error and SAD to decide whether to shift to an earlier date
Terminate search process；
(8) if SAD > α SAD0, the correspondingly size of adjusting step dx；Wherein, SAD0Indicate absolute error and SAD sequence
In m-th minimum value, α be current coded unit in pixel number.
Compared with prior art, the present invention having following technical effect that the method for the invention realizes intra mode decisions
The time of process accelerates, and Block- matching speed when intra block duplication is improved using a quick step sizes adjustable strategies.
Compared with algorithm in existing reference software SCM3.0, method performance of the invention is significantly promoted.For lossless compression, reduce
35% scramble time, bit rate only increase by 0.2%；For lossy compression, reduce for 39% scramble time, bit rate is only
Increase by 0.7%.The present invention improves coding rate, reduces the scramble time, accelerates intra block matching speed, can obtain compared with
Good code efficiency.This technology is quite useful in height is text filed.
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description simply to introduce, it should be apparent that, the accompanying drawings in the following description is only this hair
Bright some embodiments for those of ordinary skill in the art, can be with root under the premise of not paying creative labor
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is decision-making mode flow chart in fast frame of the present invention；
Fig. 2 is that coding unit CU depth of the present invention divides schematic diagram.
Specific embodiment
Below with reference to example, the present invention is described in further detail, it is necessary to, it is noted that example below is only used
In the present invention is described further, it should not be understood as limiting the scope of the invention, fields are skillful at people
Member makes some nonessential modifications and adaptations to the present invention and is embodied according to foregoing invention content, should still fall within this
The protection scope of invention.
In HEVC coding standard, as shown in Fig. 2, dividing coding unit, recurrence in the form of quaternary tree recurrence piecemeal
Piecemeal division can effectively be directed to different characteristics of image, be such as directed to smooth region, big piecemeal, such as 64x64 can be used；Needle
To details area, fine piecemeal, such as 8x8 can be used.The division each time of coding unit CU all corresponds to corresponding depth, compiles
The depth prediction of code unit CU is widely used in frame or in inter mode decision.For example, current coded unit CU
Depth and spatial depth and adjacent coding unit depth have relationship, and it is pre- to do coding unit CU depth to can use this point
It surveys.I.e. after the range of CU has exceeded estimation range, CU other than range is not detected, in this way when calculating, so that it may
Reduce encoder complexity.Meanwhile two adjacent coding unit CU be it is very similar, such as in background area, adjacent volume
The depth of code unit CU is very close.Briefly, image can be divided into foreground area and background area from structure, usually carry on the back
Scene area be it is static, do not move, motion vector 0.In typical screen content coding application sequence, be much by
Background area is constituted, therefore the present invention proposes a kind of fast frame internal model of screen content compression on the basis of based on background detection
Formula decision-making technique, then proposes block matching method on this basis.Intra prediction performance is promoted in terms of the two, firstly,
By the time related information in coding unit, a kind of fast coding unit forecasting mechanism is invented；Secondly, in Block- matching frame
When block replicates, acceleration processing is carried out with adaptive searching step size, reduces time loss.
One, specific step is as follows for fast intra mode decision:
Step 1: according to existing research work, estimating the background area of current encoded frame；
Step 2: calculating the absolute mistake of same position coding unit CU in coding unit CU and previous coded frame in present frame
Difference and SAD, calculation formula are
In formula, i, j are coordinate position of the pixel in piecemeal, PcFor picture of the current coded unit CU on the position (i, j)
Element value, PpFor pixel value of the same position coding unit CU on the position (i, j) in previous coded frame, | | indicate absolute value；
Step 3: defining a threshold value TH, threshold value TH calculation formula are as follows:
TH=γ * α
Wherein α is pixel number in current CU, and γ is to calculate the factor, it is proposed that is set as 2.
Step 4: judging the relationship of absolute error and SAD and threshold value TH, if SAD < TH, current coding unit CU is background
Region；If SAD >=TH, current coding unit CU is foreground area；The background area of coded frame is obtained as a result,.
Step 5: if the coding unit CU currently calculated is estimated as background area (stagnant zone), this part area
New algorithm calculation code can be used in domain.It is related that depth block adjacent thereto is divided due to coding unit depth, is connect down
To compare the depth (D of current coded unit CUc) with previous coded frame in same position coding unit CU depth (Dp)；Simultaneously
Indicate whether the coding unit CU that depth is d is static using IsBkg (d).In order to avoid the accumulation of error, Continuous plus
When the cutting of every ten frame it is primary；When current depth intra mode decision process meets the following conditions, can jump (PLT mode in advance
Except):
(1) quantity of frame cannot be divided exactly by 10, i.e. Num%10 ≠ 0；
(2) the coding unit CU of same position is chosen as the optimization model of frame mode or intra block replication mode；
(3) current coded unit CU bigger, the i.e. IsBkg that is judged as static and same position coding unit CU depth
(Dc)=true and Dp> Dc；Or same position coding unit CU depth is smaller in previous coded frame, i.e. Dp< DcAnd IsBkg
(Dp)=true.
Two, specific step is as follows for block matching method:
In existing two-dimensional search algorithm, horizon scan position x=x+dx, x indicates that searching position, dx indicate just herein
Beginning step-size in search, dx initial value are 1 or 2.It is relatively more exhausted if intermediate search results are good enough after search for each time
Error amount SAD and preset threshold are decided whether to terminate search process in advance.In our algorithm, as absolute error value SAD
When undesirable, if SAD > α SAD0, the size of corresponding adjusting step dx；SAD0Indicate the m-th minimum value in SAD sequence；
If SAD > α SAD0, the size of dx is adjusted according to the value of α dynamic, is dx ' after adjustment,
As dx=1:
(1) if SAD > 2SAD0, dx '=2, (2) are if SAD > 4SAD0, dx '=4；
As dx=2:
(1) if SAD > 2SAD0, dx '=4, (2) are if SAD > 4SAD0, dx '=6.
The method of the present invention is described further below with reference to example:
In order to assess decision-making technique in screen content coding fast frame, HEVC reference software SCM 3.0 is used.Modify SCM
3.0 identifying codes add algorithm proposed by the invention.When carrying out test sample, all lossy coding and lossless coding
Test is configured using All Intra (AI), sample sequence of the screen content cycle tests in JCT-VC tissue, their generations
The typical screen content application scenarios of table.If TGM (text and figure of movement), AMT (animated content), MIX are (in mixing
Hold), CAC (camera capture) etc..Meanwhile the sequence of rgb format is indicated with TGM-G, TGM-Y indicates the sequence of YCbCr format.Have
Experimental result is shown in Tables 1 and 2s for the BD-Rate performance and scramble time of damage coding and lossless coding.
The estimation of screen content coding efficiency is damaged when table 1 is using the method for the present invention
Lossless screen content coding efficiency is estimated when table 2 is using the method for the present invention
It can be found that using one quickly the method for the invention realizes the acceleration of the time of intra mode decision process
Step sizes adjustable strategies improve Block- matching speed when intra block duplication.With algorithm phase in existing reference software SCM3.0
Than algorithm performance of the invention is significantly promoted.For lossless compression, reduce for 35% scramble time, bit rate only increases
0.2%；For lossy compression, reduce for 39% scramble time, bit rate only increases by 0.7%.The present invention improves coding speed
Degree, reduces the scramble time, accelerates intra block matching speed, can obtain preferable code efficiency.
Claims (4)
1. screen content compresses in a kind of HEVC fast intra mode decision and block matching method, which is characterized in that described fast
Fast intra mode decision includes the following steps:
(1) estimate the background area of present frame；
(2) absolute error and SAD of same position coding unit in coding unit and previous coded frame in present frame are calculated；
(3) a threshold value TH is defined, judges the relationship of absolute error and SAD and threshold value TH, if SAD < TH, current coding list
Member is background；If SAD >=TH, current coding unit is prospect；
(4) if current coded unit is estimated as background, i.e., static, in order to accelerate mode decision process, next relatively
The depth D of current coded unitcWith the depth D of same position coding unit in previous coded framep；
(5) indicate whether the coding unit that depth is d is static using IsBkg (d), if met simultaneously all following
Part, in addition to color template mode, intra mode decision will jump in advance, and condition is as follows:
A) quantity of frame cannot be divided exactly by 10；
B) coding unit of same position is chosen as the optimization model of frame mode or intra block replication mode；
C) current coded unit be judged as same position coding unit in static and previous coded frame depth it is bigger, i.e.,
IsBkg(Dc)=true and Dp> Dc；Or same position coding unit depth is smaller in previous coded frame, Dp< DcAnd
IsBkg(Dp)=true；
The block matching method includes the following steps:
(6) in two-dimensional search algorithm, searching position x=x+dx；X indicates horizon scan position herein, and dx indicates initial search
Step-length, dx are set as 1 or 2；
(7) after search for each time, compare value and the preset threshold TH of absolute error and SAD to decide whether to terminate in advance
Search process；
(8) if SAD > α SAD0, the correspondingly size of adjusting step dx；Wherein, SAD0It indicates in absolute error and SAD sequence
M-th minimum value, α are the pixel number in current coded unit；Step-length after adjusting step dx is dx ',
When α value is 2:
As dx=1: if SAD > 2SAD0, dx '=2；
As dx=2: if SAD > 2SAD0, dx '=4；
When α value is 4:
As dx=1: if SAD > 4SAD0, dx '=4；
As dx=2: if SAD > 4SAD0, dx '=6.
2. screen content compresses in a kind of HEVC according to claim 1 fast intra mode decision and Block- matching side
Method, which is characterized in that in the step (2), the calculation formula of absolute error sum is as follows:
In formula, i, j are coordinate position of the pixel in piecemeal, PcFor pixel value of the current coded unit on the position (i, j), Pp
For pixel value of the same position coding unit on the position (i, j) in previous coded frame, | | indicate absolute value.
3. screen content compresses in a kind of HEVC according to claim 1 fast intra mode decision and Block- matching side
Method, which is characterized in that in the step (3), the calculation formula of threshold value TH is as follows:
TH=γ * α
Wherein, α is pixel number in current coded unit, and γ is a factor, is set as 2.
4. screen content compresses in a kind of HEVC according to claim 1 fast intra mode decision and Block- matching side
Method, which is characterized in that in the step (4), in order to avoid the accumulation of error, when Continuous plus, every ten frames cutting was primary.
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| US10887626B2 (en) * | 2016-05-13 | 2021-01-05 | Sharp Kabushiki Kaisha | Image decoding device and image encoding device |
| CN106231214B (en) * | 2016-08-11 | 2020-04-21 | 复旦大学 | High-speed CMOS sensor image approximate lossless compression method based on adjustable macro block |
| CN106534846B (en) * | 2016-11-18 | 2019-01-29 | 天津大学 | A kind of screen content and natural contents divide and fast encoding method |
| AU2018230328B2 (en) * | 2017-03-10 | 2021-05-06 | Hfi Innovation Inc. | Method and apparatus of implicit intra coding tool settings with intra directional prediction modes for video coding |
| CN112203087B (en) * | 2020-09-18 | 2021-05-14 | 广州佰锐网络科技有限公司 | HEVC intra-frame prediction mode rapid selection method and system |
| CN112804528B (en) * | 2021-02-05 | 2022-10-28 | 北京字节跳动网络技术有限公司 | Screen content processing method, device and equipment |
| CN114125442B (en) * | 2022-01-29 | 2022-05-03 | 腾讯科技（深圳）有限公司 | Screen video coding mode determining method, coding method, device and computing equipment |
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