CN105872538A - Time-domain filtering method and time-domain filtering device - Google Patents
Time-domain filtering method and time-domain filtering device Download PDFInfo
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- CN105872538A CN105872538A CN201610239047.2A CN201610239047A CN105872538A CN 105872538 A CN105872538 A CN 105872538A CN 201610239047 A CN201610239047 A CN 201610239047A CN 105872538 A CN105872538 A CN 105872538A
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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
- H04N19/117—Filters, e.g. for pre-processing or post-processing
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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
- H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
Abstract
The embodiment of the invention provides a time-domain filtering method and a time-domain filtering device. The time-domain filtering method comprises the steps that filtering parameters of time-domain filtering are updated according to encoding parameters of an encoder; time-domain filtering is conducted on filtering blocks by adopting the updated filtering parameters. According to the time-domain filtering method and the time-domain filtering device, self-adaptive time-domain filtering can be achieved according to the encoding parameters of the encoder, therefore, the filtering efficiency of an existing filtering mode is improved, and the calculation complexity of the encoder is reduced to a certain extent.
Description
Technical field
The present invention relates to technical field of video coding, be specifically related to a kind of time-domain filtering method and time-domain filtering
Device.
Background technology
Video quality is most important evaluation index in Video Applications is promoted, but video is in the process gathered
In, because various reason, noise in various degree can be introduced.These noises not necessarily can be by
It is observed visually.Therefore video image enters back into encoder after being typically necessary and being filtered, these filtering
Process includes airspace filter and time-domain filtering etc..
In recent years, in a new generation's video compression standard, in order to improve subjective quality, a series of post processings
Filtering method is developed, such as sao (sample adaptive offset) and alf (adaptive loop
Filter) etc., good effect is the most also achieved.But these post-processing approach are directed to
The noise of encoder generation or deviation, not for input picture noise, the most do not alleviate the pressure of encoder
Power.On the other hand, although the time-space domain of input picture is filtered also have a lot, but all with the volume of encoder
Code process is unrelated, does not has and the coding parameter of encoder organically combines.
Fig. 1 show the schematic flow sheet of a kind of time-domain filtering that prior art provides.Time-domain filtering is general
It is that continuous print incoming frame image is filtered, if it is considered that low latency, backward filtering can not be considered.Example
As, if present image is p (t), previous frame image is p (t-1), then front n-th frame image is p (t-n).
Assuming that a length of n two field picture of time-domain filtering, then the process of time-domain filtering is first from p (t) in fact ...
P (t-n) image is each chosen corresponding match block, then according to p (t) ... each Self Matching in p (t-n) image
The content of block judges p (t) ... the respective filtering weighting of p (t-n) image, finally recycles p (t) ... p (t-n)
In image, respective match block content and respective weight are overlapped computing, thus produce new image
P (t) enters encoder and encodes, and ultimately forms compression image.As can be seen here, of the prior art
Filtering and cataloged procedure are separate, and this will certainly cause, and filtering operation amount is relatively big, filter effect
The problem that rate is low, filtering mode is unreasonable and filter effect is poor.
Summary of the invention
In view of this, embodiments provide a kind of time-domain filtering method and time-domain filtering device, can
Coding parameter according to encoder realizes adaptive time-domain filtering, improves the filter of existing filtering mode
Weave efficiency, reduces the computational complexity of encoder to a certain extent.
A kind of time-domain filtering method that one embodiment of the invention provides includes:
Coding parameter according to encoder updates the filtering parameter of time-domain filtering；And
Use the filtering parameter after described renewal that filter block is carried out time-domain filtering.
Further, include according to the filtering parameter of the coding parameter renewal time-domain filtering of encoder:
Coding parameter according to encoder determines the size of the filter block of time-domain filtering；And/or
The filtering weighting of the match block of the coding parameter correction time-domain filtering according to encoder.
Further, the coding parameter of described encoder includes: encoder carries out segmentation during inter prediction
Unit information；Wherein,
Coding parameter according to encoder determines that the size of the filter block of time-domain filtering includes: according to encoder
Subdivision unit information when carrying out inter prediction determines the size of the filter block of time-domain filtering.
Further, subdivision unit information when carrying out inter prediction according to encoder determines time-domain filtering
The size of filter block includes:
The subdivision unit size that selection encoder carries out using number of times more during inter prediction is as filter block
Size；Or,
Select the bigger subdivision unit size that encoder carries out being used during inter prediction as filter block
Size.
Further, the size of the filter block of described time-domain filtering is not limited to described encoder and carries out frame
Between subdivision unit information when predicting.
Further, the coding parameter of described encoder includes: quantization parameter；Wherein,
The filtering weighting of the match block of the coding parameter correction time-domain filtering according to encoder includes:
The matching error between quantization parameter and described match block and described filter block according to encoder
Revise the degree of similarity of described match block and described filter block；And
Degree of similarity according to described match block Yu described filter block determines the filtering power of described match block
Weight.
Further, according between quantization parameter and described match block and the described filter block of encoder
Described in matching error correction, match block includes with the degree of similarity of described filter block:
Matching error one timing between described match block and described filter block, the quantization of described encoder
Parameter is the biggest, and the most described match block is the highest with the degree of similarity of described filter block；And/or,
When quantization parameter one timing of described encoder, mating between described match block with described filter block
Error is the biggest, and the most described match block is the lowest with the degree of similarity of described filter block.
Further, described match block is determined according to the degree of similarity of described match block Yu described filter block
Filtering weighting include: described match block is the highest with the degree of similarity of described filter block, described match block
Filtering weighting the highest, otherwise, the filtering weighting of described match block is the lowest.
Further, described method farther includes: use fractional pixel interpolation to select described time domain to filter
The match block of ripple.
One embodiment of the invention also provides for a kind of time-domain filtering device, including:
Filtering parameter determines module, updates the filtering ginseng of time-domain filtering for the coding parameter according to encoder
Number；And
Filtration module, the filtering parameter after using renewal carries out time-domain filtering to filter block.
A kind of time-domain filtering method of embodiment of the present invention offer and time-domain filtering device, it is contemplated that time domain is filtered
The filtering of ripple and the cataloged procedure of encoder are all carried out by block, hence with the coding of encoder
The filtering parameter of time-domain filtering is first updated by parameter, then recycles the filtering parameter after updating
It is filtered, it is achieved that the combination of the coding parameter of filtering parameter and encoder, can be according to encoder
Coding parameter realize adaptive time-domain filtering, improve the filtration efficiency of existing filtering mode, one
Determine to reduce in degree the computational complexity of encoder, reduce the pressure of encoder during next code
Power.
Accompanying drawing explanation
Fig. 1 show the schematic flow sheet of a kind of time-domain filtering method that prior art provides.
Fig. 2 show the schematic flow sheet of a kind of time-domain filtering method that one embodiment of the invention provides.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, and not
It it is whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making
The every other embodiment obtained under creative work premise, broadly falls into the scope of protection of the invention.
Fig. 2 show the schematic flow sheet of a kind of time-domain filtering method that one embodiment of the invention provides.As
Shown in Fig. 2, in this time-domain filtering method, it is contemplated that the filtering of time-domain filtering and the volume of encoder
Code process is all carried out by block, therefore updates the filtering of time-domain filtering according to the coding parameter of encoder
Parameter, the filtering parameter after then recycling updates carries out time-domain filtering to filter block.
Specifically, for the two field picture of input continuously, the filtering parameter of the two field picture of initial input can be adopted
Take default value.When the two field picture of this initial input enters encoder through time-domain filtering, and encoder will
Read corresponding coding parameter (such as, the subdivision unit size of inter prediction and quantization parameter etc.) to carry out
Coding, now this coding parameter will be used for updating the filtering parameter of next frame image filtering process.Due to
The content of adjacent two two field pictures typically will not be undergone mutation, and therefore the coding parameter of previous frame image completely may be used
For updating the filtering parameter of next frame image, the filter to continuous incoming frame image the most just can be realized
Constantly determining of wave process.
In an embodiment of the present invention, the time-domain filtering can being determined according to the coding parameter of encoder
Filtering parameter includes: the size of the filter block of time-domain filtering.As previously described, because the filtering of time-domain filtering
The cataloged procedure of process and encoder is all carried out by block, and coding unit in the coding parameter of encoder
Choose typically the most relevant to picture material itself (in such as coding parameter coding unit choose with in image
The size of the object video that texture is the most unified is corresponding), the coding parameter hence with encoder comes really
The big I of filter block of domain filtering improves quality and the efficiency of time-domain filtering, and can reduce next code
The pressure of process.
In a further embodiment, can be to carry out subdivision unit letter during inter prediction according to encoder
Breath determines the size of the filter block of time-domain filtering.Specifically, can first statistical coding device to carry out interframe pre-
The various different subdivision unit used during survey, then according to certain determination principle is according to counting
These subdivision unit determine the size of filter block.In an embodiment of the present invention, this determines that principle comprises the steps that
Choose big as filter block of the subdivision unit size using number of times more when encoder carries out inter prediction
Little, such as from subdivision unit set { block128x128, block 64x64, block 32x32, block
The block type that in 16x16, block 8x8}, selection occurrence number is most is as filter block, thus improves filtering
The efficiency of process.In an alternative embodiment of the invention, this determines that principle may also include that selection encoder enters
The bigger subdivision unit size used during row inter prediction as the size of filter block, determined by filter
Ripple block is the biggest, and the speed of filtering is the fastest.
Should be appreciated that owing to subdivision unit information during encoder inter prediction is according to concrete input picture
Depending on content, above-mentioned determine that the particular content of principle is also dependent on subdivision unit during encoder inter prediction
Information and respective combination or adjustment.Such as, when the subdivision unit size ratio that inter prediction employing number of times is most
The default size of filter block is also wanted hour, in order to ensure certain filtration efficiency, and must silent with filter block
Recognize size to be as the criterion.The most such as, when the subdivision unit size that inter prediction uses number of times most has two kinds,
Then should be with the biggest subdivision unit size for filter block size.Thin to according to inter prediction of the present invention
Subdivision information is used the particular content determining principle not limit when determining filter block size.
It should also be understood that, although in an embodiment of the present invention, determining the filter block size of time-domain filtering
Time subdivision unit information when make use of encoder to carry out inter prediction, but be not meant to time-domain filtering
Filter block size will be limited to subdivision unit information during inter prediction, the filter block size of time-domain filtering
It is likely to beyond subdivision unit information during this inter prediction.Such as, although by adding up this subdivision unit
Information and the most subdivision unit size of number of times that uses that draws is only 16x 16, but due to current filter
Region belonging to block may not be paid close attention to area-of-interest, in order to ensure the efficiency of filtering,
The filter block size of time-domain filtering is still can be more than 16x 16, for example with 32x32.
In an embodiment of the present invention, in order to improve the code efficiency and flexibly of high resolution video image
Property, maximum encoded element information when encoder carries out inter prediction can be preset in coding structure object
In header, wherein, subdivision unit size when encoder carries out inter prediction is compiled less than or equal to this maximum
Code cell size, the header of coding structure object comprises the steps that header or the multiple image of single-frame images
Shared header.Owing to this maximum encoded element information preset is corresponding with code requirement, coding needs
Ask and corresponding with picture material, therefore determine that filter block size also may be used according to this maximum encoded element information
Improve filtration efficiency accordingly, and alleviate the burden of next code.
In an embodiment of the present invention, the time-domain filtering can being determined according to the coding parameter of encoder
Filtering parameter includes: the filtering weighting of the match block of time-domain filtering.Specifically, it is subject to due to filtering weighting
Match block affects with the degree of similarity of filter block, therefore can be according to the coding parameter correction time domain of encoder
The match block of filtering and the degree of similarity of filter block, then determine match block further according to this degree of similarity
Filtering weighting.In an embodiment of the present invention, only full with the degree of similarity of filter block when match block
Just utilize match block that filter block is carried out time-domain filtering during the criterion that foot is preset, otherwise keep filter block
Constant.
In a further embodiment, the coding parameter of encoder includes: quantization parameter, now according to volume
The filtering weighting of the match block of the coding parameter correction time-domain filtering of code device may particularly include: according to encoder
Quantization parameter and match block and filter block between the degree of similarity of matching error correction match block,
I.e. the degree of similarity between match block and filter block is by the quantization parameter of encoder and matching error
Impact, then determines the filtering weighting of match block further according to this degree of similarity.Specifically, coupling is worked as
Matching error one timing between block and filter block, the quantization parameter of encoder is the biggest, then match block and filter
The degree of similarity of ripple block is the highest；When quantization parameter one timing of encoder, between match block and filter block
Matching error the biggest, then match block is the lowest with the degree of similarity of filter block.Meanwhile, match block and filter
The degree of similarity of ripple block is the highest, and the filtering weighting of match block is the highest, otherwise, the filtering weighting of match block
The lowest.
In an embodiment of the present invention, match block can pass through a similitude with the degree of similarity of filter block
Metric parameter characterizes.If the similarity measurement parameter representing match block with S, represent match block with W
Filtering weighting, represent the block size of time-domain filtering with sizeof (block_tf), with qp presentation code device
Quantization parameter, represent the matching error between match block and filter block, the then filtering of match block with dev
Weight is represented by:
W=g (S), S=dev/sizeof (block_tf) * f (qp)；
Wherein, if dev and sizeof (block_tf) calculates size with number of pixels,
What dev/sizeof (block_tf) was realized is normalized in fact.F (qp) represents based on quantization parameter qp
Generating definite value really, the value of qp is the biggest, then the value of f (qp) is the least.G (S) for according to S worth go out
Filtering weighting value.
In above-mentioned formula, matching error one timing between match block and filter block, the amount of encoder
Change parameter the biggest, then the similarity measurement parameter of match block is the least, now explanation match block and filter block
Degree of similarity is the highest；When quantization parameter one timing of encoder, mating between match block with filter block
Error is the biggest, and the similarity measurement parameter of match block is the biggest, and now explanation match block is similar to filter block
Property degree is the lowest.When the value of similarity measurement parameter S is bigger, then explanation match block and filter block it
Between similarity the poorest, now the filtering weighting of match block is the least；Otherwise, the filtering weighting of match block is more
Greatly.
In an embodiment of the present invention, this f (qp) value can be tabled look-up acquisition according to the value of qp, such as following table.
| qp | f |
| 1-30 | 1 |
| 31-40 | 0.9 |
| 41-55 | 0.8 |
| 56- | 0.7 |
The value of g (S) is tabled look-up acquisition also dependent on the value of S, such as following table.
| S | g |
| ≤ 20 | 3 |
| ≤ 40 | 2 |
| ≤ 80 | 1 |
| >80 | 0 |
Should be appreciated that the concrete projected forms of the above-mentioned table for determining f (qp) and g (S) value can basis
Actual filtering demands and formulate, the concrete value of f (qp) and g (S) is also only under same criterion
Relative value.Owing to the function corresponding relation under different criterion is different, f (qp) and g (S) specifically take
Value may be different, and the present invention is to being used for determining the concrete projected forms of the table of f (qp) and g (S) value
Do not limit.
It is also understood that similarity measurement parameter S is to phase between match block and filter block in above-mentioned formula
Like the characteristic manner of property degree also dependent on being actually needed adjustment, such as, can also the mode of 1/S characterize
Degree of similarity between match block and filter block, now the numerical value of 1/S just can be directly proportional to weight W pass
System, the affecting laws of the numerical value of 1/S also can be changed by dev and qp simultaneously.The present invention is to coupling
Between block and filter block, the design parameter forms of characterization of degree of similarity does not limit.
In an embodiment of the present invention, so that the interpolation point between pixel also can be included into filter block
Range of choice in, can use fractional pixel interpolation to select the match block of time-domain filtering, with obtain with filter
The more preferable match block of ripple block similarity.
As can be seen here, use the embodiment of the present invention provide time-domain filtering method, it is achieved that filtering parameter and
The combination of the coding parameter of encoder, such that it is able to the most reasonably filter according to picture material
Ripple.First, the big of subdivision unit information self-adapting filter block during inter prediction can be carried out according to encoder
Little, if selecting filter block the biggest, then computational complexity is the least, and filtering speed is the highest.Second, can be with
The quantization parameter of encoder combines, and can more efficiently remove noise in time domain, reduce volume to a certain extent
During Ma, the number of times of estimation and decision error, improve motion estimation performance, reduces prediction residual
Difference, improves the efficiency of entropy code.Under equal code check, the subjective quality of image can be significantly improved,
Improve the filtration efficiency of existing filtering mode, the computing reducing encoder to a certain extent is complicated
Degree, reduces the pressure of encoder during next code.
It is to be understood that, although thin when above-described embodiment has only related to quantization parameter and inter prediction in describing
Two kinds of coding parameters of subdivision information, but the particular content of coding parameter is not limited to both the above in fact.
In other embodiments of the invention, it is also possible to utilize other coding parameters of encoder to instruct and filtered
Journey, the kind of available coding parameter is not limited by the present invention.
One embodiment of the invention also provides for a kind of time-domain filtering device, including:
Filtering parameter determines module, for determining the filtering ginseng of time-domain filtering according to the coding parameter of encoder
Number；And
Filtration module, for using the filtering parameter after determining that filter block is carried out time-domain filtering.
The teachings of the present invention is also implemented as the computer program product of a kind of computer-readable recording medium
Product, including computer program code, when computer program code is performed by processor, it makes to process
Device can realize time-domain filtering as the embodiment described herein according to the method for embodiment of the present invention
Method.Computer-readable storage medium can be any tangible media, such as floppy disk, CD-ROM, DVD,
Hard disk drive, even network medium etc..
It is to be understood that, although a kind of way of realization the foregoing describing embodiment of the present invention can be to calculate
Machine program product, but the method or apparatus of embodiments of the present invention can by according to software, hardware or
Being implemented in combination in of person's software and hardware.Hardware components can utilize special logic to realize；Software section
Can store in memory, by suitable instruction execution system, such as microprocessor or special designs
Hardware performs.It will be understood by those skilled in the art that above-mentioned method and apparatus can make to use tricks
Calculation machine executable instruction and/or be included in processor control routine realizes, such as such as disk,
The programmable memory of the mounting medium of CD or DVD-ROM, such as read-only storage (firmware)
Or provide such code in the data medium of such as optics or electrical signal carrier.The side of the present invention
Method and device can be by such as super large-scale integration or gate array, such as logic chip, transistor etc.
Semiconductor or the programmable hardware of such as field programmable gate array, programmable logic device etc. set
Standby hardware circuit realizes, it is also possible to realize with the software performed by various types of processors, it is also possible to
Realized by the combination such as firmware of above-mentioned hardware circuit and software.
It is also understood that to not obscure embodiments of the present invention, specification is only crucial to some, not
Technology and feature that must be necessary be described, and may not be capable of some those skilled in the art
Feature explain.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Within the spirit of invention and principle, any amendment of being made, equivalent etc., should be included in the present invention
Protection domain within.
Claims (10)
1. a time-domain filtering method, it is characterised in that including:
Coding parameter according to encoder updates the filtering parameter of time-domain filtering；And
Use the filtering parameter after described renewal that filter block is carried out time-domain filtering.
Time-domain filtering method the most according to claim 1, it is characterised in that according to encoder
Coding parameter updates the filtering parameter of time-domain filtering and includes:
Coding parameter according to encoder determines the size of the filter block of time-domain filtering；And/or
The filtering weighting of the match block of the coding parameter correction time-domain filtering according to encoder.
Time-domain filtering method the most according to claim 2, it is characterised in that described encoder
Coding parameter includes: encoder carries out subdivision unit information during inter prediction；Wherein,
Coding parameter according to encoder determines that the size of the filter block of time-domain filtering includes: according to encoder
Subdivision unit information when carrying out inter prediction determines the size of the filter block of time-domain filtering.
Time-domain filtering method the most according to claim 3, it is characterised in that enter according to encoder
Subdivision unit information during row inter prediction determines that the size of the filter block of time-domain filtering includes:
The subdivision unit size that selection encoder carries out using number of times more during inter prediction is as filter block
Size；Or,
Select the bigger subdivision unit size that encoder carries out being used during inter prediction as filter block
Size.
Time-domain filtering method the most according to claim 3, it is characterised in that described time-domain filtering
The size of filter block be not limited to subdivision unit information when described encoder carries out inter prediction.
Time-domain filtering method the most according to claim 2, it is characterised in that described encoder
Coding parameter includes: quantization parameter；Wherein,
The filtering weighting of the match block of the coding parameter correction time-domain filtering according to encoder includes:
The matching error between quantization parameter and described match block and described filter block according to encoder
Revise the degree of similarity of described match block and described filter block；And
Degree of similarity according to described match block Yu described filter block determines the filtering power of described match block
Weight.
Time-domain filtering method the most according to claim 6, it is characterised in that according to encoder
Match block described in matching error correction between quantization parameter and described match block and described filter block with
The degree of similarity of described filter block includes:
Matching error one timing between described match block and described filter block, the quantization of described encoder
Parameter is the biggest, and the most described match block is the highest with the degree of similarity of described filter block；And/or,
When quantization parameter one timing of described encoder, mating between described match block with described filter block
Error is the biggest, and the most described match block is the lowest with the degree of similarity of described filter block.
Time-domain filtering method the most according to claim 6, it is characterised in that according to described coupling
Block and the degree of similarity of described filter block determine that the filtering weighting of described match block includes: described match block
The highest with the degree of similarity of described filter block, the filtering weighting of described match block is the highest, otherwise, described
The filtering weighting of match block is the lowest.
9. according to described time-domain filtering method arbitrary in claim 1 to 8, it is characterised in that enter
One step includes: use fractional pixel interpolation to select the match block of described time-domain filtering.
10. a time-domain filtering device, it is characterised in that including:
Filtering parameter determines module, updates the filtering ginseng of time-domain filtering for the coding parameter according to encoder
Number；And
Filtration module, the filtering parameter after using renewal carries out time-domain filtering to filter block.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111598806A (en) * | 2020-05-15 | 2020-08-28 | Oppo（重庆）智能科技有限公司 | Image filtering method and device, electronic equipment and storage medium |
| CN113613005A (en) * | 2021-07-30 | 2021-11-05 | 百果园技术(新加坡)有限公司 | Video denoising method and device based on time domain filtering |
| CN113613005B (en) * | 2021-07-30 | 2024-04-19 | 百果园技术(新加坡)有限公司 | Video denoising method and device based on time domain filtering |
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