CN110337812A - The method, apparatus and computer system of loop filtering - Google Patents
The method, apparatus and computer system of loop filtering Download PDFInfo
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- CN110337812A CN110337812A CN201880012509.4A CN201880012509A CN110337812A CN 110337812 A CN110337812 A CN 110337812A CN 201880012509 A CN201880012509 A CN 201880012509A CN 110337812 A CN110337812 A CN 110337812A
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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
- H04N19/10—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
- H04N19/176—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 the region being a block, e.g. a macroblock
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- H—ELECTRICITY
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/80—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
- H04N19/82—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation involving filtering within a prediction loop
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Abstract
A kind of method, apparatus and computer system of loop filtering.This method comprises: determining the first mapping mode (410) in a variety of mapping modes；Determine the corresponding first threshold (420) of first mapping mode；According to first mapping mode and the first threshold, image block to be filtered is filtered, obtains reconstruction image block (430).It can be improved the performance of loop filtering by the above method.
Description
Copyright notice
This patent document disclosure includes material protected by copyright.The copyright is all for copyright holder.Copyright
Owner does not oppose the patent document in the presence of anyone replicates the proce's-verbal of Patent&Trademark Office and archives or should
Patent discloses.
Technical field
The present invention relates to coding and decoding video fields, and more particularly, to the method, apparatus and meter of a kind of loop filtering
Calculation machine system.
Background technique
Loop filtering is the key component in coding and decoding video frame.It is mainly used for reducing the block generated in cataloged procedure
The compression artefacts such as effect, ringing effect.Have in loop filtering technology block-based loop filtering technology and based on image it is non local
The loop filtering technology of similar characteristic.
Block-based loop filtering technology utilizes the local similar characteristic of image, but does not fully consider non local self similarity
Property.Loop filter (Non-local Structure-Based Filter for based on the non local similar characteristic of image
Video Coding, NLSF) the non local structure similar characteristic of image is mainly utilized, the similar structure group obtained to search is assisted
With filtering.In current NLSF, using the higher singular value decomposition of complexity (Singular Value Decomposition,
SVD) mode, and threshold value is obtained by off-line training, it is universal poor, limit the performance of loop filtering.
Therefore, it is necessary to a kind of methods of improved loop filtering, to improve the performance of loop filtering.
Summary of the invention
The embodiment of the invention provides a kind of method, apparatus of loop filtering and computer systems, can be improved loop filter
The performance of wave.
In a first aspect, providing a kind of method of loop filtering, comprising: determine the first transformation side in a variety of mapping modes
Formula；Determine the corresponding first threshold of first mapping mode；According to first mapping mode and the first threshold, treat
The image block of filtering is filtered, and obtains reconstruction image block.
Second aspect provides the device of loop filtering, comprising: mapping mode determining module, in a variety of transformation sides
The first mapping mode is determined in formula；Threshold determination module, for determining the corresponding first threshold of first mapping mode；Processing
Module, for being filtered, being rebuild to image block to be filtered according to first mapping mode and the first threshold
Image block.
The third aspect provides a kind of computer system, comprising: memory, for storing computer executable instructions；Place
Device is managed, for accessing the memory, and the computer executable instructions are executed, in the method to carry out above-mentioned first aspect
Operation.
Fourth aspect provides a kind of computer storage medium, is stored with program code in the computer storage medium, should
Program code can serve to indicate that the method for executing above-mentioned first aspect.
The technical solution of the embodiment of the present invention, by determining used mapping mode, and needle in a variety of mapping modes
To used mapping mode threshold value, the universality and robustness of loop filtering can be improved, so as to improve loop
The performance of filtering.
Detailed description of the invention
Fig. 1 is the architecture diagram using the technical solution of the embodiment of the present invention.
Fig. 2 is the schematic diagram of the data to be encoded of the embodiment of the present invention.
Fig. 3 is the coding framework schematic diagram of the embodiment of the present invention.
Fig. 4 is the schematic flow chart of the method for the loop filtering of the embodiment of the present invention.
Fig. 5 is the schematic block diagram of the device of the loop filtering of the embodiment of the present invention.
Fig. 6 is the schematic block diagram of the computer system of the embodiment of the present invention.
Specific embodiment
Below in conjunction with attached drawing, technical solution in the embodiment of the present invention is described.
It should be understood that specific example herein is intended merely to that those skilled in the art is helped to more fully understand that the present invention is real
Example is applied, the range for the embodiment that is not intended to limit the present invention.
It should also be understood that the formula in the embodiment of the present invention is a kind of example, the range for the embodiment that is not intended to limit the present invention,
Each formula can be deformed, these deformations also should belong to the scope of protection of the invention.
It should also be understood that in various embodiments of the present invention, the size of the serial number of each process is not meant to execute sequence
It is successive, the execution of each process sequence should be determined by its function and internal logic, the implementation without coping with the embodiment of the present invention
Journey constitutes any restriction.
It should also be understood that various embodiments described in this specification, both can individually implement, implementation can also be combined,
The embodiment of the present invention does not limit this.
Unless otherwise indicated, all technical and scientific terms used in the embodiment of the present invention and technical field of the invention
The normally understood meaning of technical staff it is identical.Term used in this application is intended merely to the mesh of description specific embodiment
, it is not intended that limitation scope of the present application.Term "and/or" used in this application includes one or more relevant listed
Any and all combinations of item.
Fig. 1 is the architecture diagram using the technical solution of the embodiment of the present invention.
As shown in Figure 1, system 100 can receive pending data 102, pending data 102 is handled, at generation
Data 108 after reason.For example, system 100 can receive data to be encoded, after being encoded data to be encoded to generate coding
Data are treated decoding data and are decoded to generate decoded data alternatively, system 100 can receive data to be decoded.?
In some embodiments, the component in system 100 can be realized that the processor can be calculating equipment by one or more processors
In processor, the processor being also possible in mobile device (such as unmanned plane).The processor can be the place of any kind
Device is managed, it is not limited in the embodiment of the present invention.In some possible designs, which may include encoder, decoding
Device or codec etc..It can also include one or more memories in system 100.The memory can be used for store instruction sum number
According to, for example, realize the computer executable instructions of the technical solution of the embodiment of the present invention, data after pending data 102, processing
108 etc..The memory can be the memory of any kind, the embodiment of the present invention to this also without limitation.
Data to be encoded may include text, image, Drawing Object, animation sequence, audio, video, or any need
Other data of coding.In some cases, data to be encoded may include the sensing data from sensor, which can
Think visual sensor (for example, camera, infrared sensor), microphone, nearfield sensor is (for example, ultrasonic sensor, thunder
Up to), position sensor, temperature sensor, touch sensor etc..In some cases, data to be encoded may include to use by oneself
The information at family, for example, biological information, which may include facial characteristics, finger scan, retina scanning, voice note
Record, DNA sampling etc..
Fig. 2 shows the schematic diagrames of the data to be encoded of the embodiment of the present invention.
As shown in Fig. 2, data to be encoded 202 may include multiple frames 204.For example, multiple frames 204 can indicate video flowing
In continuous picture frame.Each frame 204 may include one or more bands or patch block (tile) 206.Each band or
Tile206 may include one or more macro blocks or coding unit 208.Each macro block or coding unit 208 may include one
Or multiple pieces 210.Each piece 210 may include one or more pixels 212.Each pixel 212 may include one or more
Data set corresponds to one or more data portions, for example, brightness data part and chroma data part.Data cell can be with
For frame, band, tile, coding unit, macro block, block, the group of pixel or any of the above.In various embodiments, data sheet
The size of member can change.As an example, a frame 204 may include 100 bands 206, and each band 206 may include 10
A macro block 208, each macro block 208 may include 4 (for example, 2x2) blocks 210, each piece 210 may include 64 (for example,
8x8) pixel 212.
Coding is required for efficient and/or safe transmission or storing data.It can be with to the coding of data to be encoded
Including data compression, encryption, Error Correction of Coding, format conversion etc..For example, can to multi-medium data (such as video or audio) compression
To reduce the amount of bits transmitted in a network.Sensitive data, such as Financial Information and identification information, in transimission and storage
Before can encrypt with protect secret and/or privacy.Occupied bandwidth is stored and transmitted in order to reduce video, is needed to video counts
According to progress encoding compression processing.
Any suitable coding techniques may be used to encode data to be encoded.Type of coding depends on data encoded
With specific code requirement.
In some embodiments, one or more different codecs may be implemented in encoder.Every kind of codec can
To include the code for realizing different coding algorithm, instruction or computer program.Based on various factors, the class including data to be encoded
Type and/or source, the receiving entity of coded data, available computing resource, network environment, business environment, Codes and Standards etc.,
It can choose a kind of data to be encoded that suitable encryption algorithm coding is given.
For example, encoder can be configured as a series of video frames of coding.The data encoded in each frame can be using one
Series of steps.In some embodiments, coding step may include the processing steps such as prediction, transformation, quantization, entropy coding.
Prediction include intra prediction and inter-prediction two types, its object is to using prediction block message removal currently to
The redundancy of coded picture block.Intra prediction utilizes the information acquisition prediction block data of this frame image.Inter-prediction utilizes ginseng
The information acquisition prediction block data of frame are examined, process includes that image block to be encoded is divided into several subimage blocks；Then, needle
To each subimage block, search is with the most matched image block of current subimage block as prediction block in a reference image；Thereafter, will
The respective pixel values of the subimage block and prediction block subtract each other to obtain residual error, and combine the corresponding residual error of obtained each subimage block
Together, the residual error of image block is obtained.
The correlation that can remove the residual error of image block is converted using residual block of the transformation matrix to image, that is, is removed
The redundancy of image block, to improve code efficiency, the transformation of the data block in image block generallys use two-dimensional transform, that is, exists
The residual information of data block is multiplied with the transformation matrix of NxM and its transposed matrix by coding side respectively, obtains after being multiplied
Be transformation coefficient.Transformation coefficient is quantified quantified after coefficient, finally by after quantization coefficient carry out entropy coding, most
Coding mode information by bit stream that entropy coding obtains and after being encoded afterwards, such as intra prediction mode, motion vector information
Deng being stored or be sent to decoding end.In the decoding end of image, entropy decoding is carried out after acquisition entropy coding bit stream first, is obtained
To corresponding residual error, the corresponding forecast image block of information images block such as the motion vector or intra prediction that are obtained according to decoding, root
It is predicted that the residual error of image block and image block obtains the value of each pixel in current subimage block.
Fig. 3 shows the coding framework schematic diagram of the embodiment of the present invention.
As shown in figure 3, the process of coding can be as follows when using inter-prediction:
In 301, current frame image is obtained.In 302, reference frame image is obtained.In 303a, reference frame figure is utilized
Picture carries out estimation, to obtain the motion vector (Motion Vector, MV) of each image block of current frame image.?
In 304a, the motion vector obtained using estimation carries out motion compensation, to obtain estimated value/prediction of current image block
Value.In 305, estimated value/predicted value and the current image block of current image block are subtracted each other, residual error is obtained.In 306, to residual
Difference is converted, to obtain transformation coefficient.In 307, transformation coefficient is quantified quantified after coefficient.It, will in 308
Coefficient after quantization carries out entropy coding, and finally the coding mode information by bit stream that entropy coding obtains and after being encoded carries out
Store or be sent to decoding end.In 309, inverse quantization is carried out to the result of quantization.In 310, inverse quantization result is carried out anti-
Transformation.In 311, using inverse transformation result and motion compensated result, obtain rebuilding pixel.In 312, to rebuild pixel into
Row filtering (i.e. loop filtering).In 313, filtered reconstruction pixel is exported.Subsequent, the image after reconstruction can be used as other
The reference frame image of frame image carries out inter-prediction.
When using intra prediction, the process of coding can be as follows:
In 302, current frame image is obtained.In 303b, intra prediction selection is carried out to current frame image.In 304b
In, the current image block in present frame carries out intra prediction.In 305, by the estimated value and current image block of current image block
Subtract each other, obtains residual error.In 306, the residual error of image block is converted, to obtain transformation coefficient.In 307, transformation coefficient
It is quantified quantified after coefficient.In 308, the coefficient after quantization is subjected to entropy coding, finally obtains entropy coding
Bit stream and the coding mode letter after being encoded are stored or are sent to decoding end.In 309, quantized result is carried out anti-
Quantization.In 310, inverse transformation is carried out to inverse quantization result, using inverse transformation result and intra-prediction result, to obtain in 311
To reconstruction pixel.Image block after reconstruction can be used for the intra prediction of next image block.
For decoding end, then operation corresponding with coding side is carried out.First with entropy decoding and inverse quantization and contravariant
It gets residual information in return, and determines that current image block uses intra prediction or inter-prediction according to decoded bit stream.If it is frame
Interior prediction, then using reconstruction image block according to intra-frame prediction method constructs predictive information in present frame；If it is inter-prediction,
It then needs to parse motion information, and determines reference block in the image rebuild using the motion information parsed, obtain
Predictive information；Next, being again overlapped predictive information and residual information, and can obtain rebuilding letter by filtering operation
Breath.
The technical solution of the embodiment of the present invention can be applied in coding or decoded filtering, for example, can apply
In NLSF.
Block-based loop filtering technology includes bilateral filtering, deblocking filtering, adaptive sample value compensation filter and adaptive
Loop filtering.The basic thought of bilateral filtering is that current pixel is counted by own and the weighted average of adjacent four pixel values
It calculates, realizes and protect side denoising.Deblocking filtering and adaptive sample value compensation filter have continued to use the method in HEVC.Deblocking filtering is for pre-
The boundary for surveying unit and converter unit carries out the nonlinear weight of boundary pixel using the low-pass filter that training obtains, thus
Reduce blocking artifact.Adaptive sample value compensation filter adds phase by classifying to pixel in image block, and then for every class pixel
Mode with offset makes reconstructed image closer to original image, to play the role of suppressed ringing effect.Adaptive ring
Road filtering is a kind of Wiener filter, is mainly used for minimizing the mean square error between original image and reconstructed image.Kind is based on
The filtering technique of block utilizes the local similar characteristic of image, does not fully consider non local self-similarity, this allows for filter
Performance be greatly limited.In order to solve this problem, the ring much based on the non local similar characteristic of image is proposed
Road filtering technique.
The loop filter based on the non local similar characteristic of image in Video coding (NLSF) is mainly non-using image at present
Partial structurtes similar characteristic, the similar structure group obtained to search carry out collaboration filtering.
The specific process flow of NLSF is as follows.
(1) similar Block- matching and structural array create (Group Construction) process.
Image is handled by block.Dividing the image into size isK block, each piece of pixel number is
Bs, each piece with vector xkIt indicatesUsing these blocks as current block, to each current block
Opening up a size is Ws*WsSquare aearch window.Image is successively extracted according to raster scan order in the search window
Block, the error sum of squares (Sum of Squared Differences, SSD) for calculating current block and mentioning between image block are used as phase
Like degree, calculation formula is as follows.
Wherein, f (h, w) indicates current block pixel,Indicate the pixel of extraction block.
The image block extracted is ranked up according to similarity, chooses the smallest c image block of SSD, is i.e. c most like
Block.
Then, by the c chosen most like piece of composition setAnd by the pixel value B of fritters all in sets*1
One-dimensional vector indicate, c one-dimensional vector is formed into two-dimensional structure array
WhereinBe a size be Bs* the matrix of c, eachIn image block as a column vector.
The process of filtering is exactly the treatment process to matrix (structural array), it is therefore an objective to filter out the mistake introduced in cataloged procedure
True and noise, this process are properly termed as the filtering (Group-based filtering) based on structural array.
(2) SVD decomposition is carried out to structural array.
The process that SVD is decomposed can be understood as the transformation of matrix, and two-dimensional matrix can be specifically decomposed into three matrixes
The form of product.
For example,
The purpose that SVD is decomposed is that structural array is extracted to principal component, and simple SVD can not play the role of filtering, filter
The key of wave is removal noise, and the place of noise is removed in NLSF using the operation of hard -threshold.
Hard -threshold operation is carried out to singular value, achievees the purpose that filtering.
Wherein, (x, a)=x ⊙ 1 (abs (x)-a) represent hard -threshold operation to hard, and ⊙ represents the dot product of two vectors, τ generation
Table threshold value can be obtained by off-line training.
The intermediate matrix of formula (4) is a diagonal matrix, and the element on diagonal line is sequentially reduced from the upper left corner to the lower right corner,
Lesser element can be considered noise, wherein the evaluation criterion of " smaller " can use a threshold value, if threshold value is
60, that one part less than 60 is considered noise, is directly disposed as 0.
For example, formula (4) becomes after hard -threshold operation:
After hard -threshold operation, obtained matrix and the original matrix decomposed can not be identical, and here it is filter out noise
Result later.
(3) image reconstruction
It is obtained according to the result of singular value decomposition and rebuilds structure group.Since each pixel in image may be by filtering
Reason repeatedly, finally can be used the mode that these filter results are averaged carrying out reconstruction image.
In current NLSF, using the higher SVD mode of complexity, and threshold value is obtained by off-line training, it is universal compared with
Difference limits the performance of loop filtering.
In consideration of it, the embodiment of the invention provides a kind of technical solution, in such a way that a variety of translating self-adaptings select, and
And the threshold parameter different for different shift designs, improve the performance of loop filtering.
The technical solution of the embodiment of the present invention both can be applied to coding side, also can be applied to decoding end.In the present invention
In the description of the technical solution of embodiment, unless specifically stated otherwise, described scheme is all suitable for coding side and decoding end.
Fig. 4 shows the schematic flow chart of the method 400 of the loop filtering of one embodiment of the invention.This method 400
Can system 100 as shown in Figure 1 execute.
410, the first mapping mode is determined in a variety of mapping modes.
In embodiments of the present invention, by the way of the selection of a variety of translating self-adaptings, i.e., no longer fixed to use a kind of transformation
Mode, but adaptively selected mapping mode.
A variety of mapping modes may include SVD, discrete cosine transform (Discrete Cosine Transform, DCT),
Hadamard transform, Karhunen-Loeve Transform (KLT) and signal rely on transformation (Signal Dependent
Transform, SDT) at least two mapping modes.For each image block to be filtered, selected in a variety of mapping modes
A kind of mapping mode is selected to be filtered.
In embodiments of the present invention, the rank that mapping mode selects is image block rank.For example, image block can be to compile
Code tree unit (Coding Tree Unit, CTU) indicates that mapping mode is selected as the operation of CTU rank or image block can also
To be full frame image, indicate that mapping mode is selected as the other operation of frame level.It should be understood that image block is also possible to other in image
Elementary area/data cell, the embodiment of the present invention do not limit this.
Optionally, in an embodiment of the invention, first transformation can be determined according to the characteristics of image of image block
Mode.
In the present embodiment, for the feature of image block itself, mapping mode is selected.Optionally, characteristics of image can wrap
Include at least one in variance, texture and architectural characteristic.In this way, the particular content of selected mapping mode and image block closes
Connection, can be improved the universality of filtering.
It specifically, can be according to the characteristics of image of described image block and a variety of mapping modes and characteristics of image
Corresponding relationship determines first mapping mode.
Using characteristics of image as variances sigma2For, following corresponding relationship can be used.
Type=0, if σ2> a
Type=1, if b < σ2≤a
Type=2, if c < σ2≤b
Type=3, if σ2≤c
Wherein, a, b, c, d are to count obtained empirical value, type1,2,3 ... different mapping modes is represented, such as can
To respectively represent SVD, DCT, Hadamard transform, KLT etc..
When selecting mapping mode, according to the variances sigma of image block2, select corresponding mapping mode.This mode can have
The complexity that effect ground reduces coding side can also be judged, without additional moreover, judgment mode is simple in decoding end
Transmitted bit carrys out the mapping mode that presentation code end is chosen.
Optionally, in another embodiment, a variety of mapping modes can be respectively adopted to described image
Block is filtered, and determines the corresponding selective goal of every kind of mapping mode；The mapping mode for selecting the selective goal optimal as
First mapping mode.
Specifically, in the present embodiment, when selecting mapping mode, every kind of mapping mode can all be attempted one time,
Then optimal mapping mode is selected.Optionally, for judging whether that optimal selective goal can be filtered image block
With the difference of original picture block.For example, the selective goal can for error sum of squares (Sum of Squared Error,
SSE), in this case, first mapping mode is the smallest mapping mode of SSE.
For example, SSE can be calculated using following formula.
Wherein H, W represent the height and width of coded picture block (such as CTU or full frame image), and f (h, w) represents original
Value,Represent the value after filtering is rebuild.
It should be understood that above-mentioned selective goal can also use other indexs, the embodiment of the present invention does not limit this.
Optionally, in another embodiment, coding side can indicate information, the transformation in a manner of transcoding, coding transform
Mode indicates that information is used to indicate first mapping mode.Optionally, the mapping mode instruction information can be with image block
It is encoded for unit.
That is, code stream can be written in selected mapping mode by coding side, it is sent to decoding end.Correspondingly, it solves
Code end can indicate information according to decoded mapping mode, determine first mapping mode.
If the selection of mapping mode is CTU grades of operation, the mode of mapping mode write-in code stream can be each CTU and pass
The corresponding number of a mapping mode is passed, wherein there can be union operation；It is also possible to every primary instruction information of frame transmitting, instruction
The mapping mode of all CTU of the frame.If the selection of mapping mode is the operation of frame level, by the way of frame level transmitting, that is, select
The mapping mode for taking most suitable full frame image is transferred to decoding end, can reduce the bit number of transmission in this way.
It should be understood that in embodiments of the present invention, coding side can send mapping mode to decoding end and indicate information, can also be with
Mapping mode is not sent to decoding end indicate information.In the case where coding side sends mapping mode instruction information, decoding end can
Directly to indicate information according to the mapping mode, mapping mode used by determining；Mapping mode instruction is not sent in coding side
In the case where information, decoding end can use selection mode same as coding side, mapping mode used by selecting.
420, determine the corresponding first threshold of first mapping mode.
In embodiments of the present invention, for selected mapping mode, the corresponding threshold value of the mapping mode is determined.Different
The influence factor of the threshold value of mapping mode may be different, therefore, can be true using different threshold values for different mapping modes
Determine mode.The method of determination of threshold value can be using offline estimation mode or On-line Estimation mode, both threshold value methods of determination
It can be selected according to mapping mode.
Optionally, in an embodiment of the invention, the first threshold can be determined according to preset threshold information.
In the present embodiment, it can select for the influence factor of the threshold value of mapping mode according to preset threshold information,
The mode of threshold value estimates mode offline.For example, if the influence factor and video of the threshold value of selected mapping mode
Particular content relationship is little, then can be using offline estimation mode.That is, by estimating mode threshold value information offline.For example, can
By the functional relation by threshold value and coding parameter in a manner of estimating offline, or by estimating mode threshold value offline and compiling
The relationship of tabling look-up of code parameter.
For estimating offline, be exactly by quantization parameter (Quantization Parameter, QP), frame type,
The coding parameters such as inter-reference relationship, image level (layer) carry out the training of threshold value, obtain the functional relation between them.
This mode is unrelated with video, content frame, and encoding and decoding end is fixed to use same functional relation.
For example, following threshold calculations functional relation can be used:
Wherein, what the numerical value O.13 represented with 0.71 obtained as off-line training, different bit-depths, different frame classes
Type and coloration and brightness all correspond to different parameters (numerical value of 0.13 and 0.71 corresponding position).
It should be understood that above-mentioned functional relation only illustrate, the parameter model estimated offline be not necessarily it is above-mentioned this, can also adopt
Mode is estimated with other.
Optionally, in another embodiment, described can be determined according to the characteristics of image of described image block
One threshold value.
In the present embodiment, the threshold value by the way of On-line Estimation.Specifically, based on the feature of image block itself,
Calculate threshold value.For example, can be used if the influence factor of the threshold value of selected mapping mode and characteristics of image relationship are larger
Mode based on characteristics of image threshold value.
Optionally, characteristics of image may include at least one in variance, texture and architectural characteristic.It is side with characteristics of image
Poor σ2For, following threshold calculations formula can be used.
Wherein,The standard deviation of compression noise is represented,Successively represent matrixKth ties up the original of the space SVD
Graphics standard is poor.Parameter c is the constant for being distributed and changing with original signal.Such as it for Gaussian Profile signal c=1, draws
This distribution of pula c=22.
Optionally, in another embodiment, coding side can encode the threshold value instruction information, the threshold value
Instruction information is used to indicate the first threshold.
That is, code stream can be written in identified threshold value by coding side, it is sent to decoding end.Correspondingly, decoding end
Information can be indicated according to decoded threshold value, determine the first threshold.
It should be understood that the threshold value instruction information can be in video parameter collection (Video Parameter Set), sequence head
(Sequence Header), sequence parameter set (Sequence Parameter Set), image head (Picture Header),
It is encoded in picture parameter set (Picture Parameter Set), slice header (Slice Header) coding.Decoding end from
Video parameter collection (Video Parameter Set), sequence head (Sequence Header), sequence parameter set (Sequence
Parameter Set), image head (Picture Header), picture parameter set (Picture Parameter Set), band
Head (Slice Header) decodes the first threshold.
Optionally, image is generally divided into different levels (layer), the image of different levels in video coding and decoding technology
With different reference prediction relationships or different importance or different resolution ratio or different coding qualities.The present invention
It can be encoded in video parameter collection, sequence head, sequence parameter set, reference picture collection (Reference Picture Set) different
The corresponding threshold value of image level indicates information.Decoding end is from video parameter collection, sequence head, sequence parameter set, reference picture
The corresponding threshold value of decoding different images level is concentrated to indicate information.
It should be understood that in embodiments of the present invention, coding side can indicate information to decoding end sending threshold value, can not also be to
Decoding end sending threshold value indicates information.In the case where coding side sending threshold value indicates information, decoding end can directly basis be somebody's turn to do
Threshold value indicates information, and the processing complexity of decoding end can be effectively reduced in threshold value used by determining in this way；It is not sent out in coding side
In the case where sending threshold value to indicate information, decoding end can use method of determination threshold value same as coding side.
430, according to first mapping mode and the first threshold, image block to be filtered is filtered, is obtained
Reconstruction image block.
Mapping mode used by being determined in a variety of mapping modes, and it is directed to used mapping mode threshold value
Afterwards, according to determining mapping mode and threshold value, image block is filtered, obtains reconstruction image block.
Specifically, after the structural array of creation image block, it can be according to first mapping mode and described first
Threshold value decomposes the structural array of the image block of creation, that is, it is decomposed using first mapping mode, it is therein
Hard -threshold operation uses the first threshold, then according to the structural array of decomposition, obtains and rebuilds structural array, and then obtains weight
Build image block.
For example, can be divided by the way of aforementioned SVD structural array if used mapping mode is SVD
Solution.
The technical solution of the embodiment of the present invention, by determining used mapping mode, and needle in a variety of mapping modes
To used mapping mode threshold value, the universality and robustness of loop filtering can be improved, so as to improve loop
The performance of filtering.
The method that the loop filtering of the embodiment of the present invention has been described in detail above, is described below the embodiment of the present invention
The device and computer system of loop filtering.
Fig. 5 shows the schematic block diagram of the device 500 of the loop filtering of one embodiment of the invention.The device 500 can
Method to execute the loop filtering of the embodiments of the present invention.
As shown in figure 5, the device 500 may include:
Mapping mode determining module 510 is obtained, for determining the first mapping mode in a variety of mapping modes；
Threshold determination module 520, for determining the corresponding first threshold of first mapping mode；
Processing module 530, for according to first mapping mode and the first threshold, to image block to be filtered into
Row filtering, obtains reconstruction image block.
Optionally, in another embodiment, the mapping mode determining module 510 is specifically used for:
According to the characteristics of image of described image block, first mapping mode is determined.
Optionally, in another embodiment, the mapping mode determining module 510 is specifically used for:
According to the characteristics of image of described image block and the corresponding relationship of a variety of mapping modes and characteristics of image, really
Fixed first mapping mode.
Optionally, in another embodiment, the processing module 530 is used for:
A variety of mapping modes are respectively adopted to be filtered described image block, determine the corresponding choosing of every kind of mapping mode
Select index；
The mapping mode determining module 510 is specifically used for: the mapping mode for selecting the selective goal optimal is as institute
State the first mapping mode.
Optionally, in another embodiment, the selective goal is SSE, and first mapping mode is SSE
The smallest mapping mode.
Optionally, in another embodiment, described device 500 is applied to coding side, the processing module 530
It is also used to:
Transcoding, coding transform mode indicates that information, the mapping mode instruction information are used to indicate first mapping mode.
Optionally, the mapping mode instruction information is encoded as unit of image block.
Optionally, in another embodiment, described device 500 is applied to decoding end, and the mapping mode is true
Cover half block 510 is specifically used for:
Information is indicated according to decoded mapping mode, determines first mapping mode.
Optionally, in another embodiment, the threshold determination module 520 is specifically used for:
According to preset threshold information, the first threshold is determined.
Optionally, in another embodiment, the threshold information is by estimating that mode determines offline.
Optionally, in another embodiment, the threshold information includes the function pass of threshold value and coding parameter
The relationship of tabling look-up of system or threshold value and coding parameter.
Optionally, in another embodiment, the threshold determination module 520 is specifically used for:
According to the characteristics of image of described image block, the first threshold is determined.
Optionally, in another embodiment, described image feature includes in variance, texture and architectural characteristic
At least one of.
Optionally, in another embodiment, described device 500 is applied to coding side, the processing module 530
It is also used to:
Coding threshold indicates that information, the threshold value instruction information are used to indicate the first threshold.
Optionally, the processing module 530 is used in video parameter collection, sequence head, sequence parameter set, image head, image
Threshold value described in parameter set, band header encoder indicates information.
Optionally, the processing module 530 is used to concentrate in video parameter collection, sequence head, sequence parameter set, reference picture
It encodes the corresponding threshold value of different images level and indicates information.
Optionally, in another embodiment, described device 500 is applied to decoding end, and the threshold value determines mould
Block 520 is specifically used for:
Information is indicated according to decoded threshold value, determines the first threshold.
Optionally, the processing module 530 is also used in video parameter collection, sequence head, sequence parameter set, image head, figure
Information is indicated as parameter set, slice header decode the threshold value.
Optionally, the processing module 530 is also used in video parameter collection, sequence head, sequence parameter set, reference picture collection
The corresponding threshold value of middle decoding different images level indicates information.
Optionally, in another embodiment, a variety of mapping modes include SVD, DCT, Hadamard transform,
At least two mapping modes in KLT and SDT.
Optionally, in another embodiment, described image block is CTU or full frame image.
It should be understood that the device of the loop filtering of the embodiments of the present invention can be chip, it specifically can be by circuit reality
It is existing, but the embodiment of the present invention to concrete implementation form without limitation.
The embodiment of the invention also provides a kind of encoders, and the encoder is for realizing coding side in the embodiment of the present invention
Function may include the module that coding side is used in the device of the loop filtering of the embodiments of the present invention.
The embodiment of the invention also provides a kind of decoders, and the decoder is for realizing decoding end in the embodiment of the present invention
Function may include the module that decoding end is used in the device of the loop filtering of the embodiments of the present invention.
The embodiment of the invention also provides a kind of codec, which includes the loop of the embodiments of the present invention
The device of filtering.
Fig. 6 shows the schematic block diagram of the computer system 600 of the embodiment of the present invention.
As shown in fig. 6, the computer system 600 may include processor 610 and memory 620.
It should be understood that the computer system 600 can also include component usually included in other computer systems, example
Such as, input-output equipment, communication interface etc., the embodiment of the present invention does not limit this.
Memory 620 is for storing computer executable instructions.
Memory 620 can be various memories, such as may include high-speed random access memory (Random
Access Memory, RAM), can also include non-labile memory (non-volatile memory), for example, at least one
A magnetic disk storage, the embodiment of the present invention do not limit this.
Processor 610 executes the computer executable instructions for accessing the memory 620, to carry out above-mentioned hair
Operation in the method for the loop filtering of bright embodiment.
Processor 610 may include microprocessor, field programmable gate array (Field-Programmable Gate
Array, FPGA), central processing unit (Central Processing unit, CPU), graphics processor (Graphics
Processing Unit, GPU) etc., the embodiment of the present invention does not limit this.
The device and computer system of the loop filtering of the embodiment of the present invention can correspond to the loop filter of the embodiment of the present invention
The executing subject of the method for wave, and above and other operation of the modules in the device and computer system of loop filtering
And/or function is respectively in order to realize the corresponding process of aforementioned each method, for sake of simplicity, details are not described herein.
The embodiment of the invention also provides a kind of electronic equipment, which may include the various implementations of aforementioned present invention
The device or computer system of the loop filtering of example.
The embodiment of the invention also provides a kind of computer storage medium, program generation is stored in the computer storage medium
Code, the program code can serve to indicate that the method for executing the loop filtering of the embodiments of the present invention.
It should be understood that in embodiments of the present invention, term "and/or" is only a kind of incidence relation for describing affiliated partner,
Indicate may exist three kinds of relationships.For example, A and/or B, can indicate: individualism A exists simultaneously A and B, individualism B this
Three kinds of situations.In addition, character "/" herein, typicallys represent the relationship that forward-backward correlation object is a kind of "or".
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware
With the interchangeability of software, each exemplary composition and step are generally described according to function in the above description.This
A little functions are implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Specially
Industry technical staff can use different methods to achieve the described function each specific application, but this realization is not
It is considered as beyond the scope of this invention.
It is apparent to those skilled in the art that for convenience of description and succinctly, foregoing description is
The specific work process of system, device and unit, can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.In addition, shown or beg for
Opinion mutual coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING of device or unit
Or communication connection, it is also possible to electricity, mechanical or other form connections.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.Some or all of unit therein can be selected to realize the embodiment of the present invention according to the actual needs
Purpose.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, is also possible to two or more units and is integrated in one unit.It is above-mentioned integrated
Unit both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the present invention
Portion or part steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can store journey
The medium of sequence code.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection scope subject to.
Claims (43)
1. a kind of method of loop filtering characterized by comprising
The first mapping mode is determined in a variety of mapping modes；
Determine the corresponding first threshold of first mapping mode；
According to first mapping mode and the first threshold, image block to be filtered is filtered, reconstruction image is obtained
Block.
2. the method according to claim 1, wherein described determine the first transformation side in a variety of mapping modes
Formula, comprising:
According to the characteristics of image of described image block, first mapping mode is determined.
3. according to the method described in claim 2, it is characterized in that, the characteristics of image according to described image block, determines institute
State the first mapping mode, comprising:
According to the characteristics of image of described image block and the corresponding relationship of a variety of mapping modes and characteristics of image, institute is determined
State the first mapping mode.
4. the method according to claim 1, wherein described determine the first transformation side in a variety of mapping modes
Formula, comprising:
A variety of mapping modes are respectively adopted to be filtered described image block, determine that the corresponding selection of every kind of mapping mode refers to
Mark；
The mapping mode for selecting the selective goal optimal is as first mapping mode.
5. according to the method described in claim 4, it is characterized in that, the selective goal be error sum of squares SSE, described first
Mapping mode is the smallest mapping mode of SSE.
6. the method according to any one of claims 1 to 5, which is characterized in that the method also includes:
Transcoding, coding transform mode indicates that information, the mapping mode instruction information are used to indicate first mapping mode.
7. according to the method described in claim 6, it is characterized in that, the mapping mode indicate information as unit of image block into
Row coding.
8. the method according to claim 1, wherein described determine the first transformation side in a variety of mapping modes
Formula, comprising:
Information is indicated according to decoded mapping mode, determines first mapping mode.
9. method according to any one of claim 1 to 8, which is characterized in that determination first mapping mode
Corresponding first threshold, comprising:
According to preset threshold information, the first threshold is determined.
10. according to the method described in claim 9, it is characterized in that, the threshold information is by estimating that mode determines offline.
11. method according to claim 9 or 10, which is characterized in that the threshold information includes threshold value and coding parameter
Functional relation or threshold value and coding parameter relationship of tabling look-up.
12. method according to any one of claim 1 to 8, which is characterized in that determination first mapping mode
Corresponding first threshold, comprising:
According to the characteristics of image of described image block, the first threshold is determined.
13. according to method described in claim 2,3 or 12, which is characterized in that described image feature includes variance, texture and knot
At least one of in structure characteristic.
14. method according to any one of claim 1 to 13, which is characterized in that the method also includes:
The threshold value instruction information is encoded, the threshold value instruction information is used to indicate the first threshold.
15. according to the method for claim 14, which is characterized in that in video parameter collection, sequence head, sequence parameter set, figure
The threshold value as described in head, picture parameter set, band header encoder indicates information.
16. according to the method for claim 14, which is characterized in that in video parameter collection, sequence head, sequence parameter set, ginseng
It examines and encodes the corresponding threshold value instruction information of different images level in image set.
17. method according to any one of claim 1 to 8, which is characterized in that determination first mapping mode
Corresponding first threshold, comprising:
Information is indicated according to decoded threshold value, determines the first threshold.
18. according to the method for claim 17, which is characterized in that in video parameter collection, sequence head, sequence parameter set, figure
Information is indicated as head, picture parameter set, slice header decode the threshold value.
19. according to the method for claim 17, which is characterized in that in video parameter collection, sequence head, sequence parameter set, ginseng
It examines and decodes the corresponding threshold value instruction information of different images level in image set.
20. according to claim 1 to method described in any one of 19, which is characterized in that a variety of mapping modes include surprise
Different value decomposes SVD, discrete cosine transform, Hadamard transform, Karhunen-Loeve transformation KLT and signal and relies on transformation
At least two mapping modes in SDT.
21. according to claim 1 to method described in any one of 20, which is characterized in that described image block is coding tree unit
CTU or full frame image.
22. a kind of device of loop filtering characterized by comprising
Mapping mode determining module, for determining the first mapping mode in a variety of mapping modes；
Threshold determination module, for determining the corresponding first threshold of first mapping mode；
Processing module, for being filtered to image block to be filtered according to first mapping mode and the first threshold,
Obtain reconstruction image block.
23. device according to claim 22, which is characterized in that the mapping mode determining module is specifically used for:
According to the characteristics of image of described image block, first mapping mode is determined.
24. device according to claim 23, which is characterized in that the mapping mode determining module is specifically used for:
According to the characteristics of image of described image block and the corresponding relationship of a variety of mapping modes and characteristics of image, institute is determined
State the first mapping mode.
25. device according to claim 22, which is characterized in that the processing module is used for:
A variety of mapping modes are respectively adopted to be filtered described image block, determine that the corresponding selection of every kind of mapping mode refers to
Mark；
The mapping mode determining module is specifically used for: the mapping mode for selecting the selective goal optimal becomes as described first
Change mode.
26. device according to claim 25, which is characterized in that the selective goal is error sum of squares SSE, described the
One mapping mode is the smallest mapping mode of SSE.
27. the device according to any one of claim 22 to 26, which is characterized in that the processing module is also used to:
Transcoding, coding transform mode indicates that information, the mapping mode instruction information are used to indicate first mapping mode.
28. device according to claim 27, which is characterized in that the mapping mode instruction information is as unit of image block
It is encoded.
29. device according to claim 22, which is characterized in that the mapping mode determining module is specifically used for:
Information is indicated according to decoded mapping mode, determines first mapping mode.
30. the device according to any one of claim 22 to 29, which is characterized in that the threshold determination module is specifically used
In:
According to preset threshold information, the first threshold is determined.
31. device according to claim 30, which is characterized in that the threshold information is by estimating that mode determines offline
's.
32. the device according to claim 30 or 31, which is characterized in that the threshold information includes threshold value and coding parameter
Functional relation or threshold value and coding parameter relationship of tabling look-up.
33. the device according to any one of claim 22 to 29, which is characterized in that the threshold determination module is specifically used
In:
According to the characteristics of image of described image block, the first threshold is determined.
34. according to device described in claim 23,24 or 33, which is characterized in that described image feature include variance, texture and
At least one of in architectural characteristic.
35. the device according to any one of claim 22 to 34, which is characterized in that the processing module is also used to:
Coding threshold indicates that information, the threshold value instruction information are used to indicate the first threshold.
36. device according to claim 35, which is characterized in that the processing module is used in video parameter collection, sequence
Head, sequence parameter set, image head, picture parameter set, threshold value described in band header encoder indicate information.
37. device according to claim 35, which is characterized in that the processing module is used in video parameter collection, sequence
Head, sequence parameter set, reference picture concentrate the corresponding threshold value of coding different images level to indicate information.
38. the device according to any one of claim 22 to 29, which is characterized in that the threshold determination module is specifically used
In:
Information is indicated according to decoded threshold value, determines the first threshold.
39. the device according to claim 38, which is characterized in that the processing module is also used in video parameter collection, sequence
Column head, sequence parameter set, image head, picture parameter set, slice header decode the threshold value and indicate information.
40. the device according to claim 38, which is characterized in that the processing module is also used in video parameter collection, sequence
Column head, sequence parameter set, reference picture concentrate the corresponding threshold value of decoding different images level to indicate information.
41. the device according to any one of claim 22 to 40, which is characterized in that a variety of mapping modes include surprise
Different value decomposes SVD, discrete cosine transform, Hadamard transform, Karhunen-Loeve transformation KLT and signal and relies on transformation SDT
In at least two mapping modes.
42. the device according to any one of claim 22 to 41, which is characterized in that described image block is coding tree unit
CTU or full frame image.
43. a kind of computer system characterized by comprising
Memory, for storing computer executable instructions；
Processor for accessing the memory, and executes the computer executable instructions, to carry out according to claim 1
Operation into method described in any one of 21.
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| PCT/CN2018/081650 WO2019191888A1 (en) | 2018-04-02 | 2018-04-02 | Loop filtering method and apparatus, and computer system |
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