CN106534871A - Coding method and decoding method for video codec - Google Patents
Coding method and decoding method for video codec Download PDFInfo
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- CN106534871A CN106534871A CN201611108487.0A CN201611108487A CN106534871A CN 106534871 A CN106534871 A CN 106534871A CN 201611108487 A CN201611108487 A CN 201611108487A CN 106534871 A CN106534871 A CN 106534871A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
- H04N19/51—Motion estimation or motion compensation
- H04N19/573—Motion compensation with multiple frame prediction using two or more reference frames in a given prediction direction
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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
- H04N19/13—Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
- H04N19/51—Motion estimation or motion compensation
- H04N19/57—Motion estimation characterised by a search window with variable size or shape
Abstract
The invention provides a coding method and a decoding method for a video codec. The coding method comprises steps that a present to-be-coded image and a construction reference frame corresponding to a previous coded image of the present to-be-coded image are acquired; the construction reference frame corresponding to the previous coded image is updated according to the coded image, the construction reference frame corresponding to the previous coded image after update is taken as a construction reference frame corresponding to the present to-be-coded image; the construction reference frame corresponding to the present to-be-coded image is taken as a reference image, and the present to-be-coded image is coded. The coding method is advantaged in that coding and decoding performance can be improved.
Description
Technical field
The present invention relates to belong to the video coding and decoding technology field in digital media processing technology, more particularly to video compiles solution
The coding method of code device and coding/decoding method.
Background technology
Existing method for video coding is usually used the image of encoded mistake as reference frame.Exist in view of in cataloged procedure
Quantify loss, pixel value included in reference frame not necessarily most reference value；Meanwhile, the selection of reference frame is not
Have and make full use of above encoded great amount of images information.Therefore, prediction to current image some regions to be encoded is simultaneously forbidden
Really, cause coding efficiency low.
The content of the invention
The embodiment provides a kind of coding method of Video Codec and coding/decoding method, it is possible to increase compile solution
Code performance.
A kind of coding method of Video Codec, including：
Before the encoded image of the former frame of the current image to be encoded of acquisition and the current image to be encoded is corresponding
The corresponding structure reference frame of one frame encoded image；The reference frame that builds is the front cross frame according to the current image to be encoded
Encoded image and the corresponding prognostic chart picture of the front cross frame encoded image are produced；
The corresponding structure reference frame of the former frame encoded image is updated according to the encoded image, after renewal
The corresponding reference frame that builds of the former frame encoded image is used as the corresponding currently figure to be encoded of the current image to be encoded
As corresponding structure reference frame；
Using the currently image to be encoded corresponding current image to be encoded corresponding reference frame that builds as reference picture,
The current image to be encoded is encoded.
It is described that the corresponding structure reference frame of the former frame encoded image is updated according to the encoded image, will update
The rear former frame encoded image is corresponding to be built reference frame current image to be encoded is corresponding currently waits to compile as described
Code image it is corresponding build reference frame the step of include：
The relation between prognostic chart picture according to corresponding to the current encoded image and the current encoded image,
Calculate the coded residual of each location of pixels of the current encoded image；
According to the coded residual of each location of pixels of the current encoded image, to the former frame encoded image
The pixel value of corresponding each location of pixels for building reference frame is processed, and the generation current image to be encoded is corresponding to work as
The corresponding structure reference frame of front image to be encoded.
The coded residual of each location of pixels according to the current encoded image, it is encoded to the former frame
The pixel value of corresponding each location of pixels for building reference frame of image is processed, and generates the current image correspondence to be encoded
Image current to be encoded it is corresponding build reference frame the step of include：
Whether step a, judge the coded residual of current pixel position of the current encoded image less than threshold value；Work as institute
State judged result be less than when, then jump to step b, otherwise, jump to step c；
Step b, updates the pixel value of the corresponding current pixel position for building reference frame of the former frame encoded image；
Step c, does not update the pixel of the corresponding current pixel position for building reference frame of the former frame encoded image
Value；
According to step a- step c, each location of pixels for building reference frame corresponding to the former frame encoded image
Pixel value processed, generate the corresponding structure reference frame of current image to be encoded.
Before step a, methods described also includes：
Judge whether the place predicting unit of the current pixel position of the current encoded image is compiled using skip mode
Code；
When the judged result is to be, then step c is jumped to；Otherwise, jump to step a.
It is described update the former frame encoded image it is corresponding build reference frame current pixel position the step of include：
By the pixel value of the current pixel position of the current encoded image and the former frame encoded image
Being weighted with the pixel value of the current pixel position corresponding position in corresponding structure reference frame, is generated and calculates knot
Really；
Using the result of calculation, the corresponding described current picture for building reference frame of the former frame encoded image is updated
The pixel value of plain position corresponding position.
When the current image to be encoded is the first frame, the image of the former frame of the current image to be encoded is corresponding
The corresponding value for building reference frame of former frame encoded image is set to 0.
The pixel value of the current pixel position by the current encoded image is encoded with the former frame
The corresponding pixel value with the current pixel position corresponding position that is building in reference frame of image is weighted, and generates and calculates
As a result the step of, includes：
P ｀R(i, j)=PR(i,j)*w1+Prec(i,j)*w2
Wherein, (i, j) is current pixel position, Prec(i, j) is the pixel of the current pixel position of current encoded image
Value, PRThe pixel value of (i, j) for the corresponding current pixel position for building reference frame of former frame encoded image；P ｀R(i, j) is
Result of calculation；w1With w2Respectively the first weight and the second weight, w1+ w2=1.
A kind of coding/decoding method of Video Codec, including：
Before the image of decoding of the former frame of the current image to be decoded of acquisition and the current image to be decoded is corresponding
One frame has decoded the corresponding structure reference frame of image；The reference frame that builds is the front cross frame according to the current image to be decoded
The corresponding prognostic chart picture of the image of decoding for decoding image and the front cross frame produce；
According to it is described decoded image update described in former frame decoded the corresponding structure reference frame of image, after renewal
The former frame has decoded the corresponding reference frame that builds of image as the corresponding structure reference frame of the current image to be decoded；
Using the current image to be decoded corresponding reference frame that builds as reference picture, to the current image to be decoded
Decoded.
Former frame described in image update is decoded described in the basis and has decoded the corresponding structure reference frame of image, will have been updated
The former frame afterwards has decoded the corresponding reference frame that builds of image and has built reference as the current image to be decoded is corresponding
The step of frame, includes：
According to it is described currently decoded image and it is described currently decoded image corresponding to prognostic chart picture between relation,
Calculate the decoded residual of each location of pixels for currently having decoded image；
According to the decoded residual of each location of pixels for currently having decoded image, image is decoded to the former frame
The pixel value of corresponding each location of pixels for building reference frame is processed, and generates the corresponding structure of the image currently to be decoded
Build reference frame.
The decoded residual according to each location of pixels for currently having decoded image, is decoded to the former frame
The pixel value of corresponding each location of pixels for building reference frame of image is processed, and generates the current image correspondence to be decoded
Structure reference frame the step of include：
Whether step a, judge the decoded residual of the current pixel position for currently having decoded image less than threshold value；Work as institute
State judged result be less than when, then jump to step b, otherwise, jump to step c；
Step b, updates the pixel value that the former frame has decoded the corresponding current pixel position for building reference frame of image；
Step c, does not update the pixel that the former frame has decoded the corresponding current pixel position for building reference frame of image
Value；
According to step a- step c, corresponding each location of pixels for building reference frame of image is decoded to the former frame
Pixel value processed, generate the corresponding structure reference frame of current image to be decoded.
Before step a, methods described also includes：
Judge the place predicting unit of the current pixel position for currently having decoded image whether using skip mode solution
Code；
When the judged result is to be, then step c is jumped to；Otherwise, jump to step a.
Described renewal the step of the former frame has decoded the current pixel position of the corresponding structure reference frame of image includes：
The pixel value of the current pixel position for currently having decoded image image has been decoded into the former frame
Being weighted with the pixel value of the current pixel position corresponding position in corresponding structure reference frame, is generated and calculates knot
Really；
Using the result of calculation, update the former frame and decoded the corresponding described current picture for building reference frame of image
The pixel value of plain position corresponding position.
When the current image to be decoded is the first frame, the image of the former frame of the current image to be decoded is corresponding
Former frame has decoded the corresponding value for building reference frame of image and has been set to 0.
The pixel value by the current pixel position for currently having decoded image is decoded with the former frame
The corresponding pixel value with the current pixel position corresponding position that is building in reference frame of image is weighted, and generates and calculates
As a result the step of, includes：
P ｀R(i, j)=PR(i,j)*w1+Prec(i,j)*w2
Wherein, (i, j) is current pixel position, Prec(i, j) is the pixel of the current pixel position for currently having decoded image
Value, PR(i, j) has decoded the pixel value of the corresponding current pixel position for building reference frame of image for former frame；P ｀R(i, j) is
Result of calculation；w1With w2Respectively the first weight and the second weight, w1+ w2=1.
The technical scheme provided by embodiments of the invention described above is can be seen that in the embodiment of the present invention, builds reference frame
Selection utilization above encoding and decoding image information, it is possible to increase encoding and decoding performances.
The additional aspect of the present invention and advantage will be set forth in part in the description, and these will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Description of the drawings
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be to using needed for embodiment description
Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill of field, without having to pay creative labor, can be obtaining other according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of schematic diagram of the coding method of Video Codec that the embodiment of the present invention one is provided；
Fig. 2 is a kind of schematic diagram of the coding/decoding method of Video Codec that the embodiment of the present invention one is provided；
Fig. 3 be the embodiment of the present invention described in Video Codec coding method in build reference frame generation with it is adaptive
Answer the schematic diagram of update method；
Fig. 4 be the embodiment of the present invention described in Video Codec coding/decoding method in build reference frame generation with it is adaptive
Answer the schematic diagram of update method.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the drawings, wherein ad initio
Same or similar element or the element with same or like function are represented to same or similar label eventually.Below by ginseng
The embodiment for examining Description of Drawings is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
For ease of the understanding to the embodiment of the present invention, do by taking several specific embodiments as an example further below in conjunction with accompanying drawing
Explanation, and each embodiment does not constitute the restriction to the embodiment of the present invention.
As shown in figure 1, for a kind of coding method of Video Codec of the present invention, including：
Step 11, obtains the encoded image pair of the former frame of current image to be encoded and the current image to be encoded
The corresponding structure reference frame of former frame encoded image answered；The structure reference frame is according to the current image to be encoded
The corresponding prognostic chart picture of encoded image of the encoded image of front cross frame and the front cross frame is produced；When described current to be encoded
When image is the first frame, the corresponding structure of the corresponding former frame encoded image of image of the former frame of the current image to be encoded
The value for building reference frame is set to 0.
Step 12, updates the corresponding structure reference frame of the former frame encoded image according to the encoded image, will
The corresponding structure reference frame of the former frame encoded image after renewal is corresponding current as the current image to be encoded
The corresponding structure reference frame of image to be encoded；
Step 13, using the currently image to be encoded corresponding current image to be encoded corresponding reference frame that builds as ginseng
Image is examined, the current image to be encoded is encoded.
In the present invention, the present invention does not directly use a certain encoded image as reference frame, and adopts following calculations
Method builds a brand-new reference frame, improves encoding characteristics.
Step 12 includes：
Step 121, the prognostic chart picture according to corresponding to the current encoded image is with the current encoded image it
Between relation, calculate the coded residual of each location of pixels of the current encoded image；Coded residual is encoded image
Difference between corresponding prognostic chart picture.
Step 122, according to the coded residual of each location of pixels of the current encoded image, to the former frame
The pixel value of corresponding each location of pixels for building reference frame of coded image is processed, and generates the current image to be encoded
The corresponding structure reference frame of corresponding current image to be encoded.
In one embodiment, step 122 includes:
Whether step a, judge the coded residual of current pixel position of the current encoded image less than threshold value；Work as institute
State judged result be less than when, then jump to step b, otherwise, jump to step c；
Step b, updates the pixel value of the corresponding current pixel position for building reference frame of the former frame encoded image；
Step c, does not update the pixel of the corresponding current pixel position for building reference frame of the former frame encoded image
Value；
According to step a- step c, each location of pixels for building reference frame corresponding to the former frame encoded image
Pixel value processed, generate the corresponding structure reference frame of current image to be encoded.
Step b includes：
Step b1, the pixel value of the current pixel position of the current encoded image and the former frame are compiled
The corresponding pixel value with the current pixel position corresponding position that is building in reference frame of code image is weighted, and generates meter
Calculate result；The pixel value of the current pixel position by the current encoded image and the encoded figure of the former frame
As the corresponding pixel value with the current pixel position corresponding position that is building in reference frame is weighted, generates and calculate knot
The step of fruit, includes：
P ｀R(i, j)=PR(i,j)*w1+Prec(i,j)*w2
Wherein, (i, j) is current pixel position, Prec(i, j) is the pixel of the current pixel position of current encoded image
Value, PRThe pixel value of (i, j) for the corresponding current pixel position for building reference frame of former frame encoded image；P ｀R(i, j) is
Result of calculation；w1With w2Respectively the first weight and the second weight, w1+ w2=1.
Step b2, using the result of calculation, updates the corresponding institute for building reference frame of the former frame encoded image
State the pixel value of current pixel position corresponding position.
In another embodiment, step 122 includes:
Step a, judges whether the place predicting unit of the current pixel position of the current encoded image adopts and skips
Pattern-coding；
Whether step b, judge the coded residual of current pixel position of the current encoded image less than threshold value；Work as institute
State judged result be less than when, then jump to step c, otherwise, jump to step d；
Step c, updates the pixel value of the corresponding current pixel position for building reference frame of the former frame encoded image；
Step d, does not update the pixel of the corresponding current pixel position for building reference frame of the former frame encoded image
Value；
According to step a- step d, each location of pixels for building reference frame corresponding to the former frame encoded image
Pixel value processed, generate the corresponding structure reference frame of current image to be encoded.
As shown in Fig. 2 for a kind of coding/decoding method of Video Codec of the present invention, including：
Step 21, obtains the decoding image pair of the former frame of current image to be decoded and the current image to be decoded
The former frame answered has decoded the corresponding structure reference frame of image；The structure reference frame is according to the current image to be decoded
The corresponding prognostic chart picture of the image of decoding of image and the front cross frame that decodes of front cross frame is produced；When described current to be decoded
When image is the first frame, the corresponding former frame of image of the former frame of the current image to be decoded has decoded the corresponding structure of image
The value for building reference frame is set to 0.
Step 22, according to it is described decoded image update described in former frame decoded the corresponding structure reference frame of image, will
The former frame after renewal has decoded the corresponding reference frame that builds of image as the corresponding structure of the current image to be decoded
Reference frame；
Step 23, using the current image to be decoded corresponding reference frame that builds as reference picture, currently treats to described
Decoding image is decoded.
Step 22 includes：
Step 221, according to it is described currently decoded image with it is described currently decoded image corresponding to prognostic chart picture it
Between relation, calculate the decoded residual of each location of pixels for currently having decoded image；
Step 222, according to the decoded residual of each location of pixels for currently having decoded image, to the former frame
The pixel value of corresponding each location of pixels for building reference frame of decoding image is processed, and generates the current image to be decoded
Corresponding structure reference frame.
In one embodiment, step 222 includes：
Whether step a, judge the decoded residual of the current pixel position for currently having decoded image less than threshold value；Work as institute
State judged result be less than when, then jump to step b, otherwise, jump to step c；
Step b, updates the pixel value that the former frame has decoded the corresponding current pixel position for building reference frame of image；
Step c, does not update the pixel that the former frame has decoded the corresponding current pixel position for building reference frame of image
Value；
According to step a- step c, corresponding each location of pixels for building reference frame of image is decoded to the former frame
Pixel value processed, generate the corresponding structure reference frame of current image to be decoded.
In another embodiment, step 222 includes：
Step a, judges whether the place predicting unit of the current pixel position for currently having decoded image adopts and skips
Mode decoding；When the judged result is to be, then step c is jumped to；Otherwise, jump to step a.
Whether step b, judge the decoded residual of the current pixel position for currently having decoded image less than threshold value；Work as institute
State judged result be less than when, then jump to step c, otherwise, jump to step d；
Step c, updates the pixel value that the former frame has decoded the corresponding current pixel position for building reference frame of image；
Step d, does not update the pixel that the former frame has decoded the corresponding current pixel position for building reference frame of image
Value；
According to step a- step d, corresponding each location of pixels for building reference frame of image is decoded to the former frame
Pixel value processed, generate the corresponding structure reference frame of current image to be decoded.
Step c includes：
Step c1, the pixel value of the current pixel position for currently having decoded image is solved with the former frame
The corresponding pixel value with the current pixel position corresponding position that is building in reference frame of code image is weighted, and generates meter
Calculate result；The pixel value by the current pixel position for currently having decoded image and former frame decoding figure
As the corresponding pixel value with the current pixel position corresponding position that is building in reference frame is weighted, generates and calculate knot
The step of fruit, includes：P ｀R(i, j)=PR(i,j)*w1+Prec(i,j)*w2；
Wherein, (i, j) is current pixel position, Prec(i,j)The pixel of the current pixel position currently to have decoded image
Value, PR(i, j) has decoded the pixel value of the corresponding current pixel position for building reference frame of image for former frame；P ｀R(i, j) is
Result of calculation；w1With w2Respectively the first weight and the second weight, w1+ w2=1.
Step c2, using the result of calculation, updates the former frame and has decoded the corresponding institute for building reference frame of image
State the pixel value of current pixel position corresponding position.
The application scenarios of the present invention are below described.
The present invention builds the generation of reference frame and adaptive updates method in providing a kind of Video Codec.
In an encoding process, first, generated using encoded image information and build reference frame；Then, to building reference
Each pixel of frame carries out dynamic self-adapting renewal；Then, the image to be encoded of follow-up input can alternatively be used the structure
Reference frame is predicted coding as reference picture.
Accordingly, in decoding process, first, generated using the decoded image information of preamble and build reference frame；Then,
Each pixel to building reference frame carries out dynamic self-adapting renewal；Then, when structure of choosing of follow-up image to be decoded is joined
When examining frame, decoded as reference picture using the structure reference frame.
The following specifically describes：
The present invention builds the generation of reference frame and adaptive updates method in proposing a kind of Video Codec.The method bag
Include：
When cataloged procedure starts, generated using encoded image information and build reference frame；
The each pixel value for building reference frame is 0；
In an encoding process, according to the relation between the corresponding prognostic chart picture of encoded image, analyze each pixel
The coded residual of position；
According to coded residual, judge whether the current pixel position for building reference frame needs to update；
The reference frame that builds through updating is predicted coding as the reference picture of the image to be encoded of follow-up input.
That is, the original pixel values for building reference frame are all 0；With the carrying out of cataloged procedure, pixel value therein
Can constantly update；Updating principle is：Carry out judging whether to need to update according to coded residual；If updating, new picture is calculated
Plain value simultaneously replaces the original pixel value in the position in structure reference frame.
Above-mentioned steps are specially：When cataloged procedure starts, each pixel value for building reference frame R is initialized as into 0.When the 0th
After the completion of frame coding, the reconstruction image of the 0th frame and the relation of prognostic chart picture are analyzed, residual error between the two is obtained.To each pixel
The residual error of position is analyzed；When residual absolute value is less than threshold θ, it is believed that the location of pixels for building reference frame needs more
Newly, otherwise need not.For the location of pixels for needing to update in structure reference frame, new calculated for pixel values is as follows：
PR(i, j)=PR(i,j)*w1+Prec(i,j)*w2
Wherein, the position of (i, j) for current pixel, PrecFor encoded image (reconstruction image), w1With w2For weight.
Corresponding, in decoding process, methods described includes：
When decoding process starts, it is 0 to build each pixel value of reference frame；
When decoding process starts, according to the relation between the corresponding prognostic chart picture of current decoded image, analysis
The coded residual of each location of pixels；
According to coded residual, judge to build whether reference frame current pixel position needs to update；
The reference frame that builds through updating is decoded as the reference picture of follow-up image to be decoded.
In a kind of Video Codec proposed by the present invention in the generation of reference frame and adaptive updates method, update and build
The step of reference frame, is specially：
In an encoding process, for the location of pixels for needing to update in structure reference frame, using correspondence in encoded image
The pixel value of position is weighted with the pixel value for building the position in reference frame, and result of calculation is used as in structure reference frame
The new pixel value in the position.
Accordingly, generation and the adaptive updates side of reference frame are built in a kind of Video Codec proposed by the present invention
Method, updates the step of building reference frame and is specially：
In decoding process, for the location of pixels that needs to update in reference frame is built, using currently having decoded in image
The pixel value of correspondence position is weighted with the pixel value for building the position in reference frame, and result of calculation is referred to as building
The new pixel value in the position in frame.
Build in a kind of Video Codec proposed by the present invention in generation and the adaptive updates method of reference frame, compiling
During code, when the location of pixels place predicting unit of encoded image is encoded using skip mode, build in reference frame
The location of pixels is not updated.
Accordingly, generation and the adaptive updates method of reference frame are built in a kind of Video Codec proposed by the present invention
In, in an encoding process, when the location of pixels place predicting unit for currently having decoded image is encoded using skip mode, build
The location of pixels in reference frame is not updated.
As shown in figure 3, currently will encode to the 3rd frame, generated using the 0th, 1,2 frame and build reference frame R, and by the 3rd
Frame is used for inter-reference.As shown in figure 4, with the carrying out of cataloged procedure, it is to constantly update to build reference frame, it makes use of it
The information of front encoded excessively all images.
The example realizes platform for HM16.1, and as shown in table 1, test result is as shown in table 2 basic configuration.
Table 1：
2 this method of table and HM16.1 coding efficiency Comparative results
| Sequence sequences | Y-component | U components | V component |
| Video sequence 1 (576p) | - 0.9% | - 3.5% | - 5.2% |
| Video sequence 2 (720p) | - 1.6% | - 2.0% | - 2.0% |
| Video sequence 3 (480p) | - 1.3% | - 2.3% | - 2.9% |
| Video sequence 4 (1080p) | - 1.0% | - 0.8% | - 0.7% |
| Average mean values | - 1.20% | - 2.15% | - 2.70% |
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
Should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (10)
1. a kind of coding method of Video Codec, it is characterised in that include：
The corresponding structure of former frame encoded image for obtaining current image to be encoded and the current image to be encoded refers to
Frame；The reference frame that builds is encoded according to the front cross frame encoded image and the front cross frame of the current image to be encoded
The corresponding prognostic chart picture of image is produced；
The corresponding structure reference frame of the former frame encoded image is updated according to the encoded image, described in after renewal
Reference frame is built as the corresponding structure reference frame of the current image to be encoded；
Using the current image to be encoded corresponding reference frame that builds as reference picture, the current image to be encoded is carried out
Coding.
2. method according to claim 1, it is characterised in that described that the former frame is updated according to the encoded image
The corresponding structure reference frame of encoded image, using renewal after the structure reference frame as the current image correspondence to be encoded
Structure reference frame the step of include：
The relation between prognostic chart picture according to corresponding to the current encoded image and the current encoded image, calculates
The coded residual of each location of pixels of the current encoded image；
According to the coded residual of each location of pixels of the current encoded image, to former frame encoded image correspondence
The pixel value of each location of pixels of structure reference frame processed, generate that the current image to be encoded is corresponding to build ginseng
Examine frame.
3. method according to claim 2, it is characterised in that described each pixel according to the current encoded image
The coded residual of position, the pixel value of each location of pixels for building reference frame corresponding to the former frame encoded image are entered
Row is processed, and generating the step of current image to be encoded is corresponding to build reference frame includes：
Whether step a, judge the coded residual of current pixel position of the current encoded image less than threshold value；Sentence when described
Disconnected result be less than when, then jump to step b, otherwise, jump to step c；
Step b, updates the pixel value of the corresponding current pixel position for building reference frame of the former frame encoded image；
Step c, does not update the pixel value of the corresponding current pixel position for building reference frame of the former frame encoded image；
According to step a- step c, the picture of each location of pixels for building reference frame corresponding to the former frame encoded image
Plain value is processed, and generates the corresponding structure reference frame of current image to be encoded.
4. method according to claim 3, it is characterised in that before step a, methods described also includes：
Judge whether the place predicting unit of the current pixel position of the current encoded image is encoded using skip mode；
When the judged result is to be, then step c is jumped to；Otherwise, jump to step a.
5. the method according to claim 3 or 4, it is characterised in that the renewal former frame encoded image correspondence
Structure reference frame current pixel position the step of include：
The pixel value of the current pixel position of the current encoded image is corresponding with the former frame encoded image
Build being weighted with the pixel value of the current pixel position corresponding position in reference frame, generate result of calculation；
Using the result of calculation, the corresponding current pixel position for building reference frame of the former frame encoded image is updated
Put the pixel value of corresponding position.
6. a kind of coding/decoding method of Video Codec, it is characterised in that include：
Obtain the corresponding former frame of the image of decoding of the former frame of current image to be decoded and the current image to be decoded
The corresponding structure reference frame of image is decoded；It is described build reference frame be according to the front cross frame of the current image to be decoded
The corresponding prognostic chart picture of the image of decoding of decoding image and the front cross frame is produced；
According to it is described decoded image update described in former frame decoded the corresponding structure reference frame of image, described in after renewal
Former frame has decoded the corresponding reference frame that builds of image as the corresponding structure reference frame of the current image to be decoded；
Using the current image to be decoded corresponding reference frame that builds as reference picture, the current image to be decoded is carried out
Decoding.
7. method according to claim 6, it is characterised in that former frame described in image update has been decoded described in the basis
Decoded the corresponding structure reference frame of image, using renewal after the former frame decoded image it is corresponding build reference frame as
The current image to be decoded is corresponding to be included the step of build reference frame：
According to it is described currently decoded image and it is described currently decoded image corresponding to prognostic chart picture between relation, calculate
The decoded residual of each location of pixels for currently having decoded image；
According to the decoded residual of each location of pixels for currently having decoded image, image correspondence is decoded to the former frame
The pixel value of each location of pixels of structure reference frame processed, generate that the current image to be decoded is corresponding to build ginseng
Examine frame.
8. method according to claim 7, it is characterised in that described according to described each pixel for currently having decoded image
The decoded residual of position, the pixel value that corresponding each location of pixels for building reference frame of image has been decoded to the former frame are entered
Row is processed, and generating the step of current image to be decoded is corresponding to build reference frame includes：
Whether step a, judge the decoded residual of the current pixel position for currently having decoded image less than threshold value；Sentence when described
Disconnected result be less than when, then jump to step b, otherwise, jump to step c；
Step b, updates the pixel value that the former frame has decoded the corresponding current pixel position for building reference frame of image；
Step c, does not update the pixel value that the former frame has decoded the corresponding current pixel position for building reference frame of image；
According to step a- step c, the picture of corresponding each location of pixels for building reference frame of image is decoded to the former frame
Plain value is processed, and generates the corresponding structure reference frame of current image to be decoded.
9. method according to claim 8, it is characterised in that before step a, methods described also includes：
Judge whether the place predicting unit of the current pixel position for currently having decoded image is decoded using skip mode；
When the judged result is to be, then step c is jumped to；Otherwise, jump to step a.
10. method according to claim 8 or claim 9, it is characterised in that the renewal former frame has decoded image correspondence
Structure reference frame current pixel position the step of include：
The pixel value of the current pixel position for currently having decoded image image is decoded into the former frame corresponding
Build being weighted with the pixel value of the current pixel position corresponding position in reference frame, generate result of calculation；
Using the result of calculation, update the former frame and decoded the corresponding current pixel position for building reference frame of image
Put the pixel value of corresponding position.
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