CN108702510A - A kind of coding method and device - Google Patents
A kind of coding method and device Download PDFInfo
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- CN108702510A CN108702510A CN201780008551.4A CN201780008551A CN108702510A CN 108702510 A CN108702510 A CN 108702510A CN 201780008551 A CN201780008551 A CN 201780008551A CN 108702510 A CN108702510 A CN 108702510A
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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
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
- H04N19/159—Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
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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
- 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
Abstract
Provide a kind of coding method and device.The coding method includes:Current image block to be encoded is obtained, current image block is any image block in I frames or I bands;Interframe encode is carried out to current image block;Determine whether current image block will produce flicker according to interframe encode information;If current image block will produce flicker, intraframe coding is carried out to rebuilding image block;According to intraframe coding as a result, generating the corresponding code stream information of current image block.Technical solution provided by the present application judges whether the intraframe coding of current image block can lead to scintillation effect based on interframe encode information.If the intraframe coding of current image block can lead to scintillation effect, replaces current image block to carry out intraframe coding using the reconstruction image block that interframe encode obtains, flicker level of the video content in playing process can be reduced to a certain extent.
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
This application involves field of video encoding, and more specifically, are related to a kind of coding method and device.
Background technology
I frames are alternatively referred to as (intra) coded frame in frame sometimes, are the key frames in video image.I frames are a kind of included complete
The independent frame of portion's information generally can independently carry out encoding and decoding without necessarily referring to other picture frames.
P frames (or B frames) are alternatively referred to as interframe (inter) coded frame and need to join using inter-frame coding sometimes
The information for examining other picture frames carries out encoding and decoding.Interframe encode is equivalent to has carried out time low-pass filtering to image so that continuous
The P frame similitudes of appearance are strong.Therefore, in video display process, if the video content played is to be carried in video in P frames
Hold, human eye may feel that the playing process of video content is very smooth (smooth).
In order to realize the fault-tolerant or random access (as realized the fast forward and fast reverse in video display process) of video content,
In video coding process, it will usually periodically encode I frames.But the I frames periodically occurred can block the smooth of video content
It propagates, the video content that human eye is watched is caused to flicker.
Invention content
A kind of coding method of the application offer and device, can reduce the flicker level of video to a certain degree.
In a first aspect, a kind of coding method is provided, including:Obtain current image block to be encoded, the current image block
For any image block in I frames or I bands;Interframe encode is carried out to the current image block, obtains the current image block
Interframe encode information, the interframe encode information include the reconstruction image block of the current image block;According to the interframe encode
Information, determines whether the current image block will produce flicker;If the current image block will produce flicker, to the reconstruction
Image block carries out intraframe coding, obtains the intraframe coding result of the current image block;According to the intraframe coding as a result, generating
The corresponding code stream information of the current image block.
Second aspect provides a kind of encoder, including:Memory, for storing program;Processor, it is described for executing
The program stored in memory, when described program is performed, the processor is used to execute coding as described in relation to the first aspect
Method.
The third aspect provides a kind of image processing system, including:Image capturing system, for acquiring image;Such as second party
Encoder described in face obtains code stream information for being encoded to described image acquisition system the image collected;Image passes
Defeated system is used for transmission the code stream information.
Fourth aspect provides a kind of unmanned plane, includes the image processing system as described in the third aspect.
5th aspect, provides a kind of computer storage media, including computer instruction, when the computer instruction is calculating
When being run on machine so that the computer executes method as described in relation to the first aspect.
6th aspect, provides a kind of computer program product, when the computer program product is run on computers,
So that the computer executes the method described in first aspect.
Technical solution provided by the present application has changed the coding mode of traditional I frames or the image block in I bands, first to I frames
Or the current image block in I bands carries out interframe encode, and the intraframe coding of current image block is judged based on interframe encode information
Whether scintillation effect can be caused.If the intraframe coding of current image block can lead to scintillation effect, obtained using interframe encode
Reconstruction image block replace current image block carry out intraframe coding.Inter-frame coding has the characteristic of time low-pass filtering, because
This, is for having to carry out the I frames of intraframe coding or the current image block of I bands, current image block interframe encode obtains
Reconstruction image block may be more approximate with the video content of the correspondence image block in former frame or former frame images, to reconstruction image
Block carries out intraframe coding can avoid the video content after coding from larger saltus step occur to a certain extent, to drop to a certain extent
Low flicker level of the video content in playing process.
Description of the drawings
Fig. 1 is the exemplary plot of the arrangement of I frames.
Fig. 2 is the exemplary plot of the arrangement of I bands.
Fig. 3 is a kind of schematic diagram for the coded system that can apply the embodiment of the present invention.
Fig. 4 is the schematic flow chart of coding method provided in an embodiment of the present invention.
Fig. 5 is a kind of schematic flow chart of realization method of the step 430 in Fig. 4.
Fig. 6 is the schematic flow chart of another realization method of the step 430 in Fig. 4.
Fig. 7 is the exemplary plot of surrounding's image block of current image block provided in an embodiment of the present invention.
Fig. 8 is the schematic diagram of encoder provided in an embodiment of the present invention.
Fig. 9 is the schematic diagram of image processing system provided in an embodiment of the present invention.
Figure 10 is the schematic diagram of unmanned plane provided in an embodiment of the present invention.
Specific implementation mode
Technical solution provided by the present application can be applied to the relevant various systems of Video coding, such as coding and decoding video system
System, Video Storage System, Video transmission system, unmanned plane image transmission system etc..
Technical solution provided by the present application can be applied in various video encoding standards, such as H.263, H.264, H.265/
AVC (advanced video coding, advanced video coding), dynamic image expert group (moving picture experts
Group, MPEG) etc..
Above it has already been indicated that video coding process will produce I frames and P frames (or B frames).The appearance of I frames can block in video
The smooth propagation held, causing the video content that human eye is watched flicker occur, (this phenomenon is properly termed as the flicker effect of video
It answers).In order to make it easy to understand, the producing cause of the scintillation effect of video is described in detail below.
As shown in Figure 1, in video storage or field of video transmission, in order to realize the fault-tolerant or random access of video content
(fast forward and fast reverse in such as video display process), in video coding process, it will usually periodically encode I frames.Alternatively, such as
Shown in Fig. 2, the storage of the video of better user experience and network performance or field of video transmission (such as unmanned plane figure are needed certain
Biography field), in video coding process, it will usually based on gradually refreshing (gradual decoding refresh, GDR) technology
The periodically I bands (slice) in encoded image frame.
No matter video coding process is periodic code I frames or periodic code's I bands, generally can all generate video
Scintillation effect.By taking Fig. 1 as an example, P frames are encoded using interframe encoding mode, and interframe encode is equivalent to the P to continuously occurring
Frame carries out time low-pass filtering, and the P frames similarity system design continuously occurred can be made high, and human eye is in the corresponding video of viewing P frames
During appearance, it can feel that video content is very smooth.But use intraframe coding due to being periodically inserted in video content
The I frames of pattern-coding, such picture frame can block the smooth propagation of video content, and the periodical of video content is caused to dodge
It is bright.For the video content based on GDR technology for encoding, due to the position meeting cyclical movement of I bands, human eye can not only be felt
Feel the periodic flicker of video content, also may feel that the flickering position of video in movement, forms roller effect.
The embodiment of the present invention provides a kind of coding method, can reduce the flicker level of video.In order to make it easy to understand, first tying
Close Fig. 3, pair can apply the embodiment of the present invention a kind of coded system 300 describe in detail.As shown in figure 3, compiling solution system 300
May include initialization module 310, motion estimation module 320, Inter-coding module 330, intraframe coding module 340 and entropy are compiled
Code module 350.
Initialization module 310 can be used for initializing video content to be encoded, such as to picture frame to be encoded into
Row block divides, and forms image block to be encoded (being alternatively referred to as macro block (macro bloack, MB) sometimes).Different video encoding and decoding
There is standard corresponding image block dividing mode, the embodiment of the present invention to be not especially limited to this.
Motion estimation module 320 can be used for carrying out estimation to current image block to be encoded, such as calculate present image
The motion vector (motion vector, MV) of block, reference image block etc..The information that motion estimation module 320 exports can be used as frame
Between coding information be input in Inter-coding module 330.
Inter-coding module 330 and intraframe coding module 340 can be respectively used to current image block carry out interframe encode and
Intraframe coding.Coded system 300 would generally choose one from the interframe encoding mode and/or intra-frame encoding mode of current image block
Kind coding mode encodes current image block.The coding mode for example can be interframe encoding mode or intra-frame encoding mode
In rate distortion costs minimum coding mode, i.e. optimal coding mode.It should be noted that (also may be used for P frames or P bands
To be B frames or B bands) for, coded system 300 would generally choose a kind of interframe encoding mode to working as from interframe encoding mode
Preceding image block is encoded;Relatively, for I frames or I bands, coded system 300 would generally be from intra-frame encoding mode
A kind of intra-frame encoding mode encodes current image block.For the present invention, can interframe all first be passed through to all frames
Coding module 330 first carries out interframe encode, then sees whether need intraframe coding, needs intraframe coding, is being confirmed whether to make
Intraframe coding is carried out with current image block, or rebuilds figure phase block and carries out intraframe coding;It can also judge whether need frame when frame
Interior coding, if it is determined that need intraframe coding, then determine the need for carrying out intraframe coding, do not limit here.
Data after entropy code module 350 can encode Inter-coding module 330 or intraframe coding module 340 carry out entropy
Encoding operation obtains code stream to be stored or to be transmitted.Fig. 4 is the schematic flow of coding method provided in an embodiment of the present invention
Figure.The coding method of Fig. 4 can for example be executed by encoder, such as video encoder.As shown in figure 4, the coding method can wrap
Include step 410-450.It describes in detail below to each step in Fig. 4.
In step 410, current image block to be encoded is obtained.The current image block can be times in I frames or I bands
One image block.
At step 420, interframe encode is carried out to current image block, obtains the interframe encode information of current image block.
Interframe encoding mode is alternatively referred to as inter-frame mode or inter patterns sometimes.At step 420, one kind may be used
Or a variety of Inter-coding modules carry out interframe encode to current image block.One or more interframe encoding modes can be according to reality
Border needs to choose, and can also determine that the embodiment of the present invention does not limit this according to the encoding and decoding standard of actual use.With
H.264/AVC for, which for example may include one kind or more in following interframe encoding mode
Kind:16 × 16 pattern of interframe, 16 × 8 pattern of interframe, 8 × 16 pattern of interframe, (8 × 8 pattern of interframe can be with for 8 × 8 pattern of interframe
It is further subdivided into 4 × 4 pattern of interframe) etc..
Further, in some embodiments, step 420 may include:Using optimal interframe encoding mode to currently scheming
As block progress interframe encode, the interframe encode information of current image block is obtained.The interframe encode information that step 420 obtains can manage
Solution be and certain relevant information of interframe encode.The information for example can be the information that interframe encode process generates, can also frame
Between the information that uses of cataloged procedure, can also be the information for including in interframe encode result, the embodiment of the present invention to this and it is unlimited
It is fixed.
Interframe encode information may include the reconstruction image block of current image block.Assuming that current image block is compiled with a kind of interframe
Pattern is encoded, then the reconstruction image block can be current image block corresponding reconstruction figure under the interframe encoding mode
As block.Assuming that current image block is encoded with a variety of interframe encoding modes, then the reconstruction image block can be a variety of frames
Between reconstruction under any one interframe encoding mode (it is target interframe encoding mode to call the coding mode in the following text) in coding mode
Image block.Optionally, in some embodiments, as long as estimating the rate distortion costs of a variety of interframe encoding modes, and according to a variety of
The rate distortion costs of interframe encoding mode choose target interframe encoding mode from a variety of interframe encoding modes, without being directed to
A variety of interframe encoding modes carry out an interframe encode.As an example, which can be above-mentioned
Optimal interframe encoding mode in a variety of interframe encoding modes.The optimal interframe encoding mode that the application refers to can for example refer to more
The interframe encoding mode of rate distortion costs minimum in kind interframe encoding mode.
Further, in some embodiments, interframe encode information can also include at least one of following information:When
The corresponding reference image block of preceding image block, corresponding motion vector of current image block etc..The corresponding reference picture of current image block
Block can be current image block where the corresponding reference image frame of current image frame in image block, and reference image frame and/
Or reference image block can be determined in the position of reference image frame by interframe encoding mode.Assuming that current image block is with a kind of interframe
Coding mode is encoded, then the corresponding reference image block of current image block can be current image block in the interframe encode mould
Corresponding reference image block under formula.
Assuming that current image block is encoded with a kind of interframe encoding mode, then the corresponding reference picture of current image block
Block can be current image block corresponding reference image block under the interframe encoding mode.Assuming that current image block is with a variety of interframe
Coding mode is encoded, then the corresponding reference image block of current image block can be that current image block is compiled in a variety of interframe
Corresponding reference image block under any one interframe encoding mode in pattern.As an example, current image block corresponds to
Reference image block can be corresponding under optimal interframe encoding mode of the current image block in above-mentioned a variety of interframe encoding modes
Reference image block.
Assuming that some image block (such as current image block or surrounding image block described below) is with a kind of interframe encoding mode
It is encoded, then the corresponding motion vector of the image block can be the image block corresponding movement under the interframe encoding mode
Vector.Assuming that the image block is encoded with a variety of interframe encoding modes, then the corresponding motion vector of the image block can be
Corresponding motion vector under any one interframe encoding mode of the image block in a variety of interframe encoding modes.As one
Example, the corresponding motion vector of the image block can be that optimal interframe of the image block in above-mentioned a variety of interframe encoding modes is compiled
Corresponding motion vector under pattern.
In step 430, determine whether current image block will produce flicker according to interframe encode information.
When current image block generation flicker can refer to the video content that video playing is included to current image block, video playing
Continuity interrupt, human eye feels that saltus step occurs in video content.
The realization method of step 430 can there are many, the embodiment of the present invention does not limit this.As an example, may be used
To determine whether current image block will produce flicker according to the reconstruction image block of current image block and the similitude of current image block.
It as another example, can be according to the phase of the reconstruction image block reference image block corresponding with current image block of current image block
Determine whether current image block will produce flicker like property.It, can be according to the corresponding movement of current image block as another example
The consistency of vector motion vector corresponding with the surrounding of current image block image block determines whether current image block will produce sudden strain of a muscle
It is bright.Certainly, in some embodiments, two or more in above-mentioned example can also be combined, to determine current image block
Whether flicker will produce.The specific implementation of step 430 is as detailed below, wouldn't be described in detail herein.
In step 440, if current image block will produce flicker, intraframe coding is carried out to rebuilding image block, is worked as
The intraframe coding result of preceding image block.
In conventional coding technology, either interframe encode or intraframe coding, coded object (or the source images of coding
Block) it is current image block.In the embodiment of the present invention, if it is judged that current image block will produce flicker, then weight may be used
It builds image block and carries out intraframe coding as coded object instead of current image block.Reconstruction image block is obtained based on interframe encode
Image block, inter-frame coding have the characteristic of time low-pass filtering, therefore, compared to current image block, reconstruction image block with
The video content of former frame or the correspondence image block in former frame images may be more nearly, and to rebuilding image block compile in frame
Code can avoid the video content after coding from larger saltus step occur to a certain extent, to reduce video content to a certain extent
Flicker level in playing process.
When needing to replace current image block to carry out intraframe coding using reconstruction image block, the corresponding quantization ginseng of intraframe coding
Number (quantization parameter, QP) quantization parameter corresponding with interframe encode may be the same or different.As
One example, in order to enable the intraframe coding result of current image block and former frame or the correspondence image block in former frame images
Video content is more nearly, and the corresponding quantization parameter of intraframe coding can be set smaller than to the corresponding quantization ginseng of interframe encode
Number.Optionally, in some embodiments, during intraframe coding, coded data can not be quantified, so as to
Avoid the distortion of the video content of quantizing process generation.
The corresponding quantization parameter of intraframe coding can be preset, can also be in line computation.With in line computation intraframe coding
For corresponding quantization parameter, based on the corresponding quantization parameter of intraframe coding, to rebuilding before image block carries out intraframe coding,
It can first be compiled in frame according to the corresponding quantization parameter of interframe encode and the corresponding quantization parameter of preset interframe encode
The difference of the corresponding quantization parameter of code, determines the corresponding quantization parameter of intra-frame encoding mode.For example, it is assumed that interframe encode is corresponding
Quantization parameter is inter_qp, and formula intra_qp=inter_qp-delta_qp may be used and determine that intraframe coding is corresponding
Quantization parameter.Intra_qp can indicate that the corresponding quantization parameter of intraframe coding, delta_qp can indicate that interframe encode corresponds to
Quantization parameter quantization parameter corresponding with intraframe coding difference.The value of delta_qp can be positive integer, such as can be with
It is greater than 3 positive integer.
Optionally, in some embodiments, the method for Fig. 4 may also include:If current image block not will produce flicker, can
To carry out intraframe coding to current image block, the intraframe coding result of current image block is obtained.
In step 450, according to intraframe coding as a result, generating the corresponding code stream information of current image block.
For example, can be based on traditional approach carries out subsequent processing to intraframe coding result, to generate code stream information.Such as Fig. 1
It is shown, the operations such as entropy coding can be carried out to intraframe coding result.For another example, before the entropy encoding, data can also be gone
The operations such as block (deblocking) filtering.
The embodiment of the present invention has changed the coding mode of traditional I frames or the image block in I bands, first in I frames or I bands
Current image block carry out interframe encode, and judge whether the intraframe coding of current image block can cause based on interframe encode information
Scintillation effect.If the intraframe coding of current image block can lead to scintillation effect, the reconstruction image that is obtained using interframe encode
Block replaces current image block to carry out intraframe coding.Inter-frame coding has the characteristic of time low-pass filtering, therefore, compared to working as
Preceding image block, reconstruction image block may be more approximate with the video content of the correspondence image block in former frame or former frame images,
The video content after coding can be avoided larger saltus step occur to a certain extent to rebuilding image block progress intraframe coding, to one
Determine to reduce flicker level of the video content in playing process in degree.
With reference to specific embodiment, the realization method of step 430 is illustrated.
As an example, interframe encode information may also include the corresponding reference image block of current image block.In the example
In, as shown in figure 5, step 430 may include step 432-434.
In step 432, the similarity of reconstruction image block and reference image block is determined.
In step 434, according to the similarity of reconstruction image block and reference image block, determine whether current image block can produce
Raw flicker.
The measurement mode of similarity between reconstruction image block and reference image block can there are many.For example, can compare
The absolute error of reconstruction image block and reference image block and (sum of absolute error, SAE) and/or error sum of squares
(sum of squares for error, SSE).
The specific implementation of step 434 is related with the definition mode of the value of similarity.Assuming that reconstruction image block and ginseng
The similarity for examining image block is higher, and the value of the similarity of reconstruction image block and reference image block is bigger, then step 434 can wrap
It includes:If similarity is less than or is less than or equal to the first predetermined threshold value, determine that current image block will produce flicker.Further, exist
In some embodiments, step 434 can also include:If similarity is more than or is more than or equal to the first predetermined threshold value, determine current
Image block not will produce flicker.Assuming that the similarity of reconstruction image block and reference image block is higher, reconstruction image block and reference chart
As the value of the similarity of block is smaller, then step 434 may include:If similarity is more than or is more than or equal to the first default threshold
Value, determines that current image block will produce flicker.Further, in some embodiments, step 434 can also include:If phase
It is less than or is less than or equal to the first predetermined threshold value like degree, determines that current image block not will produce flicker.
Since interframe encode has the characteristic of time low-pass filtering, except non-video content itself mutates, rebuild
Similitude between image block and reference image block is generally higher (or difference is smaller).Therefore, if reconstruction image block and reference
Image block similarity is relatively low (or differing greatly), it can be understood as video content itself mutates, for example, the field that video is described
For scape suddenly from a scene switching to another entirely different scene, this belongs to the natural trend of video content, not due to
Coding and caused by video scintillation effect.In this case, judgement of embodiment of the present invention current image block not will produce sudden strain of a muscle
It is bright, it still can be used and directly carry out the mode of intraframe coding to current image block and generate the intraframe coding result of current image block.This
Inventive embodiments can distinguish the flicker of the burst-normal and video content of video content, and use different coding plans
Slightly, so as to improve the coding quality of video.
Since the corresponding reconstruction image block of current image block is similar with current image block, it in some embodiments, can
Using directly by current image block as the corresponding reconstruction image block of current image block.Alternatively, in some embodiments, Fig. 5 is implemented
Step 434 in example could alternatively be the similarity according to current image block and reference image block, whether determine current image block
It will produce flicker.
As another example, interframe encode information may also include the corresponding motion vector of current image block.Such as Fig. 6 institutes
Show, step 430 may include step 436-438.
In step 436, determine that surrounding's image block of the corresponding motion vector of current image block and current image block corresponds to
Motion vector difference.
Surrounding's image block of current image block can refer to the image block that coding is completed around current image block.Current figure
As block surrounding's image block definition mode can there are many.For example, surrounding's image block of current image block may include current
The adjacent image block of image block.For another example, surrounding's image block of current image block may include the adjacent image block of current image block
Adjacent image block.In addition, surrounding's image block of current image block may include an image block, it can also be including two even
More image blocks.
Below by taking the surrounding of current image block image block is the adjacent image block of current image block as an example, present image is provided
A kind of possible definition mode of surrounding's image block of block.As shown in Figure 7, it is assumed that current image block is image block X, then image block
Surrounding's image block of X may include image block A, image block B, image block C and image block D.Alternatively, scheming around image block X
As block can be image block A and image block B.
In step 438, according to the corresponding motion vector of current image block and the corresponding motion vector of surrounding image block
Difference, determines whether current image block will produce flicker.
Except non-video content itself mutates, the corresponding motion vector of current image block and the corresponding fortune of surrounding image block
The difference of dynamic vector is typically small.Therefore, the corresponding motion vector of current image block and the corresponding motion vector of surrounding image block
Differ greatly, it can be understood as video content itself mutates, for example, video describe scene cut suddenly from a scene
Another entirely different scene is changed to, this belongs to the natural trend of video content, video caused by not due to coding
Scintillation effect.In this case, judgement of embodiment of the present invention current image block not will produce flicker, still use to present image
The mode that block directly carries out intraframe coding generates the intraframe coding result of current image block.The embodiment of the present invention can be in video
The flicker of the burst-normal and video content of appearance distinguishes, and uses different coding strategies, so as to improve video
Coding quality.
The definition mode of the difference of the corresponding motion vector of current image block and the corresponding motion vector of surrounding image block can
There are many.For example, the difference of the corresponding motion vector of current image block and the corresponding motion vector of surrounding image block can determine
Justice is the minimum value of the difference of the corresponding motion vector of current image block and the corresponding motion vector of each surrounding image block.For another example,
The difference of the corresponding motion vector of current image block and the corresponding motion vector of surrounding image block can be defined as current image block
The average value of the difference of corresponding motion vector and the corresponding motion vector of each surrounding image block.
If step 438 may include the corresponding motion vector of current image block motion vector corresponding with surrounding image block
Difference be less than or be less than or equal to the second predetermined threshold value, determine that current image block will produce flicker.Further, in some implementations
In example, if step 438 can also include the corresponding motion vector of current image block motion vector corresponding with surrounding image block
Difference be more than the second predetermined threshold value, determine that current image block not will produce flicker.
Illustratively, with current image block for image block X as shown in Figure 7, surrounding's image block of current image block is such as
It is illustrated for image block A-D shown in Fig. 7.
Assuming that the corresponding motion vectors of image block X are mvx.The corresponding motion vectors of image block A-D are respectively mvx, mva,
mvb, mvcAnd mvd。mvxComponent along the directions x and y uses mv respectivelyxxAnd mvyyIt indicates.mvaComponent along the directions x and y is used respectively
mvaxAnd mvayIt indicates.mvbComponent along the directions x and y uses mv respectivelybxAnd mvbyIt indicates.mvcComponent along the directions x and y is used respectively
mvcxAnd mvcyIt indicates.mvdComponent along the directions x and y uses mv respectivelydxAnd mvdyIt indicates.The corresponding motion vector of current image block
Around the difference mv_diff of the corresponding motion vector of image block may be used following formula and calculate:
Mv_diff=(mv_diffa+mv_diffb+mv_diffc+mv_diffd)/8, wherein:
mv_diffa=ABS (mvxx-mvax)+ABS(mvxy-mvay);
mv_diffb=ABS (mvxx-mvbx)+ABS(mvxy-mvby);
mv_diffc=ABS (mvxx-mvcx)+ABS(mvxy-mvcy);And
mv_diffd=ABS (mvxx-mvdx)+ABS(mvxy-mvdy)。
It then, can be by mv_diff compared with the second predetermined threshold value mv_thres.If mv_diff is more than mv_thres,
It may be considered that the differing greatly of the corresponding motion vector of current image block motion vector corresponding with surrounding image block (or it is consistent
Property is poor).If mv_diff is less than mv_thres, it may be considered that the corresponding motion vector of current image block and surrounding image
The difference of the corresponding motion vector of block is smaller (or consistency is preferable).Mv_thres can determine empirically or experimentally, mv_
Thres is for example, it can be set to be 6, or be set as 8.
It should be noted that the embodiment of Fig. 6 can be to be individually performed, can also be combined with the embodiment of Fig. 5.Example
Such as, judge that the similarity of reconstruction image block and reference image block is higher (more than the first default threshold in the embodiment by Fig. 5
Value) after, the embodiment of Fig. 6 can be further executed, judges the corresponding motion vector of current image block and current image block
The difference (such as whether the difference is more than the second predetermined threshold value) of the corresponding motion vector of surrounding image block, and Fig. 6 embodiments are obtained
The result arrived is as final result.Alternatively, can judge the corresponding movement of current image block first with embodiment shown in fig. 6
The difference of the corresponding motion vector of surrounding's image block of vector sum current image block, if it is judged that the corresponding fortune of current image block
(such as the difference is more than the second default threshold for the differing greatly of the corresponding motion vector of the surrounding of dynamic vector and current image block image block
Value), then the embodiment of Fig. 5 can be further executed, judges that the similarity of reconstruction image block and reference image block (such as judges similar
Whether degree is more than the first predetermined threshold value), and the result that Fig. 5 embodiments are obtained is as final result.
The embodiment of the present invention additionally provides a kind of encoder.As shown in figure 8, the encoder 800 may include memory 810
With processor 820.Memory 810 can be used for storing program.Processor 820 can be used for executing the program stored in memory 810.
When the program is performed, processor 820 can be used for obtaining current image block to be encoded, and the current image block is I frames or I
Any image block in band;Interframe encode is carried out to the current image block, obtains the interframe encode of the current image block
Information, the interframe encode information include the reconstruction image block of the current image block;According to the interframe encode information, determine
Whether the current image block will produce flicker;If the current image block will produce flicker, to the reconstruction image block into
Row intraframe coding obtains the intraframe coding result of the current image block;According to the intraframe coding as a result, generating described current
The corresponding code stream information of image block.
Optionally, in some embodiments, the interframe encode information further includes the corresponding reference of the current image block
Image block, the processor 820 are used to determine the similarity of the reconstruction image block and the reference image block;According to described heavy
The similarity for building image block and the reference image block, determines whether the current image block will produce flicker.
Optionally, in some embodiments, if the processor 820 is less than for the similarity or less than or equal to the
One predetermined threshold value determines that the current image block will produce flicker.
Optionally, in some embodiments, it is preset if the processor 820 is more than or equal to first for the similarity
Threshold value determines that the current image block not will produce flicker.
Optionally, in some embodiments, the reference image block is the current image block in optimal interframe encode mould
Corresponding reference image block under formula.
Optionally, in some embodiments, the reference image block is the current image frame where the current image block
Image block in corresponding reference image frame, and position of the reference image block in the reference image frame is by described optimal
Interframe encoding mode determines.
Optionally, in some embodiments, the interframe encode information further includes the corresponding movement of the current image block
Vector, the processor 820 is for determining around the corresponding motion vector of the current image block and the current image block
The difference of the corresponding motion vector of image block;According to the corresponding motion vector of the current image block and the surrounding image block pair
The difference for the motion vector answered, determines whether the current image block will produce flicker.
Optionally, in some embodiments, if the processor 820 is for the corresponding movement arrow of the current image block
The difference of amount motion vector corresponding with the surrounding image block is less than or is less than or equal to the second predetermined threshold value, determines described current
Image block will produce flicker.
Optionally, in some embodiments, if the processor 820 is for the corresponding movement arrow of the current image block
The difference of amount motion vector corresponding with the surrounding image block is more than second predetermined threshold value, determines the current image block
Flicker is not will produce.
Optionally, in some embodiments, the surrounding image block is the adjacent image block of the current image block.
Optionally, in some embodiments, the corresponding motion vector of the current image block is the current image block
The corresponding motion vector of optimal interframe encoding mode.
Optionally, in some embodiments, the corresponding motion vector of the surrounding image block is the surrounding image block
The corresponding motion vector of optimal interframe encoding mode.
Optionally, in some embodiments, the processor 820 is used to be based on the corresponding quantization parameter of intraframe coding, right
The reconstruction image block carries out the intraframe coding, wherein the corresponding quantization parameter of the intraframe coding is less than the interframe encode
Corresponding quantization parameter.
Optionally, in some embodiments, the processor 820 is additionally operable to according to the corresponding quantization ginseng of the interframe encode
The difference of number and the corresponding quantization parameter of preset interframe encode quantization parameter corresponding with the intraframe coding
Value, determines the corresponding quantization parameter of the intra-frame encoding mode.
Optionally, in some embodiments, if the processor 820 is additionally operable to the current image block and not will produce sudden strain of a muscle
It is bright, intraframe coding is carried out to the current image block, obtains the intraframe coding result of the current image block.
Optionally, in some embodiments, the processor 820 is used to carry out entropy coding to the intraframe coding result,
Obtain the corresponding code stream information of the current image block.
The embodiment of the present invention additionally provides a kind of image processing system.As shown in figure 9, the image processing system 900 can be with
Including image capturing system 910, encoder 800 and image delivering system 920.Encoder 800 can be used for Image Acquisition system
910 the image collected of uniting are encoded, and code stream information is obtained.Image delivering system 920 can be used for transmission code stream information.
The embodiment of the present invention also provides a kind of unmanned plane.As shown in Figure 10, which may include image procossing
System 900.Further, unmanned plane 1000 can also include shell, and image processing system 900 can be located at enclosure interior.
In the above-described embodiments, can come wholly or partly by software, hardware, firmware or any other combination real
It is existing.When implemented in software, it can entirely or partly realize in the form of a computer program product.The computer program
Product includes one or more computer instructions.When loading on computers and executing the computer program instructions, all or
It partly generates according to the flow or function described in the embodiment of the present invention.The computer can be all-purpose computer, special meter
Calculation machine, computer network or other programmable devices.The computer instruction can be stored in computer readable storage medium
In, or from a computer readable storage medium to the transmission of another computer readable storage medium, for example, the computer
Instruction can pass through wired (such as coaxial cable, optical fiber, number from a web-site, computer, server or data center
User's line (digital subscriber line, DSL)) or wireless (such as infrared, wireless, microwave etc.) mode to another
Web-site, computer, server or data center are transmitted.The computer readable storage medium can be computer capacity
Any usable medium enough accessed is either deposited comprising data such as one or more usable mediums integrated server, data centers
Store up equipment.The usable medium can be magnetic medium (for example, floppy disk, hard disk, tape), optical medium (such as digital video light
Disk (digital video disc, DVD)) or semiconductor medium (such as solid state disk (solid state disk,
SSD)) etc..
It should be noted that under the premise of not conflicting, in each embodiment described herein and/or each embodiment
Technical characteristic can arbitrarily be combined with each other, the protection domain of the application should also be fallen by combining the technical solution that obtains later.
Those of ordinary skill in the art may realize that lists described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, depends on the specific application and design constraint of technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
Scope of the present application.
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 division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be the indirect coupling by some interfaces, device or unit
It closes or communicates to connect, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the application can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.
The above, the only specific implementation mode of the application, but the protection domain of the application is not limited thereto, it is any
Those familiar with the art can easily think of the change or the replacement in the technical scope that the application discloses, and should all contain
It covers within the protection domain of the application.Therefore, the protection domain of the application should be based on the protection scope of the described claims.
Claims (36)
1. a kind of coding method, which is characterized in that including:
Current image block to be encoded is obtained, the current image block is any image block in I frames or I bands;
Interframe encode is carried out to the current image block, obtains the interframe encode information of the current image block, the interframe is compiled
Code information includes the reconstruction image block of the current image block;
According to the interframe encode information, determine whether the current image block will produce flicker;
If the current image block will produce flicker, intraframe coding is carried out to the reconstruction image block, obtains the current figure
As the intraframe coding result of block;
According to the intraframe coding as a result, generating the corresponding code stream information of the current image block.
2. coding method as described in claim 1, which is characterized in that the interframe encode information further includes the present image
The corresponding reference image block of block,
It is described to determine whether the current image block will produce flicker according to the interframe encode information, including:
Determine the similarity of the reconstruction image block and the reference image block;
According to the similarity of the reconstruction image block and the reference image block, determine whether the current image block will produce sudden strain of a muscle
It is bright.
3. coding method as claimed in claim 2, which is characterized in that described according to the reconstruction image block and the reference chart
As the similarity of block, determine whether the current image block will produce flicker, including:
If the similarity is less than or is less than or equal to the first predetermined threshold value, determine that the current image block will produce flicker.
4. coding method as claimed in claim 3, which is characterized in that described according to the reconstruction image block and the reference chart
It as the similarity of block, determines whether the current image block will produce flicker, further includes:
If the similarity is more than first predetermined threshold value, determine that the current image block not will produce flicker.
5. the coding method as described in any one of claim 2-4, which is characterized in that the reference image block is described current
Image block corresponding reference image block under optimal interframe encoding mode.
6. coding method as claimed in claim 5, which is characterized in that the reference image block is current image block place
The corresponding reference image frame of current image frame in image block, and position of the reference image block in the reference image frame
It sets and is determined by the optimal interframe encoding mode.
7. such as claim 1-3, the coding method described in any one of 5,6, which is characterized in that the interframe encode information is also wrapped
The corresponding motion vector of the current image block is included,
It is described to determine whether the current image block will produce flicker according to the interframe encode information, including:
Determine the corresponding movement arrow of surrounding's image block of the corresponding motion vector of the current image block and the current image block
The difference of amount;
According to the difference of the corresponding motion vector of the current image block and the corresponding motion vector of the surrounding image block, determine
Whether the current image block will produce flicker.
8. coding method as claimed in claim 7, which is characterized in that described to be sweared according to the corresponding movement of the current image block
The difference of amount motion vector corresponding with the surrounding image block, determines whether the current image block will produce flicker, including:
If the difference of the corresponding motion vector of current image block motion vector corresponding with the surrounding image block is less than
Or it is less than or equal to the second predetermined threshold value, determine that the current image block will produce flicker.
9. coding method as claimed in claim 8, which is characterized in that described to be sweared according to the corresponding movement of the current image block
The difference of amount motion vector corresponding with the surrounding image block, determines whether the current image block will produce flicker, also wraps
It includes:
If the difference of the corresponding motion vector of current image block motion vector corresponding with the surrounding image block is more than
Second predetermined threshold value determines that the current image block not will produce flicker.
10. coding method as claimed in any one of claims 7-9, which is characterized in that the surrounding image block is described works as
The adjacent image block of preceding image block.
11. the coding method as described in any one of claim 7-10, which is characterized in that the corresponding fortune of the current image block
Dynamic vector is the corresponding motion vector of optimal interframe encoding mode of the current image block.
12. the coding method as described in any one of claim 7-11, which is characterized in that the corresponding fortune of the surrounding image block
Dynamic vector is the corresponding motion vector of optimal interframe encoding mode of the surrounding image block.
13. the coding method as described in any one of claim 1-12, which is characterized in that it is described to the reconstruction image block into
Row intraframe coding, including:
Based on the corresponding quantization parameter of intraframe coding, the intraframe coding is carried out to the reconstruction image block, wherein in the frame
It encodes corresponding quantization parameter and is less than the corresponding quantization parameter of the interframe encode.
14. coding method as claimed in claim 13, which is characterized in that described based on the corresponding quantization ginseng of intraframe coding
Number, before carrying out the intraframe coding to the reconstruction image block, the coding method further includes:
According to the corresponding quantization parameter of the interframe encode and the corresponding quantization parameter of the preset interframe encode with
The difference of the corresponding quantization parameter of the intraframe coding, determines the corresponding quantization parameter of the intra-frame encoding mode.
15. the coding method as described in any one of claim 1-14, which is characterized in that the coding method further includes:
If the current image block not will produce flicker, intraframe coding is carried out to the current image block, is obtained described current
The intraframe coding result of image block.
16. the coding method as described in any one of claim 1-15, which is characterized in that described according to the intraframe coding knot
Fruit generates the corresponding code stream information of the current image block, including:
Entropy coding is carried out to the intraframe coding result, obtains the corresponding code stream information of the current image block.
17. a kind of encoder, which is characterized in that including:
Memory, for storing program;
Processor, for executing the program stored in the memory, when described program is performed, the processor is for obtaining
It is any image block in I frames or I bands to take current image block to be encoded, the current image block;To the present image
Block carries out interframe encode, obtains the interframe encode information of the current image block, and the interframe encode information includes described current
The reconstruction image block of image block;According to the interframe encode information, determine whether the current image block will produce flicker;If
The current image block will produce flicker, carries out intraframe coding to the reconstruction image block, obtains the frame of the current image block
Interior coding result;According to the intraframe coding as a result, generating the corresponding code stream information of the current image block.
18. encoder as claimed in claim 17, which is characterized in that the interframe encode information further includes the present image
The corresponding reference image block of block, the processor are used to determine the similarity of the reconstruction image block and the reference image block;
According to the similarity of the reconstruction image block and the reference image block, determine whether the current image block will produce flicker.
19. encoder as claimed in claim 18, which is characterized in that if the processor be less than for the similarity or
Less than or equal to the first predetermined threshold value, determine that the current image block will produce flicker.
20. encoder as claimed in claim 19, which is characterized in that if the processor for the similarity be more than etc.
In the first predetermined threshold value, determine that the current image block not will produce flicker.
21. the encoder as described in any one of claim 18-20, which is characterized in that the reference image block is described works as
Preceding image block corresponding reference image block under optimal interframe encoding mode.
22. encoder as claimed in claim 21, which is characterized in that the reference image block is current image block place
The corresponding reference image frame of current image frame in image block, and position of the reference image block in the reference image frame
It sets and is determined by the optimal interframe encoding mode.
23. such as claim 17-19, the encoder described in any one of 21,22, which is characterized in that the interframe encode information
Further include the corresponding motion vector of the current image block, the processor is for determining the corresponding movement of the current image block
The difference of the corresponding motion vector of surrounding's image block of current image block described in vector sum;It is corresponding according to the current image block
The difference of motion vector and the corresponding motion vector of the surrounding image block, determines whether the current image block will produce sudden strain of a muscle
It is bright.
24. encoder as claimed in claim 23, which is characterized in that if the processor is used for the current image block pair
The difference of the motion vector answered motion vector corresponding with the surrounding image block is less than or is less than or equal to the second predetermined threshold value, really
The fixed current image block will produce flicker.
25. encoder as claimed in claim 24, which is characterized in that if the processor is used for the current image block pair
The difference of the motion vector answered motion vector corresponding with the surrounding image block be more than second predetermined threshold value, determine described in
Current image block not will produce flicker.
26. the encoder as described in any one of claim 23-25, which is characterized in that the surrounding image block is described works as
The adjacent image block of preceding image block.
27. the encoder as described in any one of claim 23-26, which is characterized in that the corresponding fortune of the current image block
Dynamic vector is the corresponding motion vector of optimal interframe encoding mode of the current image block.
28. the encoder as described in any one of claim 23-27, which is characterized in that the corresponding fortune of the surrounding image block
Dynamic vector is the corresponding motion vector of optimal interframe encoding mode of the surrounding image block.
29. the encoder as described in any one of claim 17-28, which is characterized in that the processor is used for based in frame
Corresponding quantization parameter is encoded, the intraframe coding is carried out to the reconstruction image block, wherein the corresponding amount of the intraframe coding
Change parameter and is less than the corresponding quantization parameter of the interframe encode.
30. encoder as claimed in claim 29, which is characterized in that the processor is additionally operable to according to the interframe encode pair
The quantization parameter answered and the quantization corresponding with the intraframe coding of the corresponding quantization parameter of the preset interframe encode
The difference of parameter determines the corresponding quantization parameter of the intra-frame encoding mode.
31. the encoder as described in any one of claim 17-30, which is characterized in that if the processor is additionally operable to institute
It states current image block and not will produce flicker, intraframe coding is carried out to the current image block, obtains the frame of the current image block
Interior coding result.
32. the encoder as described in any one of claim 17-31, which is characterized in that the processor is used for the frame
Interior coding result carries out entropy coding, obtains the corresponding code stream information of the current image block.
33. a kind of image processing system, which is characterized in that including:
Image capturing system, for acquiring image;
Encoder as described in any one of claim 17-32, for described image acquisition system the image collected into
Row coding, obtains code stream information;
Image delivering system is used for transmission the code stream information.
34. a kind of unmanned plane, which is characterized in that including image processing system as claimed in claim 33.
35. a kind of computer storage media, which is characterized in that including computer instruction, when the computer instruction is in computer
When upper operation so that the computer executes the method as described in any one of claim 1-16.
36. a kind of computer program product, which is characterized in that when the computer program product is run on computers, make
Obtain method of the computer execution as described in any one of claim 1-16.
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| PCT/CN2017/108651 WO2019084792A1 (en) | 2017-10-31 | 2017-10-31 | Coding method and device |
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