CN107026963A - Dual coding web camera and its coding method - Google Patents
Dual coding web camera and its coding method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
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- H—ELECTRICITY
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Abstract
The invention belongs to web camera technical field, the invention provides a kind of dual coding web camera and its coding method, dual coding web camera includes image acquisition units, AD conversion unit, string and data generating unit, H.264/SVAC coding unit, first network transmission unit and the second network transmitting unit；AD conversion unit carries out video data to export yuv format video data signal after analog-to-digital conversion；Go here and there and yuv format video data is carried out output serial video data signal and parallel video data-signal after serioparallel exchange by data generating unit；H.264/SVAC coding unit obtains H.264 video flowing and SVAC video flowings after being encoded to serial video data signal and parallel video data-signal, and H.264 video flowing and SVAC video flowings will be transmitted respectively by first network transmission unit and the second NE, realize while exporting H.264 video flowing and SVAC video flowings.
Description
Technical field
The invention belongs to web camera technical field, more particularly to dual coding web camera and its coding method.
Background technology
With the progressively construction of smart city, security protection web camera act as more and more important effect, mesh wherein
Before, web camera carries out encoding and decoding, all SVAC standards that do not meet to employing SVAC standards in the transmission of graph image again
Equipment can not all access smart city system.And in the network such as other public security and traffic, at present then using traditional
H.264 standard carries out encoding and decoding, therefore, and exist causes according to difference in the prior art as a result of different encoding and decoding standards
The problem of image information that standard is obtained can not realize real-time Transmission and be shared.
The content of the invention
The present invention provides dual coding web camera and its coding method, solves to exist as a result of not in the prior art
Same encoding and decoding standard causes the problem of image information obtained according to various criterion can not realize real-time Transmission and be shared.
First aspect present invention provides a kind of dual coding web camera, and the dual coding web camera is adopted including image
Collect unit, AD conversion unit, string and data generating unit, H.264/SVAC coding unit, first network transmission unit and
Second network transmitting unit；
Described image collecting unit obtains video data；
The AD conversion unit carries out the video data to export yuv format video data signal after analog-to-digital conversion；
Simultaneously the yuv format video data is carried out exporting serial video number after serioparallel exchange the string by data generating unit
It is believed that number and parallel video data-signal；
H.264/SVAC the coding unit enters to the serial video data signal and the parallel video data-signal
H.264 video flowing and SVAC video flowings are obtained after row coding, and the H.264 video flowing and the SVAC video flowings are led to respectively
Cross the first network transmission unit and second NE is transmitted.
With reference in a first aspect, as the first embodiment of first aspect, the dual coding web camera also includes
Buffer cell；
The buffer cell is exported to the string again after carrying out data buffering duplication to the yuv format video data signal
And data generating unit.
With reference in a first aspect, as second of embodiment of first aspect, simultaneously data generating unit includes height to the string
Fast phaselocked loop, than bit pad and serializer；
It is described to carry out the parallel of processing generation lower-order digit with frequency doubling clock to the parallel data signal of input than bit pad
Data-signal；
The serializer receives the parallel data signal exported than bit pad, and is produced according to the high-speed phase-locked loop
Raw delay clock signal produces serial data signal.
With reference in a first aspect, as the third embodiment of first aspect,
H.264 the encoder to the parallel data signal by being predicted, converting and quantization and and entropy code
Etc. exporting H.264 video flowing after resume module；
The SVAC encoders by the serial data signal is predicted, converted with quantify and and entropy code at
SVAC video flowings are exported after reason.
With reference in a first aspect, as the 4th kind of embodiment of first aspect, the dual coding web camera also includes
Control unit and head；
Described control unit controls the head motion to obtain new video data according to video data.
With reference to second aspect, a kind of coding method of dual coding web camera, the dual coding web camera includes
Image acquisition units, AD conversion unit, string and data generating unit, H.264/SVAC coding unit, first network transmission are single
Member and the second network transmitting unit；
The coding method includes：
Described image collecting unit obtains video data；
The AD conversion unit carries out the video data to export yuv format video data signal after analog-to-digital conversion；
Simultaneously the yuv format video data is carried out exporting serial video number after serioparallel exchange the string by data generating unit
It is believed that number and parallel video data-signal；
H.264/SVAC the coding unit enters to the serial video data signal and the parallel video data-signal
H.264 video flowing and SVAC video flowings are obtained after row coding, and the H.264 video flowing and the SVAC video flowings are led to respectively
Cross the first network transmission unit and second NE is transmitted.
With reference to second aspect, as the first embodiment of second aspect, the dual coding web camera also includes
Buffer cell；
The coding method also includes：
The buffer cell is exported to the string again after carrying out data buffering duplication to the yuv format video data signal
And data generating unit.
With reference to second aspect, as second of embodiment of second aspect, simultaneously data generating unit includes height to the string
Fast phaselocked loop, than bit pad and serializer；
Simultaneously the yuv format video data is carried out exporting serial video number after serioparallel exchange the string by data generating unit
It is believed that number and parallel video data-signal, including：
It is described to carry out the parallel of processing generation lower-order digit with frequency doubling clock to the parallel data signal of input than bit pad
Data-signal；
The serializer receives the parallel data signal exported than bit pad, and is produced according to the high-speed phase-locked loop
Raw delay clock signal produces serial data signal.
With reference to second aspect, as the third embodiment of second aspect, the H.264/SVAC coding unit is to institute
State serial video data signal and the parallel video data-signal carry out coding output H.264 video flowing and SVAC video flowings,
Including：
H.264 the encoder to the parallel data signal by being predicted, converting and quantization and and entropy code
Etc. exporting H.264 video flowing after resume module；
The SVAC encoders by the serial data signal is predicted, converted with quantify and and entropy code at
SVAC video flowings are exported after reason.
With reference to second aspect, as the 4th kind of embodiment of second aspect, the dual coding web camera also includes
Control unit and head；
The coding method also includes：
Described control unit controls the head motion to obtain new video data according to video data.
The present invention provides a kind of dual coding web camera and its coding method, and list is H.264/SVAC encoded by setting
Member, realizes video data acquiring module and carries out SVAC codings and H.264 encode, be not simply 2 kinds of single videos
Module assembled in the same apparatus, and exports H.264 video flowing and SVAC video flowings simultaneously, it is to avoid in the prior art same
The security device that one place installs 2 and more than 2 carries out SVAC and the H.264 transmission of encoded data stream and causes pole respectively
The phenomenon wasted greatly.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
In required for the accompanying drawing that uses be briefly described, it should be apparent that, drawings in the following description are some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is a kind of structural representation for dual coding web camera that an embodiment of the present invention is provided；
Fig. 2 is a kind of structural representation for dual coding web camera that another embodiment of the invention is provided；
Fig. 3 is a kind of flow chart of the coding method of dual coding web camera provided in an embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is to explain the present invention, and without
It is of the invention in limiting.In order to illustrate technical scheme, illustrated below by specific embodiment.
The embodiment of the present invention one provides a kind of dual coding web camera 10, as shown in figure 1, dual coding web camera 10
Including image acquisition units 101, AD conversion unit 102, string and data generating unit 103, H.264/SVAC coding unit
104th, the network transmitting unit 106 of first network transmission unit 105 and second；
Image acquisition units 101 obtain video data；
AD conversion unit 102 carries out video data to export yuv format video data signal after analog-to-digital conversion；
Go here and there and yuv format video data is carried out output serial video data letter after serioparallel exchange by data generating unit 103
Number and parallel video data-signal；
H.264/SVAC coding unit 104 is obtained after being encoded to serial video data signal and parallel video data-signal
H.264 video flowing and SVAC video flowings are taken, and H.264 video flowing and SVAC video flowings will pass through first network transmission unit respectively
105 and second NE be transmitted.
In embodiments of the present invention, dual coding web camera 10 can be the various video cameras such as ball machine or gunlock, figure
As collecting unit 101 can be camera, for shooting video data.
In embodiments of the present invention, AD conversion unit 102 can use data conversion and 3A units, for by video counts
According to 24 yuv format video data signals are converted into, yuv format can be YUV422 forms or YUV444 forms.
In embodiments of the present invention, string and data generating unit 103 is used to receive parallel video data, and by parallel video
Data conversion is converted into serial video data, and export parallel video data and serially regard into low level after line delay of going forward side by side processing
Frequency evidence.
Specifically, as a kind of embodiment of string and data generating unit 103, going here and there and data generating unit 103 including
High-speed phase-locked loop, than bit pad and serializer；
The parallel data that processing produces lower-order digit is carried out with frequency doubling clock to the parallel data signal of input than bit pad
Signal；
Serializer receives the parallel data signal exported than bit pad, and the delay clock produced according to high-speed phase-locked loop
Signal produces serial data signal.
High-speed phase-locked loop includes control signal generator, voltage controlled oscillator and driver, and control signal generator receives two
Individual different clocks input signal Clk_in, Clk_c, the clock signal of voltage controlled oscillator output feed back to control after amplifying through driver
Signal processed occurs 1 as a clock input signal Clk_c, and clock input signal Clk_in is relative external timing signal, control
Signal generator processed obtains the current controling signal of correlation, voltage controlled oscillator is according to electric current control according to different clocks input signal
Signal processed produces the clock of N number of same frequency out of phase, wherein the phase difference of two neighboring clock is 360/N, n-th clock with
The phase difference of first clock is also 360/N, and driver increases driving force to the output clock signal of voltage controlled oscillator.
Control signal generator includes 1/2 frequency divider, 1/N frequency dividers, phase demodulation/frequency device, charge pump, low pass filter and electricity
Voltage-current converter, 1/2 frequency divider and 1/N output signal of frequency divider are sent to phase demodulation/frequency device, when 1/2 frequency divider receives outside
Clock signal Clk_in；1/N frequency dividers receive the clock signal Clk_c of pressure driver feedback；Phase demodulation/frequency device, charge pump and voltage
Current converter is sequentially connected, and low pass filter is connected between charge pump and voltage current adapter, and phase demodulation/frequency device produces phase
Position/frequency difference signal PU, PD, charge pump to low pass filter fill according to phase/frequency the difference signal PU, PD received/
Electric discharge lotus, produces voltage control signal, and the voltage control signal VFILT of input is converted to electric current control by the current converter of voltage one
Signal I_CTL1, I_CTL2 processed.
Voltage controlled oscillator includes frequency controller, and the ring being connected in turn by 5 delay unit input/output terminals
Shape oscillator, in the present embodiment, each delay unit in ring oscillator have one group of differential clocks input, while exporting warp
The differential clock signal of delay is crossed to next corresponding delay unit.
Current controling signal I_CTL1, I_CTL2 produced by frequency controller receiving voltage current converter, frequency control
The output signal of device processed exports adjacent clock as the control signal of each delay unit in ring oscillator by 5 delay units
Phase difference is passed after strengthening driving force through driver for 720 5 phase clock signals Clkl, Clk2, Clk3, Clk4, ClkS
Transport to serializer, serializer includes 5 fetch bit logic circuits a, b, c, d, e and combinator circuit, fetch bit logic circuit a, b,
C, d, e make corresponding fetch bit to each bit in parallel data signal, and export corresponding data-signal to combinator circuit,
Combinator circuit is received after the output signal of all fetch bit logic circuits, exports serial data signal.
In embodiments of the present invention, H.264 standard and SVAC standard agreements H.264/SVAC are stored in coding unit 104,
H.264/SVAC coding unit 104 is respectively according to H.264 standard and SVAC standards to serial video data signal and parallel video
Data-signal exports H.264 video flowing and SVAC video flowings after being encoded.
Specifically, H.264 encoder to the parallel data signal by being predicted, converting and quantization and and entropy volume
H.264 video flowing is exported after the resume modules such as code；
SVAC encoders by the serial data signal is predicted, converted with quantify and and entropy code processing after
Export SVAC video flowings.
Wherein, for H.264 encoder, H.264 encoder includes input module, image prediction module, prediction residual life
Into module, conversion module, entropy code module, inverse quantization and inverse transform block, image reconstruction module, classics DCT domain JND modules,
JND thresholdings modular converter, the adaptive adjusting module of prediction residual and output module, wherein：Input module respectively with image prediction
Module, prediction residual generation module are connected transmission image to be encoded with classical DCT domain JND modules, image prediction module with advance
Survey Residual Generation module to be connected the predicted value of transmission image to be encoded, the transmission that with conversion module is connected of prediction residual generation module is treated
The prediction residual of coded image, conversion module be connected with the adaptive adjusting module of prediction residual transmission H.264 convert after prediction
Residual transform coefficient, inverse quantization and inverse transform block be connected with image reconstruction module transmission rebuild after prediction residual, image weight
Modeling block is connected the image transmitted after reconstruction, classical DCT domain JND modules and JND thresholding modular converter phases with image prediction module
The vision for even transmitting classical DCT domain perceives distortion thresholding, JND thresholdings modular converter and the adaptive adjusting module phase of prediction residual
Even the vision of transmission H.264 transform domain perceives distortion thresholding, the adaptive adjusting module of prediction residual respectively with entropy code module
It is connected with inverse quantization with inverse transform block and is transferred through the prediction residual coefficient of adjustment, entropy code module is connected biography with output module
Code stream information after defeated entropy code.
Image prediction module, including：Infra-frame prediction submodule, estimation submodule and inter prediction submodule, wherein：
Infra-frame prediction submodule is connected with prediction residual generation module transmits the intra prediction value of image to be encoded, estimation submodule
Be connected transmission motion vector information with inter prediction submodule, and inter prediction submodule is connected transmission with prediction residual generation module
The inter prediction value of image to be encoded, estimation submodule is connected with input module transmits image to be encoded, infra-frame prediction
Submodule, estimation submodule and inter prediction submodule be connected respectively with image reconstruction module transmission rebuild after image.
Classical DCT domain JND modules include：Frequency characteristic submodule, light characteristic submodule, texture features submodule, when
Domain characteristic submodule and JND calculating sub modules, wherein：Frequency characteristic submodule, light characteristic submodule, texture features submodule
Be connected transmission image to be encoded with input module respectively with time domain specification submodule, and frequency characteristic submodule calculates son with JND
Module, which is connected, transmits the frequency sensitivity information of image, and light characteristic submodule is connected with JND calculating sub modules transmits image
Luminosity sensitivity information, texture features submodule is connected with JND calculating sub modules transmits the texture sensitive information of image, time domain
Characteristic submodule is connected with JND calculating sub modules transmits the time domain sensitive information of image, JND calculating sub modules and JND thresholdings
Modular converter, which is connected, transmits the discernable distortion thresholding of vision of classical DCT domain.
Prediction residual generation module produces the prediction residual of image to be encoded according to the predicted value of image to be encoded.
H.264, conversion module is converted to prediction residual.
Entropy code module carries out entropy code according to H.264 standard to the conversion coefficient after quantization.
Inverse quantization carries out inverse quantization and inverse transformation with inverse transform block to coefficient after the quantization of prediction residual, reconstructs prediction
Residual error.
Image reconstruction module reconstructs the image of coding according to the prediction residual after reconstruction.
The vision of classical DCT domain is perceived distortion thresholding and is transformed into H.264 transform domain by JND thresholdings modular converter.
Wherein, for SVAC encoders, SVAC encoders include input module, image prediction module, prediction residual generation
Module, conversion module, entropy code module, inverse quantization and inverse transform block, image reconstruction module, classics DCT domain JND modules, JND
The adaptive adjusting module of thresholding modular converter, prediction residual and output module, wherein：Input module respectively with image prediction mould
Block, prediction residual generation module are connected with classical DCT domain JND modules transmits image to be encoded, image prediction module and prediction
Residual Generation module, which is connected, transmits the predicted value of image to be encoded, and prediction residual generation module is connected to transmit with conversion module to be waited to compile
The prediction residual of code image, conversion module is connected with the adaptive adjusting module of prediction residual transmits the prediction residual after SVAC is converted
Conversion coefficient, inverse quantization and inverse transform block be connected with image reconstruction module transmission rebuild after prediction residual, image reconstruction mould
Block be connected with image prediction module transmission rebuild after image, classical DCT domain JND modules are connected biography with JND thresholding modular converters
The vision of defeated classical DCT domain perceives distortion thresholding, and JND thresholdings modular converter is connected biography with the adaptive adjusting module of prediction residual
The visions of defeated SVAC transform domains perceives distortion thresholding, the adaptive adjusting module of prediction residual respectively with entropy code module and inverse
Change is connected with inverse transform block is transferred through the prediction residual coefficient of adjustment, and entropy code module is connected with output module transmits entropy volume
Code stream information after code.
Image prediction module, including：Infra-frame prediction submodule, estimation submodule and inter prediction submodule, wherein：
Infra-frame prediction submodule is connected with prediction residual generation module transmits the intra prediction value of image to be encoded, estimation submodule
Be connected transmission motion vector information with inter prediction submodule, and inter prediction submodule is connected transmission with prediction residual generation module
The inter prediction value of image to be encoded, estimation submodule is connected with input module transmits image to be encoded, infra-frame prediction
Submodule, estimation submodule and inter prediction submodule be connected respectively with image reconstruction module transmission rebuild after image.
Classical DCT domain JND modules include：Frequency characteristic submodule, light characteristic submodule, texture features submodule, when
Domain characteristic submodule and JND calculating sub modules, wherein：Frequency characteristic submodule, light characteristic submodule, texture features submodule
Be connected transmission image to be encoded with input module respectively with time domain specification submodule, and frequency characteristic submodule calculates son with JND
Module, which is connected, transmits the frequency sensitivity information of image, and light characteristic submodule is connected with JND calculating sub modules transmits image
Luminosity sensitivity information, texture features submodule is connected with JND calculating sub modules transmits the texture sensitive information of image, time domain
Characteristic submodule is connected with JND calculating sub modules transmits the time domain sensitive information of image, JND calculating sub modules and JND thresholdings
Modular converter, which is connected, transmits the discernable distortion thresholding of vision of classical DCT domain.
Prediction residual generation module produces the prediction residual of image to be encoded according to the predicted value of image to be encoded.
Conversion module carries out SVAC conversion to prediction residual.
Entropy code module carries out entropy code according to SVAC standards to the conversion coefficient after quantization.
Inverse quantization carries out inverse quantization and inverse transformation with inverse transform block to coefficient after the quantization of prediction residual, reconstructs prediction
Residual error.
Image reconstruction module reconstructs the image of coding according to the prediction residual after reconstruction.
The vision of classical DCT domain is perceived distortion thresholding and is transformed into SVAC transform domains by JND thresholdings modular converter.
In embodiments of the present invention, the network transmitting unit 106 of first network transmission unit 105 and second can for 4G or
The wireless transport modules such as person WIFI.
Further, as shown in Fig. 2 dual coding web camera 10 also includes buffer cell 107；
Buffer cell 107 carries out exporting again after data buffering duplication to string and data hair to yuv format video data signal
Raw unit 103.
By setting buffer cell 107, relaxed the mismatch sent between equipment and receiving device, improve equipment it
Between concurrency.
Further, dual coding web camera 10 also includes control unit 108 and head 109；
Control unit 108 controls head 109 to move to obtain new video data according to video data.
Specifically, when control unit 108 detects the information for not having to include needs collection in video data, controlling head
109 rotate to reacquire video data, or, when control unit 108 detects video data including two vehicles, control the
One camera and second camera difference one vehicle of each collection, to obtain the video information of each vehicle.
The embodiment of the present invention realizes video data acquiring module and carries out SVAC by setting H.264/SVAC coding unit
Encode and H.264 encode, be not that simply 2 kinds of single video modules are assembled in the same apparatus, and export simultaneously
H.264 video flowing and SVAC video flowings, it is to avoid be in the same localities in the prior art and the security protection of 2 and more than 2 is installed set
Back-up does not carry out SVAC and the H.264 transmission of encoded data stream and causes the phenomenon of significant wastage.
The present invention provides a kind of coding method of dual coding web camera, as shown in figure 3, dual coding web camera bag
Include image acquisition units, AD conversion unit, string and data generating unit and H.264/SVAC coding unit；
Coding method includes：
Step S101. image acquisition units obtain video data.
Step S102. AD conversion units carry out video data to export yuv format video data signal after analog-to-digital conversion.
Simultaneously data generating unit will export serial video to step S103. strings after yuv format video data progress serioparallel exchange
Data-signal and parallel video data-signal.
Step S104.H.264/SVAC coding units are compiled to serial video data signal and parallel video data-signal
H.264 video flowing and SVAC video flowings are obtained after code, and H.264 video flowing and SVAC video flowings will be passed respectively by first network
Defeated unit and the second NE are transmitted.
Specifically, simultaneously data generating unit includes high-speed phase-locked loop, than bit pad and serializer to string；
Go here and there and data generating unit will yuv format video data carry out serioparallel exchange after output serial video data signal and
Parallel video data-signal, including：
The parallel data that processing produces lower-order digit is carried out with frequency doubling clock to the parallel data signal of input than bit pad
Signal；
Serializer receives the parallel data signal exported than bit pad, and the delay clock produced according to high-speed phase-locked loop
Signal produces serial data signal.
H.264/SVAC exported after coding unit is encoded to serial video data signal and parallel video data-signal
H.264 video flowing and SVAC video flowings, including：
H.264/SVAC obtained after coding unit is encoded to serial video data signal and parallel video data-signal
H.264 video flowing and SVAC video flowings, and will H.264 video flowing and SVAC video flowings respectively by first network transmission unit and
Second NE is transmitted；
Specifically, H.264 encoder to parallel data signal by being predicted, converting and quantify and and entropy code etc.
H.264 video flowing is exported after resume module；
SVAC encoders by serial data signal is predicted, converted with quantify and and entropy code processing after export
SVAC video flowings.
Dual coding web camera also includes buffer cell；
Coding method also includes：
Yuv format video data signal exported again after data buffering duplication to string buffer cell and list occurs for data
Member.
Further, dual coding web camera also includes control unit and head；
Control unit controls head motion to obtain new video data according to video data.
Elements/steps in terminal of the embodiment of the present invention can be combined, divided and deleted according to actual needs.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
Some equivalent substitutes or obvious modification are made on the premise of not departing from present inventive concept, and performance or purposes are identical, all should
It is considered as belonging to the scope of patent protection that the present invention is determined by the claims submitted.
Claims (10)
1. a kind of dual coding web camera, it is characterised in that the dual coding web camera includes image acquisition units, mould
Number converting unit, string and data generating unit, H.264/SVAC coding unit, first network transmission unit and the second network are passed
Defeated unit；
Described image collecting unit obtains video data；
The AD conversion unit carries out the video data to export yuv format video data signal after analog-to-digital conversion；
Simultaneously the yuv format video data is carried out output serial video data letter after serioparallel exchange to the string by data generating unit
Number and parallel video data-signal；
H.264/SVAC the coding unit is compiled to the serial video data signal and the parallel video data-signal
H.264 video flowing and SVAC video flowings are obtained after code, and H.264 video flowing and the SVAC video flowings pass through institute respectively by described in
State first network transmission unit and second NE is transmitted.
2. dual coding web camera as claimed in claim 1, it is characterised in that the dual coding web camera also includes
Buffer cell；
The buffer cell is exported to the string and number again after carrying out data buffering duplication to the yuv format video data signal
According to generating unit.
3. dual coding web camera as claimed in claim 1, it is characterised in that simultaneously data generating unit includes height to the string
Fast phaselocked loop, than bit pad and serializer；
It is described to carry out the parallel data that processing produces lower-order digit with frequency doubling clock to the parallel data signal of input than bit pad
Signal；
The serializer receives the parallel data signal exported than bit pad, and according to high-speed phase-locked loop generation
Delay clock signal produces serial data signal.
4. dual coding web camera as claimed in claim 1, it is characterised in that the H.264/SVAC coding unit includes
H.264 encoder and SVAC encoders；
H.264 the encoder by the parallel data signal is predicted, converted with quantify and entropy code processing after
Export H.264 video flowing；
The SVAC encoders by the serial data signal is predicted, converted with quantify and and entropy code processing after
Export SVAC video flowings.
5. dual coding web camera as claimed in claim 1, it is characterised in that the dual coding web camera also includes
Control unit and head；
Described control unit controls the head motion to obtain new video data according to video data.
6. a kind of coding method of dual coding web camera, it is characterised in that the dual coding web camera includes image
Collecting unit, AD conversion unit, string and data generating unit and H.264/SVAC coding unit；
The coding method includes：
Described image collecting unit obtains video data；
The AD conversion unit carries out the video data to export yuv format video data signal after analog-to-digital conversion；
Simultaneously the yuv format video data is carried out output serial video data letter after serioparallel exchange to the string by data generating unit
Number and parallel video data-signal；
H.264/SVAC the coding unit is compiled to the serial video data signal and the parallel video data-signal
H.264 video flowing and SVAC video flowings are exported after code.
7. coding method as claimed in claim 6, it is characterised in that it is single that the dual coding web camera also includes buffering
Member；
The coding method also includes：
The buffer cell is exported to the string and number again after carrying out data buffering duplication to the yuv format video data signal
According to generating unit.
8. coding method as claimed in claim 6, it is characterised in that simultaneously data generating unit includes lock phase at a high speed to the string
Ring, than bit pad and serializer；
Simultaneously the yuv format video data is carried out output serial video data letter after serioparallel exchange to the string by data generating unit
Number and parallel video data-signal, including：
It is described to carry out the parallel data that processing produces lower-order digit with frequency doubling clock to the parallel data signal of input than bit pad
Signal；
The serializer receives the parallel data signal exported than bit pad, and according to high-speed phase-locked loop generation
Delay clock signal produces serial data signal.
9. coding method as claimed in claim 6, it is characterised in that the H.264/SVAC coding unit is serially regarded to described
Frequency data-signal and the parallel video data-signal export H.264 video flowing and SVAC video flowings after being encoded, including：
H.264 the encoder to the parallel data signal by being predicted, converting and quantify and and the mould such as entropy code
H.264 video flowing is exported after block processing；
The SVAC encoders by the serial data signal is predicted, converted with quantify and and entropy code processing after
Export SVAC video flowings.
10. coding method as claimed in claim 6, it is characterised in that it is single that the dual coding web camera also includes control
Member and head；
The coding method also includes：
Described control unit controls the head motion to obtain new video data according to video data.
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