CN104284207B - Information transmission method based on video image - Google Patents
Information transmission method based on video image Download PDFInfo
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- CN104284207B CN104284207B CN201410582828.2A CN201410582828A CN104284207B CN 104284207 B CN104284207 B CN 104284207B CN 201410582828 A CN201410582828 A CN 201410582828A CN 104284207 B CN104284207 B CN 104284207B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/435—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
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Abstract
The invention relates to an information transmission method based on a video image. The method comprises the steps that data information is encoded at a signal sending end; then a code stream obtained after encoding is modulated into the image, and video information is generated; the video information which is generated at the signal sending end is acquired by a camera arranged on equipment through a video transmission channel at a receiving end, then a received video is demodulated, and the code stream information in the image is acquired; at last, the demodulated code stream is decoded, and the transmitted data can be restored and obtained. Data transmission can be conducted only by the camera arranged on a mobile terminal, the high resolution ratio and high imaging quality are achieved, the cost is low, environmental disturbance is small, and therefore the problem that data can not be transmitted when a network and a wireless network are cut off, and a USB flash disk is not connected is solved. Accordingly, the information transmission method based on the video image can be widely applied to the data transmission field.
Description
Technical field
The present invention relates to a kind of information transferring method, especially with regard to a kind of information transferring method based on video image.
Background technology
With the development of the communication technology, the movement with mobile phone, panel computer, notebook computer, MP3 player etc. as representative
Terminal is widely applied.For the ease of the mutual transmission of information between mobile terminal, various different numbers are developed
According to transmission means.Message-switching technique between current mobile terminal mainly has bluetooth, infrared, wifi etc., and these technologies are being entered
Before row information transmission, it is necessary to which by links such as authenticating user identification, receptions, and wifi is in no network or without nothing
The transmission of data cannot be carried out in the state of line.
Existing transmission technology is as follows：
1) Ma Ming, Li Haibo are based on the generation of the Quick Response Code of Android with the design of identifying system and realization
.Computer Knowledge and Technology.Vol.8, No.26.September 2012. system passes through
Android phone is parsed and encoded to two-dimensional code data, realizes the function of Quick Response Code generation and identification.The system is mainly wrapped
Include two parts：(1) the generation system design of two-dimensional bar code.The generation of Quick Response Code mainly uses corresponding coding bag, by user
The character of input is converted into two-dimensional array, then according to the coding criterion of Quick Response Code, Quick Response Code is drawn using drawing function.
(2) the identifying system design of two-dimensional bar code.System gathers the image information of two-dimensional bar code by camera first, then passes through
Interface function technology obtains the view data in camera.The major defect of the technology is：(1) every two dimensional image is all black and white
Image, and it represents an information for bit with multiple pixels, therefore its information storage is very small, it is therefore desirable to it is very many
Image store code stream information, with the relatively low rate of information throughput.(2) function of directly being transmitted without information.
2) Zhao Lixin, Chen Hongzhou, monarch Ge Ying send information code and obtain the method and dress of information code with audio signal
Put.Publication number：In the patent of 102522090A, it is proposed that a kind of method that message code is sent with audio signal.The present invention is first
Information code and synchronous head are modulated in the audio signal of second band；The audio signal of the second band of the modulation is direct
Transmission, or be transmitted after the audio signal of the second band of the modulation is superimposed with the audio signal of first band.Connecing
The audio signal that receiving end will be received is demodulated, and obtains transmitting data.
In sum, the shortcoming in the existing information technology solution with audio as carrier is mainly (1) and is easily subject to environment
The interference of noise or other sound.(2) transmission rate is relatively low.
The content of the invention
Regarding to the issue above, it is an object of the invention to provide a kind of camera that need to be carried using mobile terminal device,
By image encoding and decoding technique, the information transferring method based on video image of information transfer just can be carried out.
To achieve the above object, the present invention takes following technical scheme：A kind of information transferring method based on video image,
It is comprised the following steps：1) operation at Video coding end is as follows：1. the code stream of data to be transmitted is split, and will be to be passed
Transmission of data is packed；2. the data to be transmitted packed is encoded by source encoder, the code stream after generation is encoded；
3. by the code stream modulation after coding to picture, encoded video streams are produced；4. encoded video of the video player to generation is passed through
Stream is played out；2) it is as follows in the operation of video decoding end：1. use video receiver to obtain video with least 3 times of speed to broadcast
Put the video information that device is played out；2. it is demodulated for the video information for receiving, obtains contained binary code stream in video
Information；3. binary code stream information contained in video is decoded, reduces the information of data to be transmitted.
The step 1) the step of 1. comprise the following steps：A, the essential information for reading data to be transmitted, obtain the data
Size be s；When being transmitted in the middle of B, calculating data to be transmitted modulation to picture, and set per the storage of pictures most multipotency
Information contentWherein, W represents the width of storage information, and H represents the height of storage information；N × n is represented and chosen
For representing the size of the block of pixels of color；The gross information content to be transmitted after C, calculation code：If coding information transfer rate is e,
The information size to be transmitted is B=s/e after then encoding；D, calculate data to be transmitted needed for picture sum N and last
Picture information contained amount l：If B00A==0, then it is N=B/A to transmit the total number of picture, and last picture storage letter
The size of breath is l=A；Otherwise N=B/A+1, l=B- (N-1) * A；E, data to be transmitted is carried out by A of every pictures size
Packing.
The step 1) the step of 2. in pack data to be transmitted carry out LDPC message sink codings.
The step 1) the step of 3. in, comprise the following steps：A, by the picture sum N needed for data to be transmitted and last
The information content l of one pictures, is stored in the N synchronous picture for transmitting；B, in synchronous picture add training information；C, general
The code stream for encoding generation is stored in synchronous picture；D, the picture of coding is stored in video with fixed rate, the fixed rate is by treating
The data volume of transmission and the resolution ratio decision for transmitting the picture of data.
Due to taking above technical scheme, it has advantages below to the present invention：1st, the invention provides a kind of new information
Transmission means, by transmitting a variety of data with video as carrier, the camera that need to be only carried using mobile terminal is just
The transmission of data can be carried out, with resolution ratio and image quality very high and with low cost, environmental disturbances are small, solved with this
Suspension, it is disconnected wireless, do not connect USB flash disk and cannot transmit the problem of data.Image used is colour picture when the 2nd, being encoded in the present invention,
Compared to the bianry image used by Quick Response Code, information storage of the invention is big, and it is the total number of required picture that can reduce transmission,
It is effectively improved the efficiency of transmission of data.3rd, in signal demodulating end, the present invention is believed using each colouring information in total color
The size of proportion represents probability that this information is 1 in breath, by this information input to source coding, this soft input/soft
The decoding arbitration schemes of output can improve the decoding performance of decoder, and the error rate of data transfer can be greatly lowered.Therefore,
Present invention can be widely used to field of data transmission.
Brief description of the drawings
Fig. 1 is schematic flow sheet of the present invention
Fig. 2 is Video coding theory diagram
Fig. 3 is encoded picture format pattern diagram
Fig. 4 is video pre-filtering flow chart
Fig. 5 is the space reflection schematic diagram at control point
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
The principle of the invention is as follows：Data message is encoded in signal sending end first；Then by the code stream after coding
Modulate in image, produce video information；By transmission of video passage, hair is obtained using the camera that equipment is carried in receiving terminal
The video information that sending end is produced, is then demodulated to the video for receiving, and obtains the code stream information in image；Finally to demodulation
Code stream enter row decoding, just reducible data transmitted.
As shown in figure 1, a kind of information transferring method based on video image, it is comprised the following steps：
1) it is as follows in the operation of Video coding end (information transmitting terminal)：
As shown in Fig. 2 1. being split the code stream of data to be transmitted, and data to be transmitted is packed, it includes
Following steps：
A, the type of coding for reading data to be transmitted, data are first-class well known to a person skilled in the art essential information, obtain
The size of the data is s (bit)；
When being transmitted in the middle of B, calculating data to be transmitted modulation to picture, per the information content of pictures most multipotency storageWherein, n × n represents the size for choosing the block of pixels for being used for representing color, it is stipulated that letter is stored per pictures
The picture size of breath is W × H (i.e. resolution ratio is W × H), and wherein W represents the width of storage information, and H represents the height of storage information
Degree；
Picture can use two kinds of black white image and gray level image, black white image using two gray level images of gray level come
Storage code stream information, gray level image stores code stream information using its different grey-scale.
In the present embodiment, illustrated using black white image：For a width picture, its resolution ratio is W × H, using wherein
Small pixel block represent a kind of color, represent bit information using different colours, i.e., with color come the bit stream of transmission information, W
=640, H=768, and use 4 × 4 16 pixels to represent a kind of color, ratio is represented with red, green, blue, Bai Si kinds color
Special information, each color represents 2 bits.11 wherein are represented with red, green represents 10, and blueness represents 01, and white represents 00,
Therefore per the information content of pictures most multipotency storageMore colors can certainly be used
Storage code stream information, does not increase the information storage of every pictures to remember, and improves the efficiency of transmission of information.
The gross information content to be transmitted after C, calculation code：If coding information transfer rate is e, the letter to be transmitted after coding
Breath size is B=s/e (bit)；
Picture sum N and last picture information contained amount l needed for D, calculating data to be transmitted：If B00A==0
(remainder is 0), then it is N=B/A to transmit the total number of picture, and the size of the storage information of last picture is l=A；It is no
Then N=B/A+1, l=B- (N-1) * A, and by the picture sum N needed for data to be transmitted and last picture information contained amount
3. l is sent to step；
E, data to be transmitted is packed by A of every pictures size, that is, corresponded to all data flows of every pictures
Correspondence is packaged into each self-corresponding packet；
2. LDPC (Low Density Parity Check are carried out to the data to be transmitted packed by source encoder
Code, low density parity check code) message sink coding, the code stream after generation is encoded, it is comprised the following steps：
A, take k bit information code every time for the data to be transmitted after packing and encoded, because code rate is e, compile
Code generation bit number n=k/e.In the present embodiment, k=960, code rate e=16/18, therefore n=k/e=1080.
B, the following double diagonal arrangements of construction matrix as LDPC code check matrix：
Wherein, p1Represent a matrix of (n-k) × k, p2Represent a matrix of (n-k) × (n-k), h (1)=h (n-
K)=1, for 1 ＜ i ＜ n-k, it is 1 to have an element value in { h (i) }.
C, set u=(u1, u2..., uk) it is information group, v=(v1, v2..., vn) it is the code word obtained after being encoded through LDPC,
According to vHT=0, then have
Can be obtained from formula (2)
D, according to formula (2) and (3), can be obtained successively with forward-backward recutrnce computing：
Specific recursive operation process description is as follows：
I, forward recursive：ForviRecursive operation expression formula is：
II, backward recursive：ForviRecursive operation expression formula is：
E, more than several steps by k bit information code, coding generates n code word, is stored in coded data.Repeat
Step A)~E), until the LDPC codings of all of package information stream are fully completed.
It should be noted that the present invention is in addition to LDPC message sink codings, any volume with error correction can also be used
Code mode and its improved method.
3. by the code stream modulation after coding to picture, encoded video streams are produced, it is comprised the following steps：
A, by the picture sum N and the information content l of last picture needed for data to be transmitted, be stored in synchronous picture,
Synchronous picture is the N pictures for transmitting；
In the present embodiment, 2 information of bit are taken every time, if 11 4 × 4 16 pixel values are all set to it is red
Color；If 4 × 4 16 pixel values are all set to green by 10；If 01 is all set to 4 × 4 16 pixel values
It is blue；If 4 × 4 16 pixel values are all set to white by 00.
B, have misalignment in the transmission due to image, therefore using the method for given threshold：Setting lower threshold and
Upper limit threshold, 0 is judged to less than lower threshold, and 1 is judged to more than upper limit threshold, and the training information (threshold of setting is added in synchronous picture
Value) come aid in video decoding end calculate bit be 1 probability, improve signal demodulate output information accuracy rate, so as to improve
The reliability of data transfer；
In the present embodiment, the information of N and l is stored in synchronous picture using 1~4 row.The present embodiment with ensuing 5~
8 rows are all set to red, and 9~12 rows are all set to green, and 13~16 rows are all set to blueness, and training during as decoding is believed
Breath.Other places of synchronous picture are all set to white.
C, will encode generation code stream be stored in synchronous picture；
As shown in figure 3, to enable to be relatively easy to acquisition area-of-interest during decoding, white is added in the surrounding of picture
Frame, will all be set to white by the pixel value of t (t values are 4 in the present invention) bit around picture.Deposited in image information simultaneously
Storage top adds 4 row additional spaces to store the number information of every pictures, its general layout as shown in figure 3, wherein code pattern
The size of piece should be (W+t*2) × (H+t*2+4).The coded information stream obtained by source encoder is stored in picture, information successively
Storage rule reference step A, while picture number information 1 is to N, and (be stored into coded information stream at first is picture 1, by that analogy
To picture N) position of number information that is added to successively shown in Fig. 4, so as to the picture for being encoded.
D, by encode picture video is stored in the speed of 10fps (Frames Per Second, transmission frame number per second),
The speed is determined by data volume waiting for transmission and for transmitting the resolution ratio of the picture of data.
4. the encoded video streams for producing are played out with the speed of 10fps to video by video player.
2) it is as follows in the operation of video decoding end (information receiving end)：
1. use camera that the video information of the 10fps that video player is played out is obtained with the speed of 30fps.Due to connecing
The video rate of receiving end is play end three times, therefore, a pictures at end are played, receiving terminal can obtain three.
2. as shown in figure 4, being demodulated for the video information for receiving, contained binary code stream letter in video is obtained
Breath, its step is as follows：
A, image denoising (image preprocessing)；
The coloured image of acquisition is converted directly into gray level image, simple fixed threshold binaryzation is carried out, by what is obtained
The pixel value of gray scale picture all becomes 255 more than 180, is otherwise 0.So far, Video coding end white frame wheel can just be obtained
Wide clearly bianry image.
B, image Corner Detection；
I, bianry image contours extract：Classical edge extracting method is Edge Detection Local Operator method, and the present invention is profit
Rim detection is carried out with the single order of grey scale change in each pixel neighborhoods or the Changing Pattern of the second order number of plies.Used in the present invention
Laplace operator carries out rim detection to bianry image, preferably obtains profile information.Laplace filter is by binary
The second-order differential of function, if binary function graphical representation is f (x, y), then its Laplace transform is defined as：
For digital picture, its discrete form can be obtained.Laplce's discrete form is relatively more, the present invention just wherein
The form of kind is introduced, and its expression formula is：
So as to obtain the contour curve of area-of-interest.
II, image Corner Detection：Four summits of the white frame coded by coded image need to be only obtained, therefore by meter
The angle for calculating angle point both sides contour curve discrete point just can obtain the angular coordinate of contour curve.
C, image rectification；
Information transmission scheme based on video is the scheme that information in another mobile phone is obtained with cell-phone camera, is clapped in video
Take the photograph the stage, inevitably have the inclined problem of image.The present invention mainly uses control point transform method to carry out image calibration
Just, the space reflection figure (as shown in Figure 5) of point transformation is controlled：Quadrangle summit is mapped directly on corresponding volume rectangle summit, and
Point inside input quadrangle is then mapped on the point of correspondence rectangle inside.
I, bilinear space conversion expression formula are：
To the input picture and output image that give, defined transform can be write as matrix form：
Therefore the point of 4 points and its corresponding transformation space is given, so that it may 8 linear equations are obtained, as long as institute therein
Any three points having are not point-blank, it is possible to solve 8 transformation parameters.So as to obtain input picture and output figure
The relation of picture.
In above-described embodiment, image rectification is carried out using point transform method is controlled, can also be using perspective transform method and non-
Image rectification method under calibration point.
II, by gray-level interpolation, make correction chart picture keep continuity and connectedness.For bianry image, bilinearity is used
The method of interpolation obtains correction chart picture.
The computing of bilinear interpolation can be expressed as：
Gray value more i.e. wants four adjacent pixel values of right space change point to determine.
III, corrected after image after, image size is adjusted to the size of coded image.
D, the code stream information for obtaining area-of-interest；
Judge whether photo current is synchronous picture (synchronous picture is the code stream information of area-of-interest), if current figure
1~4 row has information in piece, and 5~8 rows are all red, and 9~12 rows are all green, and 13~16 rows are all blue, other places of picture
All for white, then photo current is synchronous picture；Otherwise continue to read in next pictures, repeat step D is same until finding
Step picture.
E, the information obtained in synchronous picture：By calculating the ratio of each color component, obtain each bit be 1 it is general
Rate information, the input code flow information that this probabilistic information is decoded as LDPC, so improves decoding by being input into Soft Inform ation
Performance, further improves the reliability of data transfer.
The information N and l of 1~4 row in picture are obtained first.Color has after being shot by mobile phone camera due to picture
Distortion, calculates the color component ratio of the training information in synchronous picture, as the reference of decoded portion below, concrete scheme
It is：Red three color component values sumRr, sumRg, sumRb by being obtained after video channel, the three of green are counted respectively
Three color component values sumBr, sumBg, sumBb of individual color component value sumGr, sumGg, sumGb and blueness.
Corresponding with coding side, the present embodiment represents 01, white representative with red 11, the green 10, indigo plant that represents that represents during coding
00, therefore can be red and green during first bit 1, second bit can be red and blue when being 1, count respectively
Calculate the probability that first bit in red is 1Second bit is 1 probabilityFirst bit is 1 probability in green
Second bit is 1 probabilityFirst bit is 1 probability in greenSecond bit is 1 probability
F, obtain synchronous pictorial information after, read the picture behind video, until obtaining the picture that three numberings are 1, by
In shooting process, each numbering shoots that 3 pictures are stand-by, therefore to find the picture that three numberings are 1.Due to first and
3rd pictures can be because the influence of image conversion has ghost image, therefore middle second pictures of selection as decoding picture.
G, the RGB component information for reading from image each pixel, from coding when form known to, during coding with 4 ×
4 16 pixels represent 2 bits, and red 11, the green 10, indigo plant that represents that represents represents 01, represents 00 in vain.Therefore, by statistics 4 ×
4 16 color components of pixel, respectively obtain total amount sumR, sumG, the value of sumB of RGB information in pixel.Lead to first
The value for judging sumR, sumG, sumB is crossed, if three ratios of value are all 1 or so, judges that this 16 pixels are white, therefore two
Individual bit is 1 probability all almost 0, and 00 is stored in decoding file.Otherwise calculate Value, the principal component in three kinds of components of RGB is then calculated respectively, if principal component is for red
The value of color, i.e. sumR is maximum, and is worth, the then value that calculates more much larger than sumG, sumB, then by formula (11) and (12) respectively
Calculate the probability that two bits are 1：
If principal component is green, the probability that two bits are 1 is calculated by formula (13) and (14) respectively：
If principal component is blueness, the probability that two bits are 1 is calculated by formula (15) and (16) respectively：
Counted probability is stored in decoding file.Return to step F), it is 2 pictures for arriving N to obtain numbering successively, obtains figure
Information in piece.The decoding file Soft Inform ation that will be obtained, is input to source decoder.
3. binary code stream information contained in video is decoded, reduces the information of data to be transmitted, its step is such as
Under：
A, BP decoding algorithm are the decoding algorithms set up based on symbol Maximize criterion one by one.
From step 2) 2. in the code stream that obtains, n numbers are taken every time and enter row decoding y=(y1,y2,…,yn)。
B, the posterior probability that each bit is 1 is calculated first.Using the reliability based on log-likelihood ratio in the present invention
To measure, i.e.,：
Obtain the LLR ratio that each bit is 1.
C, meet h to allij=1 i and j, makes Lj→i=Lj。
D, check-node update
To each check-node, its output external information is calculated according to formula (18),
E, variable node update
To each variable node, its output external information is calculated according to formula (19)
F, decoding judgement
Calculate the total message of variable node：Each variable node is calculated
Hard decision：
If G, obtainingMeetOr reach maximum iteration, then stop decoding；Otherwise, step is returned
Rapid D) continue iteration.
H, the n Soft Inform ation by that will be input into, decoding k variable node information of generation, output text is stored in by decoding result
In part.Repeat step A)~H), until all of information decoding is completed, restoring data so far completes to be passed with video as carrier
A variety of data are passed, the camera that need to be only carried using equipment just can carry out the transmission of data, solve suspension, disconnected nothing
Line, USB flash disk is not connect cannot transmit the problem of data.
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each part, connected mode and manufacture craft etc. are all
Can be what is be varied from, every equivalents carried out on the basis of technical solution of the present invention and improvement should not be excluded
Outside protection scope of the present invention.
Claims (5)
1. a kind of information transferring method based on video image, it is comprised the following steps：
1) operation at Video coding end is as follows：
1. the code stream of data to be transmitted is split, and data to be transmitted is packed；
2. the data to be transmitted packed is encoded by source encoder, the code stream after generation is encoded；
3. by the code stream modulation after coding to picture, encoded video streams are produced；
4. the encoded video streams for producing are played out by video player；
2) it is as follows in the operation of video decoding end：
1. camera is used to obtain the video information that video player is played out with least 3 times of speed；
2. it is demodulated for the video information for receiving, obtains contained binary code stream information in video；
3. binary code stream information contained in video is decoded, reduces the information of data to be transmitted.
2. a kind of information transferring method based on video image as claimed in claim 1, it is characterised in that：The step 1)
1. step comprises the following steps：
A, the essential information for reading data to be transmitted, the size for obtaining the data are s；
When being transmitted in the middle of B, calculating data to be transmitted modulation to picture, and set the information content per the storage of pictures most multipotencyWherein, W represents the width of storage information, and H represents the height of storage information；N × n is represented to choose and is used for generation
The size of the block of pixels of table color；
The gross information content to be transmitted after C, calculation code：If coding information transfer rate is e, the information to be transmitted is big after coding
Small is B=s/e；
Picture sum N and last picture information contained amount l needed for D, calculating data to be transmitted：If B00A==0, then pass
The total number of defeated picture is N=B/A, and the size of the storage information of last picture is l=A；Otherwise N=B/A+1, l=
B-(N-1)*A；
E, data to be transmitted is packed by A of every pictures size.
3. a kind of information transferring method based on video image as claimed in claim 1, it is characterised in that：The step 1)
Step 2. in pack data to be transmitted carry out LDPC message sink codings.
4. a kind of information transferring method based on video image as claimed in claim 2, it is characterised in that：The step 1)
Step 2. in pack data to be transmitted carry out LDPC message sink codings.
5. a kind of information transferring method based on video image as described in claim 2 or 4, it is characterised in that：The step
1) the step of 3. in, comprise the following steps：
A, by the picture sum N and the information content l of last picture needed for data to be transmitted, be stored in same for transmit N
In step picture；
B, in synchronous picture add training information；
C, will encode generation code stream be stored in synchronous picture；
D, the picture of coding is stored in video with fixed rate, the fixed rate is by data volume waiting for transmission and for transmitting data
Picture resolution ratio determine.
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| CN1620141A (en) * | 2000-02-17 | 2005-05-25 | 传感电子公司 | Surveillance apparatus for camera surveillance system |
| CN101247183A (en) * | 2007-02-15 | 2008-08-20 | 凌阳科技股份有限公司 | Transmission device, receiving device, system and method for implementing communication based on ultrasonic wave |
| CN102522090A (en) * | 2011-12-13 | 2012-06-27 | 我查查信息技术(上海)有限公司 | Method and device for sending information code and acquiring information code by audio frequency signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1620141A (en) * | 2000-02-17 | 2005-05-25 | 传感电子公司 | Surveillance apparatus for camera surveillance system |
| CN101247183A (en) * | 2007-02-15 | 2008-08-20 | 凌阳科技股份有限公司 | Transmission device, receiving device, system and method for implementing communication based on ultrasonic wave |
| CN102522090A (en) * | 2011-12-13 | 2012-06-27 | 我查查信息技术(上海)有限公司 | Method and device for sending information code and acquiring information code by audio frequency signal |
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