CN102983938A - No-feedback one-way data transmission method and device based on quick response (QR) codes - Google Patents
No-feedback one-way data transmission method and device based on quick response (QR) codes Download PDFInfo
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Abstract
The invention belongs to the information communication field, in particular to one-way data transmission technology among physical isolation networks. The one-way data transmission technology comprises a sending end with a quick response (QR) coding module and a QR display module, and a receiving end with a camera module and a QR decoding module. The one-way data transmission technology comprises the following steps that data to be transmitted are converted into QR image serial numbers and timestamps, the data after segmentation are combined according to an order and coded into QR code image sequences, the coded QR code image sequences are displayed by the QR display module of the sending end, and the receiving end decodes the QR code images after collecting images of the QR display module of the sending end, extracts timestamp information and image serial number information, and judges transmission correctness. If transmission is judged to be wrong, operation is stopped, or the decoded data are recombined and final results are output. The one-way data transmission technology sends the data by means of transmission of the QR code image sequences, no feedback signals exist between the sending end and the receiving end, and therefore one-way features of the data transmission are visual and reliable. Moreover, the technology solves the problem of how to ensure correctness of the data transmission on the condition of no feedbacks, ensures the reliable transmission of the data, and is suitable for practicality.
Description
Technical field
The present invention is a kind of no-feedback one-way data transmission method based on the QR code and device, belongs to the information communication field, particularly the internetwork one-way data transmission technology of physical isolation.
Background technology
In the process of Informatization Construction of Government Affairs, often can run into the situation that between intranet and extranet, to carry out exchanges data.As having produced new file at Intranet official document processing platform, need to lead so that note form notice is relevant, and according to security requirements, the Intranet system can not connecting Internet and mobile communication equipment.If use gateway etc. carries out exchanges data, cost compare is high; And generate the mode that intermediate file coils quarter again, affect again operating efficiency, and brought certain expending.In the urgent need to a kind of can be under the environment of inside and outside network physical isolation exchanges data solution with low cost.
Planar bar code technology is a kind of novel coding method that grew up in recent years, is widely used in the fields such as logistics, identification, exchanges data.It is according to certain rules in the chequered with black and white graphic recording data symbol information of plane distribution with certain specific set figure.Two-dimension code has many encryption algorithms, and commonly used have Data Matrix, PDF417, a QR Code etc.QR code (Quick Response Code) is the two-dimension code coding by the invention of Denso-Wave company, that this coding possesses is comprehensive, read at a high speed characteristic, and information memory capacity is large, better error-correcting performance, maximum can be stored the 2K byte data, the code word data that the highest error-correction level can error correction about 30%.
Summary of the invention
The present invention by with QR code technology as information carrier, a kind of no-feedback one-way data transmission method based on the QR code and device are disclosed.
Method of the present invention, its technical scheme comprise with the transmitting terminal of QR coding module and display module with the receiving terminal of photographing module and QR decoder module, the steps include:
(1) the maximum clock error N between initialization transmitting terminal and the receiving terminal system and every width of cloth QR code image repeat to show number of times M continuously;
(2) after the data that will transmit of the QR coding module of transmitting terminal are cut apart by convertible capacity, by QR image sequence number, timestamp and the data after cutting apart be combined in order and be encoded into QR code image sequence, wherein, synchrodata is comprised of image sequence number and timestamp, and each original partitioning portion repeats M time in sequence continuously;
(3) the QR code image sequence after will encoding is pressed the image sequence order and is shown by the QR display module of transmitting terminal;
(4) photographing module of receiving terminal gathers the image of transmitting terminal QR display module;
(5) decoder module in the receiving terminal is decoded to above-mentioned QR code image;
(6) timestamp information that extracts and image sequence information, judge transmission correctness:
If the time difference of receiving terminal surpasses N second or the image sequence difference surpasses threshold value M, then judge loading error occurring, stop operation; Otherwise, decoded data are recombinated, export last result.
In the present invention, M is the playback number of times of single frames QR image, in order to improve a kind of redundant measure of taking without the availability of system under the feedback condition.Particularly, every frame QR image has a unique image sequence number, as: 1,2,3,4,5 ... .N.When M=2, the data content that (1,2) and (3,4) two field picture transmits is on all four.When the system transmissions environment destroyed, continuous 2 missing images of the image sequence that receiving terminal receives, have 30% probability to lose transmission information this moment, and in case continuous 3 missing images are arranged, then there is 100% probability to lose information, causes the data can't normal transmission, judge bust this.
N is the poor of transmitting terminal and receiving terminal clock, judge by the numerical value to N, determine whether the present invention has carried out the continuous data transmission when operation: when not having transfer of data, system will keep stable connection status, in order to can change fast data transmission state over to.Therefore, simple passing through compared the timestamp information of transmitting terminal and the difference of receiving terminal clock, as long as can remain in the less scope, namely N just shows to be in synchronous regime.In addition, because the receiving terminal camera is controlled by equipment clock, regularly capture the QR image, the clock difference at system two ends should keep constant difference under normal circumstances.If the clock of any end is stable not, cause this clock difference to increase gradually, then illustrative system is in unsettled operational environment.
Among the present invention, carry out Data Segmentation by the maximum fault information of single frames QR code image, the value of maximum fault information determines that by the camera quality span is QR version 1 ~ 40.
For convenient, both synchronization time difference N generally are not more than 10 seconds, and when transmitting terminal showed code signal, its number of repetition M was generally 2-5 time.
In such scheme, when the data that are transmitted are carried out partition encoding, can cut apart according to different amount of information, but preferably cut apart by the maximum fault information of QR code permission, thereby improve data transmission bauds.
Realize the device of above-mentioned no-feedback one-way data transmission method based on the QR code, comprise with clock module transmitting terminal and receiving terminal, be connected with deblocking module, QR coding module and QR display module in the transmitting terminal in turn; Its receiving terminal comprises photographing module, QR decoder module, synchronous detection module and data recombination module.
Wherein, transmitting terminal (1) or receiving terminal (2) can adopt and be provided with mobile phone, PDA, computer or other the known device of realizing QR code sending and receiving and processing (coding, decoding).
The present invention by such scheme as can be known, the present invention is guaranteeing to have realized the one-way transmission of data under the prerequisite of network physical isolation, thereby has guaranteed the fail safe of transmission.In addition, the present invention is based on the mechanism for correcting errors that the QR code possesses self, can use the normal domestic use camera directly to gather the QR image that the LCD screen display is shown, overcome the intrinsic deformation of camera collection image, the problem such as fuzzy, can effectively realize data transfer.
It also has following advantages:
1, the present invention adopts common camera to shield as QR code display device as QR code collecting device, LCD, and hardware cost is lower.
2, the present invention carries out the data transmission by transmission QR code image sequence, and without feedback signal, the characteristic of unidirectional of transfer of data is directly perceived, reliable between transmitting terminal and the receiving terminal.
3, the data transmission method of the present invention's proposition has solved without under the feedback condition, how to guarantee the problem of the transmission of data correctness, thereby guarantees the transmitting of data, more is suitable for practicality.
Description of drawings
Fig. 1 is the schematic diagram that the present invention is based on the no-feedback one-way data transmission set of QR code;
Fig. 2 is the flow chart that the present invention is based on the no-feedback one-way data transmission method of QR code;
Embodiment
As shown in Figure 1, equipment of the present invention comprises transmitting terminal and receiving terminal, and they are PC, comprises interconnective deblocking module, QR coding module and QR display module in the transmitting terminal.Comprise interconnective photographing module, QR decoder module, synchronous detection module and data recombination module in the receiving terminal.The connected mode of each module adopts prior art in transmitting terminal and the receiving terminal.In transmitting terminal, its display module adopts existing lcd screen, and the photographing module in the receiving equipment adopts common camera.Transmitting terminal in the present embodiment and receiving terminal can adopt mobile phone, PDA, computer or other known device.
Utilize method that this equipment carries out data no-feedback one-way transmission as shown in Figure 2, concrete steps are as follows:
(1) the maximum synchronised clock error N in initialization transmitting terminal and the receiving terminal system and demonstration number of repetition M:
(a) synchronised clock.Under the synchronous working mode, the clock synchronous of transmitting terminal PC1 and receiving terminal PC2 need to be set, its error is no more than threshold value N second (N＜=10);
(b) QR code picture size.The information that embeds in the QR code is more, and the QR yardstick of formation is very little larger, and is just higher to the requirement of presentation device and picture pick-up device, therefore in the general situation of equipment performance, less information capacity and higher level of error correction often is set.The general span of maximum fault information is QR version 1 ~ 40;
(c) setting of playback number of times M.Repeat to send data and be without a kind of method that improves system availability under the feedback, but too high playback number of times causes the speed transmitted excessively slow.Experience shows, the playback number of times is set is 2 is the parameters of relatively compromising;
(d) stable operational environment.Camera collection QR code image needs stable operational environment, and the variation of any vibrations or light all will affect the quality that gathers image.Therefore camera effectively should be fixed, and good, uniformly illumination is provided.
Every part coding that will be split to form after (2) data that will transmit of the QR coding module of transmitting terminal are cut apart by convertible capacity, and the synchrodata that is formed by image sequence number and timestamp, the der group merging is encoded to the QR image sequence, and wherein each original partitioning portion repeats M time in sequence continuously.
(3) the QR code image sequence after will encoding is shown by order in the lcd screen of the QR display module transmitting terminal of transmitting terminal.
(4) the QR image of the camera collection of receiving terminal PC2 in the transmitting terminal lcd screen.
(5) decoder module in the receiving terminal is decoded one by one to above-mentioned QR code image.
(6) timestamp information and the image sequence information of synchronous mark in the every frame QR code image of extraction, then carry out misinterpretation:
Surpass N second or the image sequence difference surpasses threshold value M such as equipment time difference of timestamp information and the receiving terminal of decoding, then judge bust this, system sends the timing error alarm, and this transmission ending transmits after adjusting equipment or parameter by the monitor staff again.
All in the specified value scope, then the data recombination module of receiving terminal is recombinated decoded data such as the time difference, image sequence difference, and the data that reduction obtains transmitting are finished data transmission procedure one time.
Claims (5)
1. no-feedback one-way data transmission method based on the QR code is characterized in that: it comprises with the transmitting terminal of QR coding module and display module with the receiving terminal of photographing module and QR decoder module, the steps include:
(1) the maximum clock error N between initialization transmitting terminal and the receiving terminal system and every width of cloth QR code image repeat to show number of times M continuously;
(2) after the data that will transmit of the QR coding module of transmitting terminal are cut apart by convertible capacity, by QR image sequence number, timestamp and the data after cutting apart be combined in order and be encoded into QR code image sequence, wherein, synchrodata is comprised of image sequence number and timestamp, and each original partitioning portion repeats M time in sequence continuously;
(3) the QR code image sequence after will encoding is pressed the image sequence order and is shown by the QR display module of transmitting terminal;
(4) photographing module of receiving terminal gathers the image of transmitting terminal QR display module;
(5) decoder module in the receiving terminal is decoded to above-mentioned QR code image;
(6) timestamp information that extracts and image sequence information, judge transmission correctness:
If the time difference of receiving terminal surpasses N second or the image sequence difference surpasses threshold value M, then judge loading error occurring, stop operation; Otherwise, decoded data are recombinated, export last result.
2. the no-feedback one-way data transmission method based on the QR code according to claim 1, it is characterized in that: the maximum fault information by single frames QR code image carries out Data Segmentation, and the value span of maximum fault information is QR version 1 ~ 40.
3. the no-feedback one-way data transmission method based on the QR code according to claim 1, it is characterized in that: synchronization time difference N is generally less than and equals 10 seconds; When transmitting terminal showed code signal, its number of repetition M was 2-5 time.
4. no-feedback one-way data transmission device based on the QR code, it is characterized in that: it comprises with the transmitting terminal of clock module and receiving terminal, is connected with deblocking module, QR coding module and QR display module in the transmitting terminal in turn; Its receiving terminal comprises photographing module, QR decoder module, synchronous detection module and data recombination module.
5. the no-feedback one-way data transmission device based on the QR code according to claim 4, it is characterized in that: described transmitting terminal (1) or receiving terminal (2) are mobile phone or PDA or computer.
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| CN103259781A (en) * | 2013-04-07 | 2013-08-21 | 内蒙古华腾科技发展有限公司 | Data transmission system based on image recognition |
| CN103346960A (en) * | 2013-06-18 | 2013-10-09 | 万达信息股份有限公司 | Recognizable figure-based data transmission method across networks |
| CN103401771A (en) * | 2013-07-26 | 2013-11-20 | 四川华迪航天金穗高技术有限公司 | Network isolation method and network isolation system |
| CN103684997A (en) * | 2013-12-31 | 2014-03-26 | 厦门市美亚柏科信息股份有限公司 | One-way instantaneous transmission method of complete physical isolation data and system for achieving same |
| CN104301306A (en) * | 2014-09-22 | 2015-01-21 | 江苏飞搏软件技术有限公司 | System used for calling intranet services safely through Internet |
| CN105075281A (en) * | 2013-06-05 | 2015-11-18 | 松下电器（美国）知识产权公司 | Data decoding method, data decoding apparatus, and data transmitting method |
| US20160085975A1 (en) * | 2014-09-18 | 2016-03-24 | Safenet, Inc. | Constrained Information Transfer |
| CN105518745A (en) * | 2013-06-24 | 2016-04-20 | 施耐德东芝换流器欧洲公司 | Method and system for displaying at least one matrix code on a screen to send data to electronic equipment provided with means for reading the matrix code(s) |
| CN106101662A (en) * | 2016-08-18 | 2016-11-09 | 青岛晟铭网络科技有限公司 | A kind of system and method utilizing bar code transmission data |
| CN106657083A (en) * | 2016-12-28 | 2017-05-10 | 贵州大学 | Secure data transmission method based on machine vision |
| CN107517330A (en) * | 2017-09-26 | 2017-12-26 | 南京哈卢信息科技有限公司 | A kind of method and system of desktop portable type one-way safety transmission |
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| CN109086851A (en) * | 2018-08-28 | 2018-12-25 | 梁庆生 | Dynamic two-dimension code |
| CN109088927A (en) * | 2018-08-02 | 2018-12-25 | 合肥联宝信息技术有限公司 | A kind of method and electronic equipment of transmission and reception data |
| CN110097159A (en) * | 2019-04-29 | 2019-08-06 | 绍兴聚量数据技术有限公司 | A kind of QR code safety certifying method and system based on Hamming code |
| CN113194081A (en) * | 2021-04-25 | 2021-07-30 | 武汉烽火信息集成技术有限公司 | One-way message transmission system and method suitable for physical isolation environment |
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| CN105518745B (en) * | 2013-06-24 | 2018-04-03 | 施耐德东芝换流器欧洲公司 | For at least one square matrix code is shown on screen with transmit data to be furnished be used for read square matrix code part electronic equipment method and system |
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| CN106657083A (en) * | 2016-12-28 | 2017-05-10 | 贵州大学 | Secure data transmission method based on machine vision |
| CN107517330A (en) * | 2017-09-26 | 2017-12-26 | 南京哈卢信息科技有限公司 | A kind of method and system of desktop portable type one-way safety transmission |
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| CN114142985A (en) * | 2021-11-17 | 2022-03-04 | 中国船舶重工集团公司第七一九研究所 | Optical system and method for realizing time synchronization of physical isolation information system |
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Application publication date: 20130320 |