CN113239712A - Two-dimensional code high-speed decoding method and system - Google Patents
Two-dimensional code high-speed decoding method and system Download PDFInfo
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- CN113239712A CN113239712A CN202110462236.7A CN202110462236A CN113239712A CN 113239712 A CN113239712 A CN 113239712A CN 202110462236 A CN202110462236 A CN 202110462236A CN 113239712 A CN113239712 A CN 113239712A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/1408—Methods for optical code recognition the method being specifically adapted for the type of code
- G06K7/1417—2D bar codes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/1439—Methods for optical code recognition including a method step for retrieval of the optical code
- G06K7/1443—Methods for optical code recognition including a method step for retrieval of the optical code locating of the code in an image
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N20/00—Machine learning
- G06N20/20—Ensemble learning
Abstract
The invention discloses a high-speed decoding method and a system for a two-dimensional code, which comprises a two-dimensional code display screen at a coding end, a high-speed camera, a USB3.0 data connectivity, a decoding server, an equipment external support, an Ethernet line and a target network, wherein the high-speed camera is aligned to the two-dimensional code display screen at the coding end, the decoding end is connected with the target network of the target network by using an Ethernet line 7, the decoding server is used for carrying out the operation required by positioning and decoding the two-dimensional code, the equipment external support is used for providing physical support for each component, the invention uses the high-speed camera to shoot a high-speed changing color two-dimensional code, provides backward support for a black and white two-dimensional code, uses an SVM (support vector machine) artificial intelligence technology, can receive, position and analyze the two-dimensional code at the speed of more than 120 frames per second, removes error data and transmits the two-dimensional code to the target network, and a stable and qualified strict physical partition is provided for users with strict requirements on network safety.
Description
Technical Field
The invention relates to a two-dimensional code high-speed decoding system, in particular to a method for quickly decoding a color two-dimensional code with a fixed position by using a high-speed camera and an artificial intelligence technology.
Background
At present, the two-dimension code is quite widely applied in various industries, and the invention is particularly relevant to the requirement of using the two-dimension code to conduct information one-way import in the field of network information security. The network system, especially the important system related to the national civilization, is subject to intrusion and attack, which not only causes huge economic loss, but also seriously even endangers the security of the country and the stability of the society. In the security requirement of network systems, security problems often occur when networks with different security levels are connected. Generally, it is required that high-security data in a high-security network cannot flow to a low-security network, but low-security data can flow to the high-security network (data confidentiality requirement), which puts a requirement on unidirectional flow of data.
The idea of ensuring data unidirectional flow is that a network data packet encoder and a screen are arranged at a low-security network end, and a camera and a network data packet decoder are arranged at a high-security network end. Therefore, as the network packet information can be encoded into the two-dimensional code to be displayed on the screen and captured by the camera, the low-security data can flow to the high-security network; since the camera is unlikely to propagate any information to the screen, high-security data in the high-security network cannot flow to the low-security network. This is called a unidirectional gatekeeper system. Obviously, the higher the refresh speed of the two-dimensional code display, the higher the bandwidth of the unidirectional gatekeeper system, and therefore, the improvement of the refresh rate of the two-dimensional code is a target of product improvement. The high speed refreshing means that high speed decoding is needed, otherwise, data packet loss will occur, and the high speed decoding has higher technical difficulty. Meanwhile, the number of information in one two-dimensional code can be increased by using a color two-dimensional code instead of the traditional black and white two-dimensional code, so that the system bandwidth is increased, and certain requirements are generated on decoding equipment.
This introduces the technical background of the invention: the speed of one-way data flow depends on the refresh rate of the two-dimensional code, so that a camera is required to be used for high-speed decoding; the system can support the color two-dimensional code, because the information content of the color two-dimensional code is larger; thirdly, as a network system, the decoding error rate of the system must be extremely low, and the decoding speed must be extremely high, so that the artificial intelligence technology is considered to assist decoding; and fourthly, because the positions of the screen and the camera are relatively fixed, the decoding task is fixed in position.
In general, the invention relates to a device for rapidly decoding a color two-dimensional code with a fixed position by using a high-speed camera and an artificial intelligence technology, and the hardware design and the matching software design of the method are both inventive contents. The invention does not relate to a coding side, namely a method for coding a network data packet into a color two-dimensional code, but has certain requirements on the technical specification of the coding side.
Disclosure of Invention
The invention provides a two-dimensional code high-speed decoding system, which aims to shoot a color two-dimensional code changing at a high speed by using a high-speed camera and provide backward support for a black and white two-dimensional code.
The invention is realized by the following technical scheme:
a two-dimensional code high-speed decoding method comprises the following steps:
step S1: positioning the position of the two-dimensional code, reading a picture for calibration from the high-speed camera, and positioning the position of the two-dimensional code;
step S2: measuring and calculating all the sites of the two-dimensional code, determining three positioning points of the two-dimensional code, then determining a positioning point at a right angle according to a triangle corner theorem, wherein the positioning point is an original point of a new coordinate system of the two-dimensional code, and deducing corresponding coordinates of each pixel point of the two-dimensional code in the new coordinate system according to the new original point of the coordinate, namely measuring and calculating all the sites of the two-dimensional code;
step S3: judging whether the positioning is finished or not, carrying out logic verification on the results of the steps S1 and S2, and returning to the step S1 to judge again if the results are found to be not in accordance with the two-dimensional code standard protocol; otherwise, go to step S4;
step S4: acquiring two-dimension codes, enqueuing, acquiring a whole picture from a data inlet of a high-speed camera, positioning the two-dimension codes in the picture, judging whether the picture is a black-and-white or a color two-dimension code according to the color space of the two-dimension code, splitting the picture into three RGB independent channels to form three two-dimension codes if the picture is the color two-dimension code, and sending the two-dimension codes into a two-dimension code queue through a multi-channel two-dimension code transmission channel;
step S5: decoding by using a Support Vector Machine (SVM) in a distributed mode, distributing each two-dimensional code to a multi-channel artificial intelligence decoding core through a multi-channel two-dimensional code distribution channel so as to realize parallelization high-speed decoding;
step S6: collecting results, dequeuing, transmitting the data obtained by distributed decoding in the step S5 to a decoded data queue through a decoding result aggregation path to finish data aggregation, sequentially placing result data packets in a target network data outlet through a decoding data transmission path by the data queue, finishing transmission, returning to the step S4, and restarting the main cycle.
Preferably, in step S1, except for the lower right corner of any two-dimensional code, the other three squares are positioning patterns for marking the size of the two-dimensional code rectangle, and the positioning patterns are used as standard lines, so as to prevent scanning skew which may occur after scanning due to an oversized two-dimensional code, the software of the present invention calculates three positioning points on the two-dimensional code through a positioning algorithm, and for the case that more than one two-dimensional code is located at the decoding end, the software of the present invention can adaptively position a plurality of two-dimensional codes.
Preferably, in step S5, for each artificial intelligence decoding core, only one two-dimensional code is processed at each time. Note that the position of each position point of the two-dimensional code is obtained in step S2, and this step does not need to reposition, and the position point is directly aligned, and the picture may be distorted due to the influence of illumination in the transmission process, and the present invention uses the SVM algorithm to recover the result.
Preferably, in the step S5, the reading of the position to be decoded is assumed to be x0The reading numbers of 8 sites of the upper left, upper right, right left, right, lower left, lower right are x1，x2，...，x8Together, they are written as x ═ x0，x1，...，x8}. Note that each position of the two-dimensional code is either a 0 or a 1, and thus this is a dichotomy problem. Thus, using a support vector machine:
wherein w ═ { w ═ w0，w1，...，w8The weight method vector is a group of weight method vectors obtained by statistics of a large number of two-dimensional codes; b is a bias term and is also obtained by large-scale test statistics, the meaning of the formula is that the result of one locus is 0 or 1, not only related to the reading of the locus, but also related to the reading of the periphery of the locus, and the setting is reasonable because the interference of illumination is usually local.
A two-dimensional code high-speed decoding system comprises a two-dimensional code display screen of a coding end, a high-speed camera, a USB3.0 data connectivity, a decoding server, an equipment external support, an Ethernet line and a target network, wherein the two-dimensional code display screen of the coding end is displayed on the two-dimensional code display screen of the coding end, the high-speed camera is aligned to the two-dimensional code display screen of the coding end, and the decoding end is connected with the target network of the target network through the Ethernet line 7.
Preferably, the decoding server is used for performing operations required for positioning and decoding the two-dimensional code.
Preferably, the offsite support is used to provide physical support for the various components.
Preferably, the ethernet line is used to place the decoded data to the target network.
Preferably, the data inlet of the high-speed camera transmits data to the two-dimensional code queue through a plurality of two-dimensional code transmission paths, the two-dimensional code queue transmits data to a plurality of artificial intelligence decoding cores through a plurality of two-dimensional code distribution paths, the plurality of artificial intelligence decoding cores transmit data to the decoded data queue through a decoding result aggregation path, and the decoded data queue transmits data to the target network data outlet through a decoding data transmission path.
The invention has the beneficial effects that: the invention relates to a two-dimension code high-speed decoding system, which uses a high-speed camera to shoot color two-dimension codes changing at a high speed, provides backward support for black and white two-dimension codes, uses an artificial intelligent SVM technology, can receive, position and analyze the two-dimension codes at the speed of more than 120 frames per second, removes error data, and transmits the error data to a target network, thereby providing stable and qualified strict physical separation for users having strict requirements on network safety.
Drawings
FIG. 1 is a diagram of the hardware architecture of the present invention.
FIG. 2 is a diagram of the software module architecture of the present invention.
FIG. 3 is a software logic flow diagram of the present invention.
The symbols in the figures represent:
1. the two-dimensional code display screen of the encoding end; 2. a color or black-and-white two-dimensional code; 3. a high-speed camera; USB3.0 data connectivity; 5. the decoding server is used for carrying out the operation required by positioning and decoding the two-dimensional code; 6. an offsite support for providing physical support for the components; 7. an Ethernet line for placing the decoded data to a target network; 8. a target network; 11. a high speed camera data entry; 12. a plurality of paths of two-dimensional code transmission paths; 13. a two-dimensional code queue; 14. a plurality of two-dimensional code distribution channels; 15. a multipath artificial intelligence decoding core; 16. a decoding result aggregation path; 17. a decoded data queue; 18. decoding a data transmission path; 19. and (4) data export of the target network.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, a two-dimensional code high-speed decoding system includes a two-dimensional code display screen 1 at a coding end, a color or black-and-white two-dimensional code 2 which is displayed on the two-dimensional code display screen 1 at the coding end and can change at a high speed, a high-speed camera 3, a USB3.0 data connectivity 4, a decoding server 5 for performing operations required for positioning and decoding the two-dimensional code, an off-device shelf 6 for providing physical support for each component, an ethernet cable 7 for placing decoded data to a target network, and a target network 8.
During construction, the system is erected on site, and the high-speed camera 3 is aligned to the two-dimensional code display screen 1 at the encoding end. The two-dimensional code of the two-dimensional code display screen 1 at the encoding end can be black and white or color. The refresh frequency of the two-dimensional code display screen 1 at the encoding end is not higher than 120 FPS. So as to ensure that the high-speed camera 3 contains the whole content of the two-dimensional code display screen 1 at the encoding end and does not contain other backgrounds as far as possible. The software of the application can be calibrated by itself without using other equipment for precise calibration. The decoding end is connected with the target network of the target network 8 by using the Ethernet line 7, and the hardware construction is finished.
As shown in fig. 2 and 3, in terms of software implementation, the high-speed camera data entry 11 transmits data to the two-dimensional code queue 13 through the multi-channel two-dimensional code transmission path 12, the two-dimensional code queue 13 transmits data to the multi-channel artificial intelligence decoding core 15 through the multi-channel two-dimensional code transmission path 14, the multi-channel artificial intelligence decoding core 15 transmits data to the decoded data queue 17 through the decoding result aggregation path 16, and the decoded data queue 17 transmits data to the target network data exit 19 through the decoded data transmission path 18.
A two-dimensional code high-speed decoding method comprises the following steps:
step S1: and positioning the position of the two-dimensional code. The software of the invention reads in a picture for calibration from a high-speed camera and carries out two-dimensional code position positioning. Specifically, except for the lower right corner of any two-dimensional code, the other three squares are positioning patterns and are used for marking the size of the rectangle of the two-dimensional code. The alignment pattern is used as a standard line to prevent scanning skew that may occur when scanning is performed after the alignment pattern is oversized. The software of the invention calculates three positioning points on the two-dimensional code through a positioning algorithm. For the condition that more than one two-dimensional code is positioned at the decoding end, the software of the invention can be used for positioning a plurality of two-dimensional codes adaptively.
Step S2: and measuring and calculating all the sites of the two-dimensional code. After the three positioning points of the two-dimensional code are determined, a positioning point at a right angle can be determined according to a triangle corner theorem. The positioning point is the origin of the new coordinate system of the two-dimensional code. And according to the new coordinate origin, the corresponding coordinates of each pixel point of the two-dimensional code can be deduced in a new coordinate system, namely all the sites of the two-dimensional code are measured out.
Step S3: and judging whether the positioning is finished or not. Performing logic check on the results of the steps S1 and S2, and returning to the step S1 to perform judgment again if the results are found not to meet the two-dimensional code standard protocol; otherwise, the process proceeds to step S4.
Step S4: and acquiring the two-dimension code and enqueuing. The whole picture is obtained from the high-speed camera data entry 11, and the two-dimensional codes in the picture are positioned, so that a plurality of two-dimensional codes are noticed. Whether the two-dimensional code is black and white or a color two-dimensional code is judged through the color space of the two-dimensional code, if the two-dimensional code is the color two-dimensional code, the two-dimensional code is split into three independent channels of RGB, and the three independent channels are changed into three two-dimensional codes. These two-dimensional codes are sent to a two-dimensional code queue 13 through a multi-path two-dimensional code transmission path 12.
Step S5: the distributed SVM is used for decoding, and each two-dimensional code is distributed to a multi-path artificial intelligence decoding core 15 through a multi-path two-dimensional code distribution path 14 so as to realize parallelization high-speed decoding.
For each artificial intelligence decoding core, only one two-dimensional code is processed at each moment. Note that the position of each locus of the two-dimensional code is already obtained in step S2, and this step is performed directly for loci without repositioning. Due to the influence of illumination in the transmission process, the picture may be distorted, and the method uses the SVM algorithm to recover the result.
Let the reading of the site to be decoded be x0The reading numbers of 8 sites of the upper left, upper right, right left, right, lower left, lower right are x1，x2，...，x8Together, they are written as x ═ x0，x1，...，x8}. Note that each position of the two-dimensional code is either a 0 or a 1, and thus this is a dichotomy problem. Thus, using a support vector machine:
wherein w ═ { w ═ w0，w1，...，w8The weight method vector is a group of weight method vectors obtained by statistics of a large number of two-dimensional codes; b is a bias term, also by large scale measurementsAnd (5) counting by trial. The significance of this formula is that the result for a site is 0 or 1, not only with respect to its own reading, but also with respect to its surrounding readings. This setting is reasonable since the disturbance of the illumination tends to be local.
Step S6: collect results, dequeue. The data obtained by distributed decoding in step S5 is transmitted to the decoded data queue 17 through the decoding result aggregation path 16, and data aggregation is completed. The data queue sequentially puts the result data packets to the target network data outlet 19 through the decoded data transmission path 18, and the transmission is completed. At this time, the process returns to step S4, and the main loop is restarted.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A two-dimensional code high-speed decoding method is characterized by comprising the following steps:
step S1: positioning the position of the two-dimensional code, reading a picture for calibration from the high-speed camera, and positioning the position of the two-dimensional code;
step S2: measuring and calculating all the sites of the two-dimensional code, determining three positioning points of the two-dimensional code, then determining a positioning point at a right angle according to a triangle corner theorem, wherein the positioning point is an original point of a new coordinate system of the two-dimensional code, and deducing corresponding coordinates of each pixel point of the two-dimensional code in the new coordinate system according to the new original point of the coordinate, namely measuring and calculating all the sites of the two-dimensional code;
step S3: judging whether the positioning is finished or not, carrying out logic verification on the results of the steps S1 and S2, and returning to the step S1 to judge again if the results are found to be not in accordance with the two-dimensional code standard protocol; otherwise, go to step S4;
step S4: acquiring two-dimension codes, enqueuing, acquiring a whole picture from a data inlet of a high-speed camera, positioning the two-dimension codes in the picture, judging whether the picture is a black-and-white or a color two-dimension code according to the color space of the two-dimension code, splitting the picture into three RGB independent channels to form three two-dimension codes if the picture is the color two-dimension code, and sending the two-dimension codes into a two-dimension code queue through a multi-channel two-dimension code transmission channel;
step S5: the distributed decoding is realized by using an SVM, and each two-dimensional code is distributed to a multi-path artificial intelligence decoding core through a multi-path two-dimensional code distribution path so as to realize parallelization high-speed decoding;
step S6: collecting results, dequeuing, transmitting the data obtained by distributed decoding in the step S5 to a decoded data queue through a decoding result aggregation path to finish data aggregation, sequentially placing result data packets in a target network data outlet through a decoding data transmission path by the data queue, finishing transmission, returning to the step S4, and restarting the main cycle.
2. The method according to claim 1, wherein in step S1, except for the lower right corner of any two-dimensional code, the other three squares are positioning patterns for marking the size of the two-dimensional code rectangle, the positioning patterns are used as standard lines, in order to prevent the scanning from being skewed after the size is too large, the software of the present invention calculates three positioning points on the two-dimensional code by using a positioning algorithm, and the software of the present invention can adaptively position a plurality of two-dimensional codes at the decoding end.
3. The two-dimensional code high-speed decoding method according to claim 1, wherein in step S5, for each artificial intelligence decoding core, only one two-dimensional code is processed at each time. Note that the position of each position point of the two-dimensional code is obtained in step S2, and this step does not need to reposition, and the position point is directly aligned, and the picture may be distorted due to the influence of illumination in the transmission process, and the present invention uses the SVM algorithm to recover the result.
4. The two-dimensional code high-speed decoding method according to claim 1, wherein in step S5, the reading of the position point to be decoded is assumed to be x0The reading numbers of 8 sites of the upper left, upper right, right left, right, lower left, lower right are x1，x2，...，x8Together, they are written as x ═ x0，x1，...，x8}. Note that each position of the two-dimensional code is either a 0 or a 1, and thus this is a dichotomy problem. Thus, using a support vector machine:
wherein w ═ { w ═ w0，w1，...，w8The weight method vector is a group of weight method vectors obtained by statistics of a large number of two-dimensional codes; b is a bias term and is also obtained by large-scale test statistics, the meaning of the formula is that the result of one locus is 0 or 1, not only related to the reading of the locus, but also related to the reading of the periphery of the locus, and the setting is reasonable because the interference of illumination is usually local.
5. The system of the two-dimensional code high-speed decoding method according to claim 1, comprising a two-dimensional code display screen at the encoding end, a high-speed camera displayed on the two-dimensional code display screen at the encoding end, USB3.0 data connectivity, a decoding server, an external device support, an Ethernet line and a target network, wherein the high-speed camera is aligned with the two-dimensional code display screen at the encoding end, and the decoding end is connected with the target network of the target network by using the Ethernet line 7.
6. The two-dimensional code high-speed decoding system according to claim 5, wherein the decoding server is configured to perform operations required for positioning and decoding the two-dimensional code.
7. The two-dimensional code high-speed decoding system according to claim 5, wherein the off-device support is configured to provide physical support for each component.
8. The two-dimensional code high-speed decoding system according to claim 5, wherein the Ethernet cable is used for placing the decoded data to a target network.
9. The two-dimensional code high-speed decoding system according to claim 5, wherein the high-speed camera data entry transmits data to the two-dimensional code queue through a plurality of two-dimensional code transmission paths, the two-dimensional code queue transmits data to a plurality of artificial intelligence decoding cores through a plurality of two-dimensional code distribution paths, the plurality of artificial intelligence decoding cores transmit data to the decoded data queue through a decoding result aggregation path, and the decoded data queue transmits data to the target network data exit through a decoding data transmission path.
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