CN117579755A - Physical isolation data ferrying method and system based on high-density color data matrix image - Google Patents

Physical isolation data ferrying method and system based on high-density color data matrix image Download PDF

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CN117579755A
CN117579755A CN202311572111.5A CN202311572111A CN117579755A CN 117579755 A CN117579755 A CN 117579755A CN 202311572111 A CN202311572111 A CN 202311572111A CN 117579755 A CN117579755 A CN 117579755A
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data
matrix
image
color
decoding
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高椿明
凃海洋
曾俊涛
李攀
吴家建
陈国兴
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Lhasa Jiahui Technology Co ltd
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Lhasa Jiahui Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
    • H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
    • H04N1/32203—Spatial or amplitude domain methods
    • H04N1/32261—Spatial or amplitude domain methods in binary data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
    • H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
    • H04N1/32267—Methods relating to embedding, encoding, decoding, detection or retrieval operations combined with processing of the image
    • H04N1/32272—Encryption or ciphering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
    • H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
    • H04N1/32309—Methods relating to embedding, encoding, decoding, detection or retrieval operations in colour image data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/44—Secrecy systems
    • H04N1/448—Rendering the image unintelligible, e.g. scrambling
    • H04N1/4486—Rendering the image unintelligible, e.g. scrambling using digital data encryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
    • H04N23/85—Camera processing pipelines; Components thereof for processing colour signals for matrixing

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Hardware Design (AREA)
  • Computer Security & Cryptography (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Image Processing (AREA)

Abstract

The invention relates to the technical field of information safety, and discloses a physical isolation data ferrying method and a physical isolation data ferrying system based on a high-density color data matrix image, wherein in the encoding stage, a bit stream and RGB (red, green and blue) arrangement and combination mode is used for carrying out color value conversion, the information quantity which can be embedded in a single image far exceeds the information quantity which can be contained in a color two-dimensional code under the same pixel, and then the speed of bit stream color value image is improved based on a multi-process matrix operation mode, so that the encoding speed of an integral file is improved; in the decoding stage, shooting and decoding asynchronous processing is carried out based on multiple processes, and a dynamic positioning algorithm and a color value threshold value matrix calculation method are adopted to obtain the central coordinate position of each color block in the color data matrix image and RGB three-channel color value threshold value data, so that the image with information data is quickly and correctly decoded. The invention creates the possibility of realizing stable, reliable and quick data transmission under the condition of physical isolation.

Description

Physical isolation data ferrying method and system based on high-density color data matrix image
Technical Field
The invention relates to the technical field of information security, in particular to a physical isolation data ferrying method and system based on a high-density color data matrix image.
Background
The rapid development of information communication technology and internet technology changes our living and working modes, improves our working efficiency, but brings about a lot of security problems, such as network information leakage, viruses and the like, which seriously threaten the information security of enterprises and institutions. The traditional information security protection technology only detects and controls data transmission at a software layer, and cannot meet the requirement of physical isolation between a secret-related network and an external unsafe network.
The physical isolation data ferrying technology is widely applied to secret-related units such as armies, government enterprises and the like as a network security technology for realizing information transmission among different secret-level networks in a pure physical isolation environment. Compared with the traditional methods of optical disc writing, infrared and the like, the traditional physical isolation information exchange transmission method based on the data matrix image has the advantages of convenience in management, simplicity in operation, low resource consumption and the like. However, the conventional image-based data transmission method has the defects of low coding and decoding efficiency, low transmission speed and the like due to the characteristics of limited information bearing capacity, low data density and the like of the conventional two-dimensional code (OR code).
For example, CN114268454a discloses a data ferrying method for a physical isolation environment, where the obtained target data is divided into a plurality of data packets according to a preset program, and each data packet includes a plurality of data frames; each data frame is encoded one by one, and corresponding color two-dimensional codes are generated; the intranet plays the generated color two-dimensional codes one by one; the outer network shoots the color two-dimensional codes played by the inner network one by one, decodes the shot color two-dimensional codes one by one, and finally recovers the target data.
According to the prior art, the single image generated by the patent has small storable capacity, the operation speed of the whole image coding and decoding process is low, and the data transmission speed under the physical isolation condition is greatly reduced.
Disclosure of Invention
In order to solve the problems and the defects in the prior art, the invention provides a physical isolation data ferrying method and a physical isolation data ferrying system based on a high-density color data matrix image, which are characterized in that in the encoding stage, a bit stream and RGB (red, green and blue) arrangement and combination mode is used for carrying out color value conversion, the information quantity which can be embedded in a single image is far beyond the information quantity which can be contained in a color two-dimensional code under the same pixel, and then the speed of bit stream color value image is improved based on a multiprocessing matrix operation mode, so that the overall file encoding speed is improved; and in the decoding stage, shooting and decoding asynchronous processing is carried out based on multiple processes, and a dynamic positioning algorithm and a color value threshold value matrix calculation method are adopted to obtain the central coordinate position of each color block in the color data matrix image and RGB three-channel color value threshold value data, so that the image with information data is quickly and correctly decoded. The invention creates the possibility of realizing stable, reliable and quick data transmission under the condition of physical isolation.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the method comprises the steps of initializing an external network end and an internal network end, encoding external network end data and decoding internal network end data, and specifically comprises the following steps:
A. external network end and internal network end initialization
A.1. External network end initialization
S101, respectively displaying three initializing images, namely a dot matrix image, a pure black image and a pure white image by display equipment according to a set time interval;
A.2. intranet end initialization
S201, the image acquisition equipment shoots a dot matrix image, a pure black image and a pure white image which are played by the external network display equipment one by one, and firstly, a dynamic positioning algorithm is adopted to dynamically position the dot positions of the data matrix image according to the pure black image and the dot matrix image, so as to obtain a dot matrix PM;
s202, extracting a black color value matrix BM of a pure black image and a white color value matrix WM of a pure white image according to a point position matrix PM, and then calculating a color value threshold value matrix CM of the corresponding point position matrix of the image;
B. external network end data coding
S102, the encoding equipment reads the length of binary stream data of target data, and calculates the number of images which can be generated by the current target data according to the length of the binary stream data and the length value row and the width value col of the color data matrix image to be generated;
S103, dividing the binary stream data of the read target data into n bit streams with the length of row 'col' 3, and then respectively performing matrix operation on the n bit stream data with the length of row 'col' 3 to convert the bit stream data into a corresponding three-dimensional matrix M1 i (row，col，3)；
S104, converting the description information of the target data as packet header information into bit stream data, performing matrix operation, and converting the bit stream data into a three-dimensional matrix M2 i (2,col,3)；
S105, a data matrix M1 i Performing row exclusive-or and column exclusive-or operation, splicing the obtained row exclusive-or values, and converting the spliced row exclusive-or values into a three-dimensional matrix M3 i (2, col, 3) sequentially concatenating the matrices M2 i 、M3 i M1 i The spliced data matrix is M4 i (row+4, col, 3) data matrix M4 i Storing the color data matrix image as a vector image, and finally forming a color data matrix image;
s106, the display equipment plays the generated color data matrix images one by one;
C. intranet-side data decoding
S203, shooting a color data matrix image played by the display device by the image acquisition device, extracting the point positions of the shot image by the decoding device according to the point position matrix PM, acquiring a data matrix DM of the image shot by each frame of the image acquisition device, converting the data matrix DM into a (0, 1) data matrix DM 'to finish the numerical extraction work of each frame of data, and storing binary data of the matrix DM' obtained after conversion;
Step S204, the decoding equipment firstly acquires bit stream data related to a data storage data identifier in a matrix DM ', performs bit stream character string processing on the bit stream data, checks whether the data storage data identifier exists, directly discards the matrix if the data storage data identifier does not exist, performs row exclusive-OR and column exclusive-OR calculation on the data in the matrix DM', compares the obtained value with an original exclusive-OR value in the matrix DM ', stores the matrix DM' if the obtained value is the same as the original exclusive-OR value, and stores packet header information in the matrix as basic information in a redis list to be processed;
s205, the file restoring device reads basic information in the redis list, finds out a corresponding DM ' matrix according to the information, performs data splicing processing according to the sequence after reading bit streams of the DM ' matrix, and performs file restoring operation on bit stream data obtained by splicing after all DM ' matrix data of target data are spliced.
Preferably, in the present invention, when the number of images that can be generated by calculating the target data is a fraction, the binary stream data of the target data is data-padded, and the padded data is bit (0).
Preferably, in the present invention, the calculation expression of the number of the generated images of the calculation target data is n=l/(row×col×3), n is the number of images, and L is the binary data stream length.
Preferably, in the present invention, when data padding is performed, the number of padded bits (0) is a, a= (row×col×3) -mod (L, (row×col×3)), and L is the binary data stream length.
Preferably, in the present invention, the description information of the target data includes a file name and size, currently encoded i-th block bit stream data, the number of file stuffing bits (0), a file creation time, and a data storage data identifier.
Preferably, in the present invention, the dynamic positioning algorithm includes: (1) Reading matrix data MPP of the dot matrix image and matrix data BPP of the pure black image, and obtaining a new matrix MPP 'through MPP' =MPP-BPP; (2) Performing binarization processing on MPP', obtaining a first central point of an image, obtaining a second central point of the same line according to the first central point through a fixed value distance, and similarly obtaining all central points corresponding to the line; (3) Obtaining a second central point of the column according to the first central point by a fixed value distance, and obtaining all corresponding central points of the column by analogy; (4) The information of all the central points of the rows and columns is combined into a point matrix PM.
Preferably, in the present invention, the method of converting the data matrix DM into the (0, 1) data matrix DM' is specifically as follows:
The data matrix DM is first converted into an intermediate matrix Q by the calculation of q=dm-CM, then the value smaller than 0 in the intermediate matrix Q is set to 0, and the value larger than 0 is set to 1, and finally a new data matrix DM' is generated.
As preferable, in the present invention, the display device may be a device that displays a screen, a display, or the like, which can output an image; the image acquisition device may be a device with an image acquisition function, such as a CMOS industrial camera, and the pixels are typically 500 ten thousand pixels.
The system is used for realizing the data ferrying method and comprises a transmitting end host system connected with a network A and a receiving end host system connected with a network B; the sending end host system is an external network coding end and is used for receiving data transmitted by the network A and coding the data, and playing and displaying the image after the corresponding image is generated by coding; the receiving end host system is an intranet decoding end and is used for collecting images displayed by the sending end host system, decoding the collected images to release data, and therefore unidirectional data ferrying among the physical isolation networks is completed.
Preferably, in the present invention, the system includes:
The code initialization unit is arranged in the transmitting end host system and is used for generating an initialization image according to a set time interval and transmitting the initialization image to the display unit;
the data coding unit is arranged in the sending end host system and is used for receiving the target data transmitted by the network A, coding the target data, generating a corresponding color data matrix image and transmitting the corresponding color data matrix image to the display unit;
the display unit is arranged in the sending end host system and is used for receiving the images transmitted by the coding initialization unit and the data coding unit and playing and displaying the images;
the image acquisition unit is arranged in the receiving end host system and is used for acquiring the image played and displayed by the display unit;
the decoding initialization unit is arranged in the receiving end host system and is used for acquiring an initialization image according to the image acquisition unit and generating initialization data;
the data decoding unit is arranged in the receiving end host system and used for decoding the color data matrix image according to the color data matrix image acquired by the image acquisition unit and the generated initialization data so as to release data;
the file restoring unit is arranged in the receiving end host system and is used for carrying out file restoring operation on the data obtained by decoding by the data decoding unit.
The invention has the beneficial effects that:
1. in the data transmission process, the information capacity of the single Zhang Caise data matrix image storage generated in the data encoding stage is improved in quality compared with the traditional two-dimensional code image which can be identified by a camera under the same screen; and the image generation speed is about 10 times faster than that of the traditional two-dimensional code, the data coding speed can reach 10MB/s, and the method creates possibility for rapidly transmitting a large amount of data under the physical isolation condition.
2. The invention adopts the scroll compression mechanism to process the large file, and can be used for improving the correct rate of correct decoding after retransmitting the file when the large file fails to be transmitted.
Drawings
The foregoing and the following detailed description of the invention will become more apparent when read in conjunction with the following drawings in which:
FIG. 1 is a diagram of a system architecture of the present invention;
FIG. 2 is a schematic representation of a color data matrix image generated in accordance with the present invention;
FIG. 3 is a diagram of bit color value conversion according to the present invention;
fig. 4 is a dot matrix diagram generated by the present invention.
Detailed Description
In order for those skilled in the art to better understand the technical solutions of the present invention, the following embodiments will further illustrate the technical solutions for achieving the object of the present invention, and it should be noted that the technical solutions claimed in the present invention include, but are not limited to, the following embodiments. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, based on the embodiments of the present invention shall fall within the scope of protection of the present invention.
The physical isolation data ferrying technology is widely applied to secret-related units such as armies, government enterprises and the like as a network security technology for realizing information transmission among different secret-level networks in a pure physical isolation environment. Compared with the traditional methods of optical disc writing, infrared and the like, the traditional physical isolation information exchange transmission method based on the data matrix image has the advantages of convenience in management, simplicity in operation, low resource consumption and the like. However, the conventional image-based data transmission method has the defects of low coding and decoding efficiency, low transmission speed and the like due to the characteristics of limited information bearing capacity, low data density and the like of the conventional two-dimensional code (OR code).
Based on the above, the embodiment of the invention provides a physical isolation data ferrying method and a physical isolation data ferrying system based on a high-density color data matrix image, in the encoding stage, the color value conversion is carried out by a bit stream and RGB (red, green and blue) arrangement and combination mode, the information quantity which can be embedded in a single image far exceeds the information quantity which can be contained in a color two-dimensional code under the same pixel, and then the speed of bit stream color value image is improved based on a multi-process matrix operation mode, so that the encoding speed of an overall file is improved; in the decoding stage, shooting and decoding asynchronous processing is carried out based on multiple processes, and a dynamic positioning algorithm and a color value threshold value matrix calculation method are adopted to obtain the central coordinate position of each color block in the color data matrix image and RGB three-channel color value threshold value data, so that the image with information data is quickly and correctly decoded. The invention creates the possibility of realizing stable, reliable and quick data transmission under the condition of physical isolation.
Firstly, when data transmission is performed under a physical isolation network, two networks a and B which are physically isolated through a unidirectional isolation channel and have different security levels are generally set, then an encoding device and a display device are set in a transmitting end host system connected with the network a, and a decoding device and an image acquisition device are set in a receiving end host system connected with the network B. When data transmission is carried out, the encoding equipment encodes data transmitted by the network A received by the encoding end host system, corresponding image data is generated, then the image is sent to the display equipment for display, then the image acquisition equipment in the receiving end host system is utilized for identifying and receiving the image data on the display equipment and transmitting the image data to the decoding equipment, finally the decoding equipment decodes the image to obtain related data contained in the image, and finally the transmission of the data under a physical isolation network is realized. The invention provides a physical isolation data ferrying method and a physical isolation data ferrying system based on a high-density color data matrix image, which are an external network end file encoding process performed in a sending end host system and an internal network end decoding process performed in a receiving end host system, wherein the sending end host system encodes target data to be transmitted to generate a color image identifiable by the receiving end host system, and then the receiving end host system performs appointed decoding operation on the color image to obtain information data contained in the image.
The embodiment of the invention firstly discloses a physical isolation data ferrying method based on a high-density color data matrix image, which mainly comprises an external network end data encoding process executed by a transmitting end host system and an internal network end data decoding process executed by a receiving end host system, wherein the specific encoding and decoding processes are as follows:
A. external network end and internal network end initialization
Before formally encoding and decoding data, an external network encoding end where a host system of a transmitting end is located and an internal network decoding end where a host system of a receiving end is located are respectively initialized. When the coding end is initialized, corresponding numbers are displayed on a display screen at first, the decoding end continuously shoots and carries out digital identification on each image until the coding end is found to start initialization operation when the shot images are identified to have numbers, and the decoding end is also ready to carry out initialization operation at the moment. And then the display screen of the encoding end sequentially displays three images, namely a dot matrix image PP, a pure black image BP and a pure white image WP according to a set time interval, the decoding end restarts the shooting function, shoots the dot matrix image PP, the pure black image BP and the pure white image WP played by the display screen of the encoding end at a set speed, and then decoding equipment of the decoding end performs dot matrix operation and threshold matrix operation according to the three shot images to realize initialization.
The decoding end completes the initialization operation after playing the three images, namely the dot matrix map PP, the pure black image BP and the pure white image WP, and the decoding end also needs to perform one dot matrix operation and threshold matrix operation according to the three images although the dot matrix map PP, the black image and the white image are shot at the moment, so that the decoding end can perform the data encoding operation at set intervals after playing the three images. The digital image, the dot matrix map PP, the pure black image BP and the pure white image WP played by the decoding end all belong to the initialized image.
In the invention, in the process of initializing the coding end, the sequence of the three images (point position diagram, black diagram and Bai Tu) displayed on the display screen can be exchanged, and only the label is needed to be made in the decoding process. In order to improve the efficiency of data transmission, a plurality of display screens are adopted at the encoding end to display images generated by the encoding system, so that the decoding end can acquire image data played on the display screens by a corresponding number of cameras, each display screen and each camera are in one-to-one correspondence, that is, each camera only acquires images on the display screen corresponding to the camera, for convenience in operation and management, the display screens and the cameras can be numbered, for example, one camera corresponds to one display screen, and each display screen and the camera corresponding to the display screen can respectively execute the initialization process.
In the present invention, the digital image recognition at the decoding end is performed by the existing prior art, and will not be further developed herein.
In the present invention, it should be further noted that, the dot matrix map PP is calculated according to the screen size of the display device, for example, assuming that the created color data matrix image is displayed on a screen with a size of 2560×1440 in full screen, and is correctly photographed and decoded by the decoding device at the intranet end, the present invention defines that the size of a single color block is 7*7 pixels, the color value information within the range of 7*7 pixels is the same, the center point position of 7*7 is white, the rest point positions are black, and a dot matrix map PP is formed, where each dot can occupy 3 bits of data, so that it can be calculated that the image contains 2560/7=365 columns, 1440/7=205 rows, 365×205= 74825 color blocks in total, and therefore, the maximum receivable information amount of a single color data matrix image generated by the present invention is 74825×3/8/1024=27.4 KB, where 8 represents bit to Byte and 1024 is converted to Byte. Therefore, the color data matrix image generated by the invention is far more than the identifiable color two-dimensional code which can hold information (less than 1 KB) under the same pixel, and creates possibility for realizing stable, reliable and rapid data transmission under the physical isolation condition. In the present invention, the rows and columns of the image are related to the resolution of the display screen, and the rows and columns directly affect the single highest receivable information amount of the finally generated color data matrix image, so that the receivable information amount of the single image generated by the present invention is directly related to the resolution of the display screen at the encoding end.
The pure black image is that RGB channel values of all pixel points in the image are zero; the pure white image is that the RGB channel values of all pixel points in the image are 255.
The bit position matrix operation and the threshold matrix operation related to the initialization of the decoding equipment of the intranet decoding end are specifically as follows:
a. performing point location matrix operation:
the method comprises the steps that a camera at an inner network terminal shoots a dot matrix image PP, a pure black image BP and a pure white image WP which are played by a display screen at an outer network terminal respectively, and firstly, a dynamic positioning algorithm is adopted to dynamically position the dot positions of a data matrix image according to the pure black image BP and the dot matrix image PP to obtain a dot matrix PM; the specific process of the dynamic positioning algorithm is as follows:
(1.1) reading matrix data MPP of a dot matrix image PP and matrix data BPP of a pure black image BP, and eliminating interference of a light leakage part of an edge screen in a mode of MPP '=MPP-BPP to obtain a new matrix MPP';
(1.2) performing binarization processing on the matrix MPP' to obtain a first central point position (x, y) of the image, obtaining a second central point position of the same row according to the first central point position through a fixed value distance, and obtaining all corresponding central point positions of the rows in a pushing way;
(1.3) obtaining a second central point of the column according to the first central point by a fixed value distance, and obtaining all corresponding central points of the column by analogy;
(1.4) combining the information of all the dots of the rows and the columns to form a dot matrix PM.
In the invention, the first center point of the image can be determined by calculating the distance between each point in the image and the origin of the image, and the point with the shortest distance from the origin in the image is the first center point. The origin of the image is the top left corner vertex.
In the invention, the fixed value distance is set according to the actual requirement.
b. Color value threshold matrix calculation
(2) The decoding device extracts a black color value matrix BM of the pure black image BP and a white color value matrix WM of the pure white image WP according to the point matrix PM, and calculates a color value threshold value matrix CM of the corresponding point matrix of the image, wherein a calculation formula is CM= (WM-BM) 0.5.
In the present invention, extracting the black color value matrix BM of the solid black image BP from the dot matrix PM refers to extracting RGB channel values of the solid black image in all coordinates according to each coordinate point in the dot matrix PM, and then combining to obtain the black color value matrix BM, and similarly obtaining the white color value matrix WM.
After the initialization of the external network coding end is completed, the host system of the transmitting end formally performs the following data coding operation, and the specific process is as follows:
B. external network end data coding
Step S102, receiving target data transmitted by a network A by coding equipment of an outer network coding end, reading the binary stream data length L of the target data, and obtaining the number n of color images which can be generated by the current target data according to the length L of the binary stream data and a length value row and a width value col of a color data matrix image which are set in advance by the coding equipment of the outer network coding end, wherein the number n is calculated by the following calculation formula:
n＝L/(row*col*3)。
In some embodiments, it is also generally necessary to verify the integrity of the data before reading the binary information of the target data, to prevent incomplete data when post-transcoding to generate a color data matrix image. The specific verification mode is as follows:
whether the data is complete or not is judged by calculating whether the size of the incoming data is increased or not in real time: if the data is growing, repeatedly waiting and comparing the data size at the current moment with the data size at the last moment until the data size is consistent with the data size at the current moment, and exiting the integrity check. That is, in the case of performing the repetitive detection of data, if the size of the data does not change by any size within a prescribed time range (the range is extremely small, and lines are all between 0.1s and 1 s), it is confirmed that the detected data is a complete one without any problem.
After the data integrity check is completed, for oversized data such as several G, if the oversized data is loaded into the memory at one time and transcoding calculation is performed, the memory overflow phenomenon may be caused, so that the oversized data needs to be split into small data for encoding processing. That is to say, after finishing the data integrity check, the binary information of the data is read and sliced into the computer memory, the slicing size can be customized, the invention defaults to adopt a 1GB mode to carry out slicing operation, and the data size loaded into the computer memory each time can be accurately controlled.
The compression and scroll separation mechanism is embodied at the encoding end and the decoding end of the invention, and has the main effects that large files such as files exceeding 2G are divided into small files according to a bit stream dividing method, then the small files are encoded in sequence and transmitted, the decoding end needs to decode the small files in sequence, finally the small files are restored, bit streams of the small files are respectively read, and finally the large files are spliced. The reason for the adoption of the mechanism of the invention mainly comprises the following points: (1) If the data transmitted by the a network is larger than the memory size of the host system of the sender, for example, the memory size of the host system of the sender is 8G, and the size of the data transmitted by the a network is 9G, the dangerous behavior of memory overflow will be definitely caused, so that the file needs to be compressed (the size of the transmitted data is reduced, thereby improving the overall transmission speed), and then the file is divided (the size of a single transmitted file is reduced, and the danger of memory overflow is removed). The main process of encoding and decoding is as follows: firstly, the file transmitted by the A network is required to be subjected to file integrity verification, then the size of the file is judged, if the size exceeds 2G (the size is not fixed, 1G or 2G are optimally adopted, the parameter is not set too high, at least one fourth of the memory size and below is required to ensure that the memory does not overflow, the system is not blocked), the file is subjected to file compression processing, bit stream segmentation is carried out, and the file (after being compressed, the size of the file is 4G) is mainly divided into 8 small files with the size of 512MB according to the size of 512MB, and then the small files are sequentially encoded and transmitted. At the decoding end, after restoring the 8 small files with the size of 512MB, sequentially reading bit stream data of each small file, sequentially completing bit stream data splicing, restoring the small files into a large compressed file, and finally decompressing the large compressed file to completely finish the process of restoring the large file by encoding and decoding. (2) In the process of using the system to transmit data, uncontrollable factors such as system blocking and data loss can be inevitably caused, when a large file is transmitted, the data of a certain image is not restored, and the whole file is restored to fail, even if the file is retransmitted, even if the file is equally plagued by the compression and rolling mechanism, if the condition that the 5 th small file fails after the first transmission occurs, the retransmission is selected, the 4 th small file is restored to fail the second time, and at the moment, the union set of the first second success is taken, and the direct restoration is also successful, so that the probability of successfully decoding after the file is retransmitted when the large file is transmitted to fail can be improved.
In some embodiments, in general, the length L of binary data of the target data to be transmitted is not exactly a multiple of row_col_3, that is, the number n of images obtained by final calculation is not a positive integer but a fraction, so when the result n of calculation is a fraction, the last image generated belongs to an incomplete image, so we need to fill the target data with data, so that the binary data length of the target data satisfies the multiple of row_col_3 after filling, and the filled data is bit (0), then the number a of filled bit (0) is (row_col_3) -mod (L, (row_col_3)), and the binary length of the current target data becomes L ' =l+a after filling the bit (0), where the number n=l '/' of color data matrix images that can be generated by the target data is required.
In the present invention, a color data matrix image has row columns and col columns, so there can be row color blocks, and a color block can contain 2 3 The number of binary numbers (i.e., length) that a single code can accommodate is row 3, i.e., 8 colors.
S103, after the step S101, the encoding device starts matrix operation to generate a three-dimensional data matrix M1 i Because the matrix operation is CPU intensive operation, the invention adopts multi-process to accelerate operation, and compared with single process, the multi-process operation efficiency is related to the number of the multi-process used by the single process. The matrix operation mode specifically comprises the following steps: dividing the read bit stream data of the target data into n bit streams with the length of row 'col' 3, then respectively carrying out matrix operation on the n bit stream data with the length of row 'col' 3, and converting the bit stream data into a corresponding three-dimensional matrix M1 i (row, col, 3), i denotes the i-th bit stream number of the splitThe value of i is 1-n.
Here, the length of the binary stream data of the target data is L 'if the target data is not padded, and is L' if the target data is padded; if the data is not filled, the number n of divided bit streams is the same as the number of color data matrix images that can be generated and calculated in step S101, and if the data is filled, the number n of divided bit streams is the same as the number of images that can be generated after the data is filled.
In the present invention, row also represents the number of rows of the generated color data matrix image, and col also represents the number of columns of the generated color data matrix image. Therefore, the matrix operation is to convert the bit stream information with the length of row×col×3 into a three-dimensional matrix, where x, y, and z of the three-dimensional matrix are row, col, and 3, respectively.
Step S104, the encoding device converts the description information such as the file name and the size of the target data, the bit stream data of the i-th block row 3 of the current encoding, the number a of bits (0) filled by the file, the file receiving time, the data storage data identifier and the like into bit stream data as packet header information, then performs matrix operation, and converts the bit stream data into a three-dimensional matrix M2 i (2,col,3)。
In the present invention, the file receiving time may be understood as the time when the target data transmitted by the network a is received by the sender host system.
S105, the encoding device performs three-dimensional data matrix M1 i Performing row exclusive-or and column exclusive-or operation, splicing the obtained row exclusive-or values, and converting the spliced row exclusive-or values into a three-dimensional matrix M3 i (2, col, 3) then according to M2 i 、M3 i 、M1 i Sequentially spliced matrix of (a) to finally form a three-dimensional data matrix M4 i (row+4, col, 3), matrix M4 i And finally generating matrix data of the image, storing the matrix into a vector diagram through opencv to finish the integral coding operation of the data, and finally generating a color data matrix image at a coding equipment end.
It should be noted that the present invention provides for improving the efficiency of data transmissionEach display screen only displays the images under the storage paths, and the storage paths and the display screens are in one-to-one correspondence matching relation. Thus, the encoding device generates a three-dimensional matrix M4 in pairs i When the matrix is stored, a judgment is made on the storage path, so that the matrix is stored in the correct path and displayed on the corresponding display screen. When calculating the storage path, the formula imodk can be used for carrying out remainder operation, the remainder is the storage path corresponding to the three-dimensional matrix generated in the process, i represents the i-th bit stream data (i.e. the i-th bit stream data formed by dividing the binary data stream of the target data in the previous process), and k is the number of the display devices. For example, the invention has four display screens (k=4), then there are four storage paths, the storage paths can be respectively defined as 0,1,2 and 3, and respectively correspond to the four display screens, if the 3 rd bit stream data is currently encoded, 3mod 4=3, then the data is correspondingly generated into three-dimensional data moment M4 i Stored in the path with the number of 3, if the current encoding is 4 th bit stream data, 4mod 4=0, the data is correspondingly generated into three-dimensional data moment M4 i Stored into the path numbered 0, and so on. Correspondingly, in order to more conveniently and rapidly store data, the numbers of the cameras and the display screens are synchronous with the numbers of the storage paths, namely, the No. 0 storage path corresponds to the No. 0 display screen, the No. 0 display screen corresponds to the No. 0 camera, so that the No. 0 display screen correspondingly displays images appearing under the No. 0 storage path, and the No. 0 camera photographs images played on the No. 0 display screen.
And S106, after an image appears under a storage path corresponding to a display screen positioned at an outer network coding end (a controller of the display screen scans the corresponding storage path in real time and concurrently), carrying out full screen display on the image, and controlling the display speed of the display screen to be 150ms (6.7 frames).
Meanwhile, the receiving end host system at the intranet end also decodes the color data matrix image generated by encoding of the transmitting end host system at the extranet end, and the specific process is as follows:
C. intranet-side data decoding
Step S203, a camera at an intranet decoding end shoots a color data matrix image played by a display screen at an encoding end, decoding equipment at the intranet decoding end performs point location extraction on the color data matrix image shot by the camera according to a point location matrix PM, so as to obtain a data matrix DM shot by each frame of the camera, the data of the matrix DM is distributed in a (0, 255) interval at the moment, the matrix DM is mapped into a (0, 1) data matrix, the matrix DM is firstly converted into an intermediate matrix Q through Q=DM-CM calculation, the data in the intermediate matrix Q is distributed in a (-255, 255) interval, then the value smaller than 0 in the intermediate matrix Q is set as 0, the value larger than 0 is set as 1, finally, a new matrix DM 'is generated, namely the (0, 1) data matrix formed by DM mapping, finally, the value extraction work of each frame of data is completed, and binary data storage is carried out on the DM' matrix after mapping is completed.
In the invention, in order to ensure that each frame of image presented by the coding end is shot by the camera of the decoding end, all cameras of the decoding end shoot the image displayed on the screen of the coding end by adopting a frame rate of 3 times. The 3-time frame rate refers to that the shooting frame rate of the camera is 3 times of the display frame rate of the display screen.
Step S204, decoding the obtained DM ' matrix by the decoding equipment, firstly obtaining bit stream data of the first two rows of the DM ' matrix, carrying out bit stream character string processing on the bit stream data, checking whether a data storage data identifier exists or not, if not, directly discarding the matrix, if so, carrying out row exclusive OR and column exclusive OR calculation on data below four rows of the DM ' matrix, comparing the obtained exclusive OR value with data of the third row and the fourth row in the DM ' matrix, if the values are the same, representing useful file information of the data matrix data, storing the DM ' and storing basic information of the matrix stored in the first two rows into a redis list for processing.
In the present invention, in order to facilitate the decoding operation, header information of the target data is generally stored in the first rows of the data matrix, for example, the first two rows may store information such as a data storage identifier, a file name, etc. of the target data, and the third row and the fourth row may store the original exclusive-or values, etc.
S205, the file restore device at the intranet end reads the basic information in the redis list, finds the corresponding DM ' according to the information, performs data splicing processing according to the sequence after reading the bit stream of the DM ', and performs file restore operation on the bit stream data obtained by splicing after the DM ' data of the file are spliced.
In the present invention, the color data matrix image is generated by performing color value conversion by a combination of bit stream and RGB (refer to table 1 below), and referring to fig. 3 of the specification, the bit stream 000001010100110101011 is converted into a corresponding image of black+blue+green+red+yellow+violet+cyan+white, and the complete color data matrix image is shown in fig. 2. In addition, the invention improves the speed of bit stream color value images based on a matrix operation mode, thereby improving the overall coding speed, wherein the coding speed reaches 10MB/s, the number of color block rows (row) columns (col) in the images is 365 and 205 on the premise of being identified, and the embeddable information quantity of a single image under the identifiable condition is as follows: the row is 3/1024/8=27.4kb, which is far beyond the information content (less than 1 KB) of the identifiable color two-dimensional code under the same pixel, thus creating the possibility of realizing stable, reliable and rapid data transmission under the physical isolation condition.
Based on the same inventive concept, the embodiment of the invention also provides a physical isolation data ferrying system based on the high-density color data matrix image, wherein the system is used for realizing the data ferrying method under the physical isolation condition, and concretely, referring to fig. 1 of the specification, the system comprises: two networks A and B with different security levels and a transmitting end host system connected with the network A and a receiving end host system connected with the network B are physically isolated through a unidirectional isolation channel; the transmitting end host system is an external network coding end and is mainly used for receiving data transmitted by the network A, coding the data to generate a corresponding color data matrix image, and playing and displaying the generated image; the receiving end host system is an intranet decoding end and is mainly used for collecting images displayed by the sending end host system, decoding the collected images to release data, and therefore unidirectional data ferrying among the physical isolation networks is completed. The specific architecture of the system is as follows:
the transmitting end host system comprises the following functional units:
the code initialization unit is used for generating an initialization image according to a set time interval and sending the initialization image to the display unit;
The data coding unit is used for receiving the data transmitted by the network A, coding the data, generating a color data matrix image and transmitting the color data matrix image to the display unit;
the display unit is used for receiving the image data transmitted by the coding initialization unit and the data coding unit and playing and displaying the image data;
the receiving end host system comprises the following functional units:
the image acquisition unit is used for acquiring the images displayed by the display unit, and comprises an initialization image and a color data matrix image for displaying;
the decoding initialization unit is used for acquiring an initialization image of the coding end according to the image acquisition unit and generating initialization data, wherein the initialization data comprises a point position matrix and a color value threshold matrix;
the data decoding unit is used for decoding the color data matrix image according to the color data matrix image generated by the encoding end and the initialization data acquired by the image acquisition unit so as to release data;
and the file restoring unit is used for carrying out file restoring operation on the bit stream data obtained by decoding by the data decoding unit.
In the invention, the display unit is a display screen, and the coding initialization unit and the data coding unit are integrated in the coding equipment of the host system of the transmitting end; the image acquisition unit is a camera, and the decoding initialization unit, the data decoding unit and the file restoring unit are integrated in decoding equipment of a host system at the receiving end.
The foregoing description is only a preferred embodiment of the present invention and is not intended to limit the invention in any way, but any simple modification, equivalent variation, etc. of the above embodiment according to the technical substance of the present invention falls within the scope of the present invention.

Claims (9)

1. The physical isolation data ferrying method based on the high-density color data matrix image is characterized by comprising the following steps of initializing an external network end and an internal network end, encoding external network end data and decoding internal network end data:
A. external network end and internal network end initialization
A.1. External network end initialization
S101, respectively displaying three initializing images, namely a dot matrix image, a pure black image and a pure white image by display equipment according to a set time interval;
A.2. intranet end initialization
S201, the image acquisition equipment shoots a dot matrix image, a pure black image and a pure white image which are played by the external network display equipment one by one, and firstly, a dynamic positioning algorithm is adopted to dynamically position the dot positions of the data matrix image according to the pure black image and the dot matrix image, so as to obtain a dot matrix PM;
s202, extracting a black color value matrix BM of a pure black image and a white color value matrix WM of a pure white image according to a point position matrix PM, and then calculating a color value threshold value matrix CM of the corresponding point position matrix of the image;
B. External network end data coding
S102, the encoding equipment reads the length of binary stream data of target data, and calculates the number of images which can be generated by the current target data according to the length of the binary stream data and the length value row and the width value col of the color data matrix image to be generated;
s103, dividing the binary stream data of the read target data into n bit streams with the length of row 'col' 3, and then respectively performing matrix operation on the n bit stream data with the length of row 'col' 3 to convert the bit stream data into a corresponding three-dimensional matrix M1 i (row，col，3)；
S104, converting the description information of the target data as packet header information into bit stream data, performing matrix operation, and converting the bit stream data into a three-dimensional matrix M2 i (2,col,3)；
S105, a data matrix M1 i Performing row exclusive-or and column exclusive-or operation, splicing the obtained row exclusive-or values, and converting the spliced row exclusive-or values into three-dimensional momentsArray M3 i (2, col, 3) sequentially concatenating the matrices M2 i 、M3 i M1 i The spliced data matrix is M4 i (row+4, col, 3) data matrix M4 i Storing the color data matrix image as a vector image, and finally forming a color data matrix image;
s106, the display equipment plays the generated color data matrix image;
C. intranet-side data decoding
S203, shooting a color data matrix image played by the display device by the image acquisition device, extracting the point positions of the shot image by the decoding device according to the point position matrix PM, acquiring a data matrix DM of the image shot by each frame of the image acquisition device, converting the data matrix DM into a (0, 1) data matrix DM 'to finish the numerical extraction work of each frame of data, and storing binary data of the matrix DM' obtained after conversion;
Step S204, the decoding equipment firstly acquires bit stream data related to a data storage data identifier in a matrix DM ', performs bit stream character string processing on the bit stream data, checks whether the data storage data identifier exists, directly discards the matrix if the data storage data identifier does not exist, performs row exclusive-OR and column exclusive-OR calculation on the data in the matrix DM', compares the obtained value with an original exclusive-OR value in the matrix DM ', stores the matrix DM' if the obtained value is the same as the original exclusive-OR value, and stores packet header information in the matrix as basic information in a redis list to be processed;
s205, the file restoring device reads basic information in the redis list, finds out a corresponding DM ' matrix according to the information, performs data splicing processing according to the sequence after reading bit streams of the DM ' matrix, and performs file restoring operation on bit stream data obtained by splicing after all DM ' matrix data of target data are spliced.
2. The method for ferrying physical isolation data based on high-density color data matrix image according to claim 1, wherein when the number of images that can be generated by calculating the target data is a fraction, the binary stream data of the target data is data-stuffed, and the stuffed data is bit (0).
3. The method for ferrying physical isolation data based on high-density color data matrix image according to claim 1, wherein the calculation expression of the number of the generated images of the calculation target data is n=l/(row×col×3), n is the number of the images, and L is the length of the binary data stream.
4. The method for data ferrying based on physical isolation of high-density color data matrix image according to claim 2, wherein the number of bits (0) filled in when data filling is a, a= (row 3) mod (L, (row 3)) and L is the binary data stream length.
5. The method of claim 1, wherein the description information of the target data includes a file name and size, i-th block bit stream data currently encoded, the number of file stuffing bits (0), a file creation time, and a data storage data identifier.
6. The method of claim 1, wherein the dynamic positioning algorithm comprises: (1) Reading matrix data MPP of the dot matrix image and matrix data BPP of the pure black image, and obtaining a new matrix MPP 'through MPP' =MPP-BPP; (2) Performing binarization processing on MPP', obtaining a first central point of an image, obtaining a second central point of the same line according to the first central point through a fixed value distance, and similarly obtaining all central points corresponding to the line; (3) Obtaining a second central point of the column according to the first central point by a fixed value distance, and obtaining all corresponding central points of the column by analogy; (4) The information of all the central points of the rows and columns is combined into a point matrix PM.
7. The method for physically isolating data ferrying based on high-density color data matrix image according to claim 6, wherein the method for converting the data matrix DM into the (0, 1) data matrix DM' is specifically as follows:
the data matrix DM is first converted into an intermediate matrix Q by the calculation of q=dm-CM, then the value smaller than 0 in the intermediate matrix Q is set to 0, and the value larger than 0 is set to 1, and finally a new data matrix DM' is generated.
8. A physically isolated data ferrying system based on a high-density color data matrix image, wherein the system is used for implementing the data ferrying method according to any one of claims 1-7, and comprises a transmitting end host system connected with a network a and a receiving end host system connected with a network B; the sending end host system is an external network coding end and is used for receiving data transmitted by the network A and coding the data, and playing and displaying the image after the corresponding image is generated by coding; the receiving end host system is an intranet decoding end and is used for collecting images displayed by the sending end host system, decoding the collected images to release data, and therefore unidirectional data ferrying among the physical isolation networks is completed.
9. The physically isolated data ferrying system based on high-density color data matrix image of claim 8, wherein the system comprises:
The code initialization unit is arranged in the transmitting end host system and is used for generating an initialization image according to a set time interval and transmitting the initialization image to the display unit;
the data coding unit is arranged in the sending end host system and is used for receiving the target data transmitted by the network A, coding the target data, generating a corresponding color data matrix image and transmitting the corresponding color data matrix image to the display unit;
the display unit is arranged in the sending end host system and is used for receiving the images transmitted by the coding initialization unit and the data coding unit and playing and displaying the images;
the image acquisition unit is arranged in the receiving end host system and is used for acquiring the image played and displayed by the display unit;
the decoding initialization unit is arranged in the receiving end host system and is used for acquiring an initialization image according to the image acquisition unit and generating initialization data;
the data decoding unit is arranged in the receiving end host system and used for decoding the color data matrix image according to the color data matrix image acquired by the image acquisition unit and the generated initialization data so as to release data;
the file restoring unit is arranged in the receiving end host system and is used for carrying out file restoring operation on the data obtained by decoding by the data decoding unit.
CN202311572111.5A 2023-11-23 2023-11-23 Physical isolation data ferrying method and system based on high-density color data matrix image Pending CN117579755A (en)

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