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Encoding and decoding method of spectrum two-dimensional code

A decoding method and two-dimensional code technology, applied in electromagnetic radiation induction, instruments, inductive record carriers, etc., can solve problems such as the inability to fundamentally improve the information capacity of the two-dimensional code, potential safety hazards, and the size limit of the two-dimensional code, and achieve Improve the amount of information storage, improve security and reliability, and ensure the effect of user privacy

Active Publication Date: 2016-10-12
NANJING UNIV 5D TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The size of the information capacity of the two-dimensional code depends on the physical size of the two-dimensional code and the resolution capability of the scanning device. In theory, the information capacity of the two-dimensional code can reach infinity, but considering the actual application scenario, the size of the two-dimensional code is limited. At present, the mainstream methods of increasing the information capacity of QR codes are: reducing the pixel size of QR codes, increasing the number of pixels of QR codes, changing the encoding method to improve encoding efficiency, storing short URLs pointing to information stored in the cloud, etc. However, these methods It cannot fundamentally improve the information capacity of the QR code
This kind of two-dimensional code technology has certain security risks as an information transmission medium, especially for fields involving user information security, such as property security, personal private information, etc.
In addition, although the current traditional two-dimensional code technology itself has a certain security and anti-counterfeiting performance, the method used is only a simple XOR method, which cannot be regarded as a strict security and anti-counterfeiting technology.

Method used

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  • Encoding and decoding method of spectrum two-dimensional code
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  • Encoding and decoding method of spectrum two-dimensional code

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Encoding and decoding of spectral two-dimensional code based on quantum dot technology

[0052] Quantum dots are composed of a limited number of atoms, and the three dimensions are all on the order of nanometers. Quantum dots can emit fluorescence after being excited, and the emission spectrum is narrow and symmetrical, and the color can be adjusted. Its fluorescence luminescence technology can be used to prepare spectral two-dimensional codes; at the same time, quantum dots can also emit light through electrical excitation. Diodes can also be used to generate spectral QR codes.

[0053] First design the spectral encoding vector according to the encoding requirements

[0054] Encode the vector according to the spectrum The wavelength information of quantum dots can be adjusted to adjust the size and chemical composition of quantum dots, thereby changing the emission spectrum of quantum dots. Taking InP quantum dots as an example, the emission spectrum and particle...

Embodiment 2

[0060] Amplitude spectral codec

[0061] Taking InP quantum dots as an example, the spectral encoding vector length N=6.

[0062] coding stage

[0063] The first step is to set the encoding information and normalize the encoding information. The encoding information f is an encoding vector with a relative value, such as f=[7, 4, 2, 5, 0, 3]; since in the decoding stage, the shooting distance Factors such as angle and angle will affect the absolute value of the spectrum obtained by the decoding equipment. Therefore, it is necessary to set normalized encoding information in the encoding stage. In this embodiment, the third bit is used as the standard value, and the normalized encoding information

[0064] In the second step, the conversion function H adopts a proportional function with a coefficient of 1, namely The emission spectrum of each band is as Figure 8 Shown by the dotted line in;

[0065] In the third step, the conversion function H is calibrated. Due to the ov...

Embodiment 3

[0072] Spectrum encoded information f encryption

[0073] Taking InP quantum dots as an example, the spectral encoding vector length N=6.

[0074] Encoding stage:

[0075]The first step is to establish a lookup table for the correspondence between the encryption algorithm E and the code, for example, 1 represents the DES algorithm, 2 represents the DSA algorithm, 3 represents the IDEA algorithm, 4 represents only fixed bit encoding, etc.;

[0076] Second step, select encryption algorithm, design encryption algorithm correspondence code is 4 in this embodiment, i.e. f (1)=4;

[0077] The third step is to encrypt the plaintext P according to the selected encryption algorithm E to generate ciphertext C, and assign it to the encoded information f. According to the requirements of the encryption algorithm, the fixed bit (such as the third bit) of the encoding vector is encoded, i.e. f(3)=data, and the values ​​of the remaining bits are random values, i.e. f(2 / 4 / 5)=randam, the enc...

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Abstract

The invention discloses an encoding and decoding method of a spectrum two-dimensional code, integrating a spectrum encoding technology with a two-dimensional code technology. In the method, the concrete encoding process of the spectrum two-dimensional code is as follows: 1, writing figure encoding information into a figure of a two-dimensional code, writing spectrum encoding information into figure units of the two-dimensional code, wherein each figure unit is composed of 1*N one-dimensional spectrum vectors and comprises N-bit spectrum encoding information; and 2, according to the encoding information, by use of a spectrum two-dimensional code generator, performing spectrum vector encoding on each figure unit, then performing figure encoding on a pattern of the two-dimensional code, and finally generating the spectrum two-dimensional code. According to the invention, information channels of spectrum dimensions are increased by use of the spectrum encoding technology, the information storage capacity of the two-dimensional code is further improved, the storage capacity is 2<N-1> times that of a conventional two-dimensional code technology, and the problem of low storage information content of a conventional two-dimensional code is solved.

Description

technical field [0001] The invention integrates spectral coding technology and two-dimensional code technology, and relates to a novel coding and decoding method of spectral two-dimensional code. Background technique [0002] Two-dimensional code is to record data symbol information with a specific geometric figure distributed in the plane (two-dimensional direction) according to certain rules; "0", " 1” The concept of bit stream uses several geometric shapes corresponding to binary to represent text and numerical information, and automatically reads through image input equipment or photoelectric scanning equipment to realize automatic processing of information. [0003] The size of the information capacity of the two-dimensional code depends on the physical size of the two-dimensional code and the resolution capability of the scanning device. In theory, the information capacity of the two-dimensional code can reach infinity, but considering the actual application scenario, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/14
CPCG06K7/1417G06K7/146
Inventor 丁健文李想闫锋朱曦潘巍松
Owner NANJING UNIV 5D TECH