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Nano-particle fluorescence spatial coding anti-fake identification method

A technology of spatial coding and anti-counterfeiting marking, which is applied in the field of anti-counterfeiting marking of nanoparticle fluorescence image spatial coding, can solve the problems of low anti-counterfeiting and easy imitation, and achieve high anti-counterfeiting, not easy to fade, and good adsorption

Pending Publication Date: 2017-03-29
SHANGHAI LANGYAN OPTOELECTRONICS TECH +1
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Problems solved by technology

However, this anti-counterfeiting process is limited to encrypting the up-conversion material. Once the type of up-conversion material is identified, it is very easy to imitate, so the degree of anti-counterfeiting is not high

Method used

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  • Nano-particle fluorescence spatial coding anti-fake identification method
  • Nano-particle fluorescence spatial coding anti-fake identification method
  • Nano-particle fluorescence spatial coding anti-fake identification method

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Embodiment Construction

[0044] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0045] The purpose of the present invention is to make patterns of random distribution of nanoparticles, and propose a nanoparticle fluorescence space coding anti-counterfeiting marking method by encoding the intensity and spatial information of the nanoparticle fluorescence patterns.

[0046] The method provided in this embodiment uses the laser ablation method to prepare nanometer-sized rare earth materials in a liquid. Due to the up-conversion effect and random distribution characteristics of na...

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Abstract

The invention relates to a nano-particle fluorescence spatial coding anti-fake identification method. The method includes the following steps that: S1, fluorescence nano-particles are prepared; S2, the fluorescence nano-particles are adopted to make an anti-fake pattern; S3, the anti-fake pattern is irradiated by light, and an anti-fake model is built; and S4, a picture to be authenticated is processed in the same manner with the step S3, and fluorescence intensity and spatial distribution characteristic information are extracted, and similarity measurement is carried out through using the anti-fake model, so that authenticity of the picture can be determined. According to the method of the invention, the anti-fake pattern is unique, the distribution of the nanoparticles has random uncontrollability, and therefore, it is impossible to produce the same fluorescence distribution pattern, and thus, compared with the prior art, the method has high anti-fake degree.

Description

technical field [0001] The invention relates to the technical fields of optical and computer image recognition and anti-counterfeiting, and relates to an anti-counterfeiting marking method for spatial encoding of nanoparticle fluorescence images. Background technique [0002] Nanoparticles refer to materials with particle sizes ranging from 1 to 100 nm. Nanoparticles have particularity in terms of energy level structure, energy transfer, and spectral properties. The fluorescent materials prepared with them have the characteristics of high brightness, good stability, strong adsorption capacity, difficult diffusion, deformation, and no fading under high temperature. It is used in the fields of luminescence, display, biomarkers, etc. Taking rare earth luminescent materials as an example, up-conversion luminescence refers to the process of converting long-wave radiation into short-wave radiation through a multi-photon mechanism. Under the excitation of 980nm infrared light, it ...

Claims

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Application Information

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IPC IPC(8): G06T7/13G06T7/11G06T7/187G06Q30/00
CPCG06Q30/0185
Inventor 曾和平李敏
Owner SHANGHAI LANGYAN OPTOELECTRONICS TECH
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