Paper money or bill authenticity identification method

Abstract

The invention discloses a counterfeit identification method for banknotes or bills, which comprises: respectively setting an incident light source and a total reflection prism on both sides of the banknote delivery channel between the banknote output port and the banknote input port; The area to be detected in the banknote channel is obliquely above, and the area to be detected is irradiated at a preset inclination angle; a photoelectric receiver is located directly above the area to be detected in the banknote delivery channel; the total reflection prism is located on the The incident light source is between the reflected light path on the area to be detected and the incident light path of the photoelectric receiver; a photoelectric signal amplification circuit is set to be connected with the photoelectric receiver of the electric receiver; a signal comparison circuit is set with the photoelectric receiver The signal amplification circuit is connected. Compared with the continuous attenuation of the multiple reflection and refraction energy of the flat mirror, the use of the total reflection prism, all the light energy is reflected from the prism, and a more ideal image will be obtained under the same lighting conditions.

Description

technical field [0001] The invention relates to the technical field of image processing and recognition, in particular to a counterfeit detection method for banknotes or bills. Background technique [0002] With the continuous development of the national economy, the volume of RMB cash transactions continues to increase. Paper money is the main currency of RMB issued by my country and plays a very important role in economic activities. There have always been criminals manufacturing and circulating counterfeit money and alterations This seriously disrupts the financial order and economic stability, and damages the public interest of the country. [0003] In order to improve the orientation ability of banknotes, anti-counterfeiting technologies such as paper anti-counterfeiting, ink anti-counterfeiting and printing anti-counterfeiting have been continuously developed and improved. In recent years, with the continuous development of anti-counterfeiting technology, the production...

AI Technical Summary

Problems solved by technology

Therefore, the inevitable problems in the detection of discoloration characteristics are many problems such as large number of hardware devices, high system cost, complex hardware circuit drive, complex mechanical structure, complex equipment installation and debugging, and difficulty in productization of prototypes.

In this case, many problems such as complex system structure and difficult debugging will inevitably appear.

[0006] The patent application number is 2007101663473, and the name is "multi-angle optical feature automatic detection device". By introducing a mirror, the optical environment of the detection area is changed. It achieves the purpose of observing the optical characteristics of two different angles in the same field of view, but the general plane mirror is made of silver plating on the back surface of the glass, because the reflection effect of the plane mirror depends on the effect of the manufacturer's silver plating, and the silver plating is Imaging inconsistencies due to easy detachment; see figure 2 , Schematic diagram of the optical path of the ghost image reflected by the plane mirror multiple times, where S is the object, S1 is the main image of the object, and S2 / S3 are other reflected images

The front surface of the plane mirror, that is, the glass surface, also reflects light. The light has to be reflected multiple times by the glass surface and the silver surface, so it will form multiple images, forming overlapping images, which affects the processing of the image judgment module.

Among them, the image formed by the first reflection by the silver surface (the main image) is the brightest, while the other images are getting darker and darker. Although it is generally not noticeable, for precision optical instruments, such as cameras, telescopes, microscopes, etc. In the equipment, these redundant images must be removed. For today's increasingly high level of counterfeiting, the principle errors caused by the defects of the optical system itself must also be removed in order to achieve the optimum system, thus laying a good foundation for product design and counterfeiting. Base

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