Counterfeit detecting device for paper money

Abstract

The invention discloses a counterfeit detecting device for paper money. The counterfeit detecting device comprises a total reflection prism. The total reflection prism and a light source are arranged on two sides of a paper money conveying channel. When the paper money conveying channel conveys the paper money, the total reflection prism receives reflection light generated by projection of the light source on the paper money and reflects an image of the paper money onto a camera. The camera collects an image of at least one anti-counterfeit characteristic on the paper money and an image of at least one anti-counterfeit characteristic on the total reflection prism. A judging module conducts identification and analysis and color identification to determine identity of the paper money according to two characteristic patterns of one frame of image. Compared with a plane mirror which enables energy to be attenuated continuously after multiple times of reflection and refraction, the total reflection prism enables all light energy to be reflected out from the prism, and under the same light condition, a more ideal image picture is obtained.

Description

Technical field [0001] The invention involves the field of image processing and identification technology, and specifically involves a pseudo -testing device for banknote. Background technique [0002] One way to learn from the field of financial machinery is color -based banknotes.In the traditional money -order machine, the detection of color characteristics in the scales image detection machine is usually based on CMOS / CIS / CCD reflection imaging method. After collecting color images, it is detected by the image processing.use.The anti -counterfeiting point in the anti -counterfeiting feature has a strong anti -counterfeiting capacity, that is, the feature points observe different colors at different angles;Therefore, a traditional and very natural way is to place CMOS / CIS / CCD or other graphic equipment at different angles, and then collect images synchronously to extract and analyze the collected image color features in the system to achieve pseudo -pseudoeffect.Therefore, whe...

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.

[0004] 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 (main image) formed by the first reflection by the silver surface is the brightest, while the other images are getting darker and darker. Although it is generally not noticeable, it can be used 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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