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The cutting edge of anti-counterfeit ---dimensional layout sensor combination of bill couter

Currencies has undergone continuous development and iteration worldwide. As their anticounterfeiting capabilities get stronger and stronger, the technical methods used by counterfeiters has been

improved at the time; some can even directly suppress the bumpy feeling of the real banknotes.


2021/10/13
The cutting edge of anti-counterfeit ---dimensional layout sensor combination of bill counter



Currencies has undergone continuous development and iteration worldwide. As their anti-counterfeiting capabilities get stronger and stronger, the technical methods used by counterfeiters has been improved at the time; some can even directly suppress the bumpy feeling of the real banknotes. In order to improve the anti-counterfeiting ability of our bill counter, our Research and Development Team constantly upgrades software and hardware system. The most important is the upgrade of the sensor.


Sensors are a crucial part of money counting machine. Let us look at different types of sensors.


The first type of sensor is a UV fluorescence sensor. As the name implies, it uses UV fluorescence reaction to distinguish counterfeit bills. Lower-level counterfeit banknotes are simply made of color printed A4 or bleached paper. One characteristic of this type of paper is that their UV fluorescence reaction is particularly strong. Authentic US banknotes are not printed on paper but are structured by various fibers and different materials. As a result, a real banknote has no UV fluorescence reaction. This is a way we use to distinguish counterfeit bills by the UV fluorescence reaction on paper. If there is a strong reaction, it must be counterfeitand our money counting machine can detect.






Now with fluorescence sensors are out first line of defense, magnetic sensors are our second. Since the original version of the US dollars, the amount of magnetic ink has been added in the banknotes to form a three-dimensional distribution of magnetic ink. The magnetic sensor in our bill counter detects these distributions. It examines whether a fixed area on the banknote is magnetic, and whether the magnetic energy meets our level of requirement. If an answer is no, the banknote will be marked as a counterfeit bill. Magnetic detection is an essential method for capturing counterfeit bills of US banknotes and it is the most commonly used method in the market.


Our third line of counterfeit defense is the infrared detection of Contact Image Sensor in money counting machine. In its early stage, CIS existed in the form of a single infrared tube. After continuous improvements, a line was formed by combining many infrared tubes into a matrix distribution. Current CIS are arranged with a total of 1,440 receivers to achieve stereo imaging of a banknote.
The mechanism of CIS is similar to that of infrared pair tube. They both use a variety of spectra to detect the distribution of features on a banknote. We use the infrared characteristics of the real banknote as a template to compare. For example, if we detect an infrared response on a certain area on a real banknote, but not on the same area on another bill, we could then determine the other
banknote to be counterfeit. This is the detection method using infrared features.

Our fourth level of counterfeit defense is the use of RGB characteristics on our existing CIS sensors, which is, the use of red light, blue light and green light images. We can make some partial judgements on the banknotes based on these three images to determine whether they are counterfeit. In authentic US dollars, there is a certain proportional relationship among the distribution of the RGB colors. However, when printing counterfeit bills, the distribution proportion of red, green and blue colors may not be analyzed to the same ratio of normal banknotes. This results in a
difference in characteristics in the final products.Especially in the area of the serial, the difference cannot be seen by naked eyes, but the difference  in ratio of the three colors can be obvious when
we extract RGB color images. We use this feature to distinguish counterfeit banknotes, which is the use of its colored light.





These four levels of anti-counterfeiting technology are the core of our bill counter. These sensors form a stereo layout inside our machine to make a comprehensive analyze of each banknote. Counterfeiting technologies are constantly updating, so are our detecting methods. We never stop. By now,all these technologies have been fully equipped on our money counting machine:






A UV fluorescence sensor inside our bill counter

UV Fluorescence reaction of a counterfeit banknote

UV Fluorescence reaction of a real banknote

Magnetic ink distribution on a real banknote

Magnetic sensors inside our money counting machine

A CIS sensor inside our machine

Image extracted by CIS sensor on a real banknote

Image extracted by CIS sensor on a counterfeit banknote




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