Recognition device and method for fold of paper currency

Abstract

The invention relates to a recognition device and a recognition method for the fold of a paper currency. The recognition device for the fold of the paper currency comprises a laser light source, a rectangular raster, an area array photoelectric sensor, an imaging lens assembly and a signal processing module, wherein the laser light source is used for giving out laser light rays, the rectangular raster is located above the laser light source and is used for modulating the laser light rays into stripes which are changed to be bright or dark in accordance with the regular rules on the surface of the paper currency, and the area array photoelectric sensor is used for acquiring images; the imaging lens assembly is located above the area array photoelectric sensor and is used for gathering an image of the surface of the paper currency on the area array photoelectric sensor, and the signal processing module is electrically connected with the area array photoelectric sensor and is used for processing image signals. According to the recognition method for the fold of the paper currency realized by the device is used for converting the inspection whether any fold exists into the inspection whether the feature images of the raster stripes are bent, therefore the influence on the fold of the paper currency caused by a color shift phenomenon due to the change of a grey level of the image acquired of the paper currency at different temperatures can be effectively prevented, and the recognition on the fold of the paper currency can be improved.

Description

technical field [0001] The invention relates to a non-contact optical detection technology, in particular to a paper money wrinkle recognition device and method. Background technique [0002] my country is a country with a large population, and the circulation of cash is huge. According to the statistics of the People's Bank of China: As of the first quarter of 2014, the total amount of currency in circulation in China reached 6.7 trillion yuan. Damaged banknotes in circulation account for a large proportion, and it is quite difficult for all banks to deal with banknotes, such as ordering, pickiness, and division of editions. In order to improve the cleanliness of RMB in circulation and maintain the reputation of RMB, the People's Bank of China has formulated the "Critical Criteria for Renminbi Unsuitable for Circulation", in which banknotes with obvious wrinkles or deformations are one of the situations of RMB that are not suitable for circulation. Therefore, it is necess...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the contact image sensor has a certain temperature characteristic in the prior art, which seriously affects the recognition of banknote wrinkles, the present invention provides a banknote wrinkle recognition device, which adopts a new image acquisition method to improve the recognition rate of banknote wrinkles

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