Pasting foreign matter detection method of slice type medium and device thereof

Abstract

The invention discloses a pasting foreign matter detection method of a slice type medium. The method includes steps: obtaining voltage data of a to-be-detected slice type medium by employing a Hall element; obtaining thickness data of the to-be-detected slice type medium according to the voltage data and a voltage thickness conversion formula; calculating a thickness average value of the to-be-detected slice type medium according to the thickness data; regarding points whose thickness is greater than a preset normal thickness threshold on a plane which the to-be-detected slice type medium is located on as abnormal points, and calculating an abnormal region area of the to-be-detected slice type medium according to multiple continuous abnormal points; calculating an error between the thickness of the abnormal points in the abnormal region area and the thickness average value, and calculating a foreign matter index according to the abnormal region area and the error; and determining the slice type medium has a foreign matter if the foreign matter index is greater than a preset anomaly threshold. By adopting the method, whether the medium has the foreign matter can be accurately inspected, and the measuring precision is improved.

Description

technical field [0001] The invention relates to the technical field of thickness detection, in particular to a method and a device for detecting pasted foreign objects of sheet media. Background technique [0002] With the development of my country's economy and the improvement of its international status, the circulation of RMB banknotes and the circulation at home and abroad continue to increase. During the circulation of banknotes, damage will inevitably occur. People will paste adhesive tapes and other attachments on banknotes, and such damage Heavy banknotes with attached attachments should be withdrawn from market circulation according to the requirements of the People's Bank of China; currently, sheet-type valuable documents are generally made of special materials and have certain thickness characteristics. It can identify the tape and folded corners pasted on banknotes, so as to reject unqualified banknotes. However, the existing detection equipment generally uses ult...

AI Technical Summary

Problems solved by technology

However, the existing detection equipment generally uses ultrasonic sensors to detect the thickness. This method has low measurement accuracy and cannot accurately detect foreign objects.

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