Character altering detection method and device, equipment and medium

Abstract

The invention discloses a character correction detection method, which comprises the following steps: acquiring an ultraviolet fluorescence image of a bill to be detected, and acquiring a target detection area of the bill to be detected; obtaining a target channel image corresponding to the ultraviolet fluorescence image, obtaining a single character region corresponding to each character to be detected in the target channel image, and obtaining a pixel gray value of each pixel point in each single character region; obtaining a gray value threshold value, and calculating the number of dark spots in each single character region according to the gray value threshold value and the pixel gray value; and judging whether the to-be-detected bill is altered or not according to the dark spot number of the dark spots in each single character area. The characteristic that the altered part has brightness difference in the channel image corresponding to the ultraviolet fluorescence image is applied, and whether the character is altered or not can be accurately detected. In addition, the invention further provides a character correction detection device and equipment and a storage medium.

Description

technical field [0001] The invention relates to the technical field of bill detection, in particular to a character alteration detection method, device, equipment and medium. Background technique [0002] The forms of bills include bills of exchange, cashier's checks and checks, etc., and bills have important value significance. And some offenders attempt to illegally use the bill by altering the bill, so it is very important to detect whether the bill is altered or not. The most common alteration of bills is to alter the ticket number. There are three main forms of ticket number alteration, including black handwriting alteration, fluorescent handwriting alteration and ordinary red handwriting alteration. Because the color of the ticket number itself is red, there are color differences visible to the naked eye in the black altered handwriting in the visible light map and the infrared light map, so it can be done through many methods (such as color, brightness, or black hand...

AI Technical Summary

Problems solved by technology

The red altered handwriting is less different from the color of the ticket number itself, and it is difficult to find the difference in the altered part in a single visible light image, infrared light image, and UV fluorescence image, so a special solution is needed to solve this problem. a question

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