A colorless phosphorescence printing pattern quality online detection method and device
The technology of a detection device and detection method is applied to the authenticity inspection of banknotes, instruments, and the processing of coins or valuable banknotes, etc., which can solve the problems of low detection efficiency, large errors, and unreliable detection results, etc.
Active Publication Date: 2020-05-15
NANCHANG BANKNOTE PRINTING
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[0004] In the prior art, when detecting the colorless phosphorescence printing pattern, the method of visual observation is generally adopted. However, since the colorless phosphorescence is invisible under visible light, it needs to be observed under the irradiation condition of an ultraviolet lamp, which leads to detection The efficiency is low, the error is large, and the detection results are unreliable. At the same time, in the process of mass production, large sheets of securities (including several small sheets of securities arranged vertically and horizontally) are usually printed. Every sheet of product in a portfolio is inspected
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[0061] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Several embodiments of the invention are shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.
[0062] It should be noted that when an element is referred to as being “fixed on” another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only.
[0063] Unless otherwise def...
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Abstract
The invention provides an online detection method and device of colorless phosphorescence printing pattern quality. The method comprise steps of acquiring a phosphorescence reflection image of each opposite small piece of product shot by a camera in real time under the irradiation of an ultraviolet light source; according to a preset image dividing mode, dividing any current phosphorescence reflection image into multiple to-be-detected image regions and carrying out out-of-tolerance analysis on a template region corresponding to each to-be-detected image region in a template image so as to obtain an out-of-tolerance state value of each to-be-detected image region; and according to the out-of-tolerance state value of each to-be-detected image region, evaluating the printing pattern quality of a target small piece of product corresponding to the current phosphorescence reflection image. According to the invention, checking of each small piece of product in a large piece of phosphorescence printing product can be achieved and the detection result is highly reliable.
Description
technical field [0001] The invention relates to an online detection method and device for colorless phosphorescence printing pattern quality. Background technique [0002] Colorless phosphorescent compounds can be added to absorbent printing inks or transparent carriers and are invisible on prints under natural light unless excited by ultraviolet light. Due to the luminous properties of colorless phosphorescent materials under ultraviolet irradiation, currently colorless phosphorescent materials are widely printed in patterns of securities (such as banknotes) to play a certain role in anti-counterfeiting. [0003] At present, in the printing process of securities, due to various error factors, the colorless phosphorescent printing patterns printed on securities are different. Therefore, after the printing of securities, it is usually necessary to The printed colorless phosphorescence printing pattern is tested to determine whether it is qualified for printing. [0004] In ...
Claims
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IPC IPC(8): G07D7/12G07D7/206
CPCG07D7/128
Inventor 吴晓明王伟翟志万万国
Owner NANCHANG BANKNOTE PRINTING