Image-type device and method for quantitative determination of infrared reflectivity and transmissivity

A quantitative detection method, infrared transmittance technology, applied in the direction of transmittance measurement, measuring devices, instruments, etc., can solve the problems of inconvenient detection, cumbersome operation, complex optical path of spectroscopic measuring instrument, etc., and achieve convenient and rapid quantitative detection , The structure is novel and practical, and the effect of controlling the printing quality

Active Publication Date: 2015-04-01
CHINA BANKNOTE SECURITY PRINTING TECH RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, for the quantitative detection of the reflectance of infrared ink prints and the transmittance of white watermarks, the current detection methods have two shortcomings
First of all, the spectral response range of general detectors is limited, which cannot satisfy the measurement of infrared reflectance and transmittance; while the optical path of spectroscopic measuring instruments is complicated, the operation is cumbersome, and it is very inconvenient to complete the detection; secondly, the detection method is usually a static test. It is difficult to perform dynamic detection, and basically cannot meet the requirements of batch automatic testing in automation equipment

Method used

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  • Image-type device and method for quantitative determination of infrared reflectivity and transmissivity
  • Image-type device and method for quantitative determination of infrared reflectivity and transmissivity
  • Image-type device and method for quantitative determination of infrared reflectivity and transmissivity

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Embodiment 1

[0040] This embodiment uses the figure 1 The shown image-type infrared reflectance quantitative detection device detects the US dollar infrared paired coded information, the device is a closed structure including an unshown blackened aluminum alloy shell, and the interior includes a Infrared camera 1 and infrared light source 2, the infrared light source 2 adopts a 940nm infrared LED array structure, and the reflectivity calibration card 5 is 8 small discs with infrared reflectivity distributed at 10%-90% and as shown in Fig. image 3 The distribution shown is around the object to be detected.

[0041] Dollars use infrared paired inks (absorbing and reflecting inks) with infrared-coded information attached to the ticket, such as Figure 5 shown. The encoded information can be used for anti-counterfeiting identification and machine-readable identification.

[0042]Using the reflectivity quantitative detection device described in the patent of the present invention, the infra...

Embodiment 2

[0051] This embodiment uses the figure 2 The shown image-type infrared transmittance quantitative detection device detects the Euro-infrared paired coded information, the device is a closed structure including an unshown blackened aluminum alloy casing, and the interior includes two sides located on both sides of the detected object. Infrared camera 1 and infrared light source 2, the infrared light source 2 adopts such as Figure 4 The flat 940nm infrared LED array structure shown, the reflectivity calibration card 5 is 8 small discs with infrared reflectivity distributed at 10%-90% and as shown in Fig. image 3 The distribution shown is around the object to be detected.

[0052] The Euro uses the white watermark coding technology to print the bar code information on the banknotes, which improves the anti-counterfeiting and machine readability, such as Image 6 shown.

[0053] Using the transmittance quantitative detection device described in the patent of the present inve...

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Abstract

The invention provides an image-type device and a method for quantitative determination of infrared reflectivity and transmissivity. The method comprises firstly calibrating the reflectivity and the transmissivity of calibration cards with a plurality of different reflectivity or transmissivity, secondly collecting reflected and transmitted images of the calibration cards and to-be-detected objects under illumination of infrared LED light sources, and performing linearity interpolation in accordance with the reflectivity values and the transmissivity values of the calibration cards to obtain the reflectivity values and the transmissivity values of the to-be-detected objects at any positions in an imaging area, thereby realizing the quantitative determination of the reflectivity and the transmissivity. According to the invention, the above detection can be carried out for prints printed with infrared ink or white watermark, and thus printing quality can be effectively controlled. The method and the device are convenient and fast, flexible in function, and strong in expansibility, and can adjust optical devices and software configuration of host computers for different applications, thereby achieving detection requirements.

Description

technical field [0001] The invention relates to the field of securities anti-counterfeiting printing, in particular to online or offline detection of machine-readable characteristics of infrared ink and white watermark, in particular to a device and method for quantitative detection of image-based infrared reflectivity and transmittance. Background technique [0002] Infrared anti-counterfeiting feature is a relatively advanced anti-counterfeiting technology at present, with obvious anti-counterfeiting effect, good concealment and machine readability. At present, most bank instruments such as various types of banknote sorting machines and ATM machines are equipped with infrared detection modules. Infrared ink with infrared characteristics has a wide range of applications, and can also be used in pairs in addition to being used alone, and has high anti-counterfeiting value. [0003] White watermarking is also a commonly used and effective anti-counterfeiting technology becau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/17G01N21/59
Inventor 卢继兵张健秦庆旺冯治国邬立勇张渠刘李泉张晓明冯礼
Owner CHINA BANKNOTE SECURITY PRINTING TECH RES INST CO LTD
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