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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 , control printing quality, novel and practical structure

Active Publication Date: 2013-07-10
CHINA BANKNOTE SECURITY PRINTING TECH RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Examples

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Embodiment 1

[0040] This example utilizes as figure 1 The image-type infrared reflectance quantitative detection device shown in the figure detects the infrared pairing code information. The device is a closed structure including an aluminum alloy shell that has been blackened, not shown, and includes a An infrared camera 1 and an infrared light source 2, the infrared light source 2 adopts a 940nm infrared LED array structure, and the reflectance calibration card 5 is 8 small discs whose infrared reflectivity is distributed in 10%-90% and as image 3 The distribution shown is around the analyte.

[0041] The U.S. dollar uses infrared paired inks (absorbent ink and reflective ink) to attach infrared coded information on the face of the bill, such as Figure 5 shown. The coded information can be used for anti-counterfeiting identification, and can also be used for machine-readable identification.

[0042]Using the reflectance quantitative detection device described in the patent of the pr...

Embodiment 2

[0051] This example utilizes as figure 2 The image-type infrared transmittance quantitative detection device shown detects the euro infrared pair code information. The device is a closed structure including an aluminum alloy shell that has been blackened, not shown. An infrared camera 1 and an infrared light source 2, the infrared light source 2 adopts such as Figure 4 As shown in the planar 940nm infrared LED array structure, the reflectivity calibration card 5 is 8 small discs with infrared reflectivity distributed in 10%-90% and as shown in image 3 The distribution shown is around the analyte.

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

[0053] Using the transmittance quantitative detection device described in the patent of the present invention, the infrared transmittance at any position of the watermark area on the euro bill ...

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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 anti-counterfeiting printing of valuable securities, in particular to online or offline detection of infrared ink and white watermark machine-readable features, in particular to an image-type infrared reflectance and transmittance quantitative detection device and method. 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 banknote sorting machines, ATM machines, etc. of various types are equipped with infrared detection modules. Infrared ink with infrared characteristics has a wide range of applications, and can be used in pairs besides being used alone, and has high anti-counterfeiting value. [0003] Because of its unique technology, white watermarking integrates complex processes such as design, engraving, net making, and papermak...

Claims

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Application Information

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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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