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Method for qualitatively evaluating material

A technology for printing materials and characteristics, applied in the field of qualitative determination of materials, can solve the problems of distinguishing, identifying, and identifying marks that are not sufficiently reliable, and achieve the effect of avoiding interference

Inactive Publication Date: 2006-08-23
KOENIG & BAUER AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The disadvantage of this known method is that the identification marks cannot be recognized with sufficient reliability by the evaluation device, since their image properties cannot be sufficiently distinguished from other printed images, such as colored window lines, after capture with the photoelectric sensor this is the case

Method used

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  • Method for qualitatively evaluating material
  • Method for qualitatively evaluating material
  • Method for qualitatively evaluating material

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0047] When inspecting the prints printed with banknotes, the formation of figure 1 The difference image shown, where figure 1 Only a partial portion of the differential image within the area of ​​the banknote is shown. exist figure 1 It can be seen in the difference image 01 that the normal printed image of the banknote is concealed and only those areas of the printed image that are clearly distinguished from the background reference parameters form dark regions. The position of the window line 03 embedded in the print can be varied within a band-shaped expected range 02 indicated by a dotted line, said window line 01 forming five dark areas 03 in the difference image 01 according to band segments.

[0048] In addition to the five dark areas 03 formed by the imaging of the window opening 03 , further printed image features are formed in the differential image 01 as dark areas 04 , for example as printing defects 04 .

[0049] figure 2 It is the difference image after cor...

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PUM

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Abstract

A method for qualitatively evaluating material with at least one identification characteristic, whose position can vary within an expectation range designated by tolerance limits, involves the use of at least one illuminating device, at least one photoelectric sensor and an evaluating device. At least one background reference value and at least one mask reference are stored in the evaluating device. The background reference represents the characteristics of a printed image, particularly the gray scale value, in at least one portion which surrounds the identification characteristic. The mask reference represents the geometrical contour of the identification characteristic. During inspection of the printed material, differential image data is found, at least from the expectation range, from the actual image data, and from the background reference value in the evaluating device. The actual position of the identification characteristic is subsequently derived in the evaluating device.

Description

technical field [0001] The invention relates to a method for qualitative determination of materials. Background technique [0002] A method is disclosed, for example, in DE 196 13 082 C2. When adopting this method, printing materials, such as printing with banknotes or valuable securities, have window lines, holographic anti-counterfeiting (Hologram) or Kinegram-anti-counterfeiting, and an illuminating device is used for lighting, so that the light reflected by the printed material falls on the on the photoelectric sensor. The image captured by the photoelectric sensor is then evaluated and checked for printing defects in an evaluation device, for example a standard computer with corresponding software. [0003] In banknotes in particular, but also in other kinds of printed materials, variations in the position of the identification marks can occur within an expected range determined by specific tolerance limits based on a preset processing technology. For example, the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/64G07D7/00G06T7/00G06T7/60G06T7/73G06V10/20G06V10/28G07D7/20
CPCG06T7/0044G06K9/36G06K9/38G07D7/20G06T7/74G07D7/206G06V10/20G06V10/28
Inventor 约恩·舍尔哈拉尔德·海因利希·维勒克
Owner KOENIG & BAUER AG