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Retroreflective articles having a machine-readable code

A retro-reflection, product technology, applied to record carriers, instruments, electromagnetic radiation induction used in machines, etc., can solve problems such as difficult to handle variable lighting, reduced accuracy of ALPR systems, and difficult to distinguish labels

Inactive Publication Date: 2015-04-29
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing systems struggle to distinguish labels from complex backgrounds and handle variable lighting
Also, the accuracy of the ALPR system drops when license plates become blurred or dirty

Method used

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  • Retroreflective articles having a machine-readable code
  • Retroreflective articles having a machine-readable code
  • Retroreflective articles having a machine-readable code

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0089] preparation Figure 1 to Figure 5 Retroreflective article shown: A roll of white reflective sheeting (i.e., retroreflective substrate) 40 (available from 3M Company, St. Material Series 4790 (Preclear Reflective License Plate Sheeting Series 4790)" commercially available). UV inkjet printer (model "JF-1631", commercially available from Mimaki USA, Suwanee, GA) and clear opaque, infrared transparent, cyan, magenta and yellow (CMY) ink (commercially available from 3M Company under the trade designation "Mimaki UV Piezo Inkjet Ink Series F-200") was printed on the front side of a 15 cm x 31 cm sample of reflective sheeting. Numerical characters 66 and background graphics 68 . Background graphic 68 is a wooded lake view with the words "ExploreMinnesota.com" 62 printed in blue throughout the upper portion of the retroreflective sheeting, and the words "JAN" 63 printed in blue throughout the lower portion of the retroreflective sheeting and "10,000 Lakes"64. In the approx...

example 2

[0094] preparation Figure 6 to Figure 9 Retroreflective article 100 shown: Printed retroreflective sheeting was prepared as described in Example 1, except: (1) the alphanumeric characters "SAM 123" 166 were printed using CMY ink; and (2) the embedded machine could Read information 180 is prepared by using a distinctly opaque, infrared absorbing (e.g., infrared opaque), black ink (available from 3M Company under the trade name "Mimaki UV High Pressure Inkjet Series F-200 (Mimaki UV Piezo Inkjet Ink Series F-200)" commercially available) to print some alphanumeric characters. A "Clear Protective Film 9097" film was laminated over the printed sheet to provide the retroreflective article 100 with machine readable information 180 embedded therein. Portions of the alphanumeric characters of the embedded machine-readable information completely overlap portions of the "SAM 123" characters 166 .

[0095] Image 6 is a digital photograph of retroreflective article 100 of Example 2, ...

example 3

[0101] A printed article 200 having alphanumeric characters 266 and machine-readable information 280 is provided as described in Example 2, except that: (1) an optically inactive substrate (white vinyl sheet (available from 3M Company under the trade name "CONTROLTAC") is used. Graphic Film IJ180-10" obtained)); and (2) not laminating a light-transmitting film over the printed sheet.

[0102] Figure 10 is a digital photograph of an optically inactive article 200 taken under ambient conditions using a "PowerShot G12" camera. In ambient light conditions, the machine-readable information 280 is obscured by the alphanumeric characters "SAM 123" 266 . Figure 11 Digital photograph taken by "Lu165" camera under off-axis infrared illumination. Only machine-readable information 280 is visible under this condition.

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Abstract

Retroreflective articles comprise a substrate and a bar code provided on the substrate. The bar code comprises at least one human-readable information which provides framing information and a machine-readable information which provides variable information. The human-readable information is visible under a first condition and invisible under a second condition, and the machine-readable information is invisible under the first condition and visible under the second condition.

Description

technical field [0001] This patent application generally relates to retroreflective articles having machine-readable codes useful, for example, in machine vision systems. Background technique [0002] Ideally, the license plates have an overall similar style or appearance to enable quick identification of license plates issued by different licensing authorities and to discourage counterfeiting. At the same time, the license plate should provide a different, personalized and unique identification code or image for each vehicle, each state, or each driver. Many licensing agencies offer "flashy" licenses for this reason. Such license plates allow drivers to choose an attractive or meaningful design or message to be printed on their license plate. The result of such "flashy" license plates is that states offer their constituents a multitude of different license plate designs. [0003] At the same time, automated enforcement systems, including, for example, electronic toll col...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K19/06
CPCG06K19/0614G06K19/06103G06V20/62B60R13/10G06K7/14E01F9/60
Inventor 帕特里克·R·弗莱明托马斯·J·达林
Owner 3M INNOVATIVE PROPERTIES CO
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