High contrast retroreflective sheeting and license plates
First Claim
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1. An optical character recognition system, comprising:
- an optical character recognition camera;
a light source emitting infra-red light that is coaxial with the optical character recognition camera; and
a retroreflective sheeting comprising indicia including a light scattering material;
wherein the light scattering material is a surface that has been selectively roughened;
the retroreflective sheeting comprising indicia including light scatter material is irradiated using the light source and imaged using the optical character recognition camera thereby recognizing characters of the indicia.
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Abstract
The present disclosure relates to the formation of high contrast, wavelength independent retroreflective sheeting made by including a light scattering material on at least a portion of the retroreflective sheeting. The light scattering material reduces the brightness of the retroreflective sheeting without substantially changing the appearance of the retroreflective sheeting when viewed under scattered light.
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Citations
6 Claims
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1. An optical character recognition system, comprising:
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an optical character recognition camera; a light source emitting infra-red light that is coaxial with the optical character recognition camera; and a retroreflective sheeting comprising indicia including a light scattering material;
wherein the light scattering material is a surface that has been selectively roughened;the retroreflective sheeting comprising indicia including light scatter material is irradiated using the light source and imaged using the optical character recognition camera thereby recognizing characters of the indicia. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification