OPTICAL READERS AND METHODS EMPLOYING POLARIZATION SENSING OF LIGHT FROM DECODABLE INDICIA
First Claim
Patent Images
1. An indicia reading terminal comprising:
- an illumination subsystem;
an imaging subsystem comprising an image sensor array and an imaging optics assembly operable for focusing an image onto said image sensor array;
a polarization sensor;
a housing incorporating said illumination subsystem, said imaging subsystem, and said polarization sensor;
wherein said indicia reading terminal is adapted based on said polarization sensor to at least one of control said illumination subsystem and capture one or more images; and
wherein said indicia reading terminal is operable to attempt to decode a decodable indicia using the one or more images.
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Abstract
A method for decoding decodable indicia includes sensing the polarization of light from a plurality of orientations in connection with the decodable indicia, and controlling at least one of energizing an illumination subsystem based on the sensed polarization indicating a generally randomly polarized light, and inhibiting energization of the illumination subsystem based on the sensed polarization indicating a generally linearly polarized light. One or more images are captured, and an attempt is made to decode the decodable indicia using at least one of the one or more images.
23 Citations
34 Claims
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1. An indicia reading terminal comprising:
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an illumination subsystem; an imaging subsystem comprising an image sensor array and an imaging optics assembly operable for focusing an image onto said image sensor array; a polarization sensor; a housing incorporating said illumination subsystem, said imaging subsystem, and said polarization sensor; wherein said indicia reading terminal is adapted based on said polarization sensor to at least one of control said illumination subsystem and capture one or more images; and wherein said indicia reading terminal is operable to attempt to decode a decodable indicia using the one or more images. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 30, 31, 32, 33, 34)
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19. A method for decoding a decodable indicia, the method comprising:
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sensing the polarization of light from a plurality of orientations in connection with the decodable indicia; controlling at least one of energizing an illumination subsystem based on the sensed polarization indicating a generally randomly polarized light, and inhibiting energization of the illumination subsystem based on the sensed polarization indicating a generally linearly polarized light; capturing one or more images, and attempting to decode the decodable indicia using at least one of the one or more images. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification