INDICIA READING TERMINAL WITH NON-UNIFORM MAGNIFICATION
First Claim
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1. An indicia reading terminal, comprising:
- a two dimensional image sensor comprising a plurality of pixels extending along an image plane, an optical imaging assembly for use in focusing imaging light rays onto the plurality of pixels of said two dimensional image sensor, and a housing encapsulating the two dimensional image sensor array and the optical imaging assembly,wherein the optical imaging assembly comprises a lens element having a non-uniform magnification defined by a magnification curve that describes a prescribed level of magnification of the lens element, andwherein said terminal is operative to apply a distortion correction that corresponds to the magnification curve.
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Abstract
Embodiments of an indicia reading terminal have multiple fields of view (“FOV”). This feature allows decoding of decodable indicia that exhibit different characteristics. These characteristics may affect the ability of the terminal to identify and decode the information stored therein. In one embodiment, the terminal comprises an optical imaging assembly with at least two FOVs. One of the FOVs is adequate to acquire information from decodable indicia with higher density than other decodable indicia.
485 Citations
19 Claims
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1. An indicia reading terminal, comprising:
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a two dimensional image sensor comprising a plurality of pixels extending along an image plane, an optical imaging assembly for use in focusing imaging light rays onto the plurality of pixels of said two dimensional image sensor, and a housing encapsulating the two dimensional image sensor array and the optical imaging assembly, wherein the optical imaging assembly comprises a lens element having a non-uniform magnification defined by a magnification curve that describes a prescribed level of magnification of the lens element, and wherein said terminal is operative to apply a distortion correction that corresponds to the magnification curve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for imaging decodable indicia on a target, said system comprising:
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an indicia reading terminal comprising a data capture device, the data capture device comprising a pixel array and optics through which passes light reflected from the decodable indicia, and a housing encapsulating the data capture device; an external server in communication with the indicia reading terminal, the external server external to the indicia reading terminal; wherein the system is operative, in response to an operator initiated command, to capture a frame of image data and processes the frame of image data for attempting to decode the decodable indicia, wherein the optics conform to a magnification curve that defines a varying level of magnification for the optics, and wherein the varying levels of magnification comprise a relatively high level of magnification that corresponds to a center portion of the field of view and a relatively low level of magnification that corresponds to a portion of the field of view about the periphery, and wherein the terminal is operative to process the frame to accommodate for differences in the high level and the low level.
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- 11. A system according to claim 11, wherein the terminal is operative to accommodate for image distortion.
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15. A method of decoding a decodable indicia, said method comprising:
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acquiring a frame of image data using optics having a magnification curve defining a varying level of magnificiation; applying a distortion correction to the image data; locating a decodable indicia in the frame; and attempting to decode the decodable indicia.
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- 16. A method according to claim 16, further comprising searching data that corresponds to a first area of pixels on an image sensor for decodable indicia, wherein the first area corresponds to a level of magnification that is suitable for high-density decodable indicia.
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17. A method according to claim 17, wherein the first area corresponds to one of a plurality of fields of view in which the decodable indicia is found.
Specification