05756981 is referenced by 568 patents and cites 88 patents.

An optical device for reading one- and two-dimensional symbologies at variable depths of field. The device has a light source for projecting emitted light toward the symbol image to be reflected back to an optical assembly, or zoom lens. The zoom gives multiple field of view capability to a CCD detector for detecting the reflected light, and generating a proportional electrical signal. The sensor is aimed for reading the symbology by a frame locator including a light source that emits a beam divided by diffractive optics into beamlets matching the dimensions of the respective field of views. Refractive optics are shifted in response to movement of the zoom lens for aiming the beamlets to form an aiming frame in accordance with the depth of field selected by the zoom lens. The device includes a microcomputer that communicates with a host PC including an API library with downloadable applications for image processing, including segmenting, analyzing, and decoding.

Title
Optical scanner for reading and decoding one- and-two-dimensional symbologies at variable depths of field including memory efficient high speed image processing means and high accuracy image analysis means
Application Number
843266
Publication Number
5756981
Application Date
August 1, 1996
Publication Date
May 26, 1998
Inventor
Donald Fisher
Valley Center
CA, US
Long Xiang Bian
San Diego
CA, US
Ali Lebaschi
San Diego
CA, US
Roland L Lawrence
San Diego
CA, US
Alexander R Roustaei
La Jolla
CA, US
Agent
Brown Martin Haller & McClain
Assignee
Symbol Technologies
NY, US
IPC
G06K 07/10
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