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Method and apparatus for high resolution decoding of encoded symbols

a high-resolution image sensor and symbol technology, applied in the field of scanning devices for decoding symbols, can solve the problems of affecting the accuracy of reading,

Inactive Publication Date: 2006-02-09
COGNEX TECH & INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a method for decoding various types of symbols in various environmental conditions using a digital scanner. The method involves acquiring a low resolution image data set of a field of view including the symbol and evaluating it to determine if it can be decoded. If the symbol is not decoded, a high resolution image data set of at least a portion of the field of view is acquired and evaluated. This process is repeated until the symbol is decoded. The invention also provides a digital scanner device for decoding symbols and a method for analyzing image data to identify image parameters. The technical effects of the invention include improved accuracy and efficiency in decoding various symbols in various environmental conditions."

Problems solved by technology

Scanning devices including autofocus and bifocal lenses, however, can also be expensive and difficult to use.
Furthermore, as the reader is moved further away, proper illumination of the symbol becomes problematic, rendering accurate reading difficult.
These devices, therefore, require frequent re-positioning, are time-consuming to use, and can also be inaccurate.

Method used

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  • Method and apparatus for high resolution decoding of encoded symbols
  • Method and apparatus for high resolution decoding of encoded symbols
  • Method and apparatus for high resolution decoding of encoded symbols

Examples

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Embodiment Construction

[0022] Referring now to the figures and more particularly to FIG. 1, a handheld digital scanning device 10 useful for performing the present invention is shown. The digital scanning device 10 is provided in a housing 12 having a body section 16 and a grip section 14. The body section 16 provides illumination from a distal end to illuminate a symbol such as a bar code or data matrix, as described below. A moveable trigger 15 provided on the housing 12 is selectively activated by an operator to provide a start signal to an internal processor to illuminate and decode the symbol. A visual or audio indicator, such as an indicator light or buzzer, can also be provided to alert the user when a symbol has been decoded. Typically, the scanning device 10 is connected through a cable 53 to a host computer 50 which receives decode data.

[0023] Referring now to FIG. 2, an exploded view of the digital scanning device 10 of FIG. 1 is shown. A power supply board 20 is provided in the grip section 1...

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Abstract

A method for scanning and decoding encoded symbols comprises processing low resolution image data from a full field of view and / or high resolution image data from one or more windowed segments of the field of view to provide imaging that is easily adaptable to different types of symbols and varying environmental conditions. The scanning method can be switched between the low resolution mode and the high resolution mode automatically based on whether the low resolution data is sufficiently accurate to decode the symbol.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to scanning devices for decoding symbols, and more particularly to a method for decoding symbols using a high resolution image sensor. [0002] Encoded symbols such as ID bar codes, 2D bar codes and symbols, such as data matrixes, are commonly found in retail, industrial, and other applications for identifying labeled goods, products, or components. Bar codes are symbols that comprise a series of alternating white and black elongated bars or modules which are aligned to define a code. Data matrixes comprise a plurality of black and white cells which are arranged in a two dimensional code. Both of these types of codes, as well as various other symbols known in the art, can be found in applications for identifying goods, applied either to a label or printed directly on a part or component. [0003] Devices for reading encoded symbols typically employ an illumination device for shining light on the symbol and a camera module ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06K7/10
CPCG06K7/14G06K7/1465
Inventor NINNINK, LAURENSEQUITZ, WILLIAM H.
Owner COGNEX TECH & INVESTMENT
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