Method of setting the time duration of illumination from an LED-based illumination array employed in a digital imaging-based code symbol reader, using an image-processing based illumination metering program executed therewithin
US7527206B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2006 |
| Grant date | May 5, 2009 |
| Priority date | — |
| Expiry date | Nov 30, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2207/1012
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A digital-imaging based code symbol reading system comprising an image sensing array with a field of view (FOV), an illumination subsystem with an LED illumination array, an automatic illumination measurement subsystem, an illumination control subsystem, and programmed imager processor supporting an image-processing based illumination metering program. The automatic illumination measurement subsystem automatically measures the illumination level at a particular region of the FOV and determines the illumination duration necessary to achieve a desired spatial intensity in the detected digital image. The illumination metering program automatically analyzes and measures, in real-time, the spatial intensity distribution of the digital image and determines whether or not a corrected illumination duration is required or desired when detecting the next or subsequent digital images, during the current or subsequent object illumination and imaging cycle. The previously determined illumination duration is over-written with the corrected illumination duration, which is used to drive the illumination subsystem and form and detect one or more subsequent digital images of the illuminated object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.