Noise reduction by image subtraction in an automatic data collection device, such as an image acquisition device
US8295640B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 2006 |
| Grant date | Oct 23, 2012 |
| Priority date | — |
| Expiry date | Sep 11, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An automatic data collection device (10) and method reads images from display screen (22) of an electronic display device (24), such as a cellular telephone. The method reads a flashing image of a target machine-readable symbol (12) displayed on the display screen, by obtaining at least two images of the display screen. In the first image, the image of the target machine-readable symbol is present. In the second image, the image of the target machine-readable symbol (12) is absent. The second image of the display screen, when the image of the target machine-readable symbol is absent, comprises noise and other images that are irrelevant to the decoding process. This noise in the second image is subtracted from the first image of the display screen having the image of the target machine-readable symbol displayed thereon the symbol. A resulting image from the image subtraction is an improved image of the target machine-readable symbol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.