Method and apparatus for detecting an image of a reflective object
US7646934B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 2005 |
| Grant date | Jan 12, 2010 |
| Priority date | — |
| Expiry date | May 8, 2027 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63F2300/8011
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A method of detecting an image of a reflective object includes the steps of capturing an exposure image by an image sensor while an LED is ON; down-sampling an exposure image signal from the image sensor to a first digital signal by comparing the level of the first image signal with a first reference level; capturing a dark image by the image sensor while the LED is OFF; down-sampling a second image signal from the image sensor to a second digital signal by comparing the level of the second image signal with a second reference level; computing an image of difference between the exposure image and the dark image by subtracting the second digital signal from the first digital signal; and specifying the image of the reflective object by locating a bright point remaining in the image of difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.