Motion detection system and method
US8039799B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 2008 |
| Grant date | Oct 18, 2011 |
| Priority date | — |
| Expiry date | Apr 7, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J5/0846
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system and method for detecting the presence of a moving object within a detection zone is provided. The system includes a first sensor responsive to light in a first range of wavelengths in the detection zone, a second sensor responsive to light in a second range of wavelengths in the detection zone, wherein the second range of wavelengths is different from the first range of wavelengths, and a processing component for generating a variable threshold value for the first sensor based upon at least maximum and minimum output signals from the second sensor within a predetermined period of time, and for comparing the first output signal with the variable threshold value. The processing component generates an activating signal if the first output signal exceeds the threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.