Object detection for sudden illumination changes using order consistency
US7006128B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2002 |
| Grant date | Feb 28, 2006 |
| Priority date | — |
| Expiry date | Feb 26, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T7/254
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system and method for object detection with sudden illumination changes provides a system including a camera model unit for computing a difference map between a first input image and a second input image, an illumination model unit in signal communication with the camera model unit for comparing the sign of the difference between two pixels in a first input image against the sign of the difference between two pixels in a second input image, and a CPU in signal communication with the camera model unit and the illumination model unit for detecting a changed object in accordance with said comparison when said sign of the difference is changed; and a corresponding method including providing a first image having a number of pixels, receiving a second image subsequent to the first image, calculating a difference map between the first and second images, selecting a pair of pixel locations from the first or second images in accordance with the difference map, statistically modeling a camera noise level for the first and second images, computing the likelihood of order inconsistency between a pair of pixel values at the selected locations in the first image and a pair of pixel values at t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.