Patent ID: 7376244
Filing Date: 2008-05-20
Classification: G06T,H04N

Abstract:
1. A surveillance system for detecting an event, comprising: a sensor for capturing a current image using a first exposure time to produce sensor values representing said current image and capturing an event image using a second exposure time; and an image processing system for performing a comparison of at least a portion of said sensor values representing said current image and spatially corresponding sensor values of a stored reference image captured using said first exposure time, said image processing system further for detecting said event in said current image based upon said comparison and instructing said sensor to capture said event image using the second exposure time; wherein the first and second exposure times are, respectively, first and second time periods for exposing an array of pixels to capture a respective image to produce sensor values, the second exposure time is less than the first exposure time, and the respective image captured by the first exposure time includes several consecutive first image frames and the respective image captured by the second exposure time includes several consecutive second image frames and the first image frames are captured entirely during the first time period and the second image frames are captured entirely during the second time period.