Patent ID: 7079668

Claim:
A vehicle monitoring system for taking a fail-safe measure for a fault monitoring condition on a monitored image, comprising: a camera device provided on a vehicle for taking the monitored image; and a controller for judging an optical irregularity occurred on the monitored image by taking the fail-safe measure when a fail-safe measure requirement using a first parameter is met on the monitored image for a predetermined first period, and for interrupting the fail-safe measure when a fail-safe measure-release requirement using a second parameter is met within a predetermined second period after the fail-safe measure-interruption requirement has been met, wherein the second parameter is different from the first parameter, and the first parameter includes at least a value obtained by normalizing an addition of a luminance-characteristic value on the monitored image by a shutter speed of the camera device and a specific number of data related to luminance edges on the monitored image and the second parameter includes at least the shutter speed and the addition of a luminance-characteristic value.