| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a device for detecting visibility capable of detecting deterioration of visibility owing to bad weather, etc. and detecting a dangerous vehicle that is stopping, running slowly, etc. SOLUTION: The device for detecting visibility comprises: a vehicle detecting part 131 that finds the position and the speed of a vehicle from a beat signal of a reflected wave; a speed judging part 132 that makes judgment of a speed of the vehicle detected by the vehicle detecting part 131; a region difference extracting part 134 that inputs an image photographed by a camera 220 and measures the region of the vehicle; a region reduction ratio calculating and judging part 135 that finds a reduction ratio of the region of the vehicle in a predetermined time from the region of the vehicle and the region of the vehicle after the predetermined time; and a visibility distance judging part 136 that measures a visibility distance from the distance from the vehicle in the respective times and the reduction ratio of the region of the vehicle. This enables visibility deterioration and a dangerous vehicle to be detected. A method for detecting visibility using this visibility detecting device may also be provided. COPYRIGHT: (C)2006,JPO&NCIPI
|
