| 摘要 |
PROBLEM TO BE SOLVED: To surely detect a certain size of fire regardless of a distance on the basis of an observation image in which light is reduced due to smoke. ! SOLUTION: A floor surface illumination device 22a and a wall surface illumination device 22b illuminate the floor surface and the wall surface of a monitoring area imaged by a monitoring camera 10. A smoke image determination part 30 determines a smoke image in which a smoke plume exists from a smoke observation image of the monitoring camera 10. A prospective angle detection part 32 detects a prospective angle of the smoke plume. A light reduction rate detection part 34 detects an attenuation rate of a background light quantity by the smoke plume. A plume thickness estimation part 36 estimates the thickness of the smoke plume corresponding to the light reduction rate from the relationship between the light reduction rate and thickness of the smoke plume by model fire. A distance calculation part 38 calculates a fire point distance to the smok |
