Study on the correlation between position of indoor low-level flame and the light characteristics through the door slits
In order to study how to locate the indoor low-level flame through the door slit light characteristics under the full oc-clusion environment,a ISO 9705 standard room was con-structed,with a 90 cm×2 cm slit between the door and the floor,and a 0.5A standard wood stack fire was used to simulate the in-door low-level fire.The change of the door slit light characteris-tics was recorded by the outdoor video,and the change rule of door slit light characteristics and the correlation between the in-door low-level flame position and the door slit light characteristics was analyzed,coupled with the MATLAB luminance recognition and image processing technology.The results show that the geom-etry of the door slit light was roughly quadrilateral under a certain luminance threshold,when the flame is located in the center axis of the door,the geometry is isosceles trapezoidal,and when the flame is biased to the side,the door slit light is deflected to its op-posite side.As the distance of the flame from the door increased,the angle of the quadrilateral girdle decreased,while the exten-sion distance of the door slit light first increased and then de-creased.The correlation was obtained between the indoor low-level flame position and the geometric parameters of the door slit light.The distance of the flame from the door and the extension distance of the door slit light can be characterized by the segmenta-tion function.The study can provide a technical reference for lo-cating the position of indoor fire after a fire accident by video.
fire investigationvideo analysislight through the door slitsfire location
NETL
NSTL
万方数据
维普
