Study On The Forest Fire Behavior Measurement System

The rate of spread of fire is a import index of forest fire behavior,the rate of spread of fire as the measuring object,used visible image and infrared image measured, Image measurement is mainly composed of three parts, Image measurement is mainly composed of three parts, Forest fire image acquisition, Forest fire image processing, Camera calibration and measurement results, In this paper, the image measurements of the three components were studied, And compare the result image measuring and simultaneous measurement of the pole method and thermocouple method, and calculate the error rate was measured by the image spread, Analysis the some of the factors affecting measurement precision of image method,(1) The results measured were compared Results indicate that the mean absolute error and relative error of the visible image method is0.0354m·min-1and3.49%compared with the pole method and0.0344m·min-1and3.31%compared with the thermocouple method, respectively. the mean absolute error and relative error of the infrared image method is0.0356m·min-1and3.51%compared with the pole method and0.0346m·min-1and3.52%compared with the thermocouple method, respectively. The rates of spread measured by the three methods show no significant differences. Since the pole method and thermocouple method can only provide the rate of spread of a particular point or time while the image method can measure rates of spread of one or many points, the image method is superior to these two methods and thus can take place of the later ones(2) Viewing angle of camera does not have significant influence on accuracy of the visible image and infrared method. Wind increases rate of spread and also the absolute error of rate of spread measured by the image method with relative constant relative error. The farther the distance of a fireline in a fire image to the lower boundary of the image, the larger the error of rate of spread measured by the method.(3) Compared with the visible light image, infrared image with fire behavior characteristics in image processing is easier than visible light image pixels, but the infrared image obtained is320×240, visible light image of the1920×1080is much smaller, perspective is more obvious, so in this research in infrared image edge was not shown in this study, but also to meet the needs of study.