Abstract
To find the optimal parameter of flame detection for outdoor fire under transverse airflow and illumination environments, experiments were carried out in the standard combustion room and outdoors to investigate the characteristics of four candidate flame parameters (RGB color, oscillation frequency, contour coefficient and area growth rate). Coefficient of Variance (CV) was introduced to analyze the stability of these flame parameters. Experimental conditions included fuels of ethanol and wood cribs, flow velocities of 1.5-8 m/s which can simulate the general wind speed. The study results show that, flame RGB color could be affected by illumination while oscillation frequency and area growth rate could be influenced by airflow, airflow and illumination had little influence on flame contour coefficient and flame contour coefficient is stable and fluctuates within a certain range. Under the comprehensive comparison of the four parameters and the calculated Coefficient of Variance of them, flame contour coefficient is the optimal parameter for outdoor fire video detection when considering the interference of wind and illumination. The experimental results were also validated by processing the videos of China Central Television Station building fire and a construction-in-process building fire
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