Abstract: In order to study the color characteristic changes of emergency evacuation signs in low - illuminance fire scene, a method for quantifying low-illumination color features based on the Min’s distance is presented. The color characteristic parameters of fire scene sign background under low illuminance are studied by statistical method. Firstly, the image samples of the background were obtained in the indoor lighting environment and the low illumination single fire environment through experiments; Secondly, the test statistics and feature extraction of the experimental samples are carried out; Finally, the Min's distance and variance of the samples were analyzed.The results show that the effect of the use of the background of the near fire sign becomes worse, especially in green and blue. The non - contact measurement of the Min's distance method can effectively measure the value of each channel, and it can also analyze the influence of each parameter on the result.

Key words: low illumination, color characteristics, fire scenario; evacuation sign