of infrared lamps can achieve an average light intensity of 300 mw sr under a current as large as 1000 ma passing through within a very short time period the light intensity of the group of infrared lamps can increase from 6 5 mw sr under a constant current of 20 ma to 300 mw sr the group of infrared lamps are turned on by the large current lasting a short time period and repeating at a high frequency during the human facial identification process the group of infrared lamps are turned on when the dsp provides the on signal and turned off after the human facial identification process is accomplished as a result the light intensity of the infrared backlight is greatly increased so as to provide sufficient illumination for collecting features of the human face to be identified this facilitates rapid location of the human face by the human facial identified algorithm according to the embodiment of the present invention the features of the human face to be identified are collected under illumination of the infrared backlight and compared with the human facial templates to identify the human face the infrared backlight is turned on by the large current lasting a short time period and repeating at a high frequency and thus the light intensity thereof is increased as a result influence on the features of the human face to be identified by the variation of the outdoor light can be alleviated and the accuracy of outdoor human facial identification can be increased fig2 schematically shows a diagram.