As such, an infrared light source 12 may be turned on to assist the infrared camera 22 in acquiring the image of the face (i.e., the face image).

In some embodiments, for example, the infrared camera 22 has insufficient infrared light acquisition capability due to the relatively low configuration of the infrared camera 22, thereby causing the infrared camera 22 to not separately acquire the face image. Therefore, at least one infrared light source 12 may be turned on to assist the infrared camera 22 in acquiring the face image, and other infrared light sources 12 except the at least one infrared light source 12 are turned off or remain turned off to reduce power consumption of the electronic device 100. The at least one infrared light source 12 is turned on means that at least one of the at least two infrared light sources 12 is turned on. For example, any one of the at least two infrared light sources 12 may be turned on at first and the infrared camera 22 is controlled to acquire the face image, and it is determined whether the infrared camera 22 successfully acquires the face image. If the face image is successfully acquired, the subsequent control method may be performed, for example, S34: the image of the face is processed to obtain the position information of the face. If the face image is unsuccessfully acquired, one more infrared light source 12 may be turned on, or the infrared light source 12 that is currently turned on may be turned off and another infrared light source 12 may be turned on; and the infrared camera 22 is controlled to acquire a face image until the face image is successfully acquired.