1. An image pickup device, comprising: an optical lens; an electronic shutter, which functions as a control gate for the optical lens to control image picking of the optical lens; an image detection device, which detects an image picked up by the optical lens through the electronic shutter to convert the image to generate image data; a micro-controller, which is connected to the image detection device to receive the image data generated by the image detection device; an image storage memory, which is connected to the micro-controller for storing the image data; a recognizable characteristic image database, which is connected to the micro-controller and contains at least one recognizable characteristic image; and a shutter control circuit, which is connected to the micro-controller and the electronic shutter and is operable to control the electronic shutter based on a shutter control signal generated by the micro-controller; wherein the micro-controller compares an image of a selected object that is picked up by the optical lens with the recognizable characteristic image contained in the recognizable characteristic image database and wherein when an image contained in the image of the object so picked up is identified to match the recognizable characteristic image, the micro-controller sends out the shutter control signal to control the electronic shutter through the shutter control circuit to have the image of the object photographed and stored in the image storage memory.