A camera device includes an image capturing module, a face detection module, a light detection and ranging (LIDAR) system, a storage module, and a microprocessor. The image capturing module continuously captures images of a determined filed. The face detection module detects the images to obtain a face to be tested, and records coordinates of the face in the image. The LIDAR system scans the face to be tested in the determined field according to the coordinates thereby to obtain three-dimensional information of the face to be tested. The storage module stores three-dimensional information of a determined face. The microprocessor compares the three-dimensional information of the face to be tested with the three-dimensional information of the determined face, and then outputs a recognition signal.