SPECIFIED VEHICLE DETECTION DEVICE

PROBLEM TO BE SOLVED: To always image-pick up a vehicle video at optimum timing and to simplify an image processing while secrecy is improved by light-emitting a stroboscope in accordance with information from an image pickup timing detection device and image-picking up one image at every vehicle from the back of the vehicle to be detected with a video camera. SOLUTION: The image pickup timing detection device 24 is provided and the back of the vehicle 42 to be detected is image-picked up at optimum timing by one image on one vehicle. The detection timing device 24 transmits/receives an infrared pulse beam toward the front direction of travel on a road. A moment when the vehicle to be detected 42 passes a previously decided point, which can be detected by measuring the phase difference of the transmission/ reception optical pulses, is outputted as information. The detection information is inputted to a CCD camera 20 and the stroboscope 21 and the stroboscope emits light. The image at that time is image-picked up. Thus, the number of the image to be processed can be reduced. Image pickup and light emission can be executed once at every vehicle from the back and secrecy can be improved.