The location of license plates is the first step of license plate identifica- tion and relates directly to the identification speed and precision of the AVI sys- tem.Therefore,it is the core technology as well as the difficulty of the whole system.At present,the major method of locating license plates is as follow:First pick up the edge of vehicle's image;after that,with the geometric characteristics of license plates,analyze the projection of binary image's pixel in both horizontal and vertical directions....