Primary Reserch On The License Plate Recognition (LPR)

Mainly used in highway traffic management, License Plate Recognition (LPR) System is one kind of Intelligent Transportation Systems (ITS). LPR finds its increasingly wide and important applications in highway electronic toll collection, red-light violation enforcement, secure-access control at parking lots and locating vehicles stolen, or those registered to fugitives, criminals and smugglers. A typical LPR System consists of a video image-acquisition subsystem, an image-preprocessing unit, a plate character isolation & recognition engine and a local storage or remote transmission subsystem.ITS and LPR are reviewed briefly in the first chapter of this paper. To give a whole idea of LPR, Chapter Two describes how a LPR System works. A multiplayer method is used in division of the License Plate to solve how to go to and pick up the plate character. A method of the projection and correlation method is used in identifiving the plate character.Two important subsystems of LPR are considered in Chapter Three and Chapter Four separately: Plate Character Isolation & Recognition. Plate Character Isolation refers to the process to find the plate in a car image and separate each plate characters, which include Chinese, English and digital characters. Just as its name implies, Plate Character Recognition means recognizing the isolated plate characters and in turn identifying the whole license plate.