Review on License Plate Extraction Technique used in Automatic License Plate Recognition System

Automatic license plate recognition (ALPR) system is also known as an intelligent transportation system (ITS). There are various research issues, presents, in the field of ALPR. ALPR consists of four modules named as license plate extraction, extraction of license plate, segmentation and recognition of characters. The main contribution of this paper is to provide a brief study on different methods of license plate extraction. Different techniques of extraction are described in detail along with their pros and cons. The paper also consists of some future direction in the field of extraction of license plate. Future directions in the field of plate localization are also foresees at the end of the paper.