Survey on Automatic License Plate Detection Methods

Abstract—License Plate Recognition (LPR) systems commonly have framework of processing steps such as: Detection of number plate, Segmentation of plate characters and Recognition of each character. Number plate detection is a challenging task due to diversity of plate formats and environmental conditions during the image acquisition. Accuracy of character segmentation and recognition rely on the efficiency of plate detection. Various algorithms are developed for this work. Purpose of this paper is to categorize and brief them. Keywords—License plate detection, Vertical edge matching