For the limitation of the current license plate location algorithms,the paper
presents an algorithm of license plate location based on the image 2D area energy and its
practical formulas,and Introduces the algorithm of extraction and methods to verify the
region of the license plate. It takes full advantage of the characteristics of the license
plate,such as complicated textures,sharpcut contrast,and so on. It also has the advantages
to avoid the difficulty to choose a threshold and the influence of color changes due to
light.Many experiments demonstrate that the algorithm is of higher accuracy and of fast
speed.