License plate recognition system technology principle is introduced

Is the topic of this paper to introduce: correct understanding of the license plate recognition system.
first of all, give us the principle of license plate recognition system: license plate recognition system is through the image capture, image preprocessing, license plate locating, character segmentation and character recognition, comparison and calculation on the existing scheme.
among them, the image capture is often done by triggering sense to capture, image capture is a very important link, the Angle and light decides the quality of the image;
image preprocessing: is the methods of gray level transformation, homomorphic filtering and smoothing of image processing, improve the quality of the image.
license location: this is a crucial step in license plate recognition system.First on the existing positioning algorithm on the basis of the comparison and analysis, and summarizes the algorithms in common.On this basis, put forward its own positioning method, the method including coarse positioning and fine positioning, and adopted the method of gray level characteristics and new methods of color characteristics of the method.
character segmentation: first of all to remove the upper and lower border of the license plate, then using the method of connected domain segmentation have individual character, and the characters of adhesion block for further processing.
character recognition: the use of related software, hardware processing, identify the transformation for character recognition.
to understand the principle of license plate recognition at the same time, should also pay attention to the correct understanding of environment on the spot, not all the environment suitable for installation of the license plate recognition.On-site environmental chaos, pot-holed roads, water often easy to keep out license plate terrain, light conditions, such as narrow road environment is not suitable for installation of license plate recognition system.