Description: License Plate Recognition (LPR) system is one of the most important parts in
Intelligent Transport System （ITS）, the characters segmentation and the characters
recognitiont are the key technology of the LPR system.In this paper, a characters
segmentation algorithm based on types of past algorithm is put forward.which is fast
and its accuracy is high. The key technologies of LPR are researched and discussed in
this algorithm, includeing gray Preprocess of image, image binarization, gradient
emendition, The Horizontal of segmentation and vertical segmentation, character
normalization 。Character segmentation algorithm in which the most critical part is the
vertical segmentation algorithm which use of characters in a fixed aspect ratio features,
extract the character height, and get the character width, segment the license plate
character. In addition, this paper has done improved research about the vertical traverse
density (VTD) and horizontal traverse density (HTD)character r
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