For the key technology of vehicle license identification-license orientation, the transaction process is presented, including the main technology of theory and practical methods of color image graying, gray image binary coding, noise filtering,license searching,region reduction and so on.

Localization and segmentation of automobile license plate image based on horizontal line scanning;

A novel algorithm for the license plate attribute identification is presented(attribute means one-row or two-row characters that license plate really has in this paper).