Rectification of License Plate Images Based on HT and Projection

Hongyao Deng, Qingxin Zhu, Jingsong Tao, Hao Feng


It is crucial to segment characters correctly and improve rate of correct character recognition when processing automobile license plates corrections. In this paper, two algorithms are proposed to obtain the horizontal tilt and vertical shear angles. The transformation matrix for images rectification is given and the subpixel issue is solved. Some experiments were done to test the algorithms. Experimental results show that the algorithm is robust, flexible and effective.



license plate; horizontal tilt; vertical shear; subpixel issue; plate correction

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