PAN Wu-mo,JIAO Yang,WANG Qing-ren
2001, 15(3): 51-57.
Automatic document understanding has undergone great progresses in the past decade. Yet the difficulties due to image skewness have not been overcome. Such difficulties are especially vital in Chinese Business Card understanding systems.Because of the complex card layout ,none of current de-skew algorithms shows satisfactory performance on Chinese Business Card image. Although Hough transform has been widely used in the de-skew of general document image ,it’s application to Chinese Business Card image needs more research effort . In this paper ,we proposed a two-stage Hough transform algorithm and applied it to our card understanding system. This algorithm takes advantage of the characteristics of card images and improves both accuracy and time complexity. Such improvement has been proven by the experimental results.