Table image registration based on gradient projection

In this paper, we present an efficient and robust algorithm for document image registration, especially for table images. The projection-based method reduces the calculation complexity while also loses some information of the original image. The contribution of this paper is that our proposed method enhances the useful information in the projection using the image gradient feature. Besides, the rate of similarity (ROS) is presented to estimate the similarity between two images. Results of experiment show the practicality and efficiency of our proposed method.