Study on method of recover data from figure by image processing technology

In many papers, data were given by figure which can not read data directly. In most situations data can only be acquired by author, which is inconvenient and time-delayed. As to the papers of many years ago, to ask for data from author is almost impossible. So recovering data from figure is the most practical way. This paper introduces the data recover process using the image processing technology. The authenticity is guaranteed using matlab program. It is a simple approach to get data from figure.