Abstract: An interlace/progressive transforming algorithm which is to get high quality progressive frame picture from interlace field picture is proposed. In this algorithm, motion estimation technology is used to find out the motion vector between the two neighboring field pictures. Then in the process of line interpolation, the motion vector is used to adjust the first field picture's location. The motion blur, which is caused by image slip, can be eliminated. The progressive picture that is produced by the algorithm possesses high vertical resolution. In the algorithm, we design a special motion estimation approach to fit in with this application.