Janne Juhola

Motion adaptive scan rate up-conversion

The interlaced scan format and the low frame rate in current television systems cause visible degradation in picture quality. To improve the picture, scan rate up-conversion can be implemented in the receiver. Typically, the up-conversion algorithms needed in stationary scenes are different from those needed in nonstationary scenes. In this paper we discuss problems related to scan rate up conversion and motion detection. We present an algorithm that adapts to the motion in the picture and yet effectively eliminates most of the artifacts caused by imperfect motion detection. The algorithm is based on a weighted median filter structure and a simple motion detector. The weights of the median filter are adapted according to the motion detector output. All algorithms discussed have been tested with real sequences using a video sequencer.