Multi-Media Modeling Conference, International (1998)
Oct. 12, 1998 to Oct. 15, 1998
Yasuo Nagai, Isao Tonozuka, Eihachiro Nakamae and Katsumi TadamuraWe present very simple but effective algorithms to playback a standard video tape recording at any higher/slower rational time speed in accordance with varying demand. To avoid temporal signal sampling errors for a slow speed playback and spatial ones for a high speed one, the following four step algorithms have been developed:(1) Sequences are separeted even and odd fields, and intermediate noninterlaced frames are made by vertical interpolation. (2) For slow down the playback speed of video sequences, linear interpolation between two frames surronunding a fractional frame position is used. (3) For speed up one average frames in a window surrounding the desired frame with the window size depending on the speed up factor is used. (4) Sequences are post processed by decimation to get back interlaced images. The proposed algorithms give quite smooth sequence images for slow speed sequences and nondiscontinuous and less jittering ones with appropriate motion blur for high speed ones.
E. Nakamae, I. Tonozuka, K. Tadamura and Y. Nagai, "Simple Algorithms for Rational Time Speed Playback of a Standard Video Sequence," Multi-Media Modeling Conference, International(MMM), Lausanne, Switzerland, 1998, pp. 52.