Control grid interpolation using motion discontinuity patterns
Joon H. Sung, Joonho Chang, Dong-Il Chang, ChoongWoong Lee · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1998
Control grid interpolation (CGI) was suggested to overcome the drawbacks of the block matching algorithm such as blocking artifacts. In CGI, smooth motion field is obtained because motion vectors are spatially transformed from the control points. However, when there are more than two objects which move in different directions, distortion may be involved near the motion boundaries due to the continuity of the motion field. To cope with this problem, we use motion discontinuity pattern and the motion vectors are transformed according to the motion discontinuity. For the determination of motion discontinuity pattern, the similar vectors are grouped together and the grouping pattern is checked. Since this determination is carried out by simple calculation of the motion vectors which are available at the decoder, no side information is necessary and the additional complexity is negligible. The modified CGI with motion discontinuity outperforms the conventional CGI in objective and subjective qualities.