| Abstract |
The present invention describes a global motion estimation method between an incoming frame F(n) of a sequence of frames and a large static image M(n-1), which is constructed from previous frames F(1), F(2), ..., F(n-1) of the video sequence. This motion estimation method uses a motion model based on a two-dimensional perspective transform, which contains eight motion parameters. In the present invention, the eight motion parameters are the coordinates of the four vertices of the incoming frame. The motion estimation method according to the invention enables any displacement of the four corners of the original rectangular image to fit the next one by optimizing a cost function. Such an invention can be useful for applications related to MPEG-4 and, more especially, to MPEG-7 standard, such as sprite generation or mosaicing. |