| 摘要 |
<p>The invention concerns a system which consists in calculating (1) a field of motion vectors associated with an image, defining, for an image element with xi, yi coordinates, one or several motion vectors of components ui, vi, characterized in that it also comprises the following steps: modelling the motion (2) from a simplified parametric representation: ui = tx+k.xi, vi = ty+k.yi, tx, ty being components of a vector representing the motion translational component, k a divergence factor characterizing the motion zoom component; robust linear regression (3) in each of the two spaces representing the motion defined by the planes (x,u) and (y,v), x, y, u and v representing respectively the axes of the variables xi, yi, ui and vi, to obtain regression lines; calculating the parameters tx, ty, and k (4, 5) from the slopes and the ordinates from which originate the regression lines. The invention is useful for selecting key images for video indexing or for metadata generation.</p> |
