METHOD FOR EXTRACTING MOVEMENT TRACK INFORMATION BY TIME-SERIES MAPPING WITH LIMITED MOVEMENT RANGE

摘要

PURPOSE:To prevent a pseudo movement track from being extracted by limiting the movement range of a mapped point at last time as specified and selecting only input points at current time in the limited range as mapped points for mapping. CONSTITUTION:When a mapped point is present at time t0, a window which is large to a certain extent centering on the point is provided. When limitations are added by a movement distance, the area of this window can be set according to the maximum movement distance of the mapped point estimated from, for example, the movement quantity of a camera. Further, when the movement distance of the mapped point is estimated in advance, limitations regarding the movement-direction range can be added. Both the limitations may be added. At time t1, only the input points within the movement range set according to the mapped point at the time t0 are extracted as mapped points from input points present at the time t1 and mapping processing is carried out to generate a mapping function. Then, this processing is performed in order at t2, t3 - tn. Thus, the pseudo movement track is prevented from being extracted.