1. System for generating virtual interest points in an image, according to detected interest points in that image, detected by an interest point detector, the system comprising: an interest point density map producer, said interest point density map producer receiving said image including said detected interest points, said interest point density map producer produces a density map of said detected interest points within said image; an interest point generator coupled with said interest point density map producer, said interest point generator receiving said image including said detected interest points and said interest point density map, said interest point generator determining image areas for generating virtual interest points, said interest point generator generating at least one virtual interest point, at said determined areas, according to at least the position of one of said detected interest points, said virtual interest point was not detected by said interest point detector.