1. A method for searching image information comprising the steps of: extracting a trajectory of an interesting object in a picture frame sequence, pre-processing the extracted trajectory to a pre-processed trajectory by a reduction to relevant location points, whereby the relevance of location points is defined by a first criteria of a maximum distance between two filtered location points and by a second criteria of a maximum deviation of a moving direction of the object between two filtered location points, storing the pre-processed trajectory as data in a database, applying search queries on the pre-processed trajectory data of the database, and indexing the pre-processed data of the extracted trajectory by grouping the pre-processed data into sub-trails and representing each sub-trail with a minimum bounding rectangle.