1. A method for detection and tracking of objects in motion ( 16 ) in a scene under surveillance ( 15 ), in which scene, besides the objects in motion ( 16 ), interfering factors ( 17 , 23 ) comprising interfering objects, interfering regions, or both are included, comprising steps of: defining the scene under surveillance ( 15 ) as a plurality of regions that are defined as image sections in the scene under surveillance ( 15 ) that are stationary over the surveillance period, for each frame in an image sequence of frames derived from the scene under surveillance; dividing up the plurality of regions into various region classes, the various region classes including: a first region class (D 1 , 5 ) with sensitive regions in which no interfering factors ( 17 , 23 ) or only insignificant interfering factors ( 17 , 23 ) are located, are expected or are located and expected, a second region class (D 2 , 6 ) with semi-sensitive regions ( 19 ), in which interfering factors ( 17 , 23 ) are located, are expected, or are located and expected; and a third region class (D 3 ) with insensitive regions in which interfering factors ( 17 , 23 ) comprising blind spots are located; performing a sensitive content analysis for detection, for tracking, or both of the objects in motion ( 16 ) in the first region class (D 1 , 5 ) with sensitive regions; and performing a semi-sensitive content analysis for detection, for tracking, or both of the objects in motion ( 16 ) in the second region class (D 2 , 6 ) with semi-sensitive regions ( 19 ), which semi-sensitive content analysis is limited, is modified or both, as compared to the sensitive content analysis; wherein no content analysis for detection, for tracking or both of the objects in motion ( 16 ) is performed in the third region class (D 3 ) with insensitive regions.