Abstract: Surveillance method and system for monitoring a location. One ore more sensors, e.g. camera's, are used to acquire sensor data from the location. The sensor data is processed in order to obtain an extracted object list, including object attributes. A number of virtual objects, such as a virtual fence, are defined, and a rule set is applied. The rule set defines possible responses depending on the list of extracted objects and the virtual objects. Rule sets may be adapted, and amended responses may be assessed immediately.

Abstract: Transmitter (1) and receiver (3) for transmission of data in e.g. a surveillance system. A stream of data from a data source (6) is transmitted to a data destination (3) using a nominal bandwidth. The instantly available bandwidth is determined and when the instantly available bandwidth is smaller than the nominal bandwidth the stream of data is divided in a first part and a second part. The first part is transmitted and stored at the data destination (3), while the second part is stored at the transmitter (3). When the instantly available bandwidth is larger than the nominal bandwidth the second part is retrieved and transmitted. At the data destination (3), the first part is retrieved for merging the first part and second part to obtain the original data stream.