A transcoder device. The transcoder device includes an input portion for receiving at least two encoded camera image streams and for decoding the at least two encoded camera image streams, the two camera image streams displaying different sub-sections of a monitored region, an output portion for encoding a video image stream and for outputting the encoded video image stream, and a processing portion for generating the video image stream on the basis of the at least two camera image streams. The video image stream displays a selecting portion of the monitored region, the selecting portion 15 including a sub-region of the one sub-section of the monitored region and a sub-region of the other sub-section of the monitored region which does not overlap the former sub-region.