MPEG-4 streaming for internet surveillance
Xinggang Lin · Journal of Tsinghua University(Science and Technology) · 2003
Video transmissions over IP networks (i.e. Internet) encounter variable bandwidth transmissions. To efficiently utilize the given bandwith to obtain the best possible visual quality, an adaptive selective enhancement algorithm employing motion vectors was developed based on the selective enhancement mechanism of the FineGranularityScalability (FGS) coding scheme of MPEG4. Motion vectors generated during baselayer encoding were analyzed to adaptively locate object regions. The result was then used for selective enhancement during enhancement layer encoding. The proposed algorithm enables FGS to perform contentbased enhancement and prioritized transmission of important regions (object regions). The algorithm significantly improved the video quality of important regions at different bitrates. The algorthm is suitable for applications such as internet surveillance where the backgrounds are still and only the moving objects within the scene are of interest.