Real-time and Automatic Close-up Retrieval from Compressed Videos

This paper proposes a thorough scheme,by virtue of camera zooming descriptor with two-level threshold,to automatically retrieve close-ups directly from moving picture experts group(MPEG)compressed videos based on camera motion analysis.A new algorithm for fast camera motion estimation in compressed domain is presented.In the retrieval process,camera-motion-based semantic retrieval is built.To improve the coverage of the proposed scheme,close-up retrieval in all kinds of videos is investigated.Extensive experiments illustrate that the proposed scheme provides promising retrieval results under real-time and automatic application scenario.