This paper presents a novel wireless projecting and cooperating approach named FreeSpeech based on Ad Hoc network, which makes conference exchange more convenient and ubiquitous. All attendees can access this system by their laptops or other mobile computing devices all around the conference venue and make the projections of their presentations without connecting to the projector physically. Moreover, they can make cooperative display simultaneously with others. FreeSpeech takes a mixed Virtual Networking Computing (VNC) C/S mode based on some improvements on the traditional ones. A novel IP multicast-based transfer and control mechanism is presented to make large numbers of attendees obtain the wall screen contents by their laptops locally without aggravating the overhead of bandwidth remarkably. An efficient remote screen synchronization method is employed to transfer screens of some attendees to the projector-connected computer, which also can save the consumed bandwidth significantly. All above methods use the limited wireless bandwidth more efficiently. Performance evaluation shows that this approach can work perfectly for ubiquitous conference occasions.

Focusing on the non-rigid object tracking problem, this paper presented a new approach for the computation of the matrix of displacement probability (MDP) based on fast block motion estimation algorithm subsampling search candidates in adjustable partial distortion search (SSC-APDS). The surface of the sum of abstract error (SAE) of possible displacements is worked out by it, which leads to MDP. Then an MDP-based time filter was employed to the tracking analysis of every featured block. Finally, the object tracking was obtained according to the integration of all tracking of blocks. Experiment showed that this approach not only has higher robusticity, but also can reduces computation in the object tracking in video surveillance based on video grid.