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An effective approach based on geometric constraint of the motion vector field is proposed to detect camera zoom operation. The approach exploits the valid motion vectors to estimate the center of focus (COF) for zoom, and then calculates the average distance from the COF to valid motion vectors to identify zoom operation. To reduce the influence of object motion, Visual attention mechanism is employed...
This paper proposes an optimization method of network access control policy based on NDIS data packet filtering techniques, and then a solution is developed to design network access control system. Based on this scheme, the program running on the interconnect device which supports Media Access Control Layer and Network Layer could capture, transmit or discard data packets with the access control rules...
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