Surveillance system using active tracking camera has no distance limitation of surveillance range compared to supersonic or sound sensors.However,complex motion tracking algorithm requires huge amount of computation,and it often requires expensive DSPs or embedded processors.This paper proposes a novel motion tracking unit based on different image for fast and simple motion tracking.It uses configuration factor to avoid noise and inaccuracy.It reduces the required computation significantly,so as to be implemented on Field Programmable Gate Array（FPGAs）instead of expensive Digital Signal Processing（DSPs）.It also performs calculation for motion estimation in video compression,so it can be easily combined with surveillance system with video recording functionality based on video compression.The proposed motion tracking system implemented on Xilinx Vertex-4 FPGA can process 48 frames per second,and operating frequency of motion tracking unit is 100 MHz.
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