With the gradual maturity of image processing and embedded development technology, the conventional video detection system is improved towards the intelligence and the miniaturization. Embedded development board and embedded Linux OS offer enough support for this trend. This paper firstly introduces the construction of the hardware and software's platform, and then describes the system framework made of three main modules. As the hardcore of the whole system, classic object-detection algorithms are introduced. Pointing to shortcomings of the selected algorithm, the improved methods and the optimized idea are presented. Test results prove that our system achieves good effects finally.