Design Of Embeded Image Surveillance System Based On FPGA

Most of digital surveillance systems are on the basis of on PC platforms,and due to adopting specific acquirisiton card as well as storage device,the whole system has high price and large size. So it is only applied to small district,bank,and supermarket. Compared with PC-based image surveillance system,the embeded image surveillance system has already obtained the more and more widespread application in domains such as common home security,temporary circumstance because of its cheapness and portability.This thesis presents a solution of embeded image surveillance system, especially focus on method of motion detection and image saving.The possibility of motion detection misjudgement can be reduced by adopting the body detection and open operation to the method.For the FPGA platform,the method of conversion of data to image and image saving to SD card is developed.FPGA is adopted as the main controller in the handware circuit and is responsible for maintaining of the whole system .The board is connected to CIS ,PIR,SD card,RS232,and light detect device.The function is realized of image collecting and conversion,motion detection and image saving.All circuits is designed by in both Verilog language code and schematic diagram.This sytem consists of image acquirisiton module,frame buffer,motion detection,body signal detection,sd card ,Nios system and display module.At last the control of NIOS and the driver of SD card as well as image creating program are realized in c language.The logic circuits can be simulated in quartus II and modelsim, the test is resorted to signaltap to ensure the robustness of the system.The rate of acquisition can reach to 60 frames by per second,The rate of SD storage can reach to 3.7 frames by per second,The simulation response time of motion detecion can reach at 120ms.the percent of detection refusal is smaller than 1%.Due to the main circuit being integrated into a FPGA chip, the system is characteristic of high integration, robustness and flexibility .Because of its low power dissipation ans small size,it can replace the conventional PC-baseed surveillance solution in many field.