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Edge detection technology is an important part of digital image processing, which is widely used in target matching, traffic control and homeland security, it is of prime importance to realize accurate and efficient image edge detection of further imaging processing and image recognition. The system realized real time image edge detection based on FPGA and Sobel algorithm, pipelining and parallel processing was used in hardware, which improved the speed of image processing. Sobel algorithm was used as image edge detection algorithm, it simplifies the operation and improves the detection effect. Experiment results show that the system designed in this paper can achieve real time image edge detection effectively, meanwhile, this system improves the speed of imaging processing, it can meet the needs of further imaging processing.