In order to solve the problem of blurred details and low contrast between the target and the background in infrared images,an infrared image clearing system based on FPGA was designed and implemented.The input original infrared image was smoothed with 8×8 windows,and then the filtered image was enhanced by Laplacian operator,thereby avoiding the noise amplification caused by traditional Laplacian enhancement.Moreover,the grayscale of enhanced image was adjusted through the Gamma correction curve.The serial and parallel pipeline calculation method was adopted in infrared image clearing hardware system;so that,the hardware system could work with an estimated frequency of 228 MHz by occupying only 2 % of slice register and 5 % of LUT resources,which can meet the requirements of real-time application of video images.The results verified that the system could effectively improve the contrast of the image and enhance the target details.