Abstract:According to the characteristics of weak small targets with imaging blurring and low contrast, this paper puts forward a new method of image enhancement, which first removals background noise and clutterwith the thresh old high pass filter, and then eliminates background and enhances targets through histogram equalization. At the same time, the paper describes the FPGA design and hardware imp lements, which is app licable to the real time system. The experimental result shows this method can effectively enhance weak small targets, and can also provides useful data for later target extraction with a strong engineering and application value.