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In the process of image acquisition, compression, transmission and reception, it will be affected by impulse noise, which will cause interference to subsequent edge detection, image segmentation or target recognition. Traditional median filtering converts the RGB components of the image to YCBCR components for filtering. This conversion method will lose a certain amount of chrominance information, and the color information is not completely separated, resulting in a color shift in the filtered image. To solve the above problems, the I and S color components in the HSI color space are used to detect the salt and pepper noise, and the adaptive median filter is used to filter the salt and pepper noise. The image reduction is higher. The algorithm is hardware accelerated by FPGA. The system runs at 222MHz on the xc7a100tfgg484-2 chip, which can realize real-time processing of 2k@60Hz video.