Abstract: Various noises introduced in the process of image generation and acquisition will deteriorate the image quality. In order to realize the real-time preprocessing of images, the basic principle and algorithm of the median filter are first introduced. Then, a fast real-time median filter is designed based on the root-radix algorithm of the median filter on the field programmable gate array (FPGA) using the pipeline technology. A method for storing the first two lines of image data during the process of line-by-line output image processing is given. The simulation results show that the median filter can complete the preprocessing of the CCD output image in real time, achieving the purpose of suppressing noise and maintaining image details. [Author Abstract]
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