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Realization of Auto-focusing Model in FPGA

By the preprocessing method of the integration with the median filter and the linear transform of gray value, and the evaluation function based on power spectrum, an auto-focusing model is built. From the character of the image focusing algorithm based on power spectrum, the paper has designed the structural frame and algorithm flow of the image processing module, and proposed the pipelining structure, the ‘Ping-Pong’ operating mode, the double butterfly-shaped processor multiplex, the base 2 FFT transform. Those increase the speed of the computations and responses in image auto-focus.