Image focusing system based on FPGA

According to the research of the image focusing model based on Power Spectrum, this paper puts forward the implementation of an auto-focusing system based on FPGA, mainly including image preprocessing, definition evaluation and focusing control. Considering the computational complexity of the auto-focusing algorithms, a series of methods are used. That is, the image preprocessing method of combining the median filter and the gray value linear transformation, the pipelining work, the “Ping-Pong” operation, the double butterfly processor multiplex, the FFT algorithm of base 2 and so on. The research shows that utilizing the FPGA's powerful ability of parallel and high speed data processing can make the implementation of image focusing arithmetic become the speed bottleneck of the complex control system no longer.