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《Opto-electronic Engineering》 2003-05
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A Depth from Defocus Auto-Focusing Method Based on Frequency Analysis

PEI Xi-yu, FENG Hua-jun, LI Qi, XU Zhi-hai (State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China)  
A depth from defocus of target is calculated through calculating the radial distributions of frequency spectra of 2 frames of image with different defocusing positions, thus adjusts the lens position and finishes auto-focusing. The algorithm is suitable for any target. It is based on frequency spectrum but the frequency spectrum of a defocusing image is not needed to calculate. The algorithm accuracy can be as high as 4% and its robustness is good.
【CateGory Index】: TN911.73
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