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Real-time implementation of autofocus on the TI DSC processor

This paper discusses the real-time implementation of a fast and accurate auto-focus method on the Texas Instruments DM270, a programmable processor designed specifically for digital still cameras. The DM270's programmable auto-focus hardware filter is utilized to obtain a sharpness function from a captured image. This function is then used to drive a rule-based search algorithm, which varies the focusing step size depending on the slope of the sharpness function. This leads to faster focusing speeds as compared to the standard global search algorithm. A wide variety of filters are tested by examining their performances in terms of focusing accuracy. The results show that the filters approximating the first derivative operator generate the best focusing accuracy under various focusing conditions.