A fuzzy reasoning processor for the autofocusing operation of a camera has been developed. The automatic focus is performed by evaluating the object distance and luminance. The object distance is measured by the beams of infrared light. The adequate contrast of object contours is evaluated by the image luminance. The proposed fuzzy reasoning processor can efficiently determine a good focusing point and its computation power can reach 3.75 million fuzzy logic inferences per second at a system clock of 30 MHz.
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