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The adoption and adaptation of digital signal processing technology in consumer digital cameras has improved the performance of automatic adjustments including Auto Focus (AF), Auto Exposure (AE) and zoom tracking, which are important features for high image quality, under various shot conditions. In a digital camera, optical parameters such as zoom, focus and aperture, are usually motor (computer) controlled. The zoom tracking is the continuous adjustment of a camera's focal length, to keep in-focus state of camera image during zoom operation.
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