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At present there are still many shortcomings in auto-focusing techniques used in digital imaging systems because of the complexity of imaging objects and conditions. Especially the problem that how to improve the auto-focusing velocity is far from completely solved because the contradiction between focusing speed and focusing precision. In this paper, a novel auto-focusing algorithm is proposed. The authors present a new measure of image focus based on lifting wavelet transform, which possesses the stable, highly sensitive characteristic curve preferring to small-scale accurate focusing.
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