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5 September 2002 Autofocusing system based on signal processing of single chip microprocessor
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In this paper, an auto-focusing system based on Signal Processing of Single-chip Microprocessor is introduced to realize auto-focusing. The system can automatically get the distance information of the worktable and drive the step motor to reach the aim of auto-focusing. The auto-focusing system is loaded in the original CMOS-based measuring system. After the AV signals from CMOS image sensor pass through the analog filter, the single-chip microprocessor samples and processes them, then controls the lens to be in focus. As a result, this method can not only achieve all functions of focusing, but also avoid complicated calculations. The system is low power consuming, programming rapidly. Here we analyse the key technique of the system and the results of the experiments are given. It can be practical applied and the further perfection of algorithm and software will result in the system having more function.
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Xiangdong Xu, Chao Zeng, Feng Li, and GuiZao Huang "Autofocusing system based on signal processing of single chip microprocessor", Proc. SPIE 4921, Optical Manufacturing Technologies, (5 September 2002);

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