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嵌入式自动聚焦摄像模组控制系统的设计
引用本文:马建设,李合银,程雪岷,林家用,张志清.嵌入式自动聚焦摄像模组控制系统的设计[J].光学精密工程,2012,20(10):2222-2228.
作者姓名:马建设  李合银  程雪岷  林家用  张志清
作者单位:清华大学深圳研究生院光盘国家工程研究中心深圳分中心,广东深圳,518055
基金项目:国家自然科学基金资助项目(No.61275003,No.60808015);粤港关键领域重点突破项目(No.200920522800017, 2007A010301004);深圳市基础研究计划资助项目(No.JC201005310719A)
摘    要:针对手机等移动终端设备中的摄像模组,提出了一种嵌入式自动聚焦控制系统。该系统以AD5820作为聚焦电机的驱动IC,以OV5642作为图像传感器,利用68013单片机进行数据处理并控制驱动IC调整镜头的位置,完成准确自动聚焦。系统通过控制音圈电机带动镜头行程变位,获取一系列图像;计算每幅图像清晰度评价值构成清晰度评价曲线;采用梯度函数作为图像清晰度评价标准;并用全程搜索的方式找到图像清晰度最大值时镜头的位置,从而达到聚焦的目的。实验验证显示,系统的聚焦分辨率能达到5~10μm,响应速度小于70ms。自动聚焦实物拍摄图像清晰,能够很好地满足摄像模组自动聚焦的需求。

关 键 词:驱动IC  图像传感器  摄像模组  自动聚焦  清晰度
收稿时间:2012/4/17

Control system for embedded auto-focusing camera module
MA Jian-she , LI He-yin , CHENG Xue-min , LIN Jia-yong , ZHANG Zhi-qing.Control system for embedded auto-focusing camera module[J].Optics and Precision Engineering,2012,20(10):2222-2228.
Authors:MA Jian-she  LI He-yin  CHENG Xue-min  LIN Jia-yong  ZHANG Zhi-qing
Affiliation:(Shenzhen Branch Center,Optical Memory National Engineering Research Center, Graduate School at Shenzhen,Tsinghua University,Shenzhen 518055,China)
Abstract:A control system for embedded auto-focusing camera modules is proposed for mobile phones and other mobile devices.For the purpose of accurate auto-focusing,the system makes use of an AD5820 as the driver IC for a focusing motor, the OV5642 as an image sensor,and the 68013 microcomputer unit as the data processing and controlling driver IC for lens position adjustment.In auto focusing,the system obtains a series of clear images through controlling a voice coil motor to change lens positions at first,and a focusing evaluation curve is formed through calculating the definition evaluation for each image.Then, the image definition is evaluated by using gradient function as evaluation standard,and the lens position is found by the full search when the image definition comes to the maximum value.According to the experiment,the system can offer the focusing resolutions of 5~10 μm and response time less than 70 ms,which shows that the system has good automatic focusing performance,and can satisfy the requirements of automatic focusing system for the camera module.
Keywords:driver IC  image sensor  camera module  automatic focusing  definition
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