Control system for embedded auto-focusing camera module

MA Jian-she; LI He-yin; CHENG Xue-min; LIN Jia-yong; ZHANG Zhi-qing

doi:10.3788/OPE.20122010.2222

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Control system for embedded auto-focusing camera module

Article | 更新时间：2020-08-12

- Control system for embedded auto-focusing camera module
- Optics and Precision Engineering Vol. 20, Issue 10, Pages: 2222-2228(2012)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20122010.2222
  CLC： TN929.5;TB853
- Received：17 April 2012，
  
  Revised：06 June 2012，
  
  Published：10 October 2012
- 稿件说明：
移动端阅览
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

MA Jian-she, LI He-yin, CHENG Xue-min, LIN Jia-yong, ZHANG Zhi-qing. Control system for embedded auto-focusing camera module[J]. Editorial Office of Optics and Precision Engineering, 2012,20(10): 2222-2228
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 DOI： 10.3788/OPE.20122010.2222.

MA Jian-she, LI He-yin, CHENG Xue-min, LIN Jia-yong, ZHANG Zhi-qing. Control system for embedded auto-focusing camera module[J]. Editorial Office of Optics and Precision Engineering, 2012,20(10): 2222-2228 DOI： 10.3788/OPE.20122010.2222.

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5~10

响应速度小于70 ms。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。

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

mm 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.

关键词

Keywords

references

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Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences

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