Information Sciences Auto-exposure for CCD camera based on FPGA

HUANG Hui; ZHOU Jin

doi:10.3788/OPE.20142202.0426

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Information Sciences Auto-exposure for CCD camera based on FPGA

Information Sciences | 更新时间：2020-08-13

- Information Sciences Auto-exposure for CCD camera based on FPGA
- Optics and Precision Engineering Vol. 22, Issue 2, Pages: 426-433(2014)
- 作者机构：
  
  1. 中国科学院大学北京,中国,100049
  2. 中国科学院光电技术研究所,四川成都,610209
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20142202.0426
  CLC： V447.3
- Received：19 June 2013，
  
  Published：20 February 2014
- 稿件说明：
移动端阅览
黄辉,周进,. 基于现场可编程门阵列的CCD相机自动调光[J]. 光学精密工程, 2014,22(2): 426-433

HUANG Hui, ZHOU Jin,. Information Sciences Auto-exposure for CCD camera based on FPGA[J]. Editorial Office of Optics and Precision Engineering, 2014,22(2): 426-433
黄辉,周进,. 基于现场可编程门阵列的CCD相机自动调光[J]. 光学精密工程, 2014,22(2): 426-433 DOI： 10.3788/OPE.20142202.0426.

HUANG Hui, ZHOU Jin,. Information Sciences Auto-exposure for CCD camera based on FPGA[J]. Editorial Office of Optics and Precision Engineering, 2014,22(2): 426-433 DOI： 10.3788/OPE.20142202.0426.

摘要

针对CCD相机在一些特殊场合成像时遇到的前后两帧图像场景不一致、应用环境多样性等问题

提出了一种基于图像直方图统计和分块均值的自动调光算法。该算法首先分析一帧图像的亮度分布

并计算出下一帧图像的最佳均值。然后根据该均值调整下一帧图像的曝光量

使其合理曝光。实验结果表明

利用此方法可以获得整体亮度合适的图像。在统计直方图后

计算最佳均值只需利用到直方图和几个均值

与图像本身的大小没有关系

所以计算量非常小;在像素时钟为60 MHz时

每次计算时间为6 μs。另外

此方法具备较好的场景适应能力

满足场景时刻变化时CCD相机自动调光以及实时性的要求。

Abstract

As CCD camera may image in different scenes and changed scenes in some special applications

an effective automatic exposure algorithm is proposed based on image histogram statistics and image mean blocking. Firstly

it analyzes the luminance distribution of image one and calculates the optimal mean of the next image. Then

it adjusts the exposure value of the next image based on the optimal mean to gain the image with rational exposure. The experimental results show that the method can obtain an image with appropriate brightness. After accounting the histogram

the algorithm has less calculation

which is dependent on the histogram and some means and nothing on the image sizes. When the pixel clock is 60 MHz

the calculating time just needs 6 μs.Moreover

it not only has a good capability to different scenes

but also can meet the requirements of the CCD camera for automatic exposure in real time at changed scenes.

关键词

Keywords

references

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刘志国,刘晶红.CCD可见光摄像机调光方法研究[J].液晶与显示,2011,26(2):250-254.

LIU ZH G, LIU J H. Automatic exposure algorithm for airborne visible light camera [J]. Chinese Journal of Liquid Crystals and Displays, 2011,26(2):250-254. (in Chinese)

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朱宏殷.星上成像均匀性及实时自动调光的研究 [D]. 长春:中国科学院长春光学精密机械与物理研究所,2012.

ZHU H Y. Research on imaging uniformity and real-time automatic exposure of remote sensing camera [D].Changchun: Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences,2012. (in Chinese)

周杰.基于多区域分割及模糊逻辑的自动曝光方法 [D].上海:上海交通大学,2007.

ZHOU J. Auto-exposure method based on image segmentations and fuzzy logic [D].Shanghai: Shanghai JiaoTong University,2007.(in Chinese)

张雷,丁亚林,张洪文,等.基于单帘快门的数字相机调光系统[J].光学精密工程,2013,21(5):1265-1271.

ZHANG L,DING Y L,ZHANG H W,et al..Adjustable exposure system for digital camera based on single curtain type shutter[J].Opt. Precision Eng.,2013,21(5):1265-1271.(in Chinese)

VITEK S,HOZMAN J. Image quality inflenced by selected image sersor parmeters [J]. Proceedings of SPIE on Photonics, Devices, and Systems II, Proceedings of SPIE,2003,5036.

SIMON SCHULZ, MARCUS GRIMM. Using brightness histogram to perform optimum auto exposure [J]. WSEAS Transactions on System and Control, ISSN: 2007,1991-8763.

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