用二次触发法改进接触式传感器线阵相机的曝光性能

罗颖; 谭沛岩; 刘霖; 叶玉堂; 刘永

doi:10.3788/OPE.20142202.0245

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用二次触发法改进接触式传感器线阵相机的曝光性能

现代应用光学 | 更新时间：2020-08-13

- 用二次触发法改进接触式传感器线阵相机的曝光性能
- Improvement of exposure performance of linear array CIS camera by twotrigger method
- 光学精密工程 2014年22卷第2期页码：245-251
- 作者机构：
  
  1. 电子科技大学现代光电测控及仪器实验室摩米实验室,四川成都,610054
  2. 成都术有科技有限公司,四川成都,610054
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20142202.0245
  中图分类号： TB853.29
- 收稿日期：2013-07-26，
  
  纸质出版日期：2014-02-20
- 稿件说明：
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罗颖,谭沛岩,刘霖等. 用二次触发法改进接触式传感器线阵相机的曝光性能[J]. 光学精密工程, 2014,22(2): 245-251

LUO Ying, TAN Pei-yan, LIU Lin etc. Improvement of exposure performance of linear array CIS camera by twotrigger method[J]. Editorial Office of Optics and Precision Engineering, 2014,22(2): 245-251
罗颖,谭沛岩,刘霖等. 用二次触发法改进接触式传感器线阵相机的曝光性能[J]. 光学精密工程, 2014,22(2): 245-251 DOI： 10.3788/OPE.20142202.0245.

LUO Ying, TAN Pei-yan, LIU Lin etc. Improvement of exposure performance of linear array CIS camera by twotrigger method[J]. Editorial Office of Optics and Precision Engineering, 2014,22(2): 245-251 DOI： 10.3788/OPE.20142202.0245.

摘要

针对外触发接触式图像传感器(CIS)线阵相机的扫描图像灰度值受外触发信号频率变化影响的问题

提出了一种新的曝光控制方法——二次触发法。首先

分析了外触发信号频率变化对图像灰度值影响的原因。然后

介绍了二次触发法:该方法将一个外触发信号转变为两次触发信号

第一次触发信号用于控制曝光

第二次触发信号用于控制CIS输出数据。最后

从理论上说明了该方法可以提升图像质量。将该方法成功应用于1.6 m长线阵零畸变CIS相机

实验结果表明:在不同的触发频率下

扫描图像的灰度值波动范围减小了75%

消除了图像上的横条纹。在智能视觉十字绣数码喷印机的应用上

绣布上1 mm×1 mm的孔成像清晰、灰度值均匀。提出的方法有效地解决了外触发信号频率影响图像质量的问题

成功地提高了图像的质量。

Abstract

As the frequency changing of external trigger signal from an external trigger Contact Image Sensor( CIS) camera will cause the nonuniform of a scanned image gray value

a new exposure method——two-trigger method was proposed. First

the reason that the frequency changing of external trigger signal affects the image gray value was analyzed. Then

the two-trigger method was introduced. With the method

an external trigger signal was converted to two trigger signals

the first one was used to control the exposure and the second one was used to control the CIS to output data. Finally

it explained that the method can improve the image quality theoretically. A 1.6 meter non-distortion long-term array CIS camera was fabricated based on this method. The experimental results show that the fluctuation range of scanned image gray value is reduced by 75%

and the horizontal stripes on the image is eliminated at different trigger frequencies. When it is applied to an intelligent vision stitch digital printing machine

the image of 1 mm×1 mm hole in the embroidered cloth is clear. It concludes that the proposed method reduces the effect of the frequency changing of external trigger signal on images effectively and improves the image quality successfully.

关键词

Keywords

references

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