Auto-focusing and control of micro-vision system

ZHOU Li-ping; SUN Zhi-jun; ZHANG Quan

doi:10.3788/OPE.20132103.0807

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Auto-focusing and control of micro-vision system

更新时间：2020-08-12

- Auto-focusing and control of micro-vision system
- Optics and Precision Engineering Vol. 21, Issue 3, Pages: 807-812(2013)
- 作者机构：
  
  南京航空航天大学机械结构力学及控制国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20132103.0807
  CLC： TP391;TH742.9
- Received：24 August 2012，
  
  Revised：18 October 2012，
  
  Published Online：20 March 2013，
  
  Published：15 March 2013
- 稿件说明：
移动端阅览
周丽平孙志峻张泉. 显微视觉自动聚焦及控制策略[J]. 光学精密工程, 2013,21(3): 807-812

ZHOU Li-ping SUN Zhi-jun ZHANG Quan. Auto-focusing and control of micro-vision system[J]. Editorial Office of Optics and Precision Engineering, 2013,21(3): 807-812
周丽平孙志峻张泉. 显微视觉自动聚焦及控制策略[J]. 光学精密工程, 2013,21(3): 807-812 DOI： 10.3788/OPE.20132103.0807.

ZHOU Li-ping SUN Zhi-jun ZHANG Quan. Auto-focusing and control of micro-vision system[J]. Editorial Office of Optics and Precision Engineering, 2013,21(3): 807-812 DOI： 10.3788/OPE.20132103.0807.

摘要

对自动显微镜的自动聚焦评价函数及聚焦控制策略进行了研究。首先，介绍了频域聚焦函数提升小波变换及时域聚焦函数Sobel-Tenengrad算子，通过将提升小波变换和Sobel-Tenengrad算子有机组合提出了一种新型聚焦评价函数。然后，利用离焦、正焦样本图像对自组织算法进行无监督训练，使用粒子群优化算法加速训练过程，并以经过学习的自组织映射算法作为聚焦控制器。最后，进行了显微视觉自动聚焦实验。实验结果表明：新型组合算子具有单峰性，峰值处变化陡峭，对不同样本、不同倍数物镜均可在正焦位置达到最大值，鲁棒性强；经过学习控制器后平均仅用7.6步即可完成自动聚焦，与爬山法相比，该聚焦算法不仅大大提高了聚焦速度且性能稳定，对每幅输入图像处理、识别时间约为120 ms；满足了显微视觉自动聚焦要求，获得了良好聚焦效果。

Abstract

The auto-focusing evaluation function and a controller were researched based on an automated microscopy. At first

the Discrete Wavelet Transform (DWT) and Sobel-Tenengrad function were introduced

and a new auto-focusing evaluation function was proposed by combining the DWT with the Sobel-Tenengrad operator. Then

the defocused and focused sample pictures were used to train the Self-organizing Map (SOM) algorithm in a unsupervised method

and the Particle Swarm Optimization (PSO) was used to accelerate the training process. Finally

an auto-focusing experiment was carried out by using the trained SOM controller. The experimental results show that the new auto-focusing function has the characters of single steep peak and strong robustness to different samples and objective lenses. The results also indicate that the SOM based the controller only take 7.6 steps for auto-focusing process on average

and the focusing speed and stability has been greatly improved compared with that using the mountain climbing method. Moreover

it processes or recognizes the input image only for about 120 ms. The proposed method has met the requirements of auto-focusing of micro-vision system

and obtained good results.

关键词

Keywords

references

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