Application of zoom tracking curves in focusing

LUO Jun; SUN Li; MIN Zhi-sheng

doi:10.3788/OPE.20111910.2326

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Application of zoom tracking curves in focusing

Article | 更新时间：2020-08-12

- Application of zoom tracking curves in focusing
- Optics and Precision Engineering Vol. 19, Issue 10, Pages: 2326-2332(2011)
- 作者机构：
  
  重庆大学光电技术及系统教育部重点实验室重庆,400030
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20111910.2326
  CLC： TB853.1
- Received：01 March 2011，
  
  Revised：02 April 2011，
  
  Published Online：27 October 2011，
  
  Published：25 October 2011
- 稿件说明：
移动端阅览
罗钧, 孙力, 闵志盛. 变焦跟踪曲线在对焦中的应用[J]. 光学精密工程, 2011,19(10): 2326-2332

LUO Jun, SUN Li, MIN Zhi-sheng . Application of zoom tracking curves in focusing[J]. Editorial Office of Optics and Precision Engineering, 2011,19(10): 2326-2332
罗钧, 孙力, 闵志盛. 变焦跟踪曲线在对焦中的应用[J]. 光学精密工程, 2011,19(10): 2326-2332 DOI： 10.3788/OPE.20111910.2326.

LUO Jun, SUN Li, MIN Zhi-sheng . Application of zoom tracking curves in focusing[J]. Editorial Office of Optics and Precision Engineering, 2011,19(10): 2326-2332 DOI： 10.3788/OPE.20111910.2326.

摘要

在变焦成像系统中

及时准确地获取跟踪曲线是变焦跟踪的关键

因此

本文提出了一种计算变焦跟踪曲线的策略。首先

采用基于RAW格式图像的梯度算子计算实时图像清晰度;然后

拟合记录的变焦电机和对焦电机的位置关系

得到远物距端和近物距端的两条跟踪曲线

构成变焦跟踪曲线的上下边界;最后

结合几何法和自适应法

应用获取的变焦跟踪曲线上下边界

计算得到系统所处物距下的跟踪曲线。在自主开发的变焦成像系统中采用梯度算子获取了变焦曲线的上下边界

并通过上述策略实现了变焦跟踪

得到了变焦过程中的图像。实验结果表明

使用所述算法的变焦成像系统其图像清晰度比只用自动对焦算法提高了30%以上;将变焦跟踪曲线应用在对焦中

能够提高变焦过程的图像对焦质量。

Abstract

It is most critical to acquire exact trace curves in time for realizing the zoom tracking in zoom imaging systems. Therefore

a novel computation strategy for zoom tracking curves is proposed. First

a real-time in-focus point is computed by using an image sharpness evaluation operator based on RAW format. Then

the position relations between zoom motor and focus motor are fitted to acquire the two trace curves at the near end and far end of object distances

which are regarded as the upper and lower bounds of trace curves. Finally

both geometric and adaptive zoom tracking methods are combined to be a hybrid algorithm to acquire the curves at some object distances by the method of interpolation. The trace curves for upper and lower bounds are obtained by a gradient operator on a self-developed zoom imaging system

zoom tracking is implemented with acquired trace curves and the image during zoom tracing is acquired. The obtained results show that the image quality of imaging system using proposed approach is improved by 30% as compared with that of the traditional system.It demonstrates that zoom tracking curves can be applied in focusing

and the image quality is improved dur- ing zoom tracing.

关键词

Keywords

references

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