Large field-of-view stitching with a single lens and its implementation

Xiang ZHANG; Xiang-yao XUE; Guang WANG; Ya-kun MA

doi:10.3788/OPE.20182606.1346

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Large field-of-view stitching with a single lens and its implementation

Modern Applied Optics | 更新时间：2020-07-05

- Large field-of-view stitching with a single lens and its implementation
- Optics and Precision Engineering Vol. 26, Issue 6, Pages: 1346-1353(2018)
- 作者机构：
  
  1.中国科学院长春光学精密机械与物理研究所, 吉林长春 130033
  2.中国科学院大学, 北京 100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20182606.1346
  CLC： TP394.1;TH691.9
- Received：25 October 2017，
  
  Accepted：07 December 2017，
  
  Published：25 June 2018
- 稿件说明：
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Xiang ZHANG, Xiang-yao XUE, Guang WANG, et al. Large field-of-view stitching with a single lens and its implementation[J]. Optics and precision engineering, 2018, 26(6): 1346-1353.
DOI：

Xiang ZHANG, Xiang-yao XUE, Guang WANG, et al. Large field-of-view stitching with a single lens and its implementation[J]. Optics and precision engineering, 2018, 26(6): 1346-1353. DOI： 10.3788/OPE.20182606.1346.

摘要

在远距离目标轨迹测量系统中，当前的长焦相机由于CCD尺寸限制一般视场角度较小，无法实现对目标的可靠捕获。在对比当前的几种大视场拼接成像方法后，针对远距离目标测量系统的要求提出了一种通过控制单个相机进行圆锥旋转来模拟4相机阵列实现大视场成像的方法。设计了实验样机对该方法进行验证。首先根据该成像方法设计了相机运动控制方案和相应的机械结构，然后设计了相机的触发控制以及图像数据的传输和处理流程，最后使用该样机进行了实验。实验中样机经校准后采集到了相对位置正确的子视场图像，并拼接获得了大视场图像。使用视场角度为1.02°的小视角相机，实现了4个有一定程度重合的子视场2×2拼接，最终获得了1.93°的大视角。该方法为远距离目标测量系统中的目标捕获子系统设计提供了新思路。

Abstract

In a remote target trajectory measurement system

the currently utilized telephoto cameras tend to have too small of a viewing angle to realize stable image capture of remote targets due to limitations of the CCD size. We aim to address the demands of such a system using a large Field-of-V iew (FoV) image collection method that uses a single camera to simulate a 4-camera array by performing a cone rotation. This approach was presented on the basis of a comparison with the current large field-of-view stitching methods. A prototype for testing was designed to verify the method. The camera motion control scheme and the corresponding mechanical structure were designed according to the image collection method. Then the camera trigger control and the image data transmission and processing flow were designed. Finally

an experiment with the prototype was performed. In the experiment

the prototype collected correct relative position sub-images after calibration and stitched them into a large FoV image. field stitching was realized using 4 sub-FoVs that were overlapped with each other to some degree. Finally

a large angle of view of 1.93° was obtained when using a camera with a small angle-of-view of only 1.02°. The proposed method provides a new idea for the design of the target capture sub-systems for a remote target measurement system.

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