Auto-focusing method of push-broom hyperspectral camera

Gui-hua WEI; Zhi-zhong ZHENG

doi:10.3788/OPE.20192702.0450

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Auto-focusing method of push-broom hyperspectral camera

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

- Auto-focusing method of push-broom hyperspectral camera
- Optics and Precision Engineering Vol. 27, Issue 2, Pages: 450-457(2019)
- 作者机构：
  
  1.南京理工大学计算机科学与工程学院，南京 210000
  2.江苏省光谱成像与智能感知重点实验室，南京 210000
  3.南京航空航天大学，南京 210000
  4.中国地质调查局南京地质调查中心，南京 210000
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20192702.0450
  CLC： V445.8
- Received：16 July 2018，
  
  Accepted：29 September 2018，
  
  Published：15 February 2019
- 稿件说明：
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Gui-hua WEI, Zhi-zhong ZHENG. Auto-focusing method of push-broom hyperspectral camera[J]. Optics and precision engineering, 2019, 27(2): 450-457.
DOI：

Gui-hua WEI, Zhi-zhong ZHENG. Auto-focusing method of push-broom hyperspectral camera[J]. Optics and precision engineering, 2019, 27(2): 450-457. DOI： 10.3788/OPE.20192702.0450.

摘要

自动调焦方法已被广泛应用到各种光学仪器中。为了解决推扫式高光谱相机自动调焦问题，提出了一种利用基于四元数小波变换的光谱质量评价函数估计相机焦距的方法。首先将推扫线上单行光谱数据顺序排列成一个二维矩阵，利用四元数小波变换对光谱像元矩阵进行分解得到低频和高频4个子带。通过对低频和高频的幅值和相位信息构造光谱质量评价函数，指导相机自动调焦。调焦过程中，利用自动调焦机构按一定步长旋转镜头，计算不同离焦状态下的光谱质量指标值，拟合光谱质量指标值与镜头伸缩量之间的高斯分布函数，最终估算最佳调焦量。实验表明，提出的光谱质量评价函数灵敏度高、准确度强。该调焦方法仅利用单行光谱数据进行调焦，调焦准确。

Abstract

The auto-focusing method has been widely incorporated in various optical instruments. To address the issue of auto-focusing for push-broom hyperspectral cameras

a method was proposed for estimating the optimal focus of a camera by employing a spectral quality evaluation function based on quaternion wavelet transform. A single line spectral data of the push sweep line was transformed into a two-dimensional matrix

and the matrix was subsequently decomposed into four low frequency and high frequency sub-bands. The spectral quality evaluation function was developed by incorporating the low frequency and high frequency amplitude and phase information for realizing the auto-focus feature. During the focusing process

the spectral quality metrics were calculated for different foci by rotating the lens at a certain stride length through an auto-focus mechanism. A Gaussian distribution function was fit between the spectral quality metrics and the extent of lens expansion and contraction

and the optimal focus was thereby estimated. Obtained results indicate that the proposed spectral quality evaluation function has superior sensitivity and accuracy. Furthermore

the proposed auto-focus method has superior accuracy owing to the usage of a single line of spectral data for focusing.

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Keywords

references

SHEN H L, ZHENG Z H, WANG W, et al .. Autofocus for multispectral camera using focus symmetry [J]. Applied Optics , 2012, 51(14): 2616.

卢振华.推扫式遥感相机基于图像的实时自动调焦研究[D].长春: 中国科学院研究生院(长春光学精密机械与物理研究所), 2012. http://cdmd.cnki.com.cn/Article/CDMD-80139-1012397774.htm

LU ZH H. The Automatic Image-based Real-time Focusing Research in Pushbroom Remote Sensing Camera [D]. Changchun: Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 2012. (in Chinese)

安源, 齐迎春.空间相机直线调焦机构的设计[J].光学精密工程, 2009, 17(3): 609-614.

AN Y, QI Y CH. Design of straight-line focusing mechanism for space camera [J]. Opt. Precision Eng ., 2009, 17(3): 609-614. (in Chinese)

HIROKI S, OSAMU H. Theoretical study on self-calibration for the wide-range laser auto-collimation method [J]. Key Engineering Materials , 2008, 381-382: 271-274.

吴昊, 张涛, 张振, 等.单幅图像估计离焦量的航空摄像机自动调焦系统[J].液晶与显示, 2016, 31(5): 484-490.

WU H, ZHANG T, ZHANG ZH, et al .. System of aerial camera auto-focus based on defocus estimate by single image [J]. Chinese Journal of Liquid Crystals and Displays , 2016, 31(5): 484-490. (in Chinese)

NINDL D, LIENHART W. Telescope for use in a measuring instrument and method of automated auto-collimation of a telescope of a measuring instrument with an auto-collimation target [P]. EUR: EP 2461132 A1, 2012.

苑嘉辉, 蔡洪波, 刘奇, 等.广角望远镜实时自动调焦的清晰度评价方法[J].光学精密工程, 2017, 25(5): 1368-1377.

YUAN J H, CAI H B, LIU Q, et al .. Definition evaluation method for real-time auto-focusing of wide-angle telescope [J]. Opt. Precision Eng , 2017, 25(5): 1368-1377. (in Chinese)

AUGUSTYN A T. The KS-146A long range oblique photography (LOROP) camera system [C]. Technical Symposium , 1981: 76-85. https://www.researchgate.net/publication/271486222_The_KS-146A_Long_Range_Oblique_Photography_LOROP_Camera_System

RUCK A R. Design versatility of the prism panoramic camera: the KS-116 and KA-95 cameras [C]. 25th Annual Technical Symposium. International Society for Optics and Photonics , 1981: 69-75. http://adsabs.harvard.edu/abs/1981SPIE..309...69R

王治文, 罗晓清, 张战成.基于四元数小波变换的清晰度评价[J].计算机应用, 2016, 36(7): 1927-1932+1937.

WANG ZH W, LUO X Q, ZHANG ZH CH. Quaternion wavelet transform for evaluation of image sharpness [J]. Journal of Computer Application , 2016, 36(7): 1927-1932+1937. (in Chinese)

王宇庆, 朱明.评价彩色图像质量的四元数矩阵最大奇异值方法[J].光学精密工程, 2013, 21(2): 469-478.

WANG Y Q, ZHU M. Maximum singular value method of quaternion matrix for evaluating color image quality[J]. Opt. Precision Eng ., 2013, 21(2): 469-478. (in Chinese)

SANOJ K, SANJEEV K, NAGARAJAN S, et al .. Dual tree fractional quaternion wavelet transform for disparity estimation [J]. ISA Transactions , 2014, 53(2): 547-559.

PETER F, STEPHEN J S. The development of the quaternion wavelet transform [J]. Signal Processing , 2016, 136.

范赐恩, 冉杰文, 颜佳, 等.颜色空间统计联合纹理特征的无参考图像质量评价[J].光学精密工程, 2018, 26(4): 916-926.

FAN C E, RAN J W, YAN J, et al .. No-reference image quality assessment using joint color space statistical and texture feature [J]. Opt. Precision Eng ., 2018, 26(4): 916-926. (in Chinese)

SAAD M A, BOVIK A C, CHARRIER C. Blind image quality assessment: a natural scene statistics approach in the DCT domain [J]. IEEE Transactions on Image Processing , 2012, 21(8): 3339-3352.

LIU L, LIU B, HUANG H, et al .. No-reference image quality assessment based on spatial and spectral entropies [J]. Signal Processing Image Communication , 2014, 29(8): 856-863.

MITTAL A, MOORTHY A K, BOVIK A C. No-reference image quality assessment in the spatial domain [J]. IEEE Transactions on Image Processing A Publication of the IEEE Signal Processing Society , 2012, 21(12): 4695.

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