Radiometric calibration of large area array color CCD aerial mapping camera

XIU Ji-hong; HUANG Pu; LI Jun; LI You-yi

doi:10.3788/OPE.20122006.1365

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Radiometric calibration of large area array color CCD aerial mapping camera

更新时间：2020-08-12

- Radiometric calibration of large area array color CCD aerial mapping camera
- Optics and Precision Engineering Vol. 20, Issue 6, Pages: 1365-1373(2012)
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所中国科学院航空光学成像与测量重点实验室,吉林长春,130033
  2. 中国科学院研究生院北京,100039
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20122006.1365
  CLC： V447.3;TN386.5
- Received：19 January 2012，
  
  Revised：15 February 2012，
  
  Published Online：10 June 2012，
  
  Published：10 June 2012
- 稿件说明：
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修吉宏, 黄浦, 李军, 李友一. 大面阵彩色CCD航测相机的辐射定标[J]. 光学精密工程, 2012,20(6): 1365-1373

XIU Ji-hong, HUANG Pu, LI Jun, LI You-yi. Radiometric calibration of large area array color CCD aerial mapping camera[J]. Editorial Office of Optics and Precision Engineering, 2012,20(6): 1365-1373
修吉宏, 黄浦, 李军, 李友一. 大面阵彩色CCD航测相机的辐射定标[J]. 光学精密工程, 2012,20(6): 1365-1373 DOI： 10.3788/OPE.20122006.1365.

XIU Ji-hong, HUANG Pu, LI Jun, LI You-yi. Radiometric calibration of large area array color CCD aerial mapping camera[J]. Editorial Office of Optics and Precision Engineering, 2012,20(6): 1365-1373 DOI： 10.3788/OPE.20122006.1365.

摘要

以大面阵彩色CCD航测相机为研究对象

分析其成像过程

提出了影响相机辐射响应特性的各个因素

并以此为基础

建立了辐射响应特性模型。分别在暗场和使用积分球的条件下进行了辐射响应标定实验

通过组合更改输入辐亮度、曝光时间和CCD增益等因素对相机的辐射响应特性进行测量和分析。结果表明

相机

R、G、B

颜色通道随输入辐亮度变化的辐射响应特性并不相同

但在工作谱段范围内均呈线性变化趋势。采用最小二乘法对辐射标定数据进行拟合

一次多项式拟合结果的决定系数

值均可达到0.999以上。当输入辐亮度不变时

相机输出图像灰度值随曝光时间或CCD增益的变化呈线性变化趋势

从而为其它工作条件下辐射响应特性曲线的推演奠定了理论基础。将相机辐射响应标定结果应用于相机调光功能

成像结果表明

获得的图像亮度适中

图像平均灰度值满足调光要求。

Abstract

Several kinds of factors affecting the radiometric calibration of a large area array color CCD aerial mapping camera were presented through analyzing the process of camera imaging. Then

a model for radiometric calibration was established. The experiments of radiometric calibration were performed by using integrating sphere and in the dark field

respectively

and outputs of radiometric response of the camera were measured and analyzed through combination of changing the input radiance

exposure time

CCD gain and other factors. The experimental results show that the characteristics of radiometric response for

and

color channels are different when the input radiance is changed

but it varies linearly in the working spectral range. When the least square method is used to fit the calibration data of radiation

the goodness of fit for first-order polynomial shows that the

is above 0.999. Furthermore

when input radiometric luminance is constant

the output of the camera varies linearly with the exposure time or CCD gain

which lays the theoretical basis for the deduction of radiation response characteristic curves under the other work conditions. The data from radiometric calibration is applied to the exposure parameters

and experimental results indicate that the lightness of image is appropriate and its average gray value satisfies the requirement for exposure.

关键词

Keywords

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