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Spatio-Spectral Modeling and Compensation of Transversal Chromatic Aberrations in Multispectral Imaging

机译：多光谱成像中横向色差的时空光谱建模和补偿

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摘要

In optical imaging systems, the wavelength-dependency of the refraction indices of lenses causes chromatic aberrations: electromagnetic radiation from an object point is dispersed in a rainbow-like manner on the sensor. These aberrations were so far only measured and modeled for up to three, often relatively wideband wavelength bands, such as R, G, and B. Moreover, no relation between the aberrations of these color channels was generally considered. The authors describe here the measurement of chromatic aberrations for multiple narrowband color channels in multispectral imaging. Existing models for transversal distortions are discussed and the wavelength-dependency of their parameters is analyzed. The models are extended with univariate wavelength-dependent polynomials, thus leading to bivariate models for both space and wavelength-dependency. The authors compare the models and confirm their validity qualitatively and quantitatively and simulate aberrations with state-of-the-art raytracing software. With their wavelength-dependent model, the distortions can be compensated even at wavelengths for which no measurements are available.
机译：在光学成像系统中，透镜折射率的波长依赖性会导致色差：来自对象点的电磁辐射以彩虹状的方式分散在传感器上。到目前为止，这些像差仅针对多达三个（通常是相对较宽的波段）波长（例如R，G和B）进行测量和建模。此外，通常不考虑这些颜色通道的像差之间的关系。作者在此描述了多光谱成像中多个窄带彩色通道的色差测量。讨论了现有的横向失真模型，并分析了其参数的波长依赖性。使用单变量依赖于波长的多项式扩展了模型，因此导致了空间和波长依赖的双变量模型。作者比较了这些模型，并使用最新的光线跟踪软件对它们进行了定性和定量的验证，并模拟了像差。利用其依赖于波长的模型，即使在没有可用测量值的波长下，也可以补偿失真。

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  • 来源
    《Journal of Imaging Science and Technology》 |2011年第6期|p.060502.1-060502.14|共14页
  • 作者

    Julie Klein; Johannes Brauers; Til Aach;

  • 作者单位

    Institute of Imaging & Computer Vision, RWTH Aachen University, Templergraben 55, D-52056 Aachen, Germany;

    Institute of Imaging & Computer Vision, RWTH Aachen University, Templergraben 55, D-52056 Aachen, Germany;

    Institute of Imaging & Computer Vision, RWTH Aachen University, Templergraben 55, D-52056 Aachen, Germany;

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