Analysis of aberrations and pixel information in goniometric multispectral imaging

Julie Klein; Georg Schmücking

doi:10.1117/12.2036614

24 February 2014 Analysis of aberrations and pixel information in goniometric multispectral imaging

Julie Klein, Georg Schmücking

Proceedings Volume 9018, Measuring, Modeling, and Reproducing Material Appearance; 901806 (2014) https://doi.org/10.1117/12.2036614
Event: IS&T/SPIE Electronic Imaging, 2014, San Francisco, California, United States

Abstract

In goniometric measurements, the acquisition of a material under different viewing and illumination angles gives access to its bidirectional reflectance distribution function (BRDF). If information is acquired not only from a point of the material but from the whole object, the bidirectional texture function (BTF) can even be measured. Depending on the camera utilized, the color accuracy of acquired information can vary. A multispectral camera with 19 bandpass channels is utilized here to sample the visible wavelength range. We first measure the transversal aberrations appearing in goniometric multispectral imaging. They are caused by the bandpass filters in the ray path. Utilizing the information from all the viewing angles can lead to a better correction of these aberrations. We compare separate correction of each acquired image and global correction over the whole set of goniometric images. Furthermore, angles vary for different points of image in the camera because of the image optics. We analyze these variations which can either bring additional aberrations to the measurement or additional information about the measured material.

Citation Download Citation

Julie Klein and Georg Schmücking "Analysis of aberrations and pixel information in goniometric multispectral imaging", Proc. SPIE 9018, Measuring, Modeling, and Reproducing Material Appearance, 901806 (24 February 2014); https://doi.org/10.1117/12.2036614

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