Image Registration for a Multispectral Imaging System Using Interference Filters and Application to Digital Archiving of Art Paintings
Keywords:Interference filter, Spectral imaging, Misregistration, Calibration, Phase-only correlation, Digital archiving
The present paper proposes a calibration method of a multispectral imaging system using interference filters. A multispectral imaging with interference filter is effective to acquire the inherent information of an object surface. However, in the imaging system using interference filters, the problem of misregistration is caused by longitudinal aberration or transverse aberration, where image position is slightly different between each captured image with the interference filters. We present a calibration method for correcting the observed images. The captured images are transformed into frequency domain, where the phase correlation between the Fourier-transformed images for different channels is maximized so as to compensate the misregistration. As a practical use, we describe the application to digital archive of paintings based the present imaging system. The surface properties such as surface-spectral reflectance and surface normal are estimated using the multichannel images.
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