Regularized learning framework in the estimation of reflectance spectra from camera responses |
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Authors: | Heikkinen Ville Jetsu Tuija Parkkinen Jussi Hauta-Kasari Markku Jaaskelainen Timo Lee Seong Deok |
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Affiliation: | InFotonics Center, University of Joensuu, Finland. villehe@cc.joensuu.fi |
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Abstract: | For digital cameras, device-dependent pixel values describe the camera's response to the incoming spectrum of light. We convert device-dependent RGB values to device- and illuminant-independent reflectance spectra. Simple regularization methods with widely used polynomial modeling provide an efficient approach for this conversion. We also introduce a more general framework for spectral estimation: regularized least-squares regression in reproducing kernel Hilbert spaces (RKHS). Obtained results show that the regularization framework provides an efficient approach for enhancing the generalization properties of the models. |
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