Variational color transformation method for direct color imaging

Takahiro Saito; Takashi Komatsu

doi:10.1117/12.585199

23 February 2005 Variational color transformation method for direct color imaging

Takahiro Saito, Takashi Komatsu

Proceedings Volume 5678, Digital Photography; (2005) https://doi.org/10.1117/12.585199
Event: Electronic Imaging 2005, 2005, San Jose, California, United States

Abstract

As an imaging scheme with a single solid-state sensor, the direct color-imaging approach is considered promising. The sensor has photo-sensing layers more than two along its depth direction. Although each pixel has multiple color signals, their spectral sensitivities are overlapped with each other. The overlapped color signals should be transformed to color signals specified by an output device. We present a color transformation method for the direct color-imaging scheme. Our method tries to recover multi-spectral reflectance and then to transform colors by utilizing it. The problem is formulated as the inverse problem that multi-spectral reflectance with a large number of color channels are recovered from observed color signals with a smaller number of color channels, and solved by the regularization technique that minimizes the functional composed of a color-fidelity term and a spectral-regularity term. The color-fidelity term quantifies errors in linear transformation from multi-spectral reflectance to observed color signals; whereas the spectral-regularity term quantifies the property that spectral reflectance at a color channel is similar to those at its neighboring channels. We simulate the direct color-imaging scheme and our method. The results show that in the case of more than five photo-sensing layers our method restores multi-spectral reflectance satisfactorily.

Citation Download Citation

Takahiro Saito and Takashi Komatsu "Variational color transformation method for direct color imaging", Proc. SPIE 5678, Digital Photography, (23 February 2005); https://doi.org/10.1117/12.585199

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