In this paper, we propose a technique to design mosaic clor filters on single-chip CCD of electronic endoscope to improve the color reproduction. In a previous paper, we have reported a color reproduction method based on the estimation of reflectiance spectra. The reflectance spectra were estimated using R, G, B values and three basis functions. The R, G, B values were obtained using the rotating color wheel composed of R, G. Bfilters. On the other hand, the images obtained from single-chip CCD with color filter array have an interpolation error. They cause the degradation of spatial information th the estimated RGB image. In this research, we calculated spatial frequency distribution of the reflectance spectra in each optical wavelength, then we found that it has marhed characteristic. In optimizing the spectral transmittance of the color filters, this characteristic and the interpolation error are used in the cost function of the nonlinear optimization technique.
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