A signal processing system comprising: spectral signature characteristic of particular object acquisition means (114, 201) for performing an acquisition of a spectral signature characteristic of particular object based on spectral characteristics of an object of interest with spectral characteristics known; separation means for separating an image signal, which is composed of a plurality of color signals (B1, B2, G1, G2, R1, R2) obtained by a color imaging system provided for subjects including the object of interest, into image signals of a plurality of wavelength ranges based on the plurality of color signals, each wavelength range extending over a set of colors associated with the color signals; system spectral characteristics acquisition means (115, 201) for performing an acquisition of spectral characteristics of an image acquisition system including spectral characteristics concerning the color imaging system and spectral characteristics concerning illumination light used in image acquisition of subjects by the color imaging system; calculation means for calculating a weighting coefficient associated with the spectral signature characteristic of particular object for the each wavelength range, based on the image signals of the plurality of wavelength ranges separated by the separation means, the spectral signature characteristic of particular object acquired by the spectral signature characteristic of particular object acquisition means, and the spectral characteristics of the image acquisition system acquired by the system spectral characteristics acquisition means; and output signal calculation means (116, 117, 118, 119; 125, 126) for calculating an output signal as identification result of objects of interest with the spectral characteristics known, based on the weighting coefficient associated with spectral signature characteristic of particular object for the each wavelength range calculated in the calculation means, wherein the plurality of wavelength ranges comprises a short wavelength range relating to information concerning a surface layer of the object of interest and a long wavelength range relating to information concerning a deep layer of the object of interest, characterized in that the weighting coefficient for the short wavelength range and the weighting coefficient for the long wavelength range are calculated independently of each other. spectral signature characteristic of particular object acquisition means (114, 201) for performing an acquisition of a spectral signature characteristic of particular object based on spectral characteristics of an object of interest with spectral characteristics known; separation means for separating an image signal, which is composed of a plurality of color signals (B1, B2, G1, G2, R1, R2) obtained by a color imaging system provided for subjects including the object of interest, into image signals of a plurality of wavelength ranges based on the plurality of color signals, each wavelength range extending over a set of colors associated with the color signals; system spectral characteristics acquisition means (115, 201) for performing an acquisition of spectral characteristics of an image acquisition system including spectral characteristics concerning the color imaging system and spectral characteristics concerning illumination light used in image acquisition of subjects by the color imaging system; calculation means for calculating a weighting coefficient associated with the spectral signature characteristic of particular object for the each wavelength range, based on the image signals of the plurality of wavelength ranges separated by the separation means, the spectral signature characteristic of particular object acquired by the spectral signature characteristic of particular object acquisition means, and the spectral characteristics of the image acquisition system acquired by the system spectral characteristics acquisition means; and output signal calculation means (116, 117, 118, 119; 125, 126) for calculating an output signal as identification result of objects of interest with the spectral characteristics known, based on the weighting coefficient associated with spectral signature characteristic of particular object for the each wavelength range calculated in the calculation means, wherein the plurality of wavelength ranges comprises a short wavelength range relating to information concerning a surface layer of the object of interest and a long wavelength range relating to information concerning a deep layer of the object of interest, characterized in that the weighting coefficient for the short wavelength range and the weighting coefficient for the long wavelength range are calculated independently of each other.