Signal processing device for biological observation apparatus

A biological observation apparatus photoelectrically converting light reflected from a living body based on illumination light irradiated to the living body that is a test subject, controlling an operation of an image pickup unit creating an image pickup signal in a wide band, and outputting the image pickup signal to a display device, the biological observation apparatus comprising:

• a spectral signal creating section for creating a first spectral signal corresponding to when illumination or image pickup is performed in a wavelength band centered on a range from 400 nm to 440 nm and a second spectral signal corresponding to when illumination or image pickup is performed in a wavelength band centered on a range from 520 nm to 560 nm by performing computation processing using a predetermined coefficient for spectral signal creation corresponding to an image in a narrow band of an optical wavelength based on the image pickup signal;
• a color adjusting section for adjusting a color tone for each of a plurality of wavelength bands for forming the spectral signal when outputting the spectral signal to the display device, the color adjusting section configured to output the first spectral signal corresponding to when illumination or image pickup is performed in the wavelength band centered on 400 nm to 440 nm to B and G channels of the display device and to output the second spectral signal corresponding to when illumination or image pickup is performed in the wavelength band centered on 520 nm to 560 nm to an R channel of the display device;
• and
• a plurality of light sources for emitting a plurality of illumination lights differing in spectral characteristic from each other as the illumination light.