Patent ID: 8279275

Claim:
A signal processing device for a biological observation apparatus comprising a signal processing control unit for photoelectrically converting light reflected from a living body that is a test subject based on illumination light from an illumination unit that irradiates light to the living body, controlling an operation of an image pickup unit creating an image pickup signal, and outputting the image pickup signal to a display device, the signal processing device 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; and a color adjusting section for adjusting a color tone for each of a plurality of wavelength bands 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 the range from 400 nm to 440 nm to B and G channels of the display device, and to output the second spectral signal corresponding to the when illumination or image pickup is performed in the wavelength band centered on the range from 520 nm to 560 nm to an R channel of the display device.