Electronic endoscope

An electronic endoscope comprising:

• a video-scope that has a first image sensor and a second image sensor;
• a light supplier that selectively irradiates white light and excitation-light on an observed portion;
• a first color filter that is positioned on said first image sensor, is disposed along a light-path oriented toward said first image sensor, and has spectral transmitting characteristics that transmit light having a first wavelength range corresponding to blue color;
• a second color filter that is positioned on said second image sensor, is disposed along a light-path oriented toward said second image sensor, and has spectral transmitting characteristics that transmit light having a second wavelength range corresponding to green and red colors;
• a first signal processor that generates normal image video signals corresponding to a normal observation image on the basis of image-pixel signals that are read from said first and second image sensors by the white light;
• a second signal processor that generates narrow-band video signals corresponding to a narrow-band image on the basis of image-pixel signals that are read from said first image sensor by reflected light of the excitation-light;
• and
• a third signal processor that generates auto-fluorescent video signals corresponding to an auto-fluorescent image on the basis of image-pixel signals that are read from said second image sensor by auto-fluorescent light emitted from the observed portion.