Endoscope apparatus for outputting signals corresponding to first and second narrowband wavelength bands

An endoscope apparatus comprising:

• an illumination section radiating at least one or more illumination lights having a predetermined wavelength band to a part under an epithelium of a living mucosa of a subject;
• an image pickup section picking up an image of a return light from the part under the epithelium of the living mucosa based on radiation of the illumination section;
• an image output section outputting a signal corresponding to a first wavelength band which is narrowband having a wavelength band within a range from a wavelength of 585 nm to a wavelength of 615 nm and a signal corresponding to a second wavelength band which is narrowband having a lower absorption coefficient of a hemoglobin absorption characteristic than an absorption coefficient of a hemoglobin absorption characteristic of the first wavelength band, the second wavelength band being a narrowband having a wavelength band in which a scattering characteristic of the living tissue is suppressed within a range from a wavelength of 610 nm to a wavelength of 730 nm, between a wavelength band including a maximum value and a wavelength band including a minimum value with regard to the hemoglobin absorption characteristic of the living tissue of the subject, after image pickup by the image pickup section;
• and
• a display section displaying an image on the basis of the signal corresponding to the first wavelength band and the signal corresponding to the second wavelength band,
• wherein the illumination section radiates the illumination light via a band limiting section limiting a wavelength band to the first wavelength band and the second wavelength band, and
• wherein the image output section outputs the signal corresponding to the first wavelength band and the signal corresponding to the second wavelength band on the basis of an image signal obtained by picking up an image of the return light by the image pickup section.