The endoscope apparatus 1 is configured to irradiate a subject with at least one illumination light having a predetermined wavelength band, and to image return light from the subject based on irradiation of the light source device 4. It includes an element 2, a video processor 7 and an observation monitor 5. The band resolution processing unit 104 of the video processor 7 has a first spectral characteristic peak wavelength between the wavelength band including the maximum value and the wavelength band at the minimum value in the absorption characteristics of the living tissue after imaging by the imaging device 2. The image signal P1 is decomposed into a plurality of spatial frequency bands. The enhancement processing unit 101a of the video processor 7 generates an image signal that is enhanced and corrected by performing enhancement processing based on a band image signal having the lowest spatial frequency among a plurality of band image signals obtained by the decomposition processing. .内視鏡装置１は、被検体に対し、所定の波長帯域を有する少なくとも１つ以上の照明光を照射する光源装置４と、光源装置４の照射に基づく被検体からの戻り光を撮像する撮像素子２と、ビデオオプロセッサ７と、観察モニタ５とを含む。ビデオプロセッサ７の帯域分解処理部１０４は、撮像素子２による撮像後、生体組織の吸収特性において極大値を含む波長帯域から極小値における波長帯域の間で、分光特性のピーク波長を有する第１の画像信号P1に対して、複数の空間周波数帯域に分解処理を行う。ビデオプロセッサ７の強調処理部１０１ａは、分解処理されて得られた複数の帯域画像信号のうちの、最も空間周波数の低い帯域画像信号に基づいて、強調処理を行い強調補正した画像信号を生成する。
