An endoscope apparatus according to the present invention includes a light source unit that emits white illumination light or narrowband illumination light, an image sensor that photoelectrically converts received light to generate an electrical signal, white illumination light observation, and narrowband illumination. A first filter that transmits light of a luminance component of light observation, a second filter that transmits light of a luminance component of white illumination light observation, a third filter that transmits light of a luminance component of narrowband illumination light observation, In the case of white illumination light, a color image signal is generated based on the luminance component of white illumination light observation, and in the case of narrow-band illumination light, the pixel value of the pixel corresponding to the second filter is And interpolating the pixel value of the luminance component of the white illumination light observation at the pixel position corresponding to the first filter, and the pixel value of the pixel corresponding to the first filter and the pixel value of the luminance component of the white illumination light observation Based on the first fill A demosaicing processing unit for generating a color image signal by interpolating the pixel values of the luminance component of the narrow band illumination light observation at the pixel position corresponding to, with.本発明にかかる内視鏡装置は、白色照明光または狭帯域照明光を出射する光源部と、受光した光を光電変換して電気信号を生成する撮像素子と、白色照明光観察および狭帯域照明光観察の輝度成分の光を透過する第１フィルタと、白色照明光観察の輝度成分の光を透過する第２フィルタと、狭帯域照明光観察の輝度成分の光を透過する第３フィルタと、を用いて構成されるカラーフィルタと、白色照明光の場合、白色照明光観察の輝度成分に基づきカラー画像信号を生成し、狭帯域照明光の場合、第２フィルタに対応する画素の画素値を用いて、第１フィルタに対応する画素位置における白色照明光観察の輝度成分の画素値を補間した後、第１フィルタに対応する画素の画素値と、白色照明光観察の輝度成分の画素値とをもとに、第１フィルタに対応する画素位置における狭帯域照明光観察の輝度成分の画素値を補間してカラー画像信号を生成するデモザイキング処理部と、備えた。
