In the present invention, characteristic artifacts are corrected in the case of magnified observation by means of an oxygen saturation image. This endoscope system (10) is provided with an image generation unit (84), a low-frequency component extraction unit (103), a high-frequency component extraction unit (101), and a combining process unit (104). The image generation unit (84) generates a first oxygen saturation image on the basis of a first image signal obtained by imaging a specimen and the oxygen saturation calculated on the basis of the first image signal. Also, the image generation unit (84) generates a second image signal obtained by imaging the specimen magnified more than during the output of the first image signal, and a second oxygen saturation image that is on the basis of the oxygen saturation calculated on the basis of the second image signal. The low-frequency component extraction unit (103) extracts the low-frequency component that is less than a cutoff frequency from the first oxygen saturation image, and the high-frequency component extraction unit (101) extracts a high-frequency component that is at least the cutoff frequency from the second oxygen saturation image. The combining process unit (104) generates a combined oxygen saturation image resulting from combining same.Dans la présente invention, les artefacts caractéristiques sont corrigés dans le cas dune observation agrandie au moyen dune image de saturation en oxygène. Ce système dendoscopie (10) comprend une unité de génération dimage (84), une unité dextraction de composante de basse fréquence (103), une unité dextraction de composante de haute fréquence (101) et une unité de traitement de combinaison (104). Lunité de génération dimage (84) génère une première image de saturation en oxygène sur la base dun premier signal dimage obtenu par limagerie dun spécimen et de la saturation en oxygène calculée sur la base du premier signal dimage. En outre, lunité de génération dimage (84) génère
