PROBLEM TO BE SOLVED: To address such a problem that, when narrow-band light and wide-band light are applied to a subject, it is difficult to capture an image of a specific biological structure at a high contrast.SOLUTION: An electronic endoscope system includes: a narrow-band light source part for exiting narrow-band light a wide-band light source part for exiting wide-band light means for drivingly controlling the light source parts to alternately emit the narrow-band light and the wide-band light means that captures an image of a subject to which the narrow-band light and the wide-band light are alternately applied, generates an image signal of the subject captured when the narrow-band light is applied thereto, as a first image signal, and generates an image signal of the subject captured when the wide-band light is applied thereto, as a second image signal means that generates a first luminance signal on the basis of the first image signal and generates a second luminance signal on the basis of the second image signal, and generates a luminance signal of the subject on the basis of the generated first and second luminance signals and means for generating a video signal of the subject using the generated luminance signal of the subject.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】狭帯域光及び広帯域光を被写体に照射する場合に特定の生体構造を高いコントラストで撮像することが難しい。【解決手段】狭帯域光を射出する狭帯域光源部と、広帯域光を射出する広帯域光源部と、これらの光源部を駆動制御して狭帯域光と広帯域光とを交互に射出させる手段と、狭帯域光と広帯域光とで交互に照射される被写体を撮像する手段であって、狭帯域光の照射中に撮像された被写体の画像信号を第一画像信号として生成すると共に広帯域光の照射中に撮像された被写体の画像信号を第二画像信号として生成するものと、第一画像信号に基づいて第一輝度信号を生成すると共に第二画像信号に基づいて第二輝度信号を生成し、生成された第一及び第二輝度信号に基づいて被写体の輝度信号を生成する手段と、生成された被写体の輝度信号を用いて該被写体のビデオ信号を生成する手段とを備える電子内視鏡システムを提供する。【選択図】図1
