PROBLEM TO BE SOLVED: To correct a change in color tone accompanying wavelength shift of a semiconductor light source and the like.SOLUTION: An endoscope has B-LED 20b, G-LED 20c, and R-LED 20d. The R-LED 20d has a peak wavelength within a transmission wavelength range of an R filter of a color imaging device, and emits red light whose peak wavelength shifts to a long-wavelength side the larger light emission intensity becomes. A light source control part 21 sets a drive amount to be added to the B-LED 20b, G-LED 20c, and R-LED 20d on the basis of a target quantity of light. A normal color conversion part 68 changes contents of color conversion processing in accordance with the drive amount to be added to the B-LED 20b, G-LED 20c, and R-LED 20d.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】半導体光源の波長シフトなどに伴う色調の変化を補正する。【解決手段】B-LED20b、G-LED20c、R-LED20dを有する。R-LED20dは、カラー撮像素子のRフィルタの透過波長範囲にピーク波長を有し、発光強度が大きくなる程、ピーク波長が長波長側にシフトする赤色光を発生する。光源制御部21は、目標光量に基づいて、B-LED20b、G-LED20c、R-LED20dに加える駆動量を設定する。通常用色変換部68は、B-LED20b、G-LED20c、R-LED20dに加える駆動量に応じて、色変換処理の内容を変更する。【選択図】図2
