Problem to be solved: to provide an electronic endoscope system for performing luminance adjustment capable of obtaining an image of an appropriate luminance in a short time as compared with the prior art.The electronic endoscope system comprises an electron endoscope having an image pickup device and an image processor having an image processing unit for generating an image for display from an imaging image of a living body picked up by an imaging device.The electron endoscope or the processor is provided with a photometry section for obtaining luminance information of the image obtained by the image pickup device and for adjusting luminance based on the luminance information.The above described photometry unit is a saturation pixel digitizing unit for quantifying the saturation of the above noted pixels based on the information of the peripheral distribution of the unsaturated pixels or the saturation pixels surrounding the noted pixel as the target pixel, and the saturation of the saturation pixels exceeding the upper limit of the allowable received light quantity The first adjustment pixel is provided with a first adjustment section for adjusting the luminance based on the result of the above described numerical values of the respective target pixels.Diagram【課題】従来に比べて、適正な輝度の画像を短時間に得ることができる輝度調整を行う電子内視鏡システムを提供する。【解決手段】電子内視鏡システムは、撮像素子を備える電子内視鏡と、撮像素子で撮像した生体組織の撮像画像から表示用画像を生成する画像処理部と、を有するプロセッサと、を備える。電子内視鏡あるいはプロセッサには、前記撮像素子により得られた画像の輝度情報を求め、前記輝度情報に基づいて、輝度調整を行うように構成された測光部が設けられる。前記測光部は、前記撮像画像のうち、飽和画素のそれぞれを注目画素として、前記注目画素を取り巻く非飽和画素あるいは飽和画素の周辺分布の情報に基づいて前記注目画素における前記許容受光光量の上限を超えた飽和の程度を数値化する飽和画素数値化部と、前記注目画素それぞれの前記数値化の結果に基づいて輝度に関する調整を行う第１調整部と、を備える。【選択図】 図２
