PROBLEM TO BE SOLVED: To provide an endoscope system, a processor device, and an endoscope system operating method that make it possible, irrespective of the scattering characteristics of a subject, to accurately create an index of the depth of a blood vessel in tissue of the subject.SOLUTION: A blood vessel depth feature quantity calculating unit 72 calculates a blood vessel depth feature quantity Z. A scattering characteristics feature quantity calculating unit 74 calculates a scattering characteristics feature quantity W not including the blood vessel depth feature quantity but reflecting the scattering characteristics of the subject. A feature quantity correcting unit 76 corrects the blood vessel depth feature quantity Z by the scattering characteristics feature quantity W to obtain a corrected blood vessel depth feature quantity Za. A display unit 18 displays a blood vessel depth image based on the corrected blood vessel depth feature quantity Za.SELECTED DRAWING: Figure 7【課題】観察対象の散乱特性によらず、観察対象の組織内における血管の深さを正確に指標化する内視鏡システム、プロセッサ装置、及び内視鏡システムの作動方法を提供する。【解決手段】血管深さ特徴量算出部７２は血管深さ特徴量Ｚを算出する。散乱特性特徴量算出部７４は、血管深さ特徴量を含まず、且つ観察対象における散乱特性を反映する散乱特性特徴量Ｗを算出する。特徴量補正部７６は、散乱特性特徴量Ｗによって血管深さ特徴量Ｚを補正して補正血管深さ特徴量Ｚａを得る。表示部１８は、補正血管深さ特徴量Ｚａに基づいて血管深さ画像を表示する。【選択図】図７
