PROBLEM TO BE SOLVED: To provide an image processing apparatus, image processing method, and optical member.SOLUTION: An image processing apparatus has an image formation optical system that has a marker and is capable of changing an angle in line-of-sight direction, an angle specification unit that specifies the angle in line-of-sight direction on the basis of an in-vivo image based on light transmitted through an optical member connected optically, and an image processing unit that performs image processing of the in-vivo image.SELECTED DRAWING: Figure 7【課題】画像処理装置、画像処理方法、及び光学部材を提供する。【解決手段】マーカ部を有し、視線方向の角度可変な結像光学系と、光学的に接続される光学部材を透過する光に基づく生体内画像に基づいて、前記視線方向の角度を特定する角度特定部と、前記生体内画像に対する画像処理を行う画像処理部と、を備える、画像処理装置。【選択図】図７
