An object of the present invention is to provide an image processing technique capable of capturing the movement of the shape of a target area itself. The image processing apparatus (3) according to the present invention includes a dynamic image acquisition unit (110) that acquires a dynamic image, and a boundary line extraction unit that extracts a boundary line of the target region and obtains a plurality of target region boundary lines ( 130) and pixels corresponding to the plurality of target region boundary lines, and among the plurality of target region boundary lines, the reference boundary line is set for any one or more of the target region boundary lines other than the reference boundary line. A displacement amount based on a displacement reference is calculated, and the displacement amount is a component that needs to be removed. After the displacement amount is calculated, a predetermined number of target area boundary lines other than the reference boundary line are corrected using the displacement amount, so that Displacement correction means (140) for obtaining a predetermined number of displacement-corrected boundary lines from which the information is removed, and display means (34) for displaying displacement-corrected boundary information for display based on the predetermined number of displacement-corrected boundary lines； Is provided.本発明は、対象領域の形状の動きそのものを捉えることが可能な画像処理技術を提供することを目的とする。そして、本発明に係る画像処理装置（３）は、動態画像を取得する動態画像取得部（１１０）と、対象領域の境界線を抽出して複数の対象領域境界線を得る境界線抽出手段（１３０）と、複数の対象領域境界線に対応する画素を用いて、複数の対象領域境界線のうち、基準境界線以外の対象領域境界線のいずれか１つまたはそれ以上について、基準境界線を変位基準とした変位量を算出し、該変位量は要除去成分であり、変位量算出後に変位量を用いて基準境界線以外の所定数の対象領域境界線を補正することにより、要除去成分が取り除かれた所定数の変位補正済境界線を得る変位補正手段（１４０）と、所定数の変位補正済境界線に基づく表示用の変位補正済境界線情報を表示する表示手段（３４）とを備える。
