An image processing apparatus according to the present invention is an information input unit that receives an input of three-dimensional structure information indicating a three-dimensional structure of a heart, and an inner wall of an atrioventricular chamber of the heart indicated by the three-dimensional structure information, which is two-dimensional based on an isometric drawing method. An image generating unit that develops the image into two images and divides the two-dimensional image into a front wall, a rear wall, a left side wall, and a right side wall to generate a developed image. The three-dimensional structure in the atrioventricular chamber of the heart indicated by the three-dimensional structure information is mapped on the developed image by a drawing method expressed by lightness.本発明に係る画像処理装置は、心臓の立体構造を示す三次元構造情報の入力を受け付ける情報入力部と、三次元構造情報で示される心臓の房室の内壁を、正積図法に基づいて二次元画像に展開し、該二次元画像を前壁、後壁、左側壁および右側壁に分けて断裂した展開画像を生成する画像生成部と、を備え、画像生成部は、立体構造を彩度および明度で表現する図法により、三次元構造情報に示される心臓の房室内の立体構造を展開画像上にマッピングする。
