PROBLEM TO BE SOLVED: To accurately extract a region of a remnant in a lumen organ from an image of lumen including lumen organs such as large intestine.SOLUTION: A region extraction apparatus comprises: a gas region extraction unit 11 extracting a gas region from an image of lumen including a lumen organ a remnant candidate region extraction unit 12 extracting a candidate of a region of a remnant in the lumen organ from the image of lumen as a remnant candidate area a border candidate region detection unit 13 detecting a border candidate region including a border of the gas region and the remnant candidate area a representative direction component acquisition unit 14 acquiring a representative direction component representing multiple direction components in the image in the border candidate area a border region detection unit 15 detecting a border region including the border of the gas region and the remnant region from the border candidate regions on the basis of the representative direction component and a remnant region extraction unit 16 extracting the remnant candidate region including the border region as a region of the remnant.COPYRIGHT: (C)2015,JPO&INPIT【課題】大腸などの管腔臓器を含む管腔画像から管腔臓器内の残滓の領域を高精度に抽出する。【解決手段】管腔臓器を含む管腔画像から気体領域を抽出する気体領域抽出部11と、管腔臓器内における残滓の領域の候補を管腔画像から残滓候補領域として抽出する残滓候補領域抽出部12と、気体領域と残滓候補領域との境界を含む境界候補領域を検出する境界候補領域検出部13と、境界候補領域内の画像における複数の方向成分を代表する代表方向成分を取得する代表方向成分取得部14と、代表方向成分に基づいて、境界候補領域の中から気体領域と残滓の領域との境界を含む境界領域を検出する境界領域検出部15と、境界領域を含む残滓候補領域を残滓の領域として抽出する残滓領域抽出部16とを備える。【選択図】図1
