PROBLEM TO BE SOLVED: To make it possible to automatically generate a change region of a forest from an aerial photograph etc. with high accuracy.SOLUTION: A forest phase analyzer comprises: a statistic distribution creation unit 26 and a change region detection unit 28. The statistic distribution creation unit 26 sets an attention region in an original image which is obtained by photographing a target region from the sky at a second period corresponding to each forest phase region of the target region including the forest in an existing forest phase segment map at a first period so that statistic distribution of characteristic information with respect to the image extracted by a prescribed element region in an attention region of each forest phase is obtained. The change region detection unit 28 detects outlier in the statistic distribution of each attention region and regards the element region providing the outlier as the change region where the forest phase is changed in the attention region between the first period and the second period.COPYRIGHT: (C)2015,JPO&INPIT【課題】航空写真等から森林の変化領域を高精度で自動的に生成することを可能とする。【解決手段】統計分布作成部26は、森林を含む対象地域の第1の時期における既知の林相区分図での各林相の領域に対応して、対象地域を第2の時期に上空から撮影した原画像に注目領域を設定し、各林相の注目領域にて所定の要素領域ごとに抽出される画像の特徴情報について統計分布を求める。変化領域検出部28は各注目領域での統計分布における外れ値を検出し、当該外れ値を与える要素領域を当該注目領域において第1の時期との間で林相が変化した変化領域として検出する。【選択図】図1
