PROBLEM TO BE SOLVED: To reduce a processing time while appropriately extracting an object from an image.SOLUTION: An image processing device includes: a changing unit for changing a threshold of brightness at each point in an image； a first display control unit for executing control so as to display a point including a brightness value of a threshold or more each time the threshold is changed by the changing unit； a reception unit for receiving designation of one or a plurality of predetermined regions in a displayed image based on a user operation； a fixing unit for fixing a threshold of each point in the predetermined regions that have been designated to a threshold by the changing unit at the time of the designation of the predetermined regions； and a second display control unit for executing control so as to display a point including a brightness value equal to or more than the threshold fixed by the fixing unit of the points in the predetermined regions if there is one or a plurality of predetermined regions in the image, and a point including a brightness value equal to or more than the threshold changed by the changing unit of the points out of the predetermined regions.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】画像から対象物を適切に抽出しつつ、処理時間を軽減する。【解決手段】画像内の各点における明度の閾値を変更する変更部と、変更部により閾値が変更される度に、閾値以上の明度値を含む点を表示するよう制御する第１表示制御部と、ユーザ操作に基づき、表示された画像内の１又は複数の所定領域の指定を受け付ける受付部と、指定された所定領域内の各点の閾値を、所定領域の指定時の変更部による閾値に固定する固定部と、画像内に１又は複数の所定領域がある場合、所定領域内の点のうち固定部により固定された閾値以上の明度値を含む点、及び所定領域外の点のうち変更部により変更される閾値以上の明度値を含む点を表示するよう制御する第２表示制御部と、を備える。【選択図】図２
