To provide an image processing technology that can extract a radiation region.SOLUTION: An image processing device for extracting an irradiation field region in a radiographic image includes: an inference unit for acquiring an irradiation field candidate region in an image on the basis of inference processing; a contour extraction unit for extracting a contour of an irradiation field region on the basis of contour extraction processing to the irradiation field candidate region; and a region extraction unit for extracting the irradiation field region on the basis of the contour.SELECTED DRAWING: Figure 2【課題】照射領域を抽出できる画像処理技術を提供すること。【解決手段】放射線撮影された画像内の照射野領域を抽出する画像処理装置は、画像内の照射野候補領域を推論処理に基づいて取得する推論部と、照射野候補領域に対する輪郭抽出処理に基づいて照射野領域の輪郭を抽出する輪郭抽出部と、輪郭に基づいて照射野領域を抽出する領域抽出部と、を備える。【選択図】図2