PROBLEM TO BE SOLVED: To improve accuracy of analyzing a monitor image.SOLUTION: An analysis device 100 receives designation of a first area in a monitor image and designation of a second area in the monitor image. In a case where the luminance of the first area is not determined to be not higher than a first reference and the luminance of the second area is not lower than a second reference, the analysis device 100 executes color analysis of a target included in a monitor image by enlarging a saturation extraction range to be larger than the saturation extraction range in a case where the luminance of the first area is higher than the first reference.SELECTED DRAWING: Figure 1【課題】監視画像に対する解析精度を向上する。【解決手段】解析装置１００は、監視画像のうち第１の領域の指定と、第２の領域の指定とを受け付ける。解析装置１００は、第１の領域の輝度が第１の基準以下と判定され、かつ、第２の領域の輝度が第２の基準以上の場合に、第１の領域の輝度が第１の基準を超える場合に比較して、彩度の抽出範囲を拡大させて監視画像に含まれる対象物の色解析を実行する。【選択図】図１
