PROBLEM TO BE SOLVED: To provide a fundus image processing device capable of obtaining an image by which determination of an artery-vein diameter ratio is facilitated.SOLUTION: A fundus image processing device comprises: blood vessel region enhancement means 10 for acquiring a blood vessel enhancement image in which as a probability of being a blood vessel region is higher, a higher value is set, by enhancing a blood vessel region to a color fundus image； hue conversion means (20, 30, 40) for acquiring a hue conversion image in which an RGB balue is converted into a hue value of an L gradation by converting the RGB value acquired by referring to a corresponding pixel of the color fundus image to each pixel in the blood vessel region into the hue value of the L gradation； threshold calculation means 50 for calculating a threshold of binarization by using a histogram calculated on the basis of the pixel corresponding to the blood vessel region of the hue conversion image； and artery-vein identification image generation means 60 for, on the basis of a comparison result between the hue value of the L gradation of each pixel corresponding to the blood vessel region of the hue conversion image and the threshold, acquiring an artery-vein identification image to which an attribute of an artery or a vein is applied.SELECTED DRAWING: Figure 2【課題】 動静脈径比の判定を行い易くするための画像を得ることが可能な眼底画像処理装置を提供する。【解決手段】 カラー眼底画像に対して血管領域を強調し、血管領域である確率が高い画素ほど高い値が設定された血管強調画像を得る血管領域強調手段１０と、血管強調画像の中で所定値以上の画素を血管領域の画素として抽出し、血管領域の各画素に対して、カラー眼底画像の対応する画素を参照して取得したＲＧＢ値をＬ階調の色相値に変換し、Ｌ階調の色相値に変換された色相変換画像を得る色相変換手段（２０，３０，４０）と、色相変換画像の血管領域に対応する画素を基に算出したヒストグラムを用いて二値化のしきい値を算出するしきい値算出手段５０と、色相変換画像の血管領域に対応する各画素のＬ階調の色相値としきい値との比較結果に基づいて、動脈または静脈の属性が付与された動静脈識別画像を得る動静脈識別画像生成手段６０を有する。【選択図】 図２
