Aiming at defect detection and defect types judgment in the classification of apple, this paper proposes a method which can detect the defects of the apple including its bruise, scratch, wormholes and decay. The outline temperature curve in infrared thermogram is used to judge pedicle and calyx. Temperature difference between wormholes and apple body is relatively small in active heating process. Thermal conductivity coefficients of bruise, scratch and decay are different, which leads to different temperature corresponding points in infrared thermogram with changing time curve. Temperature change curve is used to distinguish different methods.%针对苹果在分级中缺陷检测及缺陷种类的判断,提出了苹果的擦伤、撞伤、虫孔及腐烂等缺陷检测方法,利用红外热像图中的线轮廓温度曲线来判断果梗、花萼；主动加热过程中虫孔处与果体外温差相对较小,擦伤、撞伤及腐烂处的导热系数不同,从而导致其在红外热像图中对应表面上的点的温度随时间的变化曲线也不相同,据此提出了利用温度变化曲线来区分不同缺陷种类的方法.
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