CAJ | 학술논문

为了定量化评估农作物的虫害程度,提出了一种基于典型叶片模板自动匹配的叶片虫损面积测量新方法.先将叶片图像二值化并提取其外轮廓;再对提取的轮廓进行多边形近似,以多边形的顶点为端点将叶片外轮廓划分成若干子轮廓;然后采用形状上下文对完整叶片与虫损叶片之间的子轮廓进行自动配准,找出其间的相互映射关系;最后根据映射关系对虫损叶片进行重建,计算出虫损面积.对10类不同叶片的测量分析表明:该方法平均每叶片耗时0.962 s,最大相对误差为8.22%,平均相对误差为4.78%.其中,形状复杂度高的叶片平均相对误差为7.48%,复杂度中等的叶片为5.99%,复杂度低的叶片为1.84%.结果表明,该方法能准确而快速地测量虫损叶面积.
위료정양화평고농작물적충해정도,제출료일충기우전형협편모판자동필배적협편충손면적측량신방법.선장협편도상이치화병제취기외륜곽;재대제취적륜곽진행다변형근사,이다변형적정점위단점장협편외륜곽화분성약간자륜곽;연후채용형상상하문대완정협편여충손협편지간적자륜곽진행자동배준,조출기간적상호영사관계;최후근거영사관계대충손협편진행중건,계산출충손면적.대10류불동협편적측량분석표명:해방법평균매협편모시0.962 s,최대상대오차위8.22%,평균상대오차위4.78%.기중,형상복잡도고적협편평균상대오차위7.48%,복잡도중등적협편위5.99%,복잡도저적협편위1.84%.결과표명,해방법능준학이쾌속지측량충손협면적.
In order to evaluate the pest-damaged extent of crop quantitatively, the anthors proposed a novel method based on auto-matching of representative whole leaf to measure leaf pest-damaged area. Firstly, the outer contour of leaf was extracted after image binary; secondly, the contour was approximated to a polygon and segmented to many sub-contours using polygon vertexes; thirdly, the mapping relationship between the whole leaf and the pest-damaged leaf was constructed by matching their sub-contours based on the shape context; finally, the pest-damaged leaf was reconstructed by mapping their sub-contour relationship for area calculation. The experiments on ten types of different leaves showed that the average process time for one leaf was 0.952 s, the maximum relative error was 8.22% and, the average relative error was 4.78%. As to leaves with high shape complexity, the average relative error was 7.48%, and to leaves with medium and low shape complexity, those were 5.99% and 1.84%, respectively. The proposed method has proved to be an accurate and efficient method for measurement of leaf pest-damaged area.