Discrimination of rice panicles by hyperspectral reflectance data based on principal component analy

来源 :Journal of Zhejiang University-Science B(Biomedicine & Biote | 被引量 : 0次 | 上传用户:chenghao131
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Detection of crop health conditions plays an important role in making control strategies of crop disease and insect damage and gaining high-quality production at late growth stages. In this study, hyperspectral reflectance of rice panicles was measured at the visible and near-infrared regions. The panicles were divided into three groups according to health conditions: healthy panicles, empty panicles caused by Nilaparvata lugens Stul, and panicles infected with Ustilaginoidea virens. Low order derivative spectra, namely, the first and second orders, were obtained using different techniques. Principal component analysis (PCA) was performed to obtain the principal component spectra (PCS) of the foregoing derivative and raw spectra to reduce the reflectance spectral dimension. Support vector classification (SVC) was employed to discriminate the healthy, empty, and infected panicles, with the front three PCS as the independent variables. The overall accuracy and kappa coefficient were used to assess the classification accuracy of SVC. The overall accuracies of SVC with PCS derived from the raw, first, and second reflectance spectra for the testing dataset were 96.55%, 99.14%, and 96.55%, and the kappa coefficients were 94.81%, 98.71%, and 94.82%, respectively. Our results demonstrated that it is feasible to use visible and near-infrared spectroscopy to discriminate health conditions of rice panicles. Detection of crop health conditions plays an important role in making control strategies of crop disease and insect damage and gaining high-quality production at late growth stages. In this study, hyperspectral reflectance of rice panicles was measured at the visible and near-infrared regions. The panicles were divided into three groups according to health conditions: healthy panicles, empty panicles caused by Nilaparvata lugens Stul, and panicles infected with Ustilaginoidea virens. component analysis (PCA) was performed to obtain the principal component spectra (PCS) of the previously derivative and raw spectra to reduce the reflectance spectral dimension. Support vector classification (SVC) was employed to discriminate the healthy, empty, and infected panicles, with the front three PCS as the independent variables. The overall accuracy and kappa coefficient were used To assess the classification accuracy of SVC. The overall accuracies of SVC with PCS derived from the raw, first, and second reflectance spectra for the testing dataset were 96.55%, 99.14%, and 96.55%, and the kappa coefficients were 94.81%, 98.71 %, and 94.82%, respectively. Our results of it is feasible to use visible and near-infrared spectroscopy to discriminate health conditions of rice panicles.
其他文献
[Objective] The research aimed at determining the contents of ursolic acid and oleanolic acid in different species and different origins of Kuding tea and provi
介绍了新型CGM60-B锥摆式搅拌磨的工作原理和主要结构。与普通搅拌磨相比,该机由于搅拌锥周期性的偏摆,增加了对物料挤压、剪切和磨损使其磨粉效率大为提高;同时,与同等容积
为进一步拓宽本刊的宣传渠道,及时给读者发布本刊的新动态,华南农业大学学报(社科版)微信公众平台“华南农业大学学报(社科版)”(微信号:skxbscau)、腾讯微博“华南农业大学
Located at the eastern side of Helanshan Mountain, the tombs for the kings of Western Xia regime (1038 1227) are 30 kilometers to the west of Yinchuan. capital
我独居曼谷颇感无聊,于是萌发了外出旅游探险的念头,在一个周末的清晨,背了背包,带着宿醉,坐上了曼谷市区的30路汽车,随着拥挤的车流缓缓而行,越过湄南河,来到吞武里南方汽车总站搭乘长
旅游,作为永不衰退的朝阳产业,目前是世界上仅次于石油的第二大产业,产值达3.4万亿美元。专家们预测,到本世纪末会达到7.2万亿美元,成为第一大产业。旅游可带动交通、通讯、
P chromosomes may carry a genetic system that inhibits the Ph gene in wheat. Abnormal chromosome synapsis in wheat-Agropyron cristatum addition line II-21-2 (ad
天津社会科学院舆情研究所创立于1999年10月,其前身为“天津社会科学院舆情调查研究中心”。该研究所自成立以来,一直致力于舆情研究学科建设,在舆情基础理论研究方面居全国
沙捞越是马来西亚最大的一个州,位于婆罗洲西北部。沙捞越风光旖旎,分布着10个国家公园。在这些国家公园中,山峦迤逦、河流纵横,有许多巧夺天工的天然石洞,还有迷人的海滩及神秘的热
不辞万里来到距阿富汗边界60公里的巴基斯坦重镇白沙瓦,我们稍稍休息了一下,便迫不及待地向旅店经理打听我们此行的真正目的地———距此不远的一个小镇———达拉(DaraAdamKhel)的情况。“那个