基于介电特征选择的苹果内部品质无损分级

为了快速而准确地利用介电特性对苹果内部品质进行无损分级,该文对500个富士苹果的108种特征值（12种介电参数在9个频率点下）进行了分析筛选,以获取用于5个品质等级富士苹果无损分级的最少介电特征。在整个内部品质的分级过程中,贪心选择法、基于快速聚类的特征子集选择法、稀疏主成分分析法和以信息增益为评价函数的属性排序法共4种方法被用来从108种介电特征中选择出对等级划分最有帮助的关键介电特征。试验结果显示,基于快速聚类的特征子集选择法仅选择了4种特征时分级正确率就达到了80%左右,而贪心选择法的性能明显更优,在分级正确率超过90%时,其选择的特征一般不超过10种,其最优情况为当选择了4种介电特征时...

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Bibliographic Details
Published in农业工程学报 Vol. 29; no. 21; pp. 279 - 287
Main Author 蔡骋 李永超 马惠玲 李晓龙
Format Journal Article
LanguageChinese
Published 西北农林科技大学信息工程学院,杨凌,712100%西北农林科技大学生命科学学院,杨凌,712100%宁夏农科院种质资源研究所,银川,750212 2013
Subjects
介电特征
内部品质
分级
无损检测
水果
苹果
nondestructive examination
内部品质
苹果
grading
fruits
水果
介电特征
dielectric properties
internal quality
无损检测
分级
apples
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ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2013.21.035

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Summary:为了快速而准确地利用介电特性对苹果内部品质进行无损分级,该文对500个富士苹果的108种特征值（12种介电参数在9个频率点下）进行了分析筛选,以获取用于5个品质等级富士苹果无损分级的最少介电特征。在整个内部品质的分级过程中,贪心选择法、基于快速聚类的特征子集选择法、稀疏主成分分析法和以信息增益为评价函数的属性排序法共4种方法被用来从108种介电特征中选择出对等级划分最有帮助的关键介电特征。试验结果显示,基于快速聚类的特征子集选择法仅选择了4种特征时分级正确率就达到了80%左右,而贪心选择法的性能明显更优,在分级正确率超过90%时,其选择的特征一般不超过10种,其最优情况为当选择了4种介电特征时,分级正确率为91.22%,而当选择了10种介电特征时,其分级正确率为95.95%。该研究为水果等农产品的品质与病虫害快速无损检测等提供参考。
Bibliography:In order to reduce the cost of the application of dielectric signals in nondestructive detection of fruits and crops, it is important to find effective methods to select the key features from all other dielectric features. In this paper, we propose a two stage framework to achieve a low cost effective apple internal quality estimation system. In the first stage, we search a compact discriminative dielectric feature sub set. And in the second stage,based on the dielectric features selected by the first stage, we propose a nondestructive apple internal quality estimation system by evaluating several classifiers. In our experiments, the internal quality of Fuji apples is graded into 5 grades according to a compact set of dielectric features which are selected from the 108 dielectric features obtained from 12 dielectric parameters under 9 frequency points ranging from 158Hz-3.98MHz, and all the dielectric features are measured with HIOKI 3532-50 LCR tester and labeled with a number ranging from 1 to 108. Meanwhil
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2013.21.035