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基于CT圖像的蘋果苦痘病與磕碰傷識別
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河北農(nóng)業(yè)大學(xué)理工基金項目(ZD201702)


Recognition of Apple Bitter Pit and Bruise Based on CT Image
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    摘要:

    對苦痘病進行持續(xù)、準確、量化的無損檢測,以及育種專家對新品種蘋果的抗苦痘病表型研究,都需要苦痘病準確識別技術(shù)的支持。針對磕碰傷對苦痘病識別產(chǎn)生干擾,降低了識別準確率問題,基于蘋果CT圖像,提出了一種蘋果苦痘病和磕碰傷識別方法。首先,采用最大類間方差法、區(qū)域標記、中值濾波等方法,對337幀蘋果CT圖像進行圖像分割和傷病區(qū)域定位;其次,對傷病區(qū)域進行特征提取,提取其形狀特征、紋理特征和位置特征共18種特征信息;然后,利用多元逐步回歸和類距離可分離性判據(jù)2種方法分別選取特征信息,將2種方法選出的相同特征作為本文的選用特征信息;最后,分別使用遺傳算法優(yōu)化的支持向量機和默認參數(shù)的支持向量機,對蘋果苦痘病和磕碰傷進行識別。識別結(jié)果表明,經(jīng)過遺傳算法優(yōu)化的支持向量機的總體識別準確率高于93%,默認參數(shù)的支持向量機算法的總體識別準確率高于84%。遺傳算法優(yōu)化后的支持向量機的識別準確率明顯優(yōu)于默認參數(shù)的支持向量機的識別準確率。

    Abstract:

    Continuous, accurate, and quantitative non-destructive testing of bitter pit, as well as research on the phenotype of new varieties of apples by breeding experts, require the support of accurate bitter pit identification technology. The presence of bruise will interfere with the recognition of bitter pit and reduce the recognition accuracy. Therefore, it is necessary to carry out research on the recognition of bitter pit and bruise. Based on the CT images of apples, a method for identifying apple bitter pit and bruise was proposed. The method such as maximum between-class variance, region labeling and median filtering were used to segment 337 apple CT images and locate the injured area. Following this step, a total of 18 features of the shape, texture and location of the injured area were extracted. Additionally, the feature information was selected using two methods of multiple stepwise regression and class distance separability criterion. The common features selected by the two methods were used as the selected feature information. Finally, the support vector machine optimized by genetic algorithm and the support vector machine with default parameters were used to identify apple bitter pit and bruise. The recognition results showed that the overall recognition accuracy of the support vector machine optimized by the genetic algorithm was higher than 93%, and the overall recognition accuracy of the support vector machine algorithm with default parameters was higher than 84%. The recognition accuracy of the support vector machine optimized by the genetic algorithm was obviously better than that of the support vector machine with default parameters. The research results can be used to cultivate the phenotype analysis of apple bitter pit and bruise.

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司永勝,曹珊珊,張曉雪,籍穎,呂繼興.基于CT圖像的蘋果苦痘病與磕碰傷識別[J].農(nóng)業(yè)機械學(xué)報,2021,52(10):377-384. SI Yongsheng, CAO Shanshan, ZHANG Xiaoxue, JI Ying, Lü Jixing. Recognition of Apple Bitter Pit and Bruise Based on CT Image[J]. Transactions of the Chinese Society for Agricultural Machinery,2021,52(10):377-384.

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  • 收稿日期:2020-10-06
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  • 在線發(fā)布日期: 2020-12-02
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