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- 저자 : Xiaobai Li (검색결과 2 건)
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An unsupervised marker image generation method for watershed segmentation of multispectral imagery
Peijun Li,Xiaobai Xiao 한국지질과학협의회 2004 Geosciences Journal Vol.8 No.3
Watershed transformation in mathematical morphology is a powerful tool for image segmentation. Watershed transformation based segmentation is generally a marker-controlled segmentation. This paper proposes a novel method of maker image generation based on unsupervised ISODATA classification. The method incorporates spectral information contained in multispectral data into watershed transformation for image segmentation. The method is evaluated and compared to existing unsupervised method. The results show that the proposed method could effectively reduce the oversegmentation effect and achieve more accurate segmentation results, compared to existing method. The combination of segmentation result and pixel-based classification is found to improve the overall classification accuracy over pixel-based classification.
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Dianxing Wu,Xiaobai Li,Wengui Yan,Hesham Agrama,Aaron Jackson,Melissa Jia,Limeng Jia,Karen Moldenhauer,Fernando Correa 한국유전학회 2016 Genes & Genomics Vol.38 No.5
Straighthead is a physiological disorder in rice that causes yield losses and is a serious threat to rice production worldwide. Identification of QTL conferring resistance will help develop resistant cultivars for straighthead control. We conducted linkage mapping to identify QTL involved with straighthead. The study was based on a F2 population developed from a cross between ‘Zhe733(resistant)/R312(susceptible)’. Using phenotypic data of F2 plants and their F2:3 families, two major QTL, qSTH-2 and qSTH-8, were identified using bulked segregant analysis, explaining 11.1 and 28.1 % of the phenotypic variation on chromosome 2 and 8, respectively. The qSTH-2 for straighthead resistance was identified by linkage mapping. qSTH-2 was situated near a QTL ‘‘AsS’’ responsible for arsenic accumulation. Straighthead is frequently observed on land where As has accumulated. The result suggests a kind of internal connection between qSTH-2 and AsS. Additionally, the QTL qSTH-8 was located close to HD5 related with heading date. The close location may be associated with the observation of early heading among straighthead resistant varieties. These findings should be useful for further genetic study of straighthead.
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