淡江大學機構典藏:Item 987654321/58748
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    題名: Iterative Sliced Inverse Regression for Segmentation of Ultrasound and MR Images
    作者: 吳漢銘;Lu, H. H.-S
    貢獻者: 淡江大學數學學系
    關鍵詞: Unsupervised clustering;K-Means;Dimension reduction;Multidimensional scaling;Sliced inverse regression;Nearest mean classifier;Support vector machines
    日期: 2007-07
    上傳時間: 2011-10-01 21:08:15 (UTC+8)
    摘要: In this study, we propose an integrated approach based on iterative sliced inverse regression (ISIR) for the segmentation of ultrasound and magnetic resonance (MR) images. The approach integrates two stages. The first is the unsupervised clustering which combines multidimensional scaling (MDS) with K-Means. The dimension reduction based on MDS is employed to obtain fewer representative variates as input variables for K-Means. This step intends to generate the initial group labels of the training data for the second stage of supervised segmentation. We then combine the SIR with the nearest mean classifier (NMC) or the support vector machine (SVM) to iteratively update the group labels for supervised segmentation. The method of SIR is introduced by Li [Sliced inverse regression for dimension reduction. J. Am. Stat. Assoc. 86 (1991) 316–342] to explore the effective dimension reduction (e.d.r.) directions from the training data embedded in high-dimensional space. The test data are then projected onto these directions and the classifiers are further applied to classify the test data. The integrated approach based on ISIR is evaluated on simulated and clinical images, which include ultrasound and MR images. The evaluation results indicate that this approach provides an improvement of image segmentation over the methods to be compared without dimension reduction.
    關聯: Pattern Recognition 40(12), pp.3492-3502
    DOI: 10.1016/j.patcog.2007.04.019
    顯示於類別:[數學學系暨研究所] 期刊論文

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