Maximal Linear Embedding for Dimensionality Reduction
Maximal Linear Embedding for Dimensionality Reduction
复制标题
用于降维的最大线性嵌入
DOI:
10.1109/tpami.2011.39
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发表时间:
2011-09
期刊:
影响因子:
--
通讯作者:
Shufu Xie, Shiguang Shan, Xilin Chen, Jie Chen
中科院分区:
文献类型:
--
作者:
Shufu Xie, Shiguang Shan, Xilin Chen, Jie Chen
Over the past few decades, dimensionality reduction has been widely exploited in computer vision and pattern analysis. This paper proposes a simple but effective nonlinear dimensionality reduction algorithm, named Maximal Linear Embedding (MLE). MLE learns a parametric mapping to recover a single global low-dimensional coordinate space and yields an isometric embedding for the manifold. Inspired by geometric intuition, we introduce a reasonable definition of locally linear patch, Maximal Linear Patch (MLP), which seeks to maximize the local neighborhood in which linearity holds. The input data are first decomposed into a collection of local linear models, each depicting an MLP. These local models are then aligned into a global coordinate space, which is achieved by applying MDS to some randomly selected landmarks. The proposed alignment method, called Landmarks-based Global Alignment (LGA), can efficiently produce a closed-form solution with no risk of local optima. It just involves some small-scale eigenvalue problems, while most previous aligning techniques employ time-consuming iterative optimization. Compared with traditional methods such as ISOMAP and LLE, our MLE yields an explicit modeling of the intrinsic variation modes of the observation data. Extensive experiments on both synthetic and real data indicate the effectivity and efficiency of the proposed algorithm.
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