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Out-of-Sample Extension for Dimensionality Reduction of Noisy Time Series.

Authors
  • Dadkhahi, Hamid
  • Duarte, Marco F
  • Marlin, Benjamin M
Type
Published Article
Journal
IEEE Transactions on Image Processing
Publisher
Institute of Electrical and Electronics Engineers
Publication Date
Aug 02, 2017
Identifiers
DOI: 10.1109/TIP.2017.2735189
PMID: 28783635
Source
Medline
License
Unknown

Abstract

This paper proposes an out-of-sample extension framework for a global manifold learning algorithm (Isomap) that uses temporal information in out-of-sample points in order to make the embedding more robust to noise and artifacts. Given a set of noise-free training data and its embedding, the proposed framework extends the embedding for a noisy time series. This is achieved by adding a spatiotemporal compactness term to the optimization objective of the embedding. To the best of our knowledge, this is the first method for out-of-sample extension of manifold embeddings that leverages timing information available for the extension set. Experimental results demonstrate that our out-of-sample extension algorithm renders a more robust and accurate embedding of sequentially ordered image data in the presence of various noise and artifacts when compared to other timingaware embeddings. Additionally, we show that an out-ofsample extension framework based on the proposed algorithm outperforms the state of the art in eye-gaze estimation.

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