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Robust Data Whitening as an Iteratively Re-weighted Least Squares Problem

Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 10269)

Abstract

The entries of high-dimensional measurements, such as image or feature descriptors, are often correlated, which leads to a bias in similarity estimation. To remove the correlation, a linear transformation, called whitening, is commonly used. In this work, we analyze robust estimation of the whitening transformation in the presence of outliers. Inspired by the Iteratively Re-weighted Least Squares approach, we iterate between centering and applying a transformation matrix, a process which is shown to converge to a solution that minimizes the sum of \(\ell _2\) norms. The approach is developed for unsupervised scenarios, but further extend to supervised cases. We demonstrate the robustness of our method to outliers on synthetic 2D data and also show improvements compared to conventional whitening on real data for image retrieval with CNN-based representation. Finally, our robust estimation is not limited to data whitening, but can be used for robust patch rectification, e.g. with MSER features.

Keywords

Convolutional Neural Network Robust Principal Component Analysis Semantic Segmentation Conventional Principal Component Analysis Supervise Case 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.Visual Recognition GroupCzech Technical University in PraguePragueCzech Republic

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