
Proceedings Paper
Feature clustering in direct eigen-vector data reduction using support vector machinesFormat | Member Price | Non-Member Price |
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Paper Abstract
Principal Component Analysis (PCA) has been used in a variety of applications like feature extraction for
classification, data compression and dimensionality reduction. Often, a small set of principal components are
sufficient to capture the largest variations in the data. As a result, the eigen-values of the data covariance matrix
with the lowest magnitude are ignored (along with their corresponding eigen-vectors) and the remaining eigenvectors
are used for a 'coarse' representation of the data. It is well known that this process of choosing a few
principal components naturally induces a loss in information from a signal reconstruction standpoint. We propose
a new technique to represent the data in terms of a new set of basis vectors where the high-frequency detail is
preserved, at the expense of a 'feature-scale blurring'. In other words, the 'blurring' that occurs due to possible colinearities
in the bases vectors is relative to the eigen-features' scales; this is inherently different from a systematic
blurring function. Instead of thresholding the eigen-values, we retain all eigen-values, and apply thresholds on the
components of each eigen-vector separately. The resulting basis vectors can no longer be interpreted as eigenvectors
and will, in general, lose their orthogonality properties, but offer benefits in terms of preserving detail that
is crucial for classification tasks. We test the merits of this new basis representation for magnitude synthetic
aperture radar (SAR) Automatic Target Recognition (ATR). A feature vector is obtained by projecting a SAR image
onto the aforementioned basis. Decision engines such as support vector machines (SVMs) are trained on example
feature vectors per class and ultimately used to recognize the target class in real-time. Experimental validation are
performed on the MSTAR database and involve comparisons against a PCA based ATR algorithm.
Paper Details
Date Published: 17 May 2012
PDF: 10 pages
Proc. SPIE 8392, Signal Processing, Sensor Fusion, and Target Recognition XXI, 83921N (17 May 2012); doi: 10.1117/12.919400
Published in SPIE Proceedings Vol. 8392:
Signal Processing, Sensor Fusion, and Target Recognition XXI
Ivan Kadar, Editor(s)
PDF: 10 pages
Proc. SPIE 8392, Signal Processing, Sensor Fusion, and Target Recognition XXI, 83921N (17 May 2012); doi: 10.1117/12.919400
Show Author Affiliations
Vahid R. Riasati, MacAulay-Brown Engineering (United States)
Wenhue Gao, Univ. of California, Los Angeles (United States)
Published in SPIE Proceedings Vol. 8392:
Signal Processing, Sensor Fusion, and Target Recognition XXI
Ivan Kadar, Editor(s)
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