Robust low dimensional kernel correlation feature spaces that generalize to unseen datasets
2007
In this paper we demonstrate the subspace generalization power of the kernel correlation feature analysis (KCFA)
method for extracting a low dimensional subspace that has the ability to represent new unseen datasets. Examining the
portability of this algorithm across different datasets is an important practical aspect of real-world face recognition
applications where the technology cannot be dataset-dependant. In most face recognition literature, algorithms are
demonstrated on datasets by training on one portion of the dataset and testing on the remainder. Generally, the testing
subjects' dataset partially or totally overlap the training subjects' dataset however with disjoint images captured from
different sessions. Thus, some of the expected facial variations and the people's faces are modeled in the training set. In
this paper we describe how we efficiently build a compact feature subspace using kernel correlation filter analysis on the
generic training set of the FRGC dataset and use that basis for recognition on a different dataset. The KCFA feature
subspace has a total dimension that corresponds to the number of training subjects; we chose to vary this number to
include up to all of 222 available in the FRGC generic dataset. We test the built subspace produced by KCFA by
projecting other well-known face datasets upon it. We show that this feature subspace has good representation and
discrimination to unseen datasets and produces good verification and identification rates compared to other subspace and
dimensionality reduction methods such as PCA (when trained on the same FRGC generic dataset). Its efficiency, lower
dimensionality and discriminative power make it more practical and powerful than PCA as a robust lower
dimensionality reduction method for modeling faces and facial variations.
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