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Independent Component Analysis for Color Indexing
Xiang-Yan ZENG Yen-Wei CHEN Zensho NAKAO Jian CHENG Hanqing LU
IEICE TRANSACTIONS on Information and Systems
Publication Date: 2004/04/01
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Pattern Recognition
color indexing, color histogram, content-based image retrieval, principal component analysis, independent component analysis,
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Color histograms are effective for representing color visual features. However, the high dimensionality of feature vectors results in high computational cost. Several transformations, including singular value decomposition (SVD) and principal component analysis (PCA), have been proposed to reduce the dimensionality. In PCA, the dimensionality reduction is achieved by projecting the data to a subspace which contains most of the variance. As a common observation, the PCA basis function with the lowest frquency accounts for the highest variance. Therefore, the PCA subspace may not be the optimal one to represent the intrinsic features of data. In this paper, we apply independent component analysis (ICA) to extract the features in color histograms. PCA is applied to reduce the dimensionality and then ICA is performed on the low-dimensional PCA subspace. The experimental results show that the proposed method (1) significantly reduces the feature dimensions compared with the original color histograms and (2) outperforms other dimension reduction techniques, namely the method based on SVD of quadratic matrix and PCA, in terms of retrieval accuracy.