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15. 12. 2011.
Image retrieval using annular histograms of simple binarized feature vectores generated from DCT coefficients
The discrete cosine transform (DCT) is a widely used technique in content image retrieval. This transform concentrate signal energy into lower order coefficients. In this paper, the construction of DC feature vector and three type of simple binarized feature vectors generated from AC DCT coefficients is presented. Next, in order to capture spatial layout information, annular histograms of introduced feature vectors are described. Despite of the simplicity of introduced binarized feature vectors, experimental results shows that these vectors can contribute to the overall retrieval performances.