
The Statistical Quantized Histogram Texture Features Analysis for Image Retrieval Based on Median and Laplacian Filters in the DCT Domain
An effective Content!Based Image Retrieval (CBIR) system is based on efficient feature extraction and accurate retrieval of similar images. Enhanced images by usi ng proper filter methods can also, play an importa nt role in image retrieval in a compressed frequency domain since cu rrently most of the images are represented in the compressed format by using the Discrete Cosine Transformation ( DCT) blo cks transformation. In compression, some crucial information is lost and perceptual information is left, which has significa nt energy requirement for retrieval in a compressed domain. In this paper, the statistical texture features are extracted from the enhanced images in the DCT domain using only t he DC and first three AC coefficients of the DCT blocks of image having m ore significant information. We study the effect of filters in image retrieval using texture features. We perform an exp erimental comparison of the results in terms of accuracy on the basis of median, median with edge extraction and Laplacian f ilters using quantized histogram texture features in a DCT domain. Experiments using the Corel database, give the impr oved results on the basis of filters; more specifically, the Laplacian filter with sharpened images gives good performance in ret rieval of JPEG format images as compared to the med ian filter in the DCT frequency domain.
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