Fast wavelet histogram techniques for image indexing

Image histograms have become very popular in image and video indexing applications because of their low complexity. However, histogram-based techniques are not efficient in retrieving texture images. Recently, a histogram technique that exploits the directional properties of wavelet transform has been proposed in the literature. Although, this technique provides a good retrieval performance for texture images, its complexity is very high. In this paper, we propose fast wavelet histogram techniques that provide a superior performance at a substantially reduced complexity.