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. A histogram technique that exploits the directional properties of a wavelet transform has been proposed in the literature. Although, this technique provides good retrieval performance for texture images, its complexity is very high. We propose fast wavelet histogram techniques that provide superior performance at a substantially reduced complexity.