Region-based image annotation using color and texture cues

We present algorithms for automatic image annotation and retrieval based on pixel-based color, and block- or region-based texture features. Region formation has been accomplished by utilizing Gibbs random fields or morphological based operations. Color, and texture indexing may be knowledge-based (using appropriate training sets) or by example. The algorithms are designed to: i) offer the user a wide range of options and flexibilities in order to enhance the outcome of the search and retrieval operations, and ii) provide a compromise between accuracy and computational complexity.