Object localization using color, texture and shape

We address the problem of localizing objects using color, texture and shape . Given a handrawn sketch for querying an object shape. and its color and t exture, the proposed algorithm automatically searches the image database fo r objects which meet the query attributes. The database images do not need to be presegmented or annotated. The proposed algorithm operates in two sta ges. In the first stage, we use local texture and color features to find a small number of candidate images in the database, and identify regions in t he candidate images which share similar texture and color as the query. To speed up the processing, the texture and color features are directly extrac ted from the Discrete Cosine Transform (DCT) compressed domain. In the seco nd stage. we use a deformable template matching method to match the query s hape to the image edges at the locations which possess the desired texture and color attributes. This algorithm is different from other content-based image retrieval algorithms in that: (i) no presegmentation of the database images is needed, and (ii) the color and texture features are directly extr acted from the compressed images. Experimental results demonstrate performa nce of the algorithm and show that substantial computational savings can be achieved by utilizing multiple image cues. (C) 2000 Pattern Recognition So ciety. Published by Elsevier Science Ltd. All rights reserved.