摘要:An experimental Image Retrieval System (EIRS) for fast access based on graphic content to images kept in a conventional database (DB) is under research and development in IIT of BAS. At the present stage, the system can be considered above all as instrumental software for experimenting of three techniques for image search, namely: (i) by a two-dimensional wavelet transform, (ii) by a two-dimensional Fourier transform and (iii) by a heuristic decomposition of the images to contextual contour parts. The search content is the input image itself or a sketch of it. The most essential image data are automatically extracted and arranged in a key string of a fixed length. The fast access is performed on this key data using conventional index access methods of the given DB management system. For the time being, the images the EIRS operates with should be graphic images, gray scale or true color and not very noisy. The system is tested on a DB of about 4000 images of trademarks.