Wavelet transform application to fast search by content in database of images

The paper presents a fast access method to images in a conventional DB (DataBase). The method is based on two-dimensional wavelet transform of images preliminary normalized by size, orientation and intensity. The image content for search is considered the normalized image graphics that should be well localizable into the input query picture. The most essential image data are represented as a key of fixed length, on which the fast access is performed using the index access methods of a conventional DB management system. The method is experimented on a DB of about 4000 images of trademarks.