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In this paper a novel approach to the compression of sparse histogram images is proposed. First, we define a sparsity index which gives hints on the relationship between the mathematical concept of matrix sparsity and the visual information of pixel distribution. We use this index to better understand the scope of our approach and its preferred field of(More)
In this paper we present a way in which the JPEG2000 system architecture structure can be accessed via the network using Web services and dynamically created Web pages. With our approach we are capable of creating an on demand service to extract and insert metadata in .JP2 image files and, using classes even not tuned for this application, we can compute(More)
In this paper we present a CBIR method based on features calculated on edges extracted from wavelet transform coefficients produced by the JPEG 2000 compression algorithm. We compare two different feature extraction schemes used on the edges. We test our algorithm on the novel image database "Amsterdam Library of Object Images ", and we produce an enhanced(More)
In this paper we present a way of making web services and ontologies work together. We have developed a software that exploits the ontology descriptions of web services in order to help their composition. Our system automatically generates and stores the whole ontology layer in a relational database; within this approach, a sort of caching system is created(More)
In this paper we present a novel infrastructure for querying heterogeneous databases composed of semantically annotated documents, using XML technology. We have developed a query generalization system in order to make the use of different XML schemas transparent. It uses a preliminary specification of elements considered equivalent in the various schemas.(More)
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