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• W633310272 abstract "Content-Based Image Retrieval Systems (CBIR) aims at searching in large collections of images, retricving those whose contents are similar to an image given as part of the search predicate. Similarity is a relationship between a pair of images that enables t.heir comparison, whieh is expressed by a distance (dissimilarity) function. Distance functions usnally rely on a set of features extracted from eacli image by a set of image processing algorithms called featurc extractors. To speed up the search process, selected features are extractcd from each image when cach one is stored in a image database crcating a feature vector for each image. Further image searching operations are performed using the featurc vectors in place of the images. Before extracting features, other image processing algorithms are usually employed to pre-process each image, preparing it for the extractors. Moreover, usually there are several criteria that can be considered wlicn measuring how mueh two images are similar. In currcnt CBIR, cnvironments, to compare images, one must define (1) the criteria, (2) the pre-processing needed before the extractors can be executed, (3) whic:h are those extractors, (4) which features must be considered, (5) and which distance function must be used. Ali of these definitions must have been set before a comparison can be performed. The eomplexity of defining how to comparei images has lead to the development, of systems aiming CBIR that allow relativelv few options to configure the image comparison operations. Moreover, no formal representation of the entire CBIR process exists. This work presents a formal representation of the complete set. of operations composing the CBIR process, aiming to search images in large relational databases, using similarity queries. It is also reported a system developed using this formalism that enables the content-based retrieval of medicai images from a hospital database, thus showing results of applying the presented formalism in a praetieal way." @default.
• W633310272 created "2016-06-24" @default.
• W633310272 creator A5087789500 @default.
• W633310272 date "2015-10-16" @default.
• W633310272 modified "2023-09-25" @default.
• W633310272 title "Formalização do domínio imagem para buscas por conteúdo em SGBDs relacionais" @default.
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