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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

[en] SPATIAL FILTERS APPLICATION TO THE RESTAURATION OF NON-DESTRUCTIVE ESSAY MAGNETIC IMAGES / [pt] APLICAÇÃO DE FILTROS ESPACIAIS À RESTAURAÇÃO DE IMAGENS MAGNÉTICAS OBTIDAS EM ENSAIOS NÃO-DESTRUTIVOS

EDUARDO ANDRADE LIMA 26 July 2006 (has links)
[pt] Desenvolveu-se uma técnica de restauração de imagens de defeitos existentes em materiais ferromagnéticos, obtidas pela solução do problema inverso para sinais simulados proveniente do método de Ensaios Não-Destrutivos conhecido como Magnetic Flux Leakage. Baseada em princípios de filtragem ótima, a técnica visa reduzir distorções introduzidas nas imagens pela Inversa MNSL (Minimum-Norm Least-Squares Inverse). Com a aplicação desta técnica, é possível caracterizar mais precisamente diversos tipos de defeitos. / [en] Na image processing technique was developed to restore images of defects in ferromagnetic materials. Such images are obtained by solving the eletromagnetic inverse problem associated with the Magnetic Flux Leakage method of Nondestructive Evaluation. Based upon optimal filtering, the technique aims to reduce distortions introduced by the Minimum-Norm Least-Square Inverse. By applying such technique it is possible to better characterize various defect types.

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