Cross-Correlation and Differential Technique Combination to Determine Displacement Fields

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

Sousa, AMR (Autor) Outra; Xavier, J (Autor) Outra; Mário Vaz (Autor) FEUP; Morais, JJL (Autor) Outra; Filipe, VMJ (Autor) Outra

Revista

Título: Strain

Vol. 47

Páginas: 87-98

ISSN: 0039-2103

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 32 Citações

Scopus - 35 Citações

Outras Informações

ID Authenticus: P-002-HWG

DOI: 10.1111/j.1475-1305.2010.00740.x

Abstract (EN): This study presents a method to measure the displacement fields on the surface of planar objects with sub-pixel resolution, by combining image correlation with a differential technique. First, a coarse approximation of the pixel level displacement is obtained by cross-correlation (CC). Two consecutive images, taken before and after the application of a given deformation, are recursively split in sub-images, and the CC coefficient is used as the similarity measure. Secondly, a fine approximation is performed to assess the sub-pixel displacements by means of an optical flow method based on a differential technique. To validate the effectiveness and robustness of the proposed method, several numerical tests were carried out on computer-generated images. Moreover, real images from a static test were also processed for estimating the displacement resolution. The results were compared with those obtained by a commercial digital image correlation code. Both methods showed similar and reliable results according to the proposed tests.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12