: In the present paper a method to evaluate surface strains is discussed. The algorithm performs the analysis of the two comparing images, before and after the application of loads. The method is based on differential calculation of Jacobian matrix and the solution of an over-determined system of equations. The differential calculation is truncated at the first order and iteratively applied. In this work it is also presented a technique to increase the computation speed by a reduction of the number of system equations. Two different strategies are proposed: a partial grouping of pixels by equation averaging; the use of Hu’s invariants applied to sub-images. The two methods are discussed and compared.
Lux, V., Marotta, E., Salvini, P. (2012). On the use of a differential method to analyze the displacement field by means of digital images. In Proceedings of the International Symposium, CompIMAGE 2012 (pp.415-419). Rome.
On the use of a differential method to analyze the displacement field by means of digital images
MAROTTA, EMANUELE;SALVINI, PIETRO
2012-01-01
Abstract
: In the present paper a method to evaluate surface strains is discussed. The algorithm performs the analysis of the two comparing images, before and after the application of loads. The method is based on differential calculation of Jacobian matrix and the solution of an over-determined system of equations. The differential calculation is truncated at the first order and iteratively applied. In this work it is also presented a technique to increase the computation speed by a reduction of the number of system equations. Two different strategies are proposed: a partial grouping of pixels by equation averaging; the use of Hu’s invariants applied to sub-images. The two methods are discussed and compared.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
