1 October 2008 Deformation image generation for testing a strain measurement algorithm
Author Affiliations +
Optical Engineering, 47(10), 107202 (2008). doi:10.1117/1.2993319
Abstract
An optical extensometer was tested using artificially deformed images with a known strain field. A real image series from a tensile test was used to obtain realistic deformation parameters, including spatial and temporal strain characteristics, changes in tonal pixel properties due to deformation, and the effect of nonuniform illumination. These parameters are used to artificially deform a real image taken from an object with a random speckle pattern. The signal-to-noise ratio of the resulting artificially deformed images is varied by applying a blurring pillbox filter and additive Gaussian noise to them. The optical extensometer uses digital image correlation to track homologous points of the object, and further to measure strains. The strain measurement algorithm includes a heuristic to dynamically control the template size in image correlation. Furthermore, several other methods to improve the accuracy-complexity ratio of the algorithm exist. The effects of different parameters and heuristics on the accuracy of the algorithm as well as its robustness against blur and noise are studied. Results show that the proposed test method is practical, and the heuristics improve the accuracy and robustness of the algorithm.
Janne T. Koljonen, Jarmo T. Alander, "Deformation image generation for testing a strain measurement algorithm," Optical Engineering 47(10), 107202 (1 October 2008). http://dx.doi.org/10.1117/1.2993319
JOURNAL ARTICLE
13 PAGES


SHARE
KEYWORDS
Signal to noise ratio

Error analysis

Optimization (mathematics)

Optical engineering

Genetic algorithms

Image registration

Motion models

RELATED CONTENT

Design of M-band filter banks based on wavelet transform
Proceedings of SPIE (November 01 1991)
Design of a 3D-IC multi-resolution digital pixel sensor
Proceedings of SPIE (April 29 2016)
Normal map compression based on BTC and wavelet coding
Proceedings of SPIE (February 26 2008)
Genetic algorithm for designing materials
Proceedings of SPIE (March 22 1999)

Back to Top