Knowing the strain response of materials in strength tests
is one of the main issues in construction and engineering fields. In these
tests, information about displacements and strains is usually carried out
using physical devices attached to the material.
In this paper, the suitability of Computer Vision techniques to analyse
strength tests without interfering with the assay is discussed and a new
technique is proposed.
This technique measures displacements and deformations from a video
sequence of the assay.
With this purpose a Block-Matching Optical Flow algorithm is integrated
with a calibration process to extract the vectorfield from the
displacement in the material.
To evaluate the proposed technique, a synthetic image set and a real
sequence from a strength tests were analysed.