ASAME > The stereo-correlation
Correlation by stereo-vision.
The stereo-correlation technique uses the principle of binocular vision that means the measurement of the same object following two different angles.
On this principle, the technique allows to measure the 3D geometry of an object or the displacement for each coordinates of the surface by recording a pair of stereoscopic pictures relating to each stage of deformation.
Measurement principle.
A grid is applied by etching or silk screening on the surface.
A camera calibrates the measurement scene and records two pictures of the object following two different angles.
Each stereoscopic picture is analysed independently to extract the grid dots and then the pictures are automatically connected for a rebuilding by triangulation of the 3D shape.
After deformation of the object, ASAME also analyses the field of displacements of the grid dots to quantify the strain distribution.
More information.
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