Speckle Cross-Correlation Method in Measuring Fine Surface Displacements

Sub-pixel precision image matching for measuring surface displacements on mass movements using normalized cross-correlation

Surface Roughness Measurement on a Wing Aircraft by Speckle Correlation

The study of the damage of aeronautical materials is important because it may change the microscopic surface structure profiles. The modification of geometrical surface properties can cause small instabilities and then a displacement of the boundary layer. One of the irregularities we can often find is surface roughness. Due to an increase of roughness and other effects, there may be extra mome...

The Improvement in Measuring Position and Orientation of Laparoscopic Tools Using the Cross Correlation Method

A new ultrasound wireless positioning system is developed that gives the surgeon the exact 3D location and orientation of the instruments in the patient. The measuring system employs ultrasound markers/ transmitters placed on the instruments, outside of the human body. Knowing the dimensions of the usually rigid instruments it is possible to calculate their position and orientation inside the p...

From Surface Roughness to Surface Displacements

This paper presents an extension to a measurement system to capture bidirectional refEectance distribution function (BRDF) values and texture maps out of images. The extension will enable the measurement of reflection effects due to surface roughness and additionally extracts a map representing local surface displacements. Different lighting conditions where used to discriminate between surface...

On measuring surface wave phase velocity from station-station cross-correlation of ambient signal

7 We apply two different algorithms to measure surface-wave phase velocity, as a function of 8 frequency, from seismic ambient noise recorded at pairs of stations from a large European 9 network. The two methods are based on consistent theoretical formulations, but differ in the 10 implementation: one method involves the time-domain cross-correlation of signal recorded 11 at different stations;...