Abstract
A new technique for fully automatic diffraction fringe measurement in pointwise analysis of speckle photographs is presented. The fringe orientation and spacing are initially estimated with the help of a 1 D fast Fourier transform (FFT). A 2-D convolution filter is then applied to enhance the estimated image. A fringe pattern with high signal-to-noise ratio is achieved, which makes feasible precise determination of the displacement components. The halo effect is also optimally eliminated in a new way by a halo-division technique. High reliability and accurate determination of displacement components are achieved over a wide range of fringe densities, with the computation time comparing favorably with those for the 2-D autocorrelation method and the iterative 2-D FFT method.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.