Detection of wavefront using Hough transform from time-sequential images recorded by pulsed laser scan

The center location of the side hole (defect) in a solid material is roughly estimated using Hough transform. The measurement data recorded by a pulsed laser scanning system is used for the estimation. The incident and scattering wavefronts are characterized as the plane and conical tracks, respectively, using the stored data. The center location of the side hole is reasonably detected as the vertex coordinates of a conical track that is circularly scattered from the hole with the passage of time, after data preprocessing.