Detection and extraction of edges in ICT digital images of turbine blades
Yi Fan · Journal of Northwest University · 2005
Aim To detcet the location of edges and extract the coordinates of the characteristics based on the industrial computer tomography(ICT) and its slices pictures with blurring and noise.Methods Within a interactive defined orientable rectangular region of interest,a group of equidistant parallel lines which are vertical to the one side of the rectangular will be created with the line spacing according to the number of finding edge points in this region.Results Every line profile is fitted by using cubic or B-spline and edges are detected by finding zero-crossings,namely the second deriatives of the cubic or B-spline curve are equal to zero.Conclusion The experiment is carried out to prove this approach to be provided not only with one fourth of sub-pixel accuracy for edge detection and extraction,but also with high efficiency and little computationally expense.