A New Method to Segment X-Ray Microtomography Images of Lamellar Titanium Alloy Based on Directional Filter Banks and Gray Level Gradient

This paper presents a method for segmentation of 2D texture images of titanium alloys. The procedure is fully automated and is able to find and recognize so-called α-colonies from the image. The algorithm combines nonsubsampled directional filter banks (NSDFB) from the contourlet transform and gradient gray-level value to recognize directional orientations of α-colony.