Fig. 6: Examples illustrating the use of local variance filter for grain boundary identification.
From: Machine learning enabled autonomous microstructural characterization in 3D samples
2D images of polycrystalline grain samples are reproduced with permission from Campbell et al.36 and Groeber et al.15 The method can handle both bright field and dark field images and is only sensitive to local variance of pixel intensity which eliminates problems associated with direct thresholding based on absolute pixel intensity.
