Figure 20From: Micro-crack detection of multicrystalline solar cells featuring an improved anisotropic diffusion filter and image segmentation techniquePrincipal component analysis of shape features comparing ART with other standard shape descriptors. (a) ART, (b) FD, (c) GFD, and (d) RCF. Here, the filled circle represents arbitrary shapes, the plus sign indicates micro-crack shapes, and the filled triangle symbolizes the centroid of each group.Back to article page