Segmentation images. (a) Image no. 247076 compressed to 25 : 1. (b) Image no. 246215. These two images from different eyes generated templates, but their qualities resulted in poor segmentation. As a result, in the template comparisons there was only one valid bit compared, resulting in a false match using raw HD, (HD = 0.0). Normalized HD would have resulted in an HD = 0.5 (no false match). Also, the iCAP software version used in this research was an early version that did not include capability for off-axis images or partially out-of-frame images. The fact that these images did not segment properly could be expected.