Fig. 3
From: Quality visual landmark selection based on distinctiveness and repeatability
![Fig. 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40648-015-0036-9/MediaObjects/40648_2015_36_Fig3_HTML.gif)
Mutual consistency check. Several local feature regions are extracted from four different images. a The red-painted landmark candidate is selected based on the number of arcs. b A landmark with dense feature points is selected if several landmark candidates have the same number of arcs. c When one region has the largest number of arcs but large occlusion reduces the number of observable feature points, it is not selected as a landmark