Robust L-Isomap with a Novel Landmark Selection Method

Figure 7

Comparison of RL-Isomap with Robust Kernel Isomap for the case of Toroidal Helix data. (a) The Toroidal Helix data. (b) The -nearest neighbourhood graph with . (c) Neighbourhood graph constructed by Robust Kernel Isomap. (d) The new neighbourhood graph after removing the edges whose edge density values are below the threshold. (e) The landmark candidate points. (f) The landmark points. (g) Embedding result by Robust Kernel Isomap. (h) Embedding result by RL-Isomap.

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