Figure 3

Screenshot of iCluster as an example of image clustering results. The six images extracted from the Plant Organelle Database [6] (Additional file 1: Figure S1) and the 55 images from LIPS dataset III were analyzed with a two-dimensional Sammon map, a clustering algorithm, implemented in iCluster software. The six Plant Organelle Database images are highlighted in red. See also Additional file 1: Figure S2.