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. 2018 Feb 23;6:e4374. doi: 10.7717/peerj.4374

Figure 8. Cross-section (XY plane) through the fossil at various stages of segmentation using RCA and MIA-Clustering.

Figure 8

(A) The fossil scan. (B) The image after foreground inversion. (C) The RCA segmentation of the inverted image overlaid on the original image (red), note the lack of segmentation of central trabeculae (e.g., above the white asterisk). (D) An image preserving the global gradient of the fossil scan but little of its spatial structure, after a strong median filter. (E) The result of merging the global gradient and the inverted image. (F) The RCA segmentation of the merged result overlaid on the original image (blue). (G) The MIA-Clustering segmentation of the three classes in the image. (H) The MIA-Clustering segmentation binarized on the second brightest class, the fossilized bone phase. (I) This binarized segmentation overlaid on the original image (yellow). See text for further details.