Fig. 4

Dendrogram of 1000 codewords and anatomical elements corresponding to the codewords belonging to each cluster (a), and visualization of the clusters on a cross section of Cinnamomum camphora (b). The dendrogram was truncated at six clusters, and the numbers in parentheses are the numbers of codewords in the cluster. c corner-based SIFT feature, b blob-based SIFT feature, v vessel, ap axial parenchyma cell, r ray, wf wood fiber. Scale bar 100 μm