Fig. 4
From: Automated identification of Lauraceae by scale-invariant feature transform
SIFT keypoints clustered by k-means clustering in the cross-section of Cinnamomum camphora. The images show an enlarged part, and the keypoints are detected in an image of 900 × 900 pixels. The keypoints in each image are mainly located at the cell corners (a), cell lumina (b), vessel and axial parenchyma cells (c), and cell wall of the vessel and ray parenchyma cells (d)