Fig. 4
From: RSAtrace3D: robust vectorization software for measuring monocot root system architecture
Three vectorization algorithms. “Straight,” “Spline,” and “COG tracking” were implemented. The red, green, and yellow circles indicate the base, registered, and interpolated nodes, respectively. In “COG tracking,” from the terminal node on the other side of the base node, the COG at the narrow area toward the base node (the dashed triangles) is calculated and interpolates the node at the COG-based position, which is repeated until the base node is reached. Polylines are drawn by connecting the adjacent nodes