Fig. 1. Schematic of experimental site

Fig. 2. Schematic of geometrical relationship at scanning

Fig. 3. Fitting error and running time as a function of the polynomial order

Fig. 4. Laser intensity of trunks with different ages (data followed by different capital letters represents difference less than 0.05 significance level between trunks, lowercase letters represent difference less than 0.05 significance level in trunks). (a) 1-year old trunks; (b) 2-year old trunks; (c) 3-year old trunks; (d) 4-year old trunks

Fig. 5. Relationship between laser intensity and trunks with different ages

Table 1. Original and corrected intensity of 1-year bamboo

Table 2. Significance analysis of laser intensity in trunks with different ages

Table 3. Significance analysis of laser intensity in trunks and between trunks with different ages

Table 4. Parameters and r2 for fitting laser intensity of trunks with different ages

Table 5. Results of distinguishing bamboo age