Fig. 8.

Validation results of seedling counting model of different densities and leaf ages. The datasets are these images for model validation (720 observations), and each treatment has 60 data. The densities of images from the first line to the fourthly are 75 × 10⁴ plants ha⁻¹, 150 × 10⁴ plants ha⁻¹, 225 × 10⁴ plants ha⁻¹, 300 × 10⁴ plants ha⁻¹