Fig. 1. Flow chart of image preprocessing

Fig. 2. Flow chart of selective enhancement factor

Fig. 3. Flow chart of image segmentation

Fig. 4. Comparison of the moss images and the original images. (a) Enhanced leaf image 1; (b) original image 1; (c) enhanced leaf image 2; (d) original image 2; (e) enhanced leaf image 3; (f) original image 3; (g) enhanced leaf and shadow image; (h) original image 4; (i) enhanced shadow image 5; (j) original image 5; (k) enhanced shadow image 6; (l) original image 6

Fig. 5. Comparison of shadow segmentation. (a)(c)(e)(g)(i)(k) Shadow segmentation based on the algorithm in Ref.[3]; (b)(d)(f)(h)(j)(l) shadow segmentation based on the proposed algorithm

Fig. 6. Comparison of leaf segmentation. (a)(c)(e)(g)(i)(k) leaf segmentation based on the algorithm in Ref.[14]; (b)(d)(f)(h)(j)(l) leaf segmentation based on the proposed algorithm

Table 1. Comparisons of shadow distinguish

Table 2. Comparisons of leaf distinguish