Improved Maize Plant Contour Extraction Method

Fig. 3. Experimental maize plant images. (a) One bud with three leaves 30°; (b) one bud with three leaves 45°; (c) one bud with three leaves 45°; (d) one bud with four leaves 15°

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Fig. 4. Comparison of different algorithms

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Fig. 5. Effect of each contour extraction algorithm. (a)HSV; (b) proposed method; (c) HSV after noise reduction; (d) proposed method after noise reduction

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Table 0. [in Chinese]

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Table 0. [in Chinese]

Algorithm 1 RANSAC

Inputs：Dataset K

1：Initialize dataset K

2：Initialize expected iterations N

3：for N from 0 to n-1 do

4： Repeat

5： Randomly select m samples from Dataset K for model fitting

6： Selected range ɛ as the fitting interval

7： Count the number $N_{n u m}$ of points in interval ɛ

8： If

9： $N_{n u m}$ greater than an acceptable threshold t，refitting the data sample points

10： Otherwise

11： Set the current model M as the best model

12： End algorithm

13： Until n is not less than the present termination times

14：Set model M in the model set $M_{n}$ ，which with the smallest fitting error in the previous step as the best model

Output：Model M

Table 1. Comparison of the time, the number of feature points, the number of matching, and the accuracy of each algorithm
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Table 1. Comparison of the time, the number of feature points, the number of matching, and the accuracy of each algorithm
Algorithm Time /s Keypoints 1 Keypoints 2 $N_{c}$ / $N_{s}$ $R_{c}$ /%
SIFT 1.293 170 116 11/50 22.00
SURF 1.845 660 238 28/50 56.00
ORB 0.638 794 609 32/50 64.00
F-B 0.534 384 282 42/50 84.00

Table 2. Comparison of the time, the number of feature points, the number of matching, and the accuracy of each algorithm
View table
Table 2. Comparison of the time, the number of feature points, the number of matching, and the accuracy of each algorithm
Algorithm Time /s Keypoints 1 Keypoints 2 $N_{c}$ / $N_{s}$ $R_{c}$ /%
SIFT 2.228 308 87 23/50 46.00
SURF 3.912 2276 957 39/50 78.00
ORB 1.157 800 800 26/50 52.00
F-B 0.802 818 585 43/50 86.00

Table 3. Proportion and difference of different methods in each contour extraction algorithm
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Table 3. Proportion and difference of different methods in each contour extraction algorithm
Algorithm Canny Sobel Laplacian Roberts Prewitt
$R_{p}$ 2.01 7.18 2.29 6.49 7.47
$R_{H S V}$ 1.33 6.44 2.13 5.55 6.11
$C_{d}$ 0.68 0.74 0.16 0.94 1.36

Table 4. Proportion and difference of different methods in each contour extraction algorithm 2
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Table 4. Proportion and difference of different methods in each contour extraction algorithm 2
Algorithm Canny Sobel Laplacian Roberts Prewitt
$R_{p}$ 1.53 7.95 2.40 7.09 7.89
$R_{H S V}$ 1.30 7.71 2.15 6.82 7.40
$C_{d}$ 0.23 0.24 0.25 0.27 0.49

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Jinxin Liang, Le Zhang, Yuyao Meng, Jie Teng, Quanling He, Leiyang Fu, Shaowen Li. Improved Maize Plant Contour Extraction Method[J]. Laser & Optoelectronics Progress, 2023, 60(12): 1210004

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Paper Information

Category: Image Processing

Received: Jan. 17, 2022

Accepted: Jun. 13, 2022

Published Online: Jun. 5, 2023

The Author Email: Shaowen Li (shwli@ahau.edu.cn)

DOI:10.3788/LOP220561

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 0. [in Chinese]

Table 0. [in Chinese]

Table 1. Comparison of the time, the number of feature points, the number of matching, and the accuracy of each algorithm

Table 1. Comparison of the time, the number of feature points, the number of matching, and the accuracy of each algorithm

Table 2. Comparison of the time, the number of feature points, the number of matching, and the accuracy of each algorithm

Table 2. Comparison of the time, the number of feature points, the number of matching, and the accuracy of each algorithm

Table 3. Proportion and difference of different methods in each contour extraction algorithm

Table 3. Proportion and difference of different methods in each contour extraction algorithm

Table 4. Proportion and difference of different methods in each contour extraction algorithm 2

Table 4. Proportion and difference of different methods in each contour extraction algorithm 2