Research on Imaging Quality Comprehensive Evaluation by Multi-Parameters of Line Structured Light Stripe

Taotao Li; Pei Shen; Xiaoqian Zhong; Xianlei Xu; Jiangying Liu

doi:10.3788/LOP220829

Laser & Optoelectronics Progress, Volume. 60, Issue 7, 0712005(2023)

Research on Imaging Quality Comprehensive Evaluation by Multi-Parameters of Line Structured Light Stripe

Taotao Li^1、*, Pei Shen¹, Xiaoqian Zhong¹, Xianlei Xu², and Jiangying Liu¹

Author Affiliations

¹School of Electromechanical Engineering, Pingxiang University, Pingxiang 337055, Jiangxi, China

²State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, China

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Figures & Tables(11)

Fig. 1. One-dimensional image entropy changes of light stripe image set

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Fig. 2. Local contrast changes of light stripe image set

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Fig. 3. Definition coefficient changes of light stripe image set

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Fig. 4. Synchronous changes of light stripe image set's H, C, β,and stripe centers extraction deviation R_a

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Fig. 5. Light stripe imaging results of metal plate under different exposure time t. (a) t=200 μs; (b) t=1000 μs; (c) t=2000 μs; (d) t=2500 μs; (e) t=5000 μs

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Fig. 6. Hign-precision rack

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Fig. 7. 3D measurement results of 7^th tooth in high-precision rack. (a) 3D reconstruction of tooth profile; (b) R_ssa varies with t

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Table 1. Corresponding t and H ranges of light stripe imaging quality empirical evaluation results

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Table 1. Corresponding t and H ranges of light stripe imaging quality empirical evaluation results

Characteristic parameter	High quality light stripe image	Poor quality light stripe image
Characteristic parameter	Region #2	Region #1	Region #3
Exposure time t /μs	500-4000	100-500	4000-15000
One-dimensional image entropy H	2.73-5.46	1.68-2.73	5.46-7.06
Image local contrast C	0.5-0.7	0.7-1.0	0-0.5

Table 2. Value ranges of H, C, β,and R_a of high quality light stripe images in image set U

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Table 2. Value ranges of H, C, β,and R_a of high quality light stripe images in image set U

Evaluation parameter	Value range
Exposure time t /μs	1200 ≤ t ≤ 2700
One-dimensional image entropy H	3.81 ≤ H ≤ 4.90
Image local contrast C	0.50 ≤ C ≤ 0.56
Light stripe definition coefficient β	0.95 ≤ β ≤ 1.00
Stripe centers extraction deviation R_a	0.26 ≤ R_a≤ 0.30

Table 3. Multi-parameters comprehensive evaluation results of light stripe images in Fig. 5

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Table 3. Multi-parameters comprehensive evaluation results of light stripe images in Fig. 5

Exposure time t /μs	One-dimensional image entropy H	Image local contrast C	Light stripe definition coefficient β	Comprehensive evaluation result E
200	2.49	0.98	0.31	35.2
1000	3.98	0.56	0.94	97.2
2000	4.64	0.51	0.95	98.4
2500	4.91	0.50	0.93	96.3
5000	6.23	0.46	0.85	70.8

Table 4. Comparison of evaluation results of different methods

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Table 4. Comparison of evaluation results of different methods

Method	Relevant evaluation parameter	Exposure time t /μs	Variation range of R_ssa
Method 1	α≈4.5	2600~3200	0.057~0.090
Method 2	R≈160，D≈2100	800~2000	0.022~0.120
Method 3	L_laser≈210	2200~3000	0.034~0.060
Proposed method	3.81 ≤ H ≤ 4.10，0.52 ≤ C ≤ 0.56，0.95 ≤ β ≤ 1.00	1200~2400	0.022~0.042

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Taotao Li, Pei Shen, Xiaoqian Zhong, Xianlei Xu, Jiangying Liu. Research on Imaging Quality Comprehensive Evaluation by Multi-Parameters of Line Structured Light Stripe[J]. Laser & Optoelectronics Progress, 2023, 60(7): 0712005

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Paper Information

Category: Instrumentation, Measurement and Metrology

Received: Feb. 28, 2022

Accepted: Mar. 30, 2022

Published Online: May. 24, 2023

The Author Email: Taotao Li (ltaotao1988@126.com)

DOI:10.3788/LOP220829

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Corresponding t and H ranges of light stripe imaging quality empirical evaluation results

Table 1. Corresponding t and H ranges of light stripe imaging quality empirical evaluation results

Table 2. Value ranges of H, C, β,and Ra of high quality light stripe images in image set U

Table 2. Value ranges of H, C, β,and Ra of high quality light stripe images in image set U

Table 3. Multi-parameters comprehensive evaluation results of light stripe images in Fig. 5

Table 3. Multi-parameters comprehensive evaluation results of light stripe images in Fig. 5

Table 4. Comparison of evaluation results of different methods

Table 4. Comparison of evaluation results of different methods

Table 2. Value ranges of H, C, β,and R_a of high quality light stripe images in image set U

Table 2. Value ranges of H, C, β,and R_a of high quality light stripe images in image set U