Correction Method of Shadow-Area Phase Noise Based on Improved Monotone Method

Tao Sijie; Bai Ruilin; Wang Changlong

doi:10.3788/LOP57.021503

Laser & Optoelectronics Progress, Volume. 57, Issue 2, 21503(2020)

Correction Method of Shadow-Area Phase Noise Based on Improved Monotone Method

Tao Sijie, Bai Ruilin^*, and Wang Changlong

Key Laboratory of Advanced Process Control for Light Industry (Ministry of Education), School of Internet of Things Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China

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Figures & Tables(9)

Fig. 1. Phase unwrapping

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Fig. 2. Field of view of camera

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Fig. 3. Phase unwrapping result of workpieces (left camera). (a) Grating stripe; (b) phase unwrapping

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Fig. 4. Absolute phase values of the 315th line. (a) Phase value before correction; (b) phase value after correction

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Fig. 5. System construction and data collection. (a) Structured light measurement system; (b) grating stripe

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Fig. 6. Full-field continuous absolute phase at frequency of 1/64 (left camera). (a) Absolute phase before correction; (b) absolute phase corrected by monotonic method; (c) absolute phase corrected by proposed method; (d) absolute phaseheight before correction; (e) absolute phase height corrected by monotonic method; (f) absolute phase height corrected by proposed method

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Fig. 7. Three-dimensional point cloud andtriangular plate model of five kinds of workpieces. (a) Grating projection; (b) absolute phase height before correction (left camera); (c) absolute phase height corrected by proposed method; (d) three-dimensional point cloud; (e) triangular plate model

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Table 1. Standard deviation of triangular plate model of five kinds of workpieces

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Table 1. Standard deviation of triangular plate model of five kinds of workpieces

Sample	Standard deviation ofmonotonic method /mm	Standard deviation ofproposed method /mm	Relative deviation /%
Wooden cylinder	0.2465	0.0978	60.32
Cuboid block	0.0799	0.0250	68.71
Metal cylinder	0.1768	0.1070	39.48
Plastic bottle	0.1615	0.0944	41.55
Stacked cylinder	0.8552	0.4030	52.88

Table 2. Fitting results of diameter and height of cylindrical workpiecemm

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Table 2. Fitting results of diameter and height of cylindrical workpiecemm

Index		1^st measure	2^nd measure	3^rd measure	4^th measure	5^th measure
Measured	Monotonic method	59.8426	60.0841	59.8944	59.8139	60.1214
height	Proposed method	59.9655	59.9882	59.9304	60.0113	59.9756
Difference	Monotonic method	0.2174	-0.0241	0.1656	0.2461	-0.0614
of height	Proposed method	0.0945	0.0718	0.1296	0.0487	0.0848
Measured	Monotonic method	29.0768	29.1656	29.3277	29.1317	29.3213
diameter	Proposed method	29.1156	29.2620	29.2753	29.2377	29.1275
Difference	Monotonic method	0.1232	0.0344	-0.1277	0.0683	-0.1213
of diameter	Proposed method	0.0844	-0.062	-0.0753	-0.0377	0.0725

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Tao Sijie, Bai Ruilin, Wang Changlong. Correction Method of Shadow-Area Phase Noise Based on Improved Monotone Method[J]. Laser & Optoelectronics Progress, 2020, 57(2): 21503

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Paper Information

Category: Machine Vision

Received: May. 10, 2019

Accepted: --

Published Online: Jan. 3, 2020

The Author Email: Bai Ruilin (18861823498@163.com)

DOI:10.3788/LOP57.021503

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology