Full-field 3D shape measurement of specular surfaces by direct phase to depth relationship

Zhang, Zonghua; Liu, Yue; Huang, Shujun; Niu, Zhenqi; Guo, Jun; Gao, Nan; Gao, Feng; Jiang, Xiangqian

doi:10.1117/12.2246144

Cited by 11 publications

(9 citation statements)

References 17 publications

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“…To further advance the development of PMD, two improved deflectometry methods of direct PMD (DPMD) [ 98 , 99 , 100 , 101 ] and model PMD (MPMD) [ 102 , 103 , 104 ] have been presented, which will be reviewed in the following two subsections, respectively.…”

Section: Improved Phase-measuring Deflectometrymentioning

confidence: 99%

“…A new direct PMD (DPMD) method has been developed to solve the problems of the existing classical PMD methods, as illustrated in Figure 6 [ 98 , 99 , 100 ]. DPMD builds a direct relationship between the phase and the depth, so that the 3D shape of the specular object is calculated directly from the phase data, instead of integrating the local slope data which are also obtained from the phase data.…”

Section: Improved Phase-measuring Deflectometrymentioning

confidence: 99%

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Three-Dimensional Shape Measurements of Specular Objects Using Phase-Measuring Deflectometry

Zhang

Wang

Huang

et al. 2017

Sensors

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The fast development in the fields of integrated circuits, photovoltaics, the automobile industry, advanced manufacturing, and astronomy have led to the importance and necessity of quickly and accurately obtaining three-dimensional (3D) shape data of specular surfaces for quality control and function evaluation. Owing to the advantages of a large dynamic range, non-contact operation, full-field and fast acquisition, high accuracy, and automatic data processing, phase-measuring deflectometry (PMD, also called fringe reflection profilometry) has been widely studied and applied in many fields. Phase information coded in the reflected fringe patterns relates to the local slope and height of the measured specular objects. The 3D shape is obtained by integrating the local gradient data or directly calculating the depth data from the phase information. We present a review of the relevant techniques regarding classical PMD. The improved PMD technique is then used to measure specular objects having discontinuous and/or isolated surfaces. Some influential factors on the measured results are presented. The challenges and future research directions are discussed to further advance PMD techniques. Finally, the application fields of PMD are briefly introduced.

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Section: Improved Phase-measuring Deflectometrymentioning

confidence: 99%

Section: Improved Phase-measuring Deflectometrymentioning

confidence: 99%

Three-Dimensional Shape Measurements of Specular Objects Using Phase-Measuring Deflectometry

Zhang

Wang

Huang

et al. 2017

Sensors

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“…Although the accuracy can be guaranteed by the usage of additional precise instruments, the operation is laborious and the equipment is very expensive. (ii) Using a reference planar mirror with markers printed on it [10,24,25]. These methods indirectly calibrate the pose between the screen and the camera by the position of the reference mirror.…”

Section: Introductionmentioning

confidence: 99%

An Accurate Calibration Means for the Phase Measuring Deflectometry System

Han

Song

2019

Sensors

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Calibration is a critical step for the phase measuring deflectometry system. Existing calibration methods are mainly optimizing the calibration parameters with respect to the 2D re-projection error criterion. However, such a procedure cannot reduce metric errors in the practical application. Therefore, an accurate and practical calibration method is proposed. In which, conventional calibration means is first applied for the primary calibration. Then, a precise square planar mirror is used for the optimization of system calibration parameters. All the intrinsic and extrinsic parameters are considered as a global multi-objective optimization problem. Three metric error criteria are introduced to evaluate the 3D reconstruction accuracy of the reference mirror. Compared with classical calibration means, which apply the parameter optimization in 2D image space to minimize the re-projection errors, the proposed optimization approach is executed in 3D space directly. An experiment and comparison are conducted to verify that the proposed optimal calibration approach can effectively reduce the system deviation and to improve the system measurement accuracy.

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“…A novel DPMD (direct PMD) method that can obtain the full-field 3D shape of specular objects with discontinuous and/or isolated surfaces has been developed to solve the problem of measuring complex specular surfaces [36][37][38]. This method builds a direct relationship between the absolute phase and the depth information.…”

Section: Introductionmentioning

confidence: 99%

A Calibration Method for System Parameters in Direct Phase Measuring Deflectometry

2019

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Phase measuring deflectometry has been widely studied as a way of obtaining the three-dimensional shape of specular objects. Recently, a new direct phase measuring deflectometry technique has been developed to measure the three-dimensional shape of specular objects that have discontinuous and/or isolated surfaces. However, accurate calibration of the system parameters is an important step in direct phase measuring deflectometry. This paper proposes a new calibration method that uses phase information to obtain the system parameters. Phase data are used to accurately calibrate the relative orientation of two liquid crystal display screens in a camera coordinate system, by generating and displaying horizontal and vertical sinusoidal fringe patterns on the two screens. The results of the experiments with an artificial specular step and a concave mirror showed that the proposed calibration method can build a highly accurate relationship between the absolute phase map and the depth data.

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Full-field 3D shape measurement of specular surfaces by direct phase to depth relationship

Cited by 11 publications

References 17 publications

Three-Dimensional Shape Measurements of Specular Objects Using Phase-Measuring Deflectometry

Three-Dimensional Shape Measurements of Specular Objects Using Phase-Measuring Deflectometry

An Accurate Calibration Means for the Phase Measuring Deflectometry System

A Calibration Method for System Parameters in Direct Phase Measuring Deflectometry

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