Characterization of the 3D resolution of topometric sensors based on fringe and speckle pattern projection by a 3D transfer function

Berssenbrügge, Philipp; Dekiff, Markus; Kemper, Björn; Denz, Cornélia; Dirksen, Dieter

doi:10.1016/j.optlaseng.2011.10.006

Cited by 11 publications

(16 citation statements)

References 18 publications

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“…The DoF of our 3D sensor can be evaluated by determining its 3D MTF based on the blurring-induced roundness of a sharp edge. 30,31 For this purpose, we three-dimensionally captured a tilted edge (see Fig. 5(b)) and segmentally determined the 3D MTF over the DoF range via Fourier transform:…”

Section: Depth Of Field Characterizationmentioning

confidence: 99%

Depth-of-field extension in structured-light 3D surface imaging by fast chromatic focus stacking

Heist

Ramm

Mozaffari-Afshar³

et al. 2023

Dimensional Optical Metrology and Inspection for Practical Applications XII

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The depth range that can be captured by structured-light 3D sensors is limited by the depth of field of the lenses which are used. Focus stacking is a common approach to extend the depth of field. However, focus variation drastically reduces the measurement speed of pattern projection-based sensors, hindering their use in high-speed applications such as in-line process control. Moreover, the lenses’ complexity is increased by electromechanical components, e.g., when applying electronically tunable lenses. In this contribution, we introduce chromatic focus stacking, an approach that allows for a very fast focus change by designing the axial chromatic aberration of an objective lens in a manner that the depth-of-field regions of selected wavelengths adjoin each other. In order to experimentally evaluate our concept, we determine the distance-dependent 3D modulation transfer function at a tilted edge and present the 3D measurement of a printed circuit board with comparatively high structures.

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Section: Depth Of Field Characterizationmentioning

confidence: 99%

Depth-of-field extension in structured-light 3D surface imaging by fast chromatic focus stacking

Heist

Ramm

Mozaffari-Afshar³

et al. 2023

Dimensional Optical Metrology and Inspection for Practical Applications XII

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“…Practically, the alternating pattern is produced by a printout. To increase the accuracy of the ESF and to avoid difficulties according to undersampling, these contrast transitions are detected a certain amount of times and are summed up, obtaining an oversampled ESF [5]. This process has the effect whereby the ESF can be determined in one picture instead of the detection of several images by alternating spatial frequencies.…”

Section: Two-dimensional Modulation Transfer Functionmentioning

confidence: 99%

“…Further, a laser range scanner's accuracy is determined using the 3D-MTF procedure, while the influencing parameters, the use of the FFT parameters in the calculation process as well as the angle of the test target are investigated. Subsequently, the approaches of Goesele [4] were analysed and expanded by Berssenbrügge [5]. Hereby, the approaches were enlarged by using a speckle and a fringe pattern measurement system for the 3D-MTF determination process.…”

Section: Introductionmentioning

confidence: 99%

“…Within the scope of this work three different fringe projection systems with various specifications were compared concerning its 3D-MTF transfer characteristics. Therefore, the fringe projection system presented by Berssenbrügge [5] has been adapted to a similar standard setting. Based on this, the differences in the 3D-MTF characteristics between the standard setting and a low cost-, low-resolution hand-held system, as well as a further development filter wheel camera system with defined wavelength optimized spectral detection, were carried out.…”

Section: Introductionmentioning

confidence: 99%

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Characterizing 3D sensors using the 3D modulation transfer function

Kellner

Breitbarth

Zhang

et al. 2018

Meas. Sci. Technol.

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The fields of optical 3D measurement system applications are continuously expanding and becoming more and more diverse. To evaluate appropriate systems for various measurement tasks, comparable parameters are necessary, whereas the 3D modulation transfer function (3D-MTF) has been established as a further criterion. Its aim is the determination of the system response between the measurement of a straight, sharp-edged cube and its opposite ideal calculated one. Within the scope of this work simulations and practical investigations regarding the 3D-MTF’s influences and its main issues are specifically investigated. Therefore, different determined edge radii representing the high-frequency spectra lead to various decreasing 3D-MTF characteristics. Furthermore, rising sampling frequencies improve its maximum transfer value to a saturation point in dependence of the radius. To approve these results of previous simulations, three fringe projection scanners were selected to determine the diversity. As the best 3D-MTF characteristic, a saturated transfer value of has been identified at a sufficient sampling frequency, which is reached at four times the Nyquist limit. This high 3D resolution can mainly be achieved due to an improved camera projector interaction. Additionally, too small sampling ratios lead to uncertainties in the edge function determination, while higher ratios do not show major improvements. In conclusion, the 3D-MTF algorithm has thus been practically verified and its repeatability as well as its robustness have been confirmed.

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“…Approaches employing the fringe projection technique for 3D shape retrieval [6,7] require an additional device for structured illumination. On the other hand, the acquisition of 3D data by automated correlation of a projected laser speckle pattern [8,9] can utilize the same laser that is used for DHI and DSP. Furthermore, it is possible to employ this technique also simultaneously with DHI and DSP.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous acquisition of 3D shape and deformation by combination of interferometric and correlation-based laser speckle metrology

Dekiff¹,

Berssenbrügge²,

Kemper³

et al. 2015

Biomed. Opt. Express

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A metrology system combining three laser speckle measurement techniques for simultaneous determination of 3D shape and micro-and macroscopic deformations is presented. While microscopic deformations are determined by a combination of Digital Holographic Interferometry (DHI) and Digital Speckle Photography (DSP), macroscopic 3D shape, position and deformation are retrieved by photogrammetry based on digital image correlation of a projected laser speckle pattern. The photogrammetrically obtained data extend the measurement range of the DHI-DSP system and also increase the accuracy of the calculation of the sensitivity vector. Furthermore, a precise assignment of microscopic displacements to the object's macroscopic shape for enhanced visualization is achieved. The approach allows for fast measurements with a simple setup. Key parameters of the system are optimized, and its precision and measurement range are demonstrated. As application examples, the deformation of a mandible model and the shrinkage of dental impression material are measured.

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Characterization of the 3D resolution of topometric sensors based on fringe and speckle pattern projection by a 3D transfer function

Cited by 11 publications

References 18 publications

Depth-of-field extension in structured-light 3D surface imaging by fast chromatic focus stacking

Depth-of-field extension in structured-light 3D surface imaging by fast chromatic focus stacking

Characterizing 3D sensors using the 3D modulation transfer function

Simultaneous acquisition of 3D shape and deformation by combination of interferometric and correlation-based laser speckle metrology

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