Fast three-dimensional form measurement system

Mueller, Ernst

doi:10.1117/12.205681

Cited by 23 publications

(7 citation statements)

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“…This approach can be traced back to early work in fringe projection with gray coding to identify fringe order in 1995 [15]. Gray coding utilized a temporal sequence of binary intensity patterns where the period was increased by a factor of 2 between each image in the sequence (effectively defining a scaling factor of 2) and the temporal sequence at each pixel identifies the fringe order.…”

Section: Beat Techniques For Interferometric Fringe Order Calculationmentioning

confidence: 99%

Extended range metrology: an age old problem

Towers

Falaggis

2011

SPIE Proceedings

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Interferometric metrology is well established for both single point and full field measurements. However, absolute techniques for long range measurements, spanning 100's to 10,000's of fringe orders whilst maintaining sub-fringe resolution have been reported with widely varying levels of performance.In this paper, techniques for long range multi-wavelength interferometry are reviewed with respect to applications of classical interferometry and fringe projection profilometry. Whilst hierarchical geometric series methods provide a potential solution it is shown that significantly greater freedom in wavelength selection is obtained by applying excess fraction principles and a new predictive model for this technique is discussed.

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Section: Beat Techniques For Interferometric Fringe Order Calculationmentioning

confidence: 99%

Extended range metrology: an age old problem

Towers

Falaggis

2011

SPIE Proceedings

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“…. 1); (2) accurate values are Aϭ68.74 mm, Bϭ67.32 mm, Cϭ100.62 mm (measured with the vernier calliper whose measurement accuracy is 0.02 mm); (3) x is the displacement of symmetric line of the sample section in OXYZ coordinates; and (4) ␣ (in degrees) is the rotating angle of the sample around the Z axis. U-shaped wall.…”

Section: Experiments In the Industrial Environmentmentioning

confidence: 99%

“…1 So far, many image analysis methods and algorithms 2,3 have been studied for different applications, such as the sine wave structured light illumination for reconstructing the surface topology, 4 the encoded light method with a single image for performance in a dynamic environment, 5 and the image segmentation for inspecting 3-D object sizes. 6 In this paper, according to the concrete requirements of a rolling factory in China, a method is proposed that employs plane-structured light illumination and 2-D binary pattern analysis.…”

Section: Introductionmentioning

confidence: 99%

Online fast measurement of section sizes of three-dimensional objects using binary image analysis

et al. 1998

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We propose a method for online measurement of section sizes of hot-rolled sections. We consider two main points. First, section sizes of the measured workpiece depend on its section outline; here the section outline is presented by perpendicularly intersecting the workpiece with an optical plane. Second, online measurement of section sizes is almost a real-time process; here to shorten the measurement period, the recording process and the initial extraction process of one section outline are combined by recording it as three 2-D binary patterns. These patterns come from three areas of the section outline and are sufficient for calculating the section sizes. The experimental performance of this method was tested and verified in our laboratory and in a rolling mill in China. A set of the tests are presented. © 1998 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(98)

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“…An overview of 3-D shape measurement using various optical methods was provided by Chen et al 1 The merits of structured light method, also categorized as active triangulation, are (1) easy implementation, (2) fast full-field measurement, and (3) phase shifting with the fringe density and the direction change implemented without moving parts if computer-controlled liquid crystal on silicon (LCoS)/digital light processing (DLP) is used. [2][3][4] However, the optical properties of the object surface affect the accuracy; thus, a variety of optical 3-D shape measurement methods have been proposed for shiny surfaces. 5,6 Nevertheless, for an object with a very high dynamic range (HDR) of its surface reflectivity, all these proposed methods are potentially problematic.…”

Section: Introductionmentioning

confidence: 99%

Projection moiré profilometry with high-dynamic range image

Chou

Cho

et al. 2012

Opt. Eng

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As a type of optical measuring apparatus, the charge-coupled diode (CCD) camera provides the capability of increasing the speed of measurement by inspecting an area with only one shot. However, the CCD camera's high-variation range of reflectivity presents an exceptional challenge for the optical measurement established on the surface. We present a method that could enable one to acquire an image with a highdynamic range in one shot without any reduction in spatial resolution. Because of the sufficient signal-to-noise ratio, the method presented could perform the robustness of the phase-retrieving algorithm, and the surface topography could be measured more accurately.

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Fast three-dimensional form measurement system

Cited by 23 publications

References 0 publications

Extended range metrology: an age old problem

Extended range metrology: an age old problem

Online fast measurement of section sizes of three-dimensional objects using binary image analysis

Projection moiré profilometry with high-dynamic range image

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