Mesostructure from specularity using gradient illumination

Francken, Yannick; Cuypers, Tom; Bekaert, Philippe

doi:10.1145/1394622.1394637

Cited by 5 publications

(6 citation statements)

References 31 publications

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“…Francken et al [FCB08, FCM*08] propose an extension to this scheme by using coded highlights as in [NSWS90]. The light source used for producing coded illumination is an LCD display.…”

Section: Specular Surface Acquisitionmentioning

confidence: 99%

Transparent and Specular Object Reconstruction

Ihrke

Kutulakos²,

Lensch³

et al. 2010

Computer Graphics Forum

192

154

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This state of the art report covers reconstruction methods for transparent and specular objects or phenomena. While the 3D acquisition of opaque surfaces with lambertian reflectance is a well-studied problem, transparent, refractive, specular and potentially dynamic scenes pose challenging problems for acquisition systems. This report reviews and categorizes the literature in this field. Despite tremendous interest in object digitization, the acquisition of digital models of transparent or specular objects is far from being a solved problem. On the other hand, real-world data is in high demand for applications such as object modeling, preservation of historic artifacts and as input to data-driven modeling techniques. With this report we aim at providing a reference for and an introduction to the field of transparent and specular object reconstruction. We describe acquisition approaches for different classes of objects. Transparent objects/phenomena that do not change the straight ray geometry can be found foremost in natural phenomena. Refraction effects are usually small and can be considered negligible for these objects. Phenomena as diverse as fire, smoke, and interstellar nebulae can be modeled using a straight ray model of image formation. Refractive and specular surfaces on the other hand change the straight rays into usually piecewise linear ray paths, adding additional complexity to the reconstruction problem. Translucent objects exhibit significant sub-surface scattering effects rendering traditional acquisition approaches unstable. Different classes of techniques have been developed to deal with these problems and good reconstruction results can be achieved with current state-of-the-art techniques. However, the approaches are still specialized and targeted at very specific object classes. We classify the existing literature and hope to provide an entry point to this exiting field.

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“…Francken et al [FCB08, FCM*08] propose an extension to this scheme by using coded highlights as in [NSWS90]. The light source used for producing coded illumination is an LCD display.…”

Section: Specular Surface Acquisitionmentioning

confidence: 99%

Transparent and Specular Object Reconstruction

Ihrke

Kutulakos²,

Lensch³

et al. 2010

Computer Graphics Forum

192

154

View full text Add to dashboard Cite

show abstract

“…Depending on the sampling time of the system, high acquisition times preclude its application as an inline system. The method from work [27] uses different illumination patterns to determine the reflection direction between the camera and screen. This method requires a reflective surface and can also be applied using a line scan camera.…”

Section: State Of the Artmentioning

confidence: 99%

“…To extract three-dimensional information from the surface of the rolling elements, the method presented in [27] is to be applied in a modified form. This method can be ideally adapted for use with a line scan camera by using a sufficiently fast exposure device.…”

Section: Deflectometrymentioning

confidence: 99%

“…This method can be ideally adapted for use with a line scan camera by using a sufficiently fast exposure device. The illumination patterns presented in work [27] are used in a modified form. The formulas were adapted for the laboratory setup for rolling element testing.…”

Section: Deflectometrymentioning

confidence: 99%

“…The result represents the gradient field of the surface and will be reconstructed as a virtual surface afterwards (cf. [27]).…”

Section: Deflectometrymentioning

confidence: 99%

See 2 more Smart Citations

Investigation of an Inline Inspection Method for the Examination of Cylinder-like Specular Surfaces Using Deflectometry

et al. 2022

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An optical measuring method is presented, with which it is possible to measure and evaluate reflective cylindrical surfaces using a combination of deflectometry and subsequent reconstruction of the surface. The system is set up and tested on rolling elements of cylindrical roller bearings. However, it is not limited to this use case and can be applied to other cylindrical specular surfaces. The system distinguishes itself from existing test methods through the combination of high-resolution three-dimensional defect measurement with a very short recording time, and offers the possibility of introducing tolerance limits in the production of cylindrical specular surfaces. With this method, it is possible to record a defect with the dimensions of 1.3 mm by 1.8 mm within 5 s and to reconstruct the absolute depth. The resolution of the system is below 10 μm in both X- and Y-direction, and is therefore sufficiently accurate to detect typical surface defects such as scratches, dents, or deformations. To validate the measured values of the system, the results of an artificially generated 10.35 μm deep defect location were compared with those of a highly accurate mechanical stylus measurement.

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Estimating dual-scale properties of glossy surfaces from step-edge lighting

Wang

Snavely

Marschner

2011

Proceedings of the 2011 SIGGRAPH Asia Conference

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Figure 1: Example results of capturing four different surfaces under step-edge illumination. From left to right: painted bookend, metal bookend, shiny black folder, and whiteboard. The upper row shows real photos, and the bottom row shows images synthesized from the parameters acquired by our method. AbstractThis paper introduces a rapid appearance capture method suited for a variety of common indoor surfaces, in which a single photograph of the reflection of a step edge is used to estimate both a BRDF and a statistical model for visible surface geometry, or mesostructure. It is applicable to surfaces with statistically stationary variation in surface height, even when these variations are large enough to produce visible texture in the image. Results are shown from a prototype system using a separate camera and LCD, demonstrating good visual matches for a range of man-made indoor materials.

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Mesostructure from specularity using gradient illumination

Cited by 5 publications

References 31 publications

Transparent and Specular Object Reconstruction

Transparent and Specular Object Reconstruction

Investigation of an Inline Inspection Method for the Examination of Cylinder-like Specular Surfaces Using Deflectometry

Estimating dual-scale properties of glossy surfaces from step-edge lighting

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