A full-spherical device for simultaneous geometry and reflectance acquisition

Köhler, Johannes; Noll, Tobias G.; Reis, Gerd; Stricker, Didier

doi:10.1109/wacv.2013.6475040

Cited by 20 publications

(16 citation statements)

References 20 publications

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“…This demonstrates that our streaming and rendering proposed in this paper works independent from the applied acquisition technique and thus other setups tailored for the image-based acquisition of geometry and reflectance, such as [Holroyd et al 2010] and [Köhler et al 2013].…”

Section: Acquisitionmentioning

confidence: 81%

WebGL-based streaming and presentation of objects with bidirectional texture functions

Schwartz

Ruiters

Weinmann

et al. 2013

J. Comput. Cult. Herit.

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Museums and Cultural Heritage institutions have a growing interest in presenting their collections to a broader community via the Internet. The photo-realistic presentation of interactively inspectable virtual surrogates is one of the most challenging problems in this field. For this purpose, we seek to employ not only a 3D geometry but also a powerful material representation capable of reproducing the full visual appeal of an object. In this paper, we propose a WebGL-based presentation framework in which reflectance information is represented via Bidirectional Texture Functions. Our approach works out-of-the-box in modern web browsers and allows for the progressive transmission and interactive rendering of digitized artifacts consisting of 3D geometry and reflectance information. We handle the huge amount of data needed for this representation by employing a novel progressive streaming approach for BTFs which allows for the smooth interactive inspection of a steadily improving version during the download. We demonstrate an interesting use-case of this technique at a cross-section of Cultural Heritage, medical education and research and provide an evaluation of the capabilities of our framework in the scope of BTF compression and transmission.

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Section: Acquisitionmentioning

confidence: 81%

WebGL-based streaming and presentation of objects with bidirectional texture functions

Schwartz

Ruiters

Weinmann

et al. 2013

J. Comput. Cult. Herit.

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show abstract

“…However, while the setup can be disassembled into two parts and is portable in principle, its size and the necessity for calibration after reassembly makes its practical use difficult. Another interesting fully spherical stationary setup with cameras mounted on a rotating arc was proposed by Köhler et al [20] and another possibly portable device with very limited directional resolution by Filip et al [21]. More importantly, with the published approaches, it is not possible to measure the materials on site in any position and orientation.…”

Section: Related Workmentioning

confidence: 99%

Lightdrum—Portable Light Stage for Accurate BTF Measurement on Site

Havran

Hošek

Němcová

et al. 2017

Sensors

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We propose a miniaturised light stage for measuring the bidirectional reflectance distribution function (BRDF) and the bidirectional texture function (BTF) of surfaces on site in real world application scenarios. The main principle of our lightweight BTF acquisition gantry is a compact hemispherical skeleton with cameras along the meridian and with light emitting diode (LED) modules shining light onto a sample surface. The proposed device is portable and achieves a high speed of measurement while maintaining high degree of accuracy. While the positions of the LEDs are fixed on the hemisphere, the cameras allow us to cover the range of the zenith angle from 0∘ to 75∘ and by rotating the cameras along the axis of the hemisphere we can cover all possible camera directions. This allows us to take measurements with almost the same quality as existing stationary BTF gantries. Two degrees of freedom can be set arbitrarily for measurements and the other two degrees of freedom are fixed, which provides a tradeoff between accuracy of measurements and practical applicability. Assuming that a measured sample is locally flat and spatially accessible, we can set the correct perpendicular direction against the measured sample by means of an auto-collimator prior to measuring. Further, we have designed and used a marker sticker method to allow for the easy rectification and alignment of acquired images during data processing. We show the results of our approach by images rendered for 36 measured material samples.

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“…Therefore, it is important to be able to scan the object and generate a 3D model with a realistic texture. Our 3D reconstruction method is based on the structured light principle used in [41]. In this method, correspondences between the acquisition devices are generated by projecting patterns on the object.…”

Section: D Scanningmentioning

confidence: 99%

6DoF Object Tracking based on 3D Scans for Augmented Reality Remote Live Support

et al. 2018

Self Cite

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Abstract:Tracking the 6DoF pose of arbitrary 3D objects is a fundamental topic in Augmented Reality (AR) research, having received a large amount of interest in the last decades. The necessity of accurate and computationally efficient object tracking is evident for a broad base of today's AR applications. In this work we present a fully comprehensive pipeline for 6DoF Object Tracking based on 3D scans of objects, covering object registration, initialization and frame to frame tracking, implemented to optimize the user experience and to perform well in all typical challenging conditions such as fast motion, occlusions and illumination changes. Furthermore, we present the deployment of our tracking system in a Remote Live Support AR application with 3D object-aware registration of annotations and remote execution for delay and performance optimization. Experimental results demonstrate the tracking quality, real-time capability and the advantages of remote execution for computationally less powerful mobile devices.

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A full-spherical device for simultaneous geometry and reflectance acquisition

Cited by 20 publications

References 20 publications

WebGL-based streaming and presentation of objects with bidirectional texture functions

WebGL-based streaming and presentation of objects with bidirectional texture functions

Lightdrum—Portable Light Stage for Accurate BTF Measurement on Site

6DoF Object Tracking based on 3D Scans for Augmented Reality Remote Live Support

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