Software Synchronization of Projector and Camera for Structured Light 3D Body Scanning

Petković, Tomislav; Pribanić, Tomislav; Đonlić, Matea; D'Apuzzo, Nicola

doi:10.15221/16.286

Cited by 9 publications

(11 citation statements)

References 22 publications

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“…With this configuration we are able to acquire data with 30 FPS on average. By employing a precise synchronization between cameras [32,33] we are able to obtain a 3D surface reconstruction of subject's front and back for each frame acquired during the scanning procedure.…”

Section: Proposed 3d Scannermentioning

confidence: 99%

3D sensing of back symmetry curve suited for dynamic analysis of spinal deformities

Đonlić

Petković

Peharec³

et al. 2018

Automatika

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This paper is focused on meeting the demands for better detection and evaluation of the spinal deformities that go beyond a basic static 3D analysis. It is expected that by observing the spine while it moves an improved 3D deformity analysis and measurements can be achieved. In this paper, we present a novel approach for the automatic back symmetry curve sensing. Our approach can be used in the back shape analysis of many different positions, i.e. segments of the dynamic motion, and is not limited only to the upright standing position. The proposed method is based on the 3D surface reconstruction, surface curvature analysis and graph theoretic approach for the (semi-)automatic detection of the symmetry curve. In addition, we introduce a 3D scanning system which was used in our experiment to successfully generate 3D back surface reconstructions for each frame of the captured forward bending motion. We also tested the proposed method on the data collected using commercial 3D spine analysis system and the results were comparable. The additional experiment focusing on the dynamic analysis demonstrated that the proposed method can enable further advances in the automatic 3D back surface analysis by tracking the spine position throughout performed movements.

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Section: Proposed 3d Scannermentioning

confidence: 99%

3D sensing of back symmetry curve suited for dynamic analysis of spinal deformities

Đonlić

Petković

Peharec³

et al. 2018

Automatika

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“…The synchronization may be implemented in hardware or in software. Hardware implementations use custom synchronization circuits [24,25] or standard video-genlocks [26,27] while software implementation relay on the precise timing of projection and acquisition [28].…”

Section: Software Synchronizationmentioning

confidence: 99%

“…We propose to use software only synchronization which is based on our previous work [28] where a VBLANK interrupt is used as a master timing signal to synchronize one or more cameras to a single projector. One challenge when extending our software-base synchronization [28] to multiple projectors is that each projector will have its own VBLANK interrupt.…”

Section: Software Synchronizationmentioning

confidence: 99%

“…One challenge when extending our software-base synchronization [28] to multiple projectors is that each projector will have its own VBLANK interrupt. In other words on consumer grade video graphics cards VBLANK interrupt for each output occurs at different time as video output ports are not synchronized; exceptions are synchronized display solutions intended for large-scale video walls such as NVidia's Quadro Sync [29].…”

Section: Software Synchronizationmentioning

confidence: 99%

“…In other words on consumer grade video graphics cards VBLANK interrupt for each output occurs at different time as video output ports are not synchronized; exceptions are synchronized display solutions intended for large-scale video walls such as NVidia's Quadro Sync [29]. To synchronize projectors in software, additional overhead delays will be included into the scheme of [28] to achieve the following: (1) new frames may be presented by each projector only after all cameras have completed acquisition, and (2) no camera may be triggered before the delay time of the slowest projector has expired. A timing diagram showing the proposed software synchronization scheme for a simple two-projectors two-cameras scanner is shown in Fig.…”

Section: Software Synchronizationmentioning

confidence: 99%

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Multi-Projector Multi-Camera Structured Light 3D Body Scanner

Petković¹,

Pribanić²,

Đonlić³

et al. 2017

Proceedings of 3DBODY.TECH 2017 - 8th International Conference and Exhibition On 3D Body Scanning and Processing Technologies,

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Human body scanners using structured light are usually comprised of one projector which provides a limited view of the body surface due to limited field-of-view. To scan the whole surface of a human body multiple projectors must be used. Using more than one projector in a structured light scanner is typically difficult due to inter-projector interferences which make surface reconstruction a hard task. We propose to use temporal phase-shifts to enable multiplexing in fringe-projection profilometry. In our approach each projector projects a sinusoidal fringe pattern having its own specifically chosen set of temporal phase shifts so for a system of projectors all temporal phase shifts together comprise a DFT basis. Such choice of temporal phase shifts enables simple and efficient separation of the combined pattern into the contributions of each projector. The proposed approach places no constraints on the number of projectors and on spatial projector placement. We demonstrate the applicability of the proposed approach on a prototype human body scanner using three projectors and six cameras.

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