Structured light self-calibration with vanishing points

Orghidan, Radu; Salví, Joaquím; Gordan, Mihaela; Florea, Camelia; Batlle, Joan

doi:10.1007/s00138-013-0517-x

Cited by 27 publications

(14 citation statements)

References 27 publications

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“…The solution of the unknowns (dz j , dz i , dx j and dx i ) is depicted in Equation (4), which is known as the normal equations. Finally, the X and Z compensated coordinates of CPs are calculated as shown in (5) and (6). Note that the Y coordinates are not compensated in this procedure, as the height h is directly measured on the screen surface, and thus is acquired with more accuracy.…”

Section: Control Pointmentioning

confidence: 99%

“…Many works on projector or multi-projector displays are based on planar surfaces [2][3][4][5][6][7][8], for which automated geometric correction and alignment is simplified through the use of planar homographies between the planar screen, the projector frame buffers, and the images of one or more cameras observing the screen. Many of these developments use chessboards-based planar references alone or with a combination of other planar surfaces to automatically measure 2D points (i.e., image points) and establish point correspondences [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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A Multi-Projector Calibration Method for Virtual Reality Simulators with Analytically Defined Screens

et al. 2017

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Abstract:The geometric calibration of projectors is a demanding task, particularly for the industry of virtual reality simulators. Different methods have been developed during the last decades to retrieve the intrinsic and extrinsic parameters of projectors, most of them being based on planar homographies and some requiring an extended calibration process. The aim of our research work is to design a fast and user-friendly method to provide multi-projector calibration on analytically defined screens, where a sample is shown for a virtual reality Formula 1 simulator that has a cylindrical screen. The proposed method results from the combination of surveying, photogrammetry and image processing approaches, and has been designed by considering the spatial restrictions of virtual reality simulators. The method has been validated from a mathematical point of view, and the complete system-which is currently installed in a shopping mall in Spain-has been tested by different users.

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Section: Control Pointmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Multi-Projector Calibration Method for Virtual Reality Simulators with Analytically Defined Screens

et al. 2017

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“…Nowadays, several methods exist in 3D modelling: i) image based methods that exploit photogrammetric aspects in creating high fidelity 3D maps (Remondino and Zhang, 2006;Hullo et al, 2009;Haala and Rothermel, 2012), ii) photometric stereo that exploits light reflection properties for 3D modelling (Argyriou et al, 2014), iii) real-time depth sensors, such as Kinect, to create cost-effective but of low fidelity RGBD images (Izadi, 2011), iv) structured light technologies with the capability of simultaneously capture 3D geometry and texture (Soile et al, 2013;Orghidan, 2014) and v) laser scanning for large scale automated 3D reconstruction (Valanis et al, 2009;Hai, 2013). However, each of the aforementioned methods present advantages/disadvantages making high fidelity 3D modelling of CH assets a complex decision making process.…”

Section: Previous Workmentioning

confidence: 99%

5D Modelling: An Efficient Approach for Creating Spatiotemporal Predictive 3D Maps of Large-Scale Cultural Resources

Doulamis

Ioannidis

et al. 2015

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Outdoor large-scale cultural sites are mostly sensitive to environmental, natural and human made factors, implying an imminent need for a spatio-temporal assessment to identify regions of potential cultural interest (material degradation, structuring, conservation). On the other hand, in Cultural Heritage research quite different actors are involved (archaeologists, curators, conservators, simple users) each of diverse needs. All these statements advocate that a 5D modelling (3D geometry plus time plus levels of details) is ideally required for preservation and assessment of outdoor large scale cultural sites, which is currently implemented as a simple aggregation of 3D digital models at different time and levels of details. The main bottleneck of such an approach is its complexity, making 5D modelling impossible to be validated in real life conditions. In this paper, a cost effective and affordable framework for 5D modelling is proposed based on a spatial-temporal dependent aggregation of 3D digital models, by incorporating a predictive assessment procedure to indicate which regions (surfaces) of an object should be reconstructed at higher levels of details at next time instances and which at lower ones. In this way, dynamic change history maps are created, indicating spatial probabilities of regions needed further 3D modelling at forthcoming instances. Using these maps, predictive assessment can be made, that is, to localize surfaces within the objects where a high accuracy reconstruction process needs to be activated at the forthcoming time instances. The proposed 5D Digital Cultural Heritage Model (5D-DCHM) is implemented using open interoperable standards based on the CityGML framework, which also allows the description of additional semantic metadata information. Visualization aspects are also supported to allow easy manipulation, interaction and representation of the 5D-DCHM geometry and the respective semantic information. The open source 3DCityDB incorporating a PostgreSQL geo-database is used to manage and manipulate 3D data and their semantics.

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“…The extrinsic parameters are related to the geometric structure of the FPP, e.g., the locations of the camera and the projector with respect to the object to be measured, and the intrinsic parameters are from the camera and projector structure. These parameters can be determined through camera calibration (CC) [6][7][8][9][10][11][12] and projector calibration (PC) [13][14][15][16][17][18][19][20][21][22]. When a camera is calibrated, the corresponding relationship can be established between the three-dimensional (3D) shape of an object and the corresponding two-dimensional (2D) image taken by the camera (referred to as the camera image).…”

Section: Introductionmentioning

confidence: 99%

“…1. The projector can be calibrated using two different approaches [13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Accurate projector calibration based on a new point-to-point mapping relationship between the camera and projector images

Huang

et al. 2015

Appl. Opt.

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The mapping relationship between the charge-coupled device (CCD) of a camera and the digital micro-mirror device (DMD) of a projector, together with the algorithm to estimate the parameters of the projector, determines the accuracy of projector calibration. In this paper, a new method is presented to achieve sub-pixel-level mapping between the camera and projector images. Instead of directly mapping the circle centers from the CCD to the DMD, which is pixel-precision-based, a set of pixels on the circle edge are extracted on the CCD and mapped onto the DMD. The locations of the circle centers are extracted on the DMD by the least-squares fitting technique, thus achieving sub-pixel precision. Compared with existing approaches based on the direct mapping of the circle centers on the camera image to the projector image, the proposed method is characterized by higher accuracy in mapping the points and thus the projector calibration. The experimental results are presented to show the effectiveness of the proposed method in the improvement of the accuracy of the projector calibration.

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Structured light self-calibration with vanishing points

Cited by 27 publications

References 27 publications

A Multi-Projector Calibration Method for Virtual Reality Simulators with Analytically Defined Screens

A Multi-Projector Calibration Method for Virtual Reality Simulators with Analytically Defined Screens

5D Modelling: An Efficient Approach for Creating Spatiotemporal Predictive 3D Maps of Large-Scale Cultural Resources

Accurate projector calibration based on a new point-to-point mapping relationship between the camera and projector images

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