Online Calibration of a 4 DOF Stereo Head

Thacker, N. A.; Courtney, P.

doi:10.5244/c.6.55

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…The calibration is performed once during setup and is not required in subsequent interaction with the display. Future improvements might harness solutions for the online tracking of calibration parameters [4,24] to enable movement of the screen relative to the stereo camera pair. The fixed hardware configuration of our project did not raise this requirement.…”

Section: Resultsmentioning

confidence: 99%

Virtual Volumetric Graphics on Commodity Displays Using 3D Viewer Tracking

Malleson

Collomosse

2012

Int J Comput Vis

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Three dimensional (3D) displays typically rely on stereo disparity, requiring specialized hardware to be worn or embedded in the display. We present a novel 3D graphics display system for volumetric scene visualization using only standard 2D display hardware and a pair of calibrated web cameras. Our computer vision-based system requires no worn or other special hardware. Rather than producing the depth illusion through disparity, we deliver a full volumetric 3D visualization -enabling users to interactively explore 3D scenes by varying their viewing position and angle according to the tracked 3D position of their face and eyes. We incorporate a novel wand-based calibration that allows the cameras to be placed at arbitrary positions and orientations relative to the display. The resulting system operates at real-time speeds (∼ 25 fps) with low latency (120 − 225 ms) delivering a compelling natural user interface and immersive experience for 3D viewing. In addition to objective evaluation of display stability and responsiveness, we report on user trials comparing users' timings on a spatial orientation task.

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Section: Resultsmentioning

confidence: 99%

Virtual Volumetric Graphics on Commodity Displays Using 3D Viewer Tracking

Malleson

Collomosse

2012

Int J Comput Vis

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“…It is able to track an existing calibration integrating statistical information from known epi-polar errors, robot motion and calibration targets [17]. It was also extended to support calibration of a 4DOF stereo head system [16].…”

Section: Camera Calibrationmentioning

confidence: 99%

TINA 2001: The Closed Loop 3D Model Matcher

Lacey¹,

Thacker

Courtney³

et al. 2001

Procedings of the British Machine Vision Conference 2001

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This paper discusses advances made to the 3D geometrical model matching system within the TINA machine vision environment over the last 10 years including the recent inclusion of a verification stage. We show how this final step closes the loop on the object location system allowing the theoretical location performance to be attained, eliminating key assumptions used in the existing forward pass algorithms. We explain how the use of a system approach has been crucial to the development of key components and summarise our findings.

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Motion of points and lines in the uncalibrated case

Viéville

Faugeras

Luong

1996

Int J Comput Vision

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In the present paper we address the problem of computing structure and motion, given a set point and/or line correspondences, in a monocular image sequence, when the camera is not calibrated.Considering point correspondences first, we analyse how to parameterize the retinal correspondences, in function of the chosen geometry: Euclidean, affine or projective geometry. The simplest of these parameterizations is called the FQs-representation and is a composite projective representation. The main result is that considering N + 1 views in such a monocular image sequence, the retinal correspondences are parameterized by 11 N -4 parameters in the general projective case. Moreover, 3 other parameters are required to work in the affine case and 5 additional parameters in the Euclidean case. These 8 parameters are "calibration" parameters and must be calculated considering at least 8 external informations or constraints. The method being constructive, all these representations are made explicit.Then, considering line correspondences, we show how the the same parameterizations can be used when we analyse the motion of lines, in the uncalibrated case. The case of three views is extensively studied and a geometrical interpretation is proposed, introducing the notion of trifocal geometry which generalizes the well known epipolar geometry. It is also discussed how to introduce line correspondences, in a framework based on point correspondences, using the same equations.Finally, considering the FQs-representation, one implementation is proposed as a "motion module", taking retinal correspondences as input, and providing and estimation of the 11 N -4 retinal motion parameters. As discussed in this paper, this module can also estimate the 3D depth of the points up to an affine and projective transformation, defined by the 8 parameters identified in the first section. Experimental results are provided.

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Online Calibration of a 4 DOF Stereo Head

Cited by 4 publications

References 6 publications

Virtual Volumetric Graphics on Commodity Displays Using 3D Viewer Tracking

Virtual Volumetric Graphics on Commodity Displays Using 3D Viewer Tracking

TINA 2001: The Closed Loop 3D Model Matcher

Motion of points and lines in the uncalibrated case

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