An architecture for immersive evaluation of complex human tasks

Molet, Tom; Boulic, Ronan; Rezzonico, Serge; Thalmann, Daniel

doi:10.1109/70.768180

Cited by 14 publications

(9 citation statements)

References 13 publications

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“…It has been exploited in a real-time full-body tennis game demonstrated at the international exhibition Telecom Interactive'97 in Geneva [M*99]. Its major drawback was however the heavy calibration effort to obtain homogeneous position measurement over the capture area [MBRT99]. A true improvement came with the advent of active optical motion capture systems that could automatically recognize the markers even after some periods of occlusion (e.g.…”

Section: Background In Full Body 3d Interactionsmentioning

confidence: 99%

“…In the nineties a seducing alternative to vision-based techniques was to exploit magnetic sensors as they are not subject to occlusion [A96]. Molet et al [MBRT99] proposed an analytic IK algorithm exploiting one 3D orientation measurement per body segment and one 3D position measurement for the whole body. It has been exploited in a real-time full-body tennis game demonstrated at the international exhibition Telecom Interactive'97 in Geneva [M*99].…”

Section: Background In Full Body 3d Interactionsmentioning

confidence: 99%

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Integrated Analytic and Linearized Inverse Kinematics for Precise Full Body Interactions

Boulic

Raunhardt

2009

Motion in Games

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Abstract.Despite the large success of games grounded on movement-based interactions the current state of full body motion capture technologies still prevents the exploitation of precise interactions with complex environments. This paper focuses on ensuring a precise spatial correspondence between the user and the avatar. We build upon our past effort in human postural control with a Prioritized Inverse Kinematics framework. One of its key advantage is to ease the dynamic combination of postural and collision avoidance constraints. However its reliance on a linearized approximation of the problem makes it vulnerable to the well-known full extension singularity of the limbs. In such context the tracking performance is reduced and/or less believable intermediate postural solutions are produced. We address this issue by introducing a new type of analytic constraint that smoothly integrates within the prioritized Inverse Kinematics framework. The paper first recalls the background of full body 3D interactions and the advantages and drawbacks of the linearized IK solution. Then the FlexionEXTension constraint (FLEXT in short) is introduced for the partial position control of limb-like articulated structures. Comparative results illustrate the interest of this new type of integrated analytical and linearized IK control.

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Section: Background In Full Body 3d Interactionsmentioning

confidence: 99%

Section: Background In Full Body 3d Interactionsmentioning

confidence: 99%

Integrated Analytic and Linearized Inverse Kinematics for Precise Full Body Interactions

Boulic

Raunhardt

2009

Motion in Games

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“…floor in Shin et al (2001)). In the field of Virtual Reality, a few full-body avatar control attempts have been relying on the magnetic tracking technology (Badler et al, 1993;Molet et al, 1999). The execution of immersive 3D tasks such as reaching, grasping and manipulation have otherwise mostly been relying on isolated virtual tools driven by the locations of the user's hands (Mine et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

On scaling strategies for the full-body postural control of virtual mannequins

Boulic¹,

Maupu²,

Thalmann³

2009

Interacting with Computers

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a b s t r a c tDue to its intrinsic complexity, full-body postural input has been mostly limited to off-line motion capture and to on-line puppetry of a virtual character with little interaction with its environment (e.g. floor). The motion capture technology is now mature enough to envision the on-line full-body postural control of virtual mannequins involved in precise reaching tasks. We have investigated such tasks for mannequins of differing body heights in comparison to that of the system user. Such broad-range avatar control is relevant for virtual prototyping in various industrial sectors as a single person is responsible for evaluating a virtual prototype for a full range of potential end-users. In the present paper we report on two scaling strategies that can be enforced in such a context of height-differing avatar control. Both scaling strategies have been evaluated in a wide-range reach study both in front of a stationary immersive display and with an HMD. A comparison is also made with a baseline scenario, which exploits a simple rigid shape (i.e. a proxy), to assess the specific influence of controlling a complex articulated avatar.

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“…However, the uncontrolled degrees of freedom, like the swivel angle of the arms, can lead over time to important differences between the end user and the virtual human model. Molet has described an approach suppressing this ambiguity by using more sensors [3]. Other approaches, identifying in addition the skeleton structure and segment lengths, were proposed by Bodenheimer [4] and O'Brien [5].…”

Section: Introductionmentioning

confidence: 99%