Direct image alignment of projector-camera systems with planar surfaces

Audet, Samuel; Okutomi, Masatoshi; Tanaka, Masayuki

doi:10.1109/cvpr.2010.5540199

Cited by 23 publications

(19 citation statements)

References 18 publications

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“…In order to improve the visual analysis, the additional information about the object's geometry is superimposed directly on the artifact by using a videoprojector (item 4). A simple camera (item 5) is used in a preprocess for the calibration [Audet et al 2010] and to locate the object and the camera with respect to the projector. This is done by calculating the projection matrices for the videoprojector and the camera from their respective intrinsic parameters.…”

Section: The Setupmentioning

confidence: 99%

The Revealing Flashlight

Ridel

Reuter

Laviole

et al. 2014

J. Comput. Cult. Herit.

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Cultural heritage artifacts often contain details that are difficult to distinguish due to aging effects such as erosion. We propose the revealing flashlight, a new interaction and visualization technique in spatial augmented reality that helps to reveal the detail of such artifacts. We locally and interactively augment a physical artifact by projecting an expressive 3D visualization that highlights its features, based on an analysis of its previously acquired geometry at multiple scales. Our novel interaction technique simulates and improves the behavior of a flashlight: according to 6-degree-of-freedom input, we adjust the numerous parameters involved in the expressive visualization -in addition to specifying the location to be augmented. This makes advanced 3D analysis accessible to the greater public with an everyday gesture, by naturally combining the inspection of the real object and the virtual object in a co-located interaction and visualization space.The revealing flashlight can be used by archeologists, for example, to help decipher inscriptions in eroded stones, or by museums to let visitors interactively discover the geometric details and meta-information of cultural artifacts. We confirm its effectiveness, ease-of-use and ease-of-learning in an initial preliminary user study and by the feedbacks of two public exhibitions. . The Revealing Flashlight: Interactive spatial augmented reality for detail exploration of cultural heritage artifacts.

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Section: The Setupmentioning

confidence: 99%

The Revealing Flashlight

Ridel

Reuter

Laviole

et al. 2014

J. Comput. Cult. Herit.

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“…Successful applications include the removal of shadows cast by the speaker during a presentation, by means of multiple projectors [6], combining multiple projectors to create large display walls [7], projection defocus analysis and correction [8,9], manipulating one object's colour and texture to make it look like another [10], and real-time correction of the geometry of the projected image according to the underlying geometry of the projection surface [11]. Audet [2,3] recently proposed an alignment strategy for SAR based on 4-point parametrisation, suggested by Baker et al [12], template matching and Gauss-Newton optimisation of the homography parameters. A calibration procedure was employed to model the intrinsics of the projector and camera, colour mixing matrix and colour offset.…”

Section: Related Workmentioning

confidence: 99%

“…This naturally results in two approaches: (1) treating the projector as interference or (2) modelling the projected image. The latter approach requires a-priori information about the reflectance properties of the surface and ambient illumination, which is obtained by means of some calibration procedure, as demonstrated by Audet et al [2,3]. Here, tracking was done by template matching, which assumes some continuous motion between frames or an educated guess on the motion parameters.…”

Section: Introductionmentioning

confidence: 99%

Colour Descriptors for Tracking in Spatial Augmented Reality

Kooi

Sorbier

Saitō

2013

Computer Vision - ACCV 2012 Workshops

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Abstract.Augmented Reality is an emerging research field, that aims for the composition of real and virtual imagery, by means of a camera and display device. Spatial augmented reality employs data projectors to augment the real world. In this setting, traditional tracking methods fall short due to the interference caused by the projector. Recent works assume a calibration process to model the projector and assume continuity in movement of the object being tracked. In this paper we present a tracking-by-detection system that does not require such a procedure and makes use of natural features represented by SIFT descriptors. We evaluate a set of photometric invariants that have previously been shown to improve the performance of object recognition, added to the descriptor to reduce the influence of the projector. We evaluate the descriptors based on precision-recall under projector distortion and the total system based on its tracking performance. Results show tracking is significantly more precise using one of the invariants.

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“…Afin d'améliorer l'analyse visuelle de l'objet réel, des informations supplémentaires issues de l'analyse géométrique de l'objet sont projetées grâceà un vidéo-projecteur (item 4). La calibration du vidéo-projecteur avec l'objet réel est effectuée au préalable, en utilisant une simple caméra (item 5) [2].…”

Section: Le Matériel Utiliséunclassified

La Lampe torche magique

Ridel

Reuter

Laviole

et al. 2013

Proceedings of the 25th Conference on l'Interaction Homme-Machine

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La Réalité Augmentée Spatiale (RAS) permet d'enrichir des objets du monde réel par apposition d'informations numériquesà l'aide de vidéo-projecteurs. Elle présente un fort potentiel pour introduire de nouvelles techniques d'interaction, car la co-localisation de l'espace de rendu et de l'espace d'interaction dans le monde réel permet de se baser sur nos habitudes spontanées, comme l'interaction directe avec les mains. Nous proposons la Lampe torche magique, une nouvelle interactionà six degrés de libertés destinéeà améliorer l'analyse visuelle d'un objet réel grâceà l'apposition sélective d'informations numériques par le biais de la RAS. Cette interaction fait référenceà une triple métaphore de lampe torche : la zoneà inspecter déterminée par le spot lumineux, l'angle d'inspection caractérisé par la direction de la lampe torche, et l'intensité de la visualisation déterminée par la distance entre la lampe torche et l'objet "éclairé". Grâceà une numérisation 3D préalable de l'objet et une analyse géométrique multi-échelle de sa surface, nous augmentons l'objet réel avec une visualisation expressive qui met enévidence les détails de l'objet, tels que les courbures,à différenteséchelles et selon différents angles. Une premièreétude utilisateur exploratoire montre que sur une stèleégyptienne comportant une inscription peu visibleà l'oeil nu, notre technique permet d'améliorer la lisibilité sans perdre le lien entre l'objet réel et les informations abstraites.

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Direct image alignment of projector-camera systems with planar surfaces

Cited by 23 publications

References 18 publications

The Revealing Flashlight

The Revealing Flashlight

Colour Descriptors for Tracking in Spatial Augmented Reality

La Lampe torche magique

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