Jean-Nicolas Ouellet

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We present a new geometric calibration method for a structured light system combining a projector with a camera , using a planar target with circular control points. By solely exploiting the mapping between projected conics, the proposed method is strictly geometric and provides unbi-ased camera to projector correspondences during its application. Such a(More)
This paper presents a simple linear operator that accurately estimates the parameters of ellipse features. Based on the dual conic model, the operator directly exploits the raw gradient information in the neighborhood of an ellipse's boundary, thus avoiding the intermediate stage of precisely extracting individual edge points. Moreover, under the dual(More)
This paper presents a simple linear operator that accurately estimates the position and parameters of ellipse features. Based on the dual conic model, the operator avoids the intermediate stage of precisely extracting individual edge points by exploiting directly the raw gradient information in the neighborhood of an ellipse's boundary. Moreover, under the(More)
We describe an accurate keypoint detector that is stable under viewpoint change. In this paper, keypoints correspond to actual junctions in the image. The principle of ASN differs fundamentally from other keypoint detectors. At each position in the image and before any detection, it systematically estimates the position of a potential junction from the(More)
This paper proposes two indicators for predicting the quality of camera model parameters from a set of input images. The first indicator is based on the acutance. It can quickly indicate static or motion blur during image capture and correlates well with the 3D reconstruction error when using stereo cameras. The second indicator provides the overall(More)
Video summarization is the process in which we extract key frames to form a storyboard representing the content of a video sequence. When asked to select images representing a video sequence, users attempt to find images related to the subject of the video. For the computer, such semantic analysis is a very hard problem. Still, it is possible to objectively(More)
3D interactive modeling from range data aims at simultaneously producing and visualizing the surface model of an object while data is collected. The current research challenge is producing the final result in real-time. Using a recently proposed framework, a surface model is built in a volumetric structure encoding a vector field in the neighborhood of the(More)
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