Thèse de doctorat : Université de Neuchâtel, 2009 ; Th. 2120.
Cette thèse est une contribution au champ vaste et dynamique de la vision 3D. Le travail présenté s’intéresse au rôle joué par les algorithmes de traitement d’image dans des systèmes de vision 3D spécifiques ainsi que dans des applications novatrices. Deux systèmes d’imagerie 3D très différents sont considérés : un microscope 3D basé sur le principe depth from focus, et...
|
Thèse de doctorat : Université de Neuchâtel, 2009 ; Th. 2080.
To perceive the environment efficiently, the human vision system proceeds by selecting salient targets. The targets are explored successively by means of saccadic eye movements, which are responsible for shifting the fovea onto the current fixated target. Defined as selective attention, this mechanism can be seen as a preprocessing step, which reduces the amount of information that will be...
|
In: Human Vision and Electronic Imaging XII (Proceedings of SPIE), 2007, vol. 6492, no. 47, p. 649219- 649229
Visual attention models mimic the ability of a visual system, to detect potentially relevant parts of a scene. This process of attentional selection is a prerequisite for higher level tasks such as object recognition. Given the high relevance of temporal aspects in human visual attention, dynamic information as well as static information must be considered in computer models of visual attention....
|
In: Two- and Three-Dimensional Methods for Inspection and Metrology IV (Proceedings of SPIE), 2006, vol. 6382, no. 10, p. 638209- 638216
The paper provides considerations relative to the application of 3D vision methods and presents some lessons learnt in this respect by presenting four 3D vision tasks and discussing the selection of vision sensing devices meant to solving the task. After a short reminder of 3D vision methods of interest for optical range imaging for microvision and macrovision applications, the paper enumerates...
|
In: Two- and Three-Dimensional Vision Systems for Inspection, Control, and Metrology II (Proceedings of SPIE), 2006, vol. 5606, no. 9, p. 134-144
A large number of 3D cameras suffer from so-called holes in thedata, i.e. the measurement lattice is affected by invalidmeasurements and the range image has undefined values.Conventional image filters used for removing the holes perform notwell in presence of holes with large varying hole sizes. The novelhole-filling method presented in this paper operates onreliability attributed range images...
|
In: Two- and Three-Dimensional Vision Systems for Inspection, Control, and Metrology (Proceedings of SPIE), 2003, vol. 5265, no. 19, p. 134-144
The depth from focus measurement principle relies on the detection of the optimal focusing distance for measuring the depth map of an object and finding its 3D shape. The principle is most effective at microscopic ranges where it is usually found implemented around a z-controlled microscope and sometimes named multifocus 3D microscopy. Assuch, the method competes with many other 3D measurement...
|
In: Metrology-based Control for Micro-Manufacturing (Proceedings of SPIE), 2001, vol. 4275, no. 8, p. 61-70
There exist many techniques for the measurement of micro and nano surfaces and also several conventional ways to represent the resulting data, such as pseudo color or isometric 3D. This paper addresses the problem of building complete 3D micro-object models from measurements in the submicrometric range. More specifically, it considers measurements provided by an atomic-force microscope (AFM) and...
|
In: Machine Vision Applications in Industrial Inspection VIII (Proceedings of SPIE), 2000, vol. 3966, no. 11, p. 60-67
A specific configuration for liquid flow metrology consists of a flow of falling drops coupled with a preferred measuring method that derives the flow directly from the drop count. Given the inaccuracy of this counting method, alternative methods have been proposed that measure the volume of each falling drop. The principle consists in deriving the volume from geometric measurements obtained by...
|
In: Machine Vision Applications in Industrial Inspection VIII (Proceedings of SPIE), 2000, vol. 3966, p. 259-269
Nowadays, vision-based inspection systems are present in many stages of the industrial manufacturing process. Their versatility, which permits to accommodate a broad range of inspection requirements, is however limited by the time consuming system setup performed at each production change. This work aims at providing a configuration assistant that helps to speed up this system setup, considering...
|
In: Three-Dimensional Image Capture and Applications II (Proceedings of SPIE), 1999, vol. 3640, p. 38-48
This paper deals with the problem of capturing the color information of physical 3D objects thanks to a class of digitizers providing color and range data, like range finders based on structured lighting. It appears typically in a modeling procedure that aims at building a realistic virtual 3D model. The color data delivered by such scanners basically express the reflected color intensity of the...
|