Université de Neuchâtel

3D modeling from AFM measurements

Jost, Timothée ; Hügli, Heinz

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...

Université de Neuchâtel

Color digitizing and modeling of free-form 3D Objects

Jost, Timothée ; Schütz, Christian L. ; Hügli, Heinz

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...

Université de Neuchâtel

Digitalisation et modélisation d'objets 3D colorés = Color digitazing and modeling of free-form 3D objects

Hügli, Heinz ; Jost, Timothée

In: Congrès sur la numérisation 3D, design et digitalisation, création industrielle et artistique, 2000, p. 1-12

This presentation addresses the color capturing of a free-form 3D object measured with a range scanner. This problem appears typically in a modeling procedure that aims to build a realistic colored 3D model. Its two main aspects are considered in sequence. The first aspect is the requirement of a good registration of color and geometry. This part of the problem is best solved at the source by...

Université de Neuchâtel

Cue Normalisation Schemes in Saliency-based Visual Attention Models

Ouerhani, Nabil ; Jost, Timothée ; Bur, Alexandre ; Hügli, Heinz

In: Proceeding. Second International Cognitive Vision Workshop (ICVW), 2006, p. 1-7

Université de Neuchâtel

Contribution of depth to visual attention: comparison of a computer model and human

Jost, Timothée ; Ouerhani, Nabil ; von Wartburg, Roman ; Müri, René ; Hügli, Heinz

In: Proceedings. Early cognitive vision workshop, 2004, p. 1-4

The research described in this paper aims at assessing the contribution of depth to visual attention. It reports the measurement of depth induced human visual attention derived from fixation patterns and preliminary results of a quantitative comparison with visual attention as modeled by different versions of a computational model. More specifically, a two-cues color model is compared to a...

Université de Neuchâtel

Fast ICP algorithms for the registration of 3D data

Jost, Timothée ; Hügli, Heinz

In: Proceedings. 3D modeling, 2003, p. 1-9

The iterative closest point (ICP) algorithm is widely used for the registration of geometric data and it applies to a wide field of activities that range from 3D object modeling to object recognition. One of the its main drawbacks is its quadratic time complexity O(N2) with the shape size N, which implies heavy computations. Consequently, there is a need to speed up the ICP algorithm and several...

Université de Neuchâtel

Fast ICP algorithms for shape registration

Jost, Timothée ; Hügli, Heinz

In: Pattern Recognition (In: Lecture Notes in Computer Science), 2002, vol. 2449, p. 91-99

Shape registration plays an important role in applications such as 3D object modeling or object recognition. The iterative closest point (ICP) algorithm is widely used for the registration of geometric data. One of its main drawback is its time complexity O(N2), quadratic with the shape size N, which implies long processing time, especially when using high resolution data. Several...

Université de Neuchâtel

Model Performance for Visual Attention in Real 3D Color Scenes

Hügli, Heinz ; Jost, Timothée ; Ouerhani, Nabil

In: Artificial Intelligence and Knowledge Engineering Applications: A Bioinspired Approach. Series: Lecture Notes in Computer Science, 2006, vol. 3562, p. 469-478

Visual attention is the ability of a vision system, be it biological or artificial, to rapidly detect potentially relevant parts of a visual scene. The saliency-based model of visual attention is widely used to simulate this visual mechanism on computers. Though biologically inspired, this model has been only partially assessed in comparison with human behavior. The research described in this...

Université de Neuchâtel

Semi-automatic 3D object digitizing system using range images

Schütz, Christian ; Jost, Timothée ; Hügli, Heinz

In: Computer Vision - ACCV'98 (Asian Conference on Computer Vision), 1998, vol. 1351, p. 490-497

Manual object digitizing is a tedious task and can be replaced by 3D scanners which provide an accurate and fast way to digitize solid objects. Since only one view of an object can be captured at once, several views have to be combined in order to obtain a description of the complete surface. In this paper a digitizing system is proposed which captures and triangulates views of a real world 3D...

Université de Neuchâtel

Free-form 3D object reconstruction from range images

Schütz, Christian ; Jost, Timothée ; Hügli, Heinz

In: Proceedings. International Conference on Virtual Systems and MultiMedia (VSMM '97), 1997, p. 69-80

The increasing use of virtual object representations for several applications creates a need for fast and simple object digitizing systems. Range finders provide a convenient way to digitize solid objects and permit the accurate and fast scanning of an object shape without any probe contact. However, only one view of an object can be captured at once, and therefore, for most objects, several...