Stereo correspondence is one of the most active research areas in computer vision. It consists in identifying features in two or more stereo images that are generated by the same physical feature in the three-dimensional space. In our approach, the matching problem is first turned into an optimization task where a fitness function, representing the constraints on the solution, is to be minimize...

VIDET is a research project active at the University of Bologna and aimed at the development of a mobility aid for the visually impaired. VIDET’s approach consists in the conversion of depth data gathered through a stereo-vision system into a 3D model perceivable by the user by means of a wire-actuated haptic interface. In this paper we describe VIDET’s real-time stereo-vision system, implement...

Accurate dynamic measurement of the 3-D shape of moving objects is a rapidly expanding field, with applications in entertainment, design, and manufacturing. In this work, the two CCD/CMOS cameras are calibrated with a flexible and accurate camera calibration method. Then, a new approach based on color-coded fringe is proposed for high precision 3D dynamic measurement. The method is based on pha...

This work presents a number of cases in Computer Vision where the introduction of the Kronecker product allows more elegant and compact derivations. We hold that a clear notation can enlighten properties and catalyze reasoning. In particular we introduce the trifocal matrix that allows to express the trilinear constraints among three views by using the familiar matrix algebra.

An important component of the drive towards intelligent vehicles is the ability to maintain a xed distance from a lead vehicle using feedback provided by range sensors. We are investigating the possibility of using stereo vision to provide the range information, in conjunction with a scanning laser radar sensor. The vision algorithms build on xation and reconstruction algorithms designed for ac...

Computer vision research rarely makes use of symmetry in stereo reconstruction despite its established importance in perceptual psychology. Such stereo reconstructions produce visually satisfying figures with precisely located points and lines, even when input images have low or moderate resolution. However, because few invariants exist, there are no known general approaches to solving symmetry...