8
Jan, 2010
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Student Projects 2008-2009

This article reports the projects developed by students in the area of the development and validation of 2D vision systems. The projects are carried out by undergraduated students, for their graduation (I level) or by graduated students, during the attendance of the courses of Optical Measurements and of Electronic Instrumentation B.

The following project has been developed by Thomas Plabani, in 2007-2008. 

The aim was to study a Pattern Matching software for a 2D vision system to be assembled on an automatic die cutter. Time and precision constraints were rather demanding. 
Download the presentation to have an insight of how the problem has been solved!

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The project below has been developed by Matteo Frassine and Stefano Pesce, during the course of Electronic instrumentation, year 2008-2009.

They had to detect the features of the plug in the figure: diameter of the plug and number of the small metallic spheres of the wire.

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This project has been developed by Daniele Mazzotti and Diego Rossini, during the course of Electronic instrumentation, year 2008-2009.

They had to detect the features of the clothes peg shown in the figure below. They had to count the pegs in the package, detect the absence of one or more pegs, detect misalignment of them, control the color sequence.

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The project below has been developed by Andrea Cadei and Manuel Zenato, during the course of Electronic instrumentation, year 2008-2009. 

They had to detect the features of the soapdish shown in the figure. The difficulty in this case was to perform the measurement of a transparent object. Suitable illumination and image processing have been used.

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This project has been developed by Aurel Fonta, during the course of Electronic instrumentation, year 2008-2009.

The objective was to measure the object geometry, to ‘read’ the brand label, and to read the bar code.

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The project below has been developed by Davide Alghisi and Alessio Zanni, during the course of Electronic instrumentation, year 2008-2009. 

They had to control the integrity of the comb shown below, to count the comb teeth and to measure its dimension.
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7
Jan, 2010
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Development of Laser Slits: Student Projects

The development of systems based on the projecttion of laser stripes is very interesting under the education point of view. Students must learn about active triangulation principles, imaging techniques, programming techniques, and metrology.

In addition, computer vision is required for the calibration of the camera projector pair. This article reports examples of this type of projects.

The first one is the development of a laser slit system for the measurement of the central profile of small buttons. The system has been completely developed in LabView.

The students are Emanuele Ferrari and Paolo Bellandi. In this presentation one can learn how they worked for the development of the demonstrator.

The demonstrator developed by the students for the project.
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The second project deals with the development of a system based on the projection of two laser stripes and the use of a single camera. The aim is to add redundancy to decrease the influence of shadow, which inherently decrease the performances of the measurement. 

Two Ph. D. students are being working at this project: Paolo Bellandi and Gianluca Cavagnini. The first results are available in the presentation.

The demonstrator developed so far by the Ph. D. students.
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5
Jan, 2010
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Student Projects 2006-2007

This is an example of the typical project in the course of Optical Measurements. 

The students have been involved into the acquisition of a small car by using the system based on the projection of structured light. The PolyWorks suite of programs was used to acquire the mesh.

The real difficulty in this project was the calibration of OPL-3D, since it requires the knowledge of calibration camera models and the experimental practice with calibration masters  and setup of the projector-camera pair.

The students are Marco Tomasini and Michele Mancini. Download the presentation to have an insight of the work.

The small car to be acquired and renderize by using OPL-3D.
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This project has been carried out at the city museum (Museo di Santa Giulia), where the students had to acquire the Winged Victory of Brescia statue using the Vivid 910 Scanner as the measurement sensor.

The statue was already measured in 2001 by using OPL-3D. The aim was to compare the measurement performances when coherent light (Vivid 910) is used instead of incoherent light (OPL-3D). 

The students who carried out the project are Nicola Modonesi and Davide Barba. Here you can download a brief presentation of their work.

The beautiful Winged Victory of Brescia statue to be acquired by the students.
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In this project the students had to acquire a bas-relief at the Museo di Santa Giulia of Brescia by using the Vivid 910 Scanner.

The bas-relief is a very large one, representing the patron saints of Brescia, St. Faustino and Giovita. The aim was to produce the triangle mesh of the bass-relief.

The students who carried out the project are Mauro Facchini and Emanuele Tonoli. Here you can download a brief presentation of their work.

The bas-relief of Saints Faustino and Giovita to be acquired by the students.
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5
Jan, 2010

3D image acquisition of crime scenes for documentation, analysis and medical inspection

In this thesis project the two students involved (Marco Scalvenzi and Gianluca Cavagnini) had the opportunity of using the Vivid 910 laser scanner to document 3D crime scenes at different resolution levels.

It was really interesting to capture medium range details, such as the injury tools and body parts, as well as short range details, like bullet holes, skin lesions, and blood patterns.

A numer of experiences have been performed both in indoor and in outdoor environments. The flexibility, the portability and the ease of use of this system revealed very precious to complete the projects.

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