26
Jun, 2019

Student Projects 2018/2019

The projects presented by the students to complete the exam are described here. Every group was composed of two members, randomly selected.

Group 1: Extrinsic calibration of 2 Kinects using both a sphere-based calibration and a skeletonization-based calibration

The group task was to compare the extrinsic calibration results obtained both from a calibration made using a green sphere and a custom algorithm developed by University of Trento, and a calibration obtained by a skeletonization algorithm developed by our group.

Group 2: Intrinsic calibration evaluation

The group task was to empirically determine the best way to perform an intrinsic calibration of Kinect v2 cameras using a chessboard target (i. e. how many acquisitions? Distances? Inclinations?). Then, they calibrated four different Kinect v2 and analyzed the results of the calibration for each camera.

Group 3: Evaluation of a trabecular structure point cloud acquisition (1)

The group task was to compare two different acquisitions of a small trabecular structure 3D printed in Titanium, obtained (i) from the 3D digitizer Vivid-910 and (ii) from the 2D/3D Profile Sensor Wenglor MLWL132.

Group 4: People tracking system evaluation

The group task was to create a simple people tracking algorithm based on the 3D point cloud acquired from a Real Sense D435 camera mounted on the ceiling. The evaluation of the performances focused on how well the developed algorithm was able to track the path of the person compared to the theorethical path.

Group 5: Extrinsic calibration of 3 Kinects using a skeletonization algorithm

The group task was to analyze the result of the point cloud alignment obtained by the extrinsic calibrations performed. The group tested different configurations with 2 and 3 Kinects in different positions, used the skeletonization algorithm to obtained the rototranslation matrixes and finally analyzed the resulting alignments in PolyWorks.

Group 6: Evaluation of a trabecular structure point cloud acquisition (2)

The group task was to compare two different acquisitions of a small trabecular structure 3D printed in Titanium, obtained (i) from the 3D digitizer Vivid-910 and (ii) from the 2D/3D Profile Sensor Wenglor MLWL132. The trabecular structure used is different from the one used by Group 3.

Group 7: Instrumented crutches for gait analysis results evaluation

The group task was to perform some acquisitions of a person walking with a pair of our instrumented crutches in different outdoor set ups (uphill, downhill, planar). The acquisitions have been elaborated by our software to analyze gait phases, and their task was to choose the best set up conditions and filtering options according to the results of the algorithm.

27
Aug, 2015

Student Projects 2014-2015

The article presents a list of projects developed for the course of 2D Vision Systems during the year 2014-2015.

The first project was developed by Simone Formichella, with the aim of developing a small vision system to detect objects on a rotating table using a NI1764 smart camera.

One of the problems the student faced was how to detect reflective objects with optical sensors and how to deal with the transparency of the rotating plate. Moreover, the smart camera was able to perform only lightweight elaborations, so the system had to be splitted between camera and the host PC, which was able to perform the more computational heavy processing required. The whole system was developed using LabView.

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The second project was developed by Alessandro Nastro, with the aim of using a very low cost projector to project fringes for 3D reconstruction. 

The student created a triangulation system with two Basler Scout scA1390 cameras and a low cost projector (Philips PicoPix PPX22505). The student dealt with the camera 2D calibration performed by a custom made VI developed in LabView in order to correctly detect the fringes projected on the image and retrieve the period between them. In this way it is possibile to perform a 3D reconstruction of an object!

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The third project was developed by Pietro Craighero with the aim of measuring the inner and the outer radius of a mechanical object using telecentric lenses.

Telecentric lenses allow users to obtain images with high contrast with almost no image distorsion, thus being a fundamental piece of any high accuracy vision system. The student created a small set-up with a red-light laser and a telecentric camera, used to acquire 2D images of the object to be measured. The software used for the project was developed in LabView.

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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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14
Dec, 2009
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Photogrammetry: experiences carried out in the Laboratory from 2004 to 2007

From 2004 to 2007 a number of students have done projects and hands-on practice in the Laboratory with photogrammetry. The main goal was to understand pros and cons with respect to active vision: as such, 2D and 3D vision has been studied and used to perform measurments and to reconstruct real world scenes using industrial hardware.

A brief presentation of the activities carried out in the Laboratory during these years can be downloaded below.

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