1. Using the HDS3000 sensor for 3D acquisition and modeling of large scenes.
Thesis work, year 2005
Student: Davide Rossi,
Tutor: Giovanna Sansoni
Laboratory of Optoelectronics, University of Brescia
Brescia, Italy

2. To model large scenes by using a Time of Flight based system
Objective
To model large scenes by using a Time of Flight based system
The system: HDS3000
The software: Reconstructor
The student: Davide Rossi
The field of application: crime scene documentation
To freeze the scene
To share the scene
To measure the scene
At different resolutions
On an objective, quantitative basis

3. Acquisition of large scenes

4. Target and prisms
The real problem is to guaranete the correct alignment of the views.
External targets, internal targets and prisms were used
Their position was measured by a total station

5. The acquisition step (1)
2 mm (resolution) and 2 m (range)
View acquisition by using the HDS3000 device
Position N. 1 of the scanner

6. The acquisition step (2)
Position N. 2 of the scanner
2 cm (resolution) and 15 m (range)

7. The acquisition step (3)
Positions 3 and 4
Position 4
Position 3 3
2 mm over 2 m

8. Alignment

9. Applications (1) Angle edges and distances extraction
Exporting of edges in CAD environments

10. Applications (2)

11. Applications (3)

12. Applications (4)

13. Conclusions
3D optical acquisition is feasible for the documentation of crime scenes
Technology is ready
Market is ready
Investigators need it
The refereability of measurements and systems is crucial
Precise rules must be specified to avoid the operator manipulation of the models