Master thesis:
Development of a Hyperspectral Projection System
System overview of the Hyper Spectral Projection System
A commercial DLP projector was modified and its light source was replaced with a tunable supercontinuum laser. Using a stereo camera setup, the developed system can make both 3D and spectral measurements of objects, resulting in a pointcloud per wavelength.
The wavelength dependent effect on 3D measurement accuracy when scanning translucent materials was investigated on materials such as pigskin and nylon.
Overview of the constructed system. (1) Scene/target, (2) Cameras, (3) Projector, (4) Optical adapter, (5) HW controller, (6) Laser probe, (7) Laser filter. For illustration laser path has been drawn in green dashed line.
Results
The system was verified and tested in several different ways, one of which consisted of scanning a translucent nylon sphere, partly covered in chalk spray. The chalk spray serves as a reference surface which is not affected by the variation in wavelengths used for the scans.
Planning
The project was divided into three iterations. Each iteration was designed to end with a standalone product, each adding functionality to the previous iteration. Using a MoSCoW-inspired approach, the first iteration contains the minimal functionality which must be fulfilled. The second iteration adds functionality that should be realized. Lastly, the third iteration adds functionality that could be implemented if time permitted.
This thesis is written for evaluation of the joint master’s project for Ingimar Andersen and Troels Kjeldsen Kristensen at the Technical University of Denmark, Department of Applied Mathematics and Computer Science - in fulfillment of the requirements for acquiring an M.Sc. in Electrical Engineering. The project is carried out in the period 29/08/2018 - 29/01/2019 and concluded with examination on 06/02/2019.