Telecentric Lens Plug-in
Project Description
This work required the development of a telecentric lens plug-in for DIRSIG. This plug-in would closely mimic DIRSIG's OrothImage plug-in, however, still allow for depth of focus effects as seen from the telecentric lens. A telecentric lens is useful because it will reduce parallax and distortion for enhanced measurement accuracy. Once the plug-in was developed, images were produced that would simulate strands from a 3D-printer placed in various lattice configurations on a set of aluminum plate backgrounds. Each structure was imaged one layer at a time and only layers near the top were to remain in focus.
Figure 1: Nominal pinhole operation of DIRSIG viewing spheres of the same size (1cm diameter) but the left is 0.5m further away from the camera.
Figure 2: Using the telectentric lens plug-in by specifying the telecentricity (maximum allowed angle away from normal) in degrees, magnification, and focus distance in meters. This shows that although the spheres are at different distances, their magnifications appear constant