Petteri Pöntinen

Cocentric image capture for photogrammetric triangulation and mapping and for panoramic visualization

The paper deals with concentric image capturing and its use for mapping and visualization purposes. The work is based on a photogrammetric approach in composing hemispheric images from concentric image sequences.

Airborne 3D profilometer

Measurements of dimensions of inaccessible objects remains a challenge in spite of new technologies available. The authors of this article approach the problem with a photogrammetric method using a laser-camera combination installed in a helicopter. The method was applied to the topographic measurement of ice fields.

Three-dimensional digitizing of objects using stereo videography

We discuss an off-line 3D measuring procedure under development in a project for the national program on machine vision in Finland 1992-1996. The procedure consists of four concurrent phases: (1) recording, (2) rectification, (3) digitizing, and (4) modeling. The recordings are based on sequential stereo videography, and the continuous object digitizing is based on the rigid normal case of stereography. The system modules are as follows: (1) two video cameras, (2) controllable feature projector, and (3) photogrammetric station. The procedure is interactively linked to a CAD/CAM-environment both for reverse engineering and quality control use.