Combined Automatic and Manually-Assisted Photogrammetric Measurement in Non-Controlled Environments

Abstract

Automated vision metrology works remarkably well, and Clive Fraser starts by asking why: special targetting and controlled illumination, with fully automatic off-line orientation from an exterior-orientation device and coded targets. That answer is also the restriction, because the automation does not extend to non-retro or natural features. The talk then works through what to do when the environment is not controlled: combining automatic with manual point measurement, coded-target strategies outside the lab, an alternative network orientation scheme, and the image point correspondence problem that gets harder as soon as the targets stop cooperating – with worked examples of both automatic and manually-assisted measurement.