Calibration of a Photogrammetric System for Semiautomatic Measurement: CaM-DisT®
Nowadays some measurement tasks are usually made by the joint use of different systems, techniques, even sciences, trying to find the best results together with less work time. This is the case of close range photogrammetry and laser distancemeter. It is possible to find some works where they are applied together in so different sceneries as architectonic conservation, civil engineering, building, etc. One of the scopes where these techniques can be applied is in the measurement of facades of buildings in construction [1,2]. During the constructive process it is necessary to make periodic measurements, and also during the whole life of the building, as a control tool . At the present day some of these measurements are hand-made, with the risk of having an industrial accidents in some situations. In this work we present a methodology based on a photogrammetric - distancemeter joining measure system, in order to semi-automate some measurement procedures in building construction. The system consists of a semi-rigid calibrated support putting up a laser distancemeter and a digital camera, called CaM-DisT®. The support was specifically designed for this kind of application. The development of the system was made in four steps: establishment of the mathematical background; design of the support; construction of the support; and calibration of the complete system. The calibration process was made by two different alternatives which are xpounded this contribution in detail.
Guo Fan JIN, Wing Bun LEE, Chi Fai CHEUNG and Suet TO
P. Arias et al., "Calibration of a Photogrammetric System for Semiautomatic Measurement: CaM-DisT®", Key Engineering Materials, Vols. 364-366, pp. 259-264, 2008