Development of a photogrammetric-digital technology to measurement and documentation of buildings / Desenvolvimento de uma tecnologia fotogramétrico-digital para a medição e a documentação de edificações

AUTOR(ES)
DATA DE PUBLICAÇÃO

1998

RESUMO

An architectonic restoration project of an old building can more easily made when assisted by a computer system able to generate the original dimensions of the construction. A photogrammetric digital system was developed in this work to offer a very practical method for computing actual dimensions of a building for future restoration. Non existing architectonic drawings of partially damaged old buildings can be obtained with very acceptable precision using the system presented. By using stereoscopic pairs of photos of the building and a microcomputer the system is capable to produce construction´s tridimensional data. In this application the traditional and expensive stereometric cameras as much as the restorative instruments of images are replaced by relatively cheap usual photographic cameras and a microcomputer. After several experiences carried out with this method, tridimensional data were obtained from the studied object with deviations no greater than 2.8% of the real values. On the other hand only few dimensions were above 1% deviation and a great number of them did not show any deviation at all. The deviations of the real values were imputed to faults brought about during the photos taking and photos developing. The stereoscopic quality of the images was investigated by taking several sets of stereoscopic pairs of photos, computing their data and comparing them with the real object dimensions. Scanned images and the algorithm based on parallax theory supplied reliable 3D data which were used in the restoration project. By processing these data with a CAD system it was possible to obtaining the architectonic drawings of the original building.

ASSUNTO(S)

arquitetura (computação) computer science computação gráfica stereophotography graphics computer architecture arquitetura architecture (computers) photogrametry fotogrametria graphics computer computação gráfica computer aided design estereofotografia

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