ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2014, Vol. 11, No. 1, pp. 308-321

Construction of a three-dimensional model of an object based on stereo imagery

A.V. Nikitin1 
1 Space Research Institute, Russian Academy of Sciences, Moscow, Russia
At present, there is a wide range of ways to solve the task of building a digital model. With the aim of building a digital model of a ground survey object, the stereo photogrammetric method (shooting from fixed basis), widely used in the past in phototheodolite surveying, is proposed. In order to automate this method, different image conversion and correlation algorithms are used to select contour points and identify them on a pair of images. However, it is necessary to have a sufficient number of contrasting objects on the surface being surveyed.
In the paper, a digital model construction algorithm based on the stereo photogrammetric method with laser illumination is discussed. To build a digital model, simultaneous surveying was carried out by cameras with fixed basis and laser illumination providing projection of a glowing grid on the object.
The method consists in the following stages: preliminary cameras calibration by stars surveying and by dynamic test bench, setting the exposure time, defining external orientation elements by surveying the test object and, in the absence of it, analytical definition of relative orientation elements, switching laser illumination on, identification of the corresponding sites and definition of their spatial coordinates. The set of the spatial coordinates form the digital model of the object.
An example of software implementation according to the proposed algorithm is suggested.
Keywords: digital elevation model, elements of internal orientation of the camera, elements of external orientationof the camera, test-object, laser illumination
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