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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B5. Istanbul 2004
Surface rendering, which involves the generation of a 3D model
with real world surface texture, is constructed, Figure 7. That is,
surface textures are added to the 3D model surfaces to give a
real world appearance to the displayed model. 3D surface
rendering is very important for the presentation of ruined
heritage sites where architects and renovation experts must have
a realist view of the ruin for further inspiration (Ogleby 1999).
Moreover, the 3D model can be digitally rotated to give a whole
range of perspective views.
Figure 7. 3D model of the church with surface rendering
5. CONCLUSION AND RECOMMENDATION
In this study, we have presented an operational approach for the
reconstruction of historical buildings. The output is in standard
(AutoCAD) format, which directly supports the visualization of
the reconstructed scene. The method is fast, reliable, and
flexible with respect to the level of detail. The approach
requires accurately measured 3-D points and the ability of the
operator to interpret the scene and to subdivide complex
structures into manageable sub-units.
[n order to guarantee the accuracy and stability of IOP, straight
lines constraints are incorporated in a bundle adjustment with
self calibration. The lines are defined by a sequence of
intermediate points along the line. Those points are
monoscopically measured (there is no need to identify
conjugate points in overlapping images) The suggested
approach for camera calibration has the following advantages:
" Automation of the intermediate point measurements along
the linear features improves the efficiency of the suggested
approach.
* Non-photogrammetric users of off-the-shelf digital cameras
can carry out the calibration procedure. This is important
since it will allow such users to generate high quality
photogrammetric products from regular digital cameras.
Our main goal, while developing this approach, was to show the
feasibility of 3D reconstruction from a low-cost camera. Future
work will focus on building a complete system that allows the
user to perform three-dimensional measurements of the objects
of interest (ie, if those objects can be incorporated in the
calibration test field, then the measurements and calibration can
be done simultaneously).
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