Error vectors of control points
4 em
Fig. 4.6
In the following testa-strongly curved surface is rectified
under the use of polynomial interpolation and
multiquadratic transformation (differential procedure).
Fig. 4.7 shows where the choosen test areais situated on
the façade. 74 control points determine the surface.
Level 6
Fig. 4.7 Orientation of the test region
A comparison of the results, for which was applied
bilinear, quadratic and multiquadratic interpolation, is
shownin Fig. 4.8. Regarding the course of the horizontal
Stone joints it can be recognized, that only a differential
procedure, as the multiquadratic interpolation, is able to
represent the position of the joints. The two polynomial
functions do not approximate the surface sufficiently,
what is followed by distortions.
Bilinear Quadratic Multiquadratic
Figure 4.8. Different Interpolations
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