Hallöchen!
Torsten Bronger writes:
> [...]
>
> The origin of my coordinate system is the centre of the image.
> The x axis is horizontal, the y axis vertical. The vanashing
> point (i.e. intersection of the grey guide lines) is at (0, y_VP).
> W.l.o.g., y_VP is positive.
I forgot to mention that the upper right corner is at (1, 1).
> [...]
>
> The idea behind it is that at the equal-scale-line, the incident
> angle of the light ray on the sensor is the same as on the
> surface. Therefore, I have no magnification effect (angle-wise)
> there. Just like for the case of a non-tilted picture.
I'd like to elaborate this. It means that seen from the side
(cross-section), the surface, the sensor plane, and the light ray
form an isosceles triangle. The intersection of surface plane and
the sensor plane is the vertex of that triangle. I call alpha the
angle at that vertex. Then,
y_VP = f/d * cot(alpha)
y_ES = f/d * tan(alpha/2)
This leads the my formula in the previous post.
Tschö,
Torsten.
--
Torsten Bronger Jabber ID: [email protected]
or http://bronger-jmp.appspot.com
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