Am 02.05.2010 03:49, schrieb tobio:
I have a question about hugin. I wonder what geometric transformation
the cylindrical projection used?
Perhaps http://wiki.panotools.org/Cylindrical helps. Cylindrical
projection maps the horizontal angle to linear distance and the vertical
angle to tangent.
That is to say, I have generated a 360 degree panoramic Image from 6
images using cylinderical projection, and there is a point A(x,y)(x,y
are pixel coordinates) on the fifth image, how can I calculate its
coordinates A'(x',y') on the panoramic image?
Coordination transformation implies the transformation of euler
(respectively Tait-Bryan) angles
-> http://en.wikipedia.org/wiki/Euler_angles
-> http://en.wikipedia.org/wiki/Yaw,_pitch,_and_roll
which isn't trivial at all. And if lens correction is involved it gets
even more complicated.
However, there is a special case: if all images are roll=0 and no lens
correction was used, you can calculate the angles (from center) inside
the source image using the appropriate formula for the input image
projection, add them to the yaw (horizontal) and pitch (vertical) values
of the image and transform them to image coordinates using the
appropriate formula. Note that yaw and pitch are measured from the
uncropped output image center.
If you simply want to mark special points in the output image it's far
easier to place marks in copies of the input images, mask the background
away and remap those images to TIFF output with the same project file
you did the original remap. You get an image with same dimensions and
transparently overlaid marks.
--
Erik Krause
http://www.erik-krause.de
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