proj-imim:
Re: Number of Control Points, was Re:
Peter Murphy 2001-Jan-06 10:57:16
Hi Richard
re t-control points and morph-to-fit
see
http://listserv.fh-furtwangen.de/cgi-bin/lwgate/lwgate-en-proj/PROJ-IMIM...
where they get a going-over
briefly
t1 can be appended to control point lines to tell the optimizer that the
point pair
locations in those lines correspond to vertical features in the scene
- eg the side of a building (ie "ignore y when optimizing")
These point pairs can be in the same image or different images.
t2 is the same thing except it tells the optimizer the point pair locations
are on the same horizontal line - useful when the horizon is visible or
you want to rotate a horizontal rectilinear shot so a building is square on
in the frame (ie "ignore x when optimizing")
the morph-to-fit flag "u" can be appended to image lines to tell the
optimizer
to move the control points in those images
in the stitching process so they fit exactly
by warping the images
v=0
means the field of view of the lens in this
this image line is the same
as the field of view of the lens used
in image 0 ....ie if you are using the same lens
throughout set v=0 in all image lines after the
first ....ditto for a=0 etc
I am not clear on the various contexts in which
X,Y,Z are used so maybe someone else can explain those
cheers
Peter
cheers
Peter Murphy
Richard Moore wrote:
> Peter Murphy wrote:
>
> > t factor lines make it much more certain that ones answer is
> > physically accurate. I would usually use at least a couple of t1 factor
> > lines for at least one image (generally the first) for any
> > sequence where scene verticals were visible. In this case you
> > must optimize r0 and p0 and not set them to zero as one
> > normally would.
>
> OK, what are t factor lines?
>
> While I'm asking, I've been wondering, what are the "X0 Y0 Z0"
> entries at the end of each i line? And what is the effect of having,
> say, "v=0" in the i line?
>
> What Peter means by the "morph to fit" flag?
>
> -- Richard