On Aug 19, 2006, at 12:03 AM, - AYRTON VR - wrote:
Ok guys, first of all THANKS a lot to all who replied to me.
It's a lot of people ... Hans, Rodolpho, Carl, Landis, Robert,
Roger, Andrew, Paul, etc...
Anyway here we go in the next move I did and how I'm in more
trouble yet :-)
My Client wants to make a big plotter from a 360º. It will be 7,5 X
1,5 meters printed w/ 72 dpi
That means more or less a 21.000 pixels wide image.
I shot 12 clicks (at 30º) with the D200 using a Nikkor 16mm
fullframe fisheye, f:11 at 1/125 ISO 100 NEF (3872 X 2592)
Now I'm getting trouble because I can not make anything good enough.
If I'm using PTMAC I can not figure out which LENS parameters to
add to my database and it just does NOT make a good stich (I'm not
even saying "perfect"). How does Hans calculate this would be a 86
degrees ???
Set lens to 16 mm and load the sensor size which is for the D200 23.6
x 15.8 mm 3872 x 2592
Click the calculate now and you have the HFOV and VFOV 57,17x86,55
With 12 images you have 47% overlap which is more than enough,
You need to cover 360 degrees 360/57 = 6,3
Multiplied with your resolution you get 6,3x2592 = 16329 pixels which
is what Photovista also gave you.
You should easy be able to stitch this in PTMac or PTGui (now also in
a Mac version)
Just load them and set the FOV to 57 (with imaqges rotated )
Just keep the a b c settings at zero and use the auto controlpoints.
Optimize first a and b and then the shifts.
At last you can optimize the FOV but it will probably not change much.
With PTMac you have to use enblend to get a good result. PTGui will
get perfect result with PTGuis own blending.
If you made the images at a perfect level you probably do not need to
adjust the anchor image.
With 87 degree FOV I would say it looks best as a cropped spherical
image. The proportions will be around 1-5
Hans
www.panoramas.dk
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