james barnett
Posts: 1
Location: seattle, United States
Registered: 3 Mar 2008
|
problems stitching interiors with ptgui pro
Posted: 3 Mar 2008 at 5:03 GMT
|
|
I did some qtvr work in the early to mid 1990s, using apple's qtvr authoring suite. I learned how at Apple in Cupertino. Then didn't do any for 10 years. I have a few panos to stitch again. I'm using canon eos rebel with canon 10-22 mm. lens. Ancient Kaidan pan head with modifications to take this lens. I'm doing one level of shots, 360 degrees. I take 8 vertical images.
My exterior panos stitch beautifully. My interior panos stitch horribly. There's plenty of detail for the stitcher to pick up, yet it can't seem to find any control points. The camera has not been moved from the pan head between the interior and exterior shots.
I guess I was hoping for something at least as easy to use as the canon photostitch software. Their software can stitch from a hand-held point and shoot.
What am I doing wrong?
|
|
alert moderator
|
|
Smooth
Posts: 1455
Location: Australia
Registered: 21 Jul 2004
|
Re: problems stitching interiors with ptgui pro
Posted: 3 Mar 2008 at 7:00 GMT
|
|
This is a classic case of not having the camera positioned to rotate around the No Parallax Point (NPP).
When objects are far away like the horizon things will stitch pretty easily. Though when objects are closer to the lens parallax comes into play.
Bottomline is you need to set your camera/lens up better and find the NPP of the lens. Once done this will overcome the issues you are having.
Regards, Smooth 
www.smooth360.info
|
|
alert moderator
|
|
John Houghton
Posts: 2265
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
|
Re: problems stitching interiors with ptgui pro
Posted: 3 Mar 2008 at 8:11 GMT
|
|
James, PTGui is only easy to use when you have learned how to use it! The issue of the control points is puzzling. It's unusual for PTGui not to assign any points at all, especially with a rectilinear lens. Interiors can be difficult to stitch when there are large expanses of plain walls and ceilings, and with furnishings without clear features for control points. You will have to intervene in the automatic process. Try assigning 4 control points per overlap manually, spreading the points vertically as much as posiible. You may discover why PTGui might have run into problems.
If you click on the Advanced button on the Project Assistant tab, you will have access to many more tabs by which you can control the stitching process, including the Control Points tab. Basically, you just click on the same feature in both windows to create one control point. Use the Next button to proceed from one pair of images to the next. After assigning the control points manually, it might help if you go to the Image Parameters tab and assign initial yaw values to the images: highlight all the yaw boxes by clicking in the first and dragging with the mouse down the column. Then click the Fill Yaw button at the bottom and click ok. This will set the required incrementing yaw values. The Panorama Editor window should now show a reasonable approximation of the final result. (If the Panorama Editor window is not open, load it from the Tools menu or the icon on the toolbar). Set the desired output projection via the Projection menu (e.g. 360x180 equirectangular). You then need to optimize to align the control points. You can do this by returning to the Project Assistant tab and use the Optimize button there. Use the Create Panorama tab to output your panorama.
John
|
|
alert moderator
|
|
Smooth
Posts: 1455
Location: Australia
Registered: 21 Jul 2004
|
Re: problems stitching interiors with ptgui pro
Posted: 3 Mar 2008 at 8:27 GMT
|
|
As you are looking for something easier to use you might like to look at Panoweaver by Easypano as it supports the 10-22mm Canon Lens under Wide Angle stitching.
Provided you have set the NPP correctly it will not require you to place any manual control points at all.
Regards, Smooth
www.smooth360.info
|
|
alert moderator
|
|
mhc1
Posts: 186
Location: Hamburg, Germany
Registered: 29 Dec 2005
|
Re: problems stitching interiors with ptgui pro
Posted: 4 Mar 2008 at 22:22 GMT
|
|
James,
as John mentioned: use manual CP´s.
Just for testing try Autopano, if this program gives you a acceptable result.
If yes: then you have to work hard on your CPs , if not:
there is a lot of Photoshop to do.
Or you can make a new 100% good set with your camera/lens combination - save this as a template and apply it.
It worked out on some panos I ´ve done with no CP´s set.
Ciao
Mike
www.360de.de
|
|
alert moderator
|
|
vrthree
Posts: 32
Location: Leeds, United Kingdom
Registered: 17 Aug 2005
|
Re: problems stitching interiors with ptgui pro
Posted: 10 Mar 2008 at 13:49 GMT
|
|
|
I an having the same problem with a project, all the other rooms I have done worked a treat no matter the size, but just one of them seems to not want to work!!!!!!
|
|
alert moderator
|
|
John Houghton
Posts: 2265
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
|
Re: problems stitching interiors with ptgui pro
Posted: 10 Mar 2008 at 15:14 GMT
|
|
In what way doesn't it work? If the automatic generation of control points doen't work, assign them manually. If the optimization/stitching is poor, have you tried using one of the successful projects as a template - still with control points but not optimizing lens distortion parameters?
John
|
|
alert moderator
|
|
vrthree
Posts: 32
Location: Leeds, United Kingdom
Registered: 17 Aug 2005
|
Re: problems stitching interiors with ptgui pro
Posted: 11 Mar 2008 at 21:10 GMT
|
|
|
Thanks for that, it worked perfect!
|
|
alert moderator
|
|
back to threads list |
this thread is closed