Control point suggestions

[Bob Bryer]

I took a 360 by 180 pano of the inside of a chapel and used a 50mm lens with the idea of capturing as much fine detail of the murals, statues and religious artifacts as possible in the final result. The unintended consequence is that the ceiling is a dome painted in the same color with a single chandelier. I would up with several shots PTGui was unable to generate control points for due to too much of a single color and no chandelier section in the overlap.

I am manually adding control points which is complicated since the high pitch angle causes different angular direction from frame to frame, the frames are not of a wall section side by side but of square pieces of pie of a dome ceiling.

It looks like a tedious job finding irregularities that overlap frames. I am finding the EV adjustment in the control point table very helpful.

Has anyone know of some alternatives I can try to make life easier:

• Different stitcher?
• Any type of filtering?
• etc?

Thanks
Bob Bryer bbr...@gmail.com

PS
Next time I will use an lens wide enough to insure overlap in the largest expanse of a dome or featureless section. Live and learn.

[tracy....@comcast.net]

Bob,

 

I am having similar problems.  I recently took 12 pano shots using a fisheye lens on a tripod.  The subject was a large indoor arena with lots of detail (lines, etc).  I cannot get it to stitch together.  And when I add lots of control points and run optimizer, I get no better results.  Any hints?

 

Thanks!

 

Tracy R. Willis

---

From: "Bob Bryer" <bbr...@gmail.com>
To: pt...@googlegroups.com
Sent: Tuesday, October 9, 2012 8:29:21 AM
Subject: [PTGui] Control point suggestions

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[Geoff - Spherical Visions]

Can you not use the Align to Grid function ?  Any images with no control points are then moved in relation to those that do have CP's, so maintaining there positions.  Depending on how much gradual shading there is it may work well.  If each row used a different number of images then use the function several times to build up the overall layout of the images.

[John Houghton]

On Oct 9, 2:22 pm, tracy.wil...@comcast.net wrote:

> I am having similar problems.  I recently took 12 pano shots using
> a fisheye lens on a tripod.  The subject was a large indoor arena
> with lots of detail (lines, etc).  I cannot get it to stitch

> together.  And when I add lots of control points and run optimizer.

> I get no better results.  Any hints?

Tracy, If you have saved the project to a .pts file, can you upload a
copy to your personal web space or to the free file sharing site
http://www.ge.tt/ and post a download link here.

John

[Erik Krause]

Am 09.10.2012 14:29, schrieb Bob Bryer:
> I am manually adding control points which is complicated since the high
> pitch angle causes different angular direction from frame to frame

It can't be as bad as for fisheye images, where you not only have
different angles but also different distortion. However, for manual
control point setting it would be beneficial in any case to have the
relevant area of both images locally warped to the same projection. Just
an idea for Joost :-)

If you arrange the images manually in Pano Editor sometimes PTGui finds
control points in relatively small selected areas (large areas don't
work as well). Hold the shift key and drag a rectangle with the left
mouse button pressed, then right click in the rectangle and choose
"Generate Control Points Here".

If the overlap area is completely featureless it might be enough to have
the image roughly positioned manually without control points. For
non-HDR projects you can judge in Detail Viewer blended view. For HDR
projects disable all but the best exposed images on Create Panorama tab,
then disable HDR stitching on Exposure / HDR tab temporarily in order to
see the blended version.

--
Erik Krause
http://www.erik-krause.de

[Luc Villeneuve]

Hi,

I experienced the same problem with some images. Here is my response to this problem. 

I create a calibration room in my basement which is also my "studio". I then add all the control points manually, did an align image and save it as a template. These templates save me a lot of work. Panorama is an example. All paper strips, the Swovelin tape, with the crop marks, are spaced by 36°. With my 24mm lens, I take 10 shots around X 3 rows. I also did a 60° spacing for my 10,5mm.

I wanted to create a template to solve the kind of problem I had while producing a panorama with a lot of similar texture which can be confusing. Here is the panorama

Download the Swovelin tape I create your own. It will save you time.

Luc

[Erik Krause]

Am 09.10.2012 21:31, schrieb Luc Villeneuve:
> I wanted to create a template to solve the kind of problem I had while
> producing a panorama with a lot of similar texture which can be
> confusing. Here is the panorama

[missing] ?

[Luc Villeneuve]

To the calibration room...
http://www.360-image.com/tech/calibrationroom/index.html

To the Swovelin tape...
http://www.360-image.com/tech/SwovelinTape.pdf

Cheers!

[Luc Villeneuve]

Is this the kind of advice you were looking for?

[Erik Krause]

Am 09.10.2012 21:57, schrieb Luc Villeneuve:
> To the calibration room...
> http://www.360-image.com/tech/calibrationroom/index.html
>
> To the Swovelin tape...
> http://www.360-image.com/tech/SwovelinTape.pdf

You wrote about a panorama:
"...while producing a panorama with a lot of similar texture which can
be confusing. Here is the panorama..."

BTW.: Does the SwovelinTape refer to Pat Swovelin?

[Luc Villeneuve]

Well, my point is that sometimes, when similar patterns are spread all over the image, I am not a PTGui expert but I think that PTGui can have problem to precisely place control points.

I noticed that when I apply a good template first, the Align image operation is a lot more accurate. Am I right?

Yes it is in memory of Pat Swovelin. I met Pat at a IVRPA meeting in Palmela and we really had fun together. He was very creative.

Thank you

Luc Villeneuve
Craftsman of Photographic Arts

www.360-image.com

Studio: 1.418.628.0895
Mobile: 1.418.931.3600

[Erik Krause]

Am 09.10.2012 22:49, schrieb Luc Villeneuve:
> I noticed that when I apply a good template first, the Align image
> operation is a lot more accurate. Am I right?

Yes, definitely.

> Yes it is in memory of Pat Swovelin. I met Pat at a IVRPA meeting in
> Palmela and we really had fun together. He was very creative.

I would have so much liked to meet him, too. It's a shame...