How to stitch so precisely?

[Boon Ong]

Hi all,

I had done with my first Pano recently, using 5Dm2, Samyang 14mm lense.

The setting I did was 45degree on RD16, NN4 of 60degree up and down, with the nadir shot.

Everything looks good until I zoom in on PanoTour and found some misalignment during stitching. (please see attached)

How do I make sure that my control point is all good? Because after I had run the optimizer, and it mentioned that it is not so good. Is it better for me to run my own control point or? (Certain images are by me, if not, all by PT GUI )
How should I prevent this thing to happened?

I tried using mask on the error point, but it made the floor misaligned as well

Any advise?


p.s. I will be uploading my working file soon; in TIFF

[Henrik]

did you look at the error rate or the distance between control points when you press F5 (windows), if that gives you a high number then you have alignment errors or paralex  error

Henrik Tived

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Thu, 10 Jan 2013 00:57:04 -0800 (PST)

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[PTGui] How to stitch so precisely?

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[PTGui Support]

Hi Boon,

Please see 4.4:
http://www.ptgui.com/support.html#4_4

Looking at your images I'm pretty sure the problem is due to parallax.
Are you using a panoramic tripod head, and is it set up correctly?

Joost

[Boon Ong]

Thanks Joost, you are right about the parallax error occurred by me.

I should re calibrate my camera after I mount on it again; I shall go out and re shoot everything. Hope I can get it right this time!

Thanks for this great link - the tutorial made me understand in depth.

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Warmest regards,

Boon Ong

Have a nice day ahead!

[Michel Thoby]

Le 10 janv. 2013 à 09:57, Boon Ong a écrit :

Hi all,

(skip...)

Any advise?

After having set-up your shooting gears in the optimal way, I would recommend to read and use: 

http://michel.thoby.free.fr/Web_Gallery_&_Tests/Samyang%2014mm/Pano_with_8_shots_only.html

Michel

[Boon Ong]

Wow, thanks a lot, Michel.

The explanation is great.

For my understanding, the interval of 6shots is at 60degrees, with 30degree pointing up with a zenith image?

Having done for the upper image shot, next will be the lower part. Means, I will have a total of 15 shots, inclusive of Nadir shot using nadir adapter?

Am I getting it wrong or?

Thanks!

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[Chris Erskine]

even if you don't have your rig setup perfectly you still should be able to get a good stitch. it will just take a bit longer.

delete the worst control points. 

and manually create control points for any image pairs that are having issues (at least 3 control points per pair). this may end up being all the photos.

then optimize with lens shift.

then check your controls points again and depending on how you have done. you may need to repeat the process until your happy with it. 

chris

[Boon Ong]

Thanks Chris for the information.

A lot of work can be done on PhotoShop, yes, a bit longer in that sense.

For control point question, all we need to tell PT GUI that point 1 on image A and B must be in the same position? Or we can have control point at different position? e.g. a window with the straight line, image A point at position on top of window, while image B point at the bottom of window?

I was puzzled because of the control point positioning.

On Fri, Jan 11, 2013 at 7:21 AM, Chris Erskine <stupid....@gmail.com> wrote:

ally create control points for any image pairs that are having issues (at least 3 control points per pair). this may end up being all the photos.

[Chris Erskine]

you just need to find the exact same some spot on the 2 different images. and pick something that dosen't move in the wind or anything like that.

generally you'll need to pick the first two and after that ptgui dose a pretty good job automatically finding the spot in the 2nd image after that. so it gets quicker as you add more.

you'll get a much better final output by doing this extra work in ptgui vs fixing it in ps.

chris

[Boon Ong]

Thanks!

I had re calibrate the pano head, and going out to take some shot, hopefully I will not get the parallax error. =)

Cheers!

[Boon Ong]

Wow, i just wanted to share that I finally did it!

I had re calibrated the pano head, shot the images as what the tutorial had given, it turned out perfect. I had the control point - this is very good. All the stitching and images are flawless.

Am so happy about it!

Thanks all for the great help. Im gonna try another 2 more pano which I shot it today.

Cheers all!

[John Houghton]

On Jan 11, 3:37 am, Boon Ong <djo...@gmail.com> wrote:
> For control point question, all we need to tell PT GUI that point 1 on
> image A and B must be in the same position? Or we can have control point at
> different position? e.g. a window with the straight line, image A point at
> position on top of window, while image B point at the bottom of window?
>
> I was puzzled because of the control point positioning.

As Chris says, you place normal control points on identical features
in the two control point windows. Special control points ("vertical
line" control points) are assigned at opposite ends of a vertical line
feature like the edge of a window. These points are used by the
optimizer to level the panorama - i.e. get all the verticals level.
See this tutorial:

http://www.johnhpanos.com/levtut.htm

John