Re: [hugin-ptx] What kind of lens does hugin call a Rokinon 8mm?

[Brandon]

>
> On Thursday, October 16, 2014 1:02:34 PM UTC-7, David Benes wrote:Hi 
> Brandon,
> is seems, that it is the same lens as Samyang 8mm f/3.5 (except the 
> removable hood).
> That Samyang has stereographic projection.
>
> Regards
> David
>


On your advice I just tried a stereographic projection and re-optimized one 
of my projects and it looks great!  I had tried the other settings that I 
mentioned above and it never worked out. I was starting to worry that the 
lens would not work with hugin.

A big thanks, getting that right makes me a lot happier person :)

I still need to figure out how the correct lens parameters. The two 
projects that I just loaded and optimized are now doing very well. The only 
complainant is that the extreme edges are not quite lining up right. 
Hopefully a night of messing around I can get them corrected.

To shift the question a little bit, how does a person know what kind of 
projection is the correct one for their lens and or camera combo? I read 
everything there was with my lens and there was no mention of anything that 
would have lead me to think stereographic.

On the Canon T5, the lens behaves as a full frame fisheye.  The focal 
> length usually works out nearer 9mm than 8mm, but the optimizer will 
> evaluate the correct hfov when you stitch a full 360x180 panorama. 
>
> John
>

 I was thinking the way you were and had been trying the various fisheye 
projections and it was not working. Maybe someone has some insight as to 
why it turns out to be a stereographic instead?

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Re: [hugin-ptx] Mosaics with a Copy Stand

[Bruno Postle]

On Thu 16-Oct-2014 at 10:41 -0700, Michael Perry wrote:

I stitch mosaics using Hugin. My camera is mounted to a copy stand and can
slide in both X and Y and uses a (calibrated) Macro lens about 40cm above
the artwork.

I am convinced that I am not using the right optimisation processes in
Hugin. The workflow is:

•  Optimise in x and y to get all the images in roughly the right place and
spot cpfind Control Point errors (if any)
•  Optimise in all of y,p,r,x,y and v to bring down the errors

As the HFoV approaches some (arbitrarily) small value, optimisation is
complete. That just seems a bit wrong.


You need an anchor image that has fixed values for XYZ, and there is 
no need to optimise v if the photos are all parallel.


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Bruno

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Re: [hugin-ptx] Mosaics

[Terry Duell]

Hello Michael,

On Fri, 17 Oct 2014 04:35:46 +1100, Michael Perry   
wrote:


I stitch mosaics using Hugin. My camera is mounted to a copy stand and  
can slide in both X and Y and uses a (calibrated) Macro lens about 40cm  
above

the copy artwork.

I am convinced that I am not using the right optimisation processes in
Hugin. The workflow is:

•  optimise in x and y to get all the images in roughly the right place  
   and spot cpfind Control Point errors (if any)


•  optimise in all of y,p,r,x,y and v to bring down the errors

As the HFoV approaches some (arbitrarily) small value, optimisation is
complete. That just seems a bit wrong.


I haven't tried to stitch shots from a copy stand as you describe, so this  
is a bit of guess.
I would think that you should be optimising all your translation  
parameters (X,Y,Z).
When the camera slides in X and Y the Z value will probably alter,  
although only a very small amount.
Stitching images from a flat scanner is a close approximation to your  
case, as you're using a calibrated lens. For scanned images I get good  
results optimising positions and translations.

If I also optimise view I don't see hfov vary very much.
Try optimising positions and translation (y,p,r,X,Y,Z).

Which version of hugin are you using?

Cheers,
--
Regards,
Terry Duell

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Re: [hugin-ptx] What kind of lens does hugin call a Rokinon 8mm?

[David Benes]

Hi Brandon,
is seems, that it is the same lens as Samyang 8mm f/3.5 (except the
removable hood).
That Samyang has stereographic projection.

Regards
David

2014-10-16 21:18 GMT+02:00 Brandon :

> I have a new fish eye lens and I do not know what to tell hugin it is.
>
> It is a dead lens, so it does not have any exif data for hugin to look at
> so I need to put it in by hand. The lens is a
> Rokinon HD8M-C 8mm f/3.5 HD Fisheye Lens with Removeable Hood for Canon
> DSLR 8-8mm, Fixed-Non-Zoom Lens
>
>
> http://www.amazon.com/gp/product/B008X1C4IY/ref=oh_aui_detailpage_o03_s01?ie=UTF8&psc=1
>
>
> The part that has me stumped is it a normal lens, circular fish eye, a
> full frame fish eye or something else? I am using it on a cannon rebel t5
> if that makes any difference. It has a focal multiplier of 1.585x
>
>
>  --
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> .
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>

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[hugin-ptx] Re: What kind of lens does hugin call a Rokinon 8mm?

[panostar]

On Thursday, October 16, 2014 8:18:12 PM UTC+1, Brandon wrote:

> I have a new fish eye lens and I do not know what to tell hugin it is. 
>

On the Canon T5, the lens behaves as a full frame fisheye.  The focal 
length usually works out nearer 9mm than 8mm, but the optimizer will 
evaluate the correct hfov when you stitch a full 360x180 panorama. 

John

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[hugin-ptx] What kind of lens does hugin call a Rokinon 8mm?

[Brandon]

I have a new fish eye lens and I do not know what to tell hugin it is. 

It is a dead lens, so it does not have any exif data for hugin to look at 
so I need to put it in by hand. The lens is a 
Rokinon HD8M-C 8mm f/3.5 HD Fisheye Lens with Removeable Hood for Canon 
DSLR 8-8mm, Fixed-Non-Zoom Lens

http://www.amazon.com/gp/product/B008X1C4IY/ref=oh_aui_detailpage_o03_s01?ie=UTF8&psc=1


The part that has me stumped is it a normal lens, circular fish eye, a full 
frame fish eye or something else? I am using it on a cannon rebel t5 if 
that makes any difference. It has a focal multiplier of 1.585x


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[hugin-ptx] Mosaics with a Copy Stand

[Michael Perry]

I stitch mosaics using Hugin. My camera is mounted to a copy stand and can 
slide in both X and Y and uses a (calibrated) Macro lens about 40cm above 
the artwork. 

I am convinced that I am not using the right optimisation processes in 
Hugin. The workflow is:

•  Optimise in x and y to get all the images in roughly the right place and 
spot cpfind Control Point errors (if any)
•  Optimise in all of y,p,r,x,y and v to bring down the errors

As the HFoV approaches some (arbitrarily) small value, optimisation is 
complete. That just seems a bit wrong.

•  Surely I should have a constant yaw, pitch and roll? One that is applied 
to all of the images (including the anchor image). After all the camera 
only moves in X and Y and the artwork is fixed.
•  Should I be using the Plane Yaw and Plane Pitch tools - but how?
•  Is the importance of the HFoV in achieving optimisation a reflection of 
panotools origins as a panorama tool?

Any thoughts would be much appreciated.



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[hugin-ptx] Mosaics

[Michael Perry]

I stitch mosaics using Hugin. My camera is mounted to a copy stand and can 
slide in both X and Y and uses a (calibrated) Macro lens about 40cm above 
the copy artwork. 

I am convinced that I am not using the right optimisation processes in 
Hugin. The workflow is:

•  optimise in x and y to get all the images in roughly the right place and 
spot cpfind Control Point errors (if any)
•  optimise in all of y,p,r,x,y and v to bring down the errors

As the HFoV approaches some (arbitrarily) small value, optimisation is 
complete. That just seems a bit wrong.

•
•  Is it a reflection of panotools origins as a panorama tool?
•  Should I be using the Plane Yaw and Plane Pitch tools 

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Re: [hugin-ptx] Re: Hugin Translation x PTGui Viewpoint optimization

[Carlos Eduardo G. Carvalho (Cartola)]

2014-10-14 16:07 GMT-03:00 panostar :

> Not long ago I worked out a technique for stitching hand held panoramas
> (no philopod or plumb line) using viewpoint correction in PTGui that has
> been surprisingly effective.  Normally, a hand held nadir shot aligns with
> images shot from a tripod mounted camera without any difficulty, using vp
> correction for the nadir alone.  When all the images are hand held, the
> horizontal row of images won't themselves align with each other well enough
> to accept the nadir image alignment.  The trick I have devised involves
> adding the horizontal row of images a second time into the project.  The
> additional images are treated as nadir shots and aligned with viewpoint
> correction applied.  Image areas that are not part of the flat floor/ground
> are masked away.  A few control points around the edge of this floor area
> are assigned to link it to the normal row of images.  The features used for
> this are in the reasonably far distance and therefore relatively immune
> from parallax effects.  The floor areas in the normal horizontal row of
> images are masked away.  The combined sets of horizontal images then
> provide a nicely aligned floor area to which the handheld nadir shot can be
> aligned very well.
>
> This technique can be startlingly successful.  This is the first panorama
> I tried this technique on:
>
> http://www.johnhpanos.com/spherical/peterbor2/peterbor2.html
>
> Paving is notoriously difficult to stitch well in hand held panoramas, yet
> what you see in the above panorama is straight out of the stitcher without
> any Photoshop post processing to correct minor glitches (other than coping
> with 3D features like people, who are not part of the flat floor and
> therefore distorted by the viewpoint correction transformation).
>
> I should think the same technique could be used in Hugin too.
>
> John
>

Tks John. I guess I've already seen a page where you describe this
workflow. Quite interesting. In my workflow I don't have a nadir picture. I
am usually doing 4 pics with pitch variation and I am searching for ways to
minimize eventual parallax errors. I use to see Zeljko Solectic panos and
he frequently mentions the use of viewpoint correction in similar
situations.

I hope I will have time until next week to study all options suggested here
and if I come to any conclusion I will share here.

Thank you all!

Carlos E G Carvalho (Cartola)
http://cartola.org/360
http://www.panoforum.com.br/

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Re: [hugin-ptx] Hugin Translation x PTGui Viewpoint optimization

[Carlos Eduardo G. Carvalho (Cartola)]

2014-10-14 18:11 GMT-03:00 Bruno Postle :

> The Hugin mosaic mode fits images to a flat plane, usually in the middle
> of the output panorama.  So if your mosaic is a floor rather than a wall,
> you need to arrange your output panorama so the nadir is in the centre of
> the canvas - This is probably not what you want a spherical panorama to
> look like.
>
> Hugin 2014.0 has Tpy and Tpp parameters to tilt this plane and put it
> anywhere you like - This is what you need.
>

Tks Bruno.


Carlos E G Carvalho (Cartola)
http://cartola.org/360
http://www.panoforum.com.br/

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Re: [hugin-ptx] Re: Hugin Translation x PTGui Viewpoint optimization

[Carlos Eduardo G. Carvalho (Cartola)]

2014-10-14 19:51 GMT-03:00 Brandon :

> Could a person stitch the pano together with everything other than the
> handheld down shot. Stitch it take the result and turn it into a cube. Then
> take the floor side of the cube and using the mosaic stuff that hugin has
> put the hand held down shoot onto the floor side of the cube?
>
> I have not had a down shot bad enough that I have done it yet, but I have
> wondered about it and if that would be possible.
>

This is more or less what I've done here:
http://cartola.org/panoforum/viewtopic.php?f=19&t=32 - it is in Portuguese,
but the images show the workflow. A cube and a displaced nadir with
perspective corrected using vert and horiz lines. It works perfectly, but
nowadays I am frequently using no tripod.


Carlos E G Carvalho (Cartola)
http://cartola.org/360
http://www.panoforum.com.br/

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