Re: [hugin-ptx] Re: Fisheye image set?

2012-01-21 Thread Thomas Pryds 
2012/1/20 Erik Krause 

> Me too. This doesn't need to be an expensive one. The Samyang 8mm (also
> sold under different brands) will do:
> http://michel.thoby.free.fr/**SAMYANG/Early%20test%20report.**html
>

Thanks for the recommendation. I see that this page also links to an image
set shot with this particular lens. I will try having a look at these
images, and have this lens in my mind with looking for one to buy.


> If you want full frame (on full frame sensor), get a Zenitar 16mm
>

Thanks. I think I'm for a circular one, though. Although I don't have much
to base this preference on ;-)

Thomas

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Re: [hugin-ptx] Fisheye image set?

2012-01-21 Thread Markku Kolkka 
21.1.2012 9:55, Thomas Pryds kirjoitti:
> But from what I can see from your list of hardware, your lens is a
> circular fisheye. Wouldn't that always result in image files with a
> circular image area sorrounded by a black area

No, the Samyang (a.k.a Opteka/Bower/Vivitar/Walimex) fisheye covers the
full APS-C frame.

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Re: [hugin-ptx] cpfind "exception: bad allocation" with Hugin 2011.4.0.cf9be9344356

2012-01-21 Thread Gnome Nomad 

On 01/20/2012 12:09 AM, Harry van der Wolf wrote:



2012/1/20 Gnome Nomad mailto:gnomeno...@gmail.com>>


cpfind runs quite happily as a 64bit executable on Linux. Can't
think of anything in the code that would prevent it from being a
64bit Windows executable.


Theoretically you are right off course.
However, definitions of "variables, defines, etc" (I'm here on very
slippery ice as I'm not a programmer) could cause these kind of things
to happen. I've seen and experienced this before when we were working on
celeste, some google SOCs ago (and also for avidemux for which I used to
be the apple maintainer). The gcc implementations slightly differ per
platform which sometimes require different definitions on different
platforms. Hence the  __Win32__ and __APPLE__ and __GNU__  (and more)
if-then-else statements you will find occasionally in the code.

I can compile cpfind as a 64bit binary on Mac OS X without problems
whatsoever. On use however it crashes with a BUS error.


I'm no programmer either. Guess we'll have to let the programmers handle it.

--
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wandering the landscape of god
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[hugin-ptx] Re: Fisheye image set?

2012-01-21 Thread kfj 
On 21 Jan., 09:09, Thomas Pryds  wrote:
> 2012/1/20 Erik Krause 
>
> > Me too. This doesn't need to be an expensive one. The Samyang 8mm (also
> > sold under different brands) will do:
> > ...

see also

http://www.lenstip.com/160.11-Lens_review-Samyang_8_mm_f_3.5_Aspherical_IF_MC_Fish-eye_Summary.html

I use and like this lens as well.

> Thanks. I think I'm for a circular one, though. Although I don't have much
> to base this preference on ;-)

With a full frame fisheye, particularly with the Samyang with it's
stereographic projection, you can take quite nice very-wide-angle
images which don't look quite as distorted as 'real' fisheye images.
And keep in mind you waste quite a bit of sensor surface with a
circular fisheye (about half the image comes out black) - this will
reduce your useful amount of pixels, and if, for example, you just
have a 12MP sensor and make a panorama, you won't be able to zoom in
very far.

On top of that the Samyang is a real bargain.

You may also want to have a look at

http://wiki.panotools.org/Special_issues_with_fisheye_lenses

for more on fisheyes

Kay

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Re: [hugin-ptx] Re: Fisheye image set?

2012-01-21 Thread Carlos Eduardo G. Carvalho (Cartola) 
 2012/1/21 kfj <_...@yahoo.com>

> And keep in mind you waste quite a bit of sensor surface with a
> circular fisheye (about half the image comes out black)
>

But this will only happen in a full frame sensor camera. As Markku has
said, the Samyang lens covers the full APS-C sensor, which is the sensor of
most amateur people like me, as the cheaper canon with fullframe sensor
body starts at more than US$ 2,000.00. In Brazil, where it is imported, it
goes up to the equivalent of US$ 4,000.00.

Cheers,

Carlos E G Carvalho (Cartola)
http://cartola.org/360

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Re: [hugin-ptx] Fisheye image set?

2012-01-21 Thread Thomas Pryds 
2012/1/21 Markku Kolkka 

> 21.1.2012 9:55, Thomas Pryds kirjoitti:
> > But from what I can see from your list of hardware, your lens is a
> > circular fisheye. Wouldn't that always result in image files with a
> > circular image area sorrounded by a black area
>
> No, the Samyang (a.k.a Opteka/Bower/Vivitar/Walimex) fisheye covers the
> full APS-C frame.
>

Ah, so with a Canon EOS 500D like mine, which does indeed have the APS-C
sensor, there really no choice between circular and full frame no matter
the lens... (?)

Thomas

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Re: [hugin-ptx] Fisheye image set?

2012-01-21 Thread Carlos Eduardo G. Carvalho (Cartola) 
 2012/1/21 Thomas Pryds 

> 2012/1/20 Carlos Eduardo G. Carvalho (Cartola) 
>
>> I have put online some samples taken with a T2i (not full frame) using an
>> Opteka 6.5mm:
>>
>> http://cartola.org/arquivos/Samples_T2i_Opteka6.5.zip
>>
>
> Thank you a lot! The only "real" problem I encountered when trying to do a
> panorama from scratch from your image set was figuring out the focal length
> and multiplicator, but I always have troubles with this, with image files
> that lack this info. Anyway, when I copied the values from your pto file,
> everything went smooth.
>

Yeah, that lens doesn't put it on the exif information. It took me sometime
to calibrate it. I usually work with a file I have saved after a good
stitch. I load it in "Load lenses parameter".

When using lenses like that you can follow these tutorial:

http://hugin.sourceforge.net/tutorials/calibration/en.shtml

In fact I did this calibration once and saved the file. After my first good
360 stitch I saved the file of that stitching and use it until today. Even
using the calibrated file it is still necessary to do v optimization
everytime. In my experience the optimization has been more successful doing
optimization first with the horizontal images, without zenith and nadir.



>
> I really don't know if someone would notice the difference of a panorama
>> made with a true fisheye or that lens you put on top of a non fisheye. I
>> guess you probably can have some black borders with that, like you would
>> have with a true fisheye in a fullframe camera. I had them when I used one
>> in a point and shoot.
>>
>
> But from what I can see from your list of hardware, your lens is a
> circular fisheye. Wouldn't that always result in image files with a
> circular image area sorrounded by a black area (because all of the
> projected light is covered by the camera's sensor)? Or does that depend on
> the camera, also? Or perhaps you cropped the images?
>

I didn't crop the image, the camera has a 1.63 crop factor. As already said
by Markku and me in a previous email, it will happen only if your sensor is
a full frame.


>
> You can think about your money, purpose and opinion. Do you have the money
>> for a true fisheye? Will you miss this money? Are you professional or
>> amateur?
>>
>
> Definitely amateur. Only doing this for the fun of it :-)
> So I do have to think of the money, indeed, but if I'm not mistaken it
> should be possible to get a used lens in a very nice condition at a fairly
> acceptable price.
>
> The main reason I thought of getting a fisheye is that it will enable me
> to cover the same area with fewer images. Doing the (few) panos I did with
> my 18-55 mm zoom lens I had to shoot a lot of images in order to cover
> everything, and then still it is easy to miss a small spot here and there.
> Also, stitching so many images (e.g. 42 for one of them, at 18 mm) means a
> lot of CPs and other things to keep track of.
>
> So one of the things I learned by this process of stitching others' image
> sets, was that a circular fisheye covers the widest angle, while a
> fullframe covers slightly less (obviously). Coverage at the expense of
> image resolution, of course.
>

Yes, that's it. I am also an amateur, but if you won't miss that money...
Here in Brazil there is another thing to take into consideration: our
import taxes are very high, so, if you travel abroad or know someone who
can bring you that, you can sell it used here for more than you have paid
on USA for example. When you travel you can bring it without taxes to
Brazil. I bought all my equipment in that way (lucky me). So, if I need to
get the money back someday I will probably earn some money :). It has been
an investment.

About the resolution, think carefully about that. Nowadays I prefer to use
a Sigma 10-20mm in my APS-C sensor to get more resolution. At 10mm it is
possible to use 16 images to cover the sphere. I sometimes went unsatisfied
with the resolution I got with the 6.5mm. In fact I guess I did only about
2 panoramas at 10mm, and increased the final image size only in one of them:

http://cartola.org/360/en/2012/01/20/noble-room-at-naval-club-in-rio-de-janeiro-brazil/

but after finishing these and finally got able to edit the final image in a
new computer I bought I guess this will be my lens choice for next
panoramas.

Cheers,

Carlos E G Carvalho (Cartola)
http://cartola.org/360


>
> Thomas
>
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Re: [hugin-ptx] Fisheye image set?

2012-01-21 Thread Carlos Eduardo G. Carvalho (Cartola) 
2012/1/21 Thomas Pryds 

> 2012/1/21 Markku Kolkka 
>
>> 21.1.2012 9:55, Thomas Pryds kirjoitti:
>> > But from what I can see from your list of hardware, your lens is a
>> > circular fisheye. Wouldn't that always result in image files with a
>> > circular image area sorrounded by a black area
>>
>> No, the Samyang (a.k.a Opteka/Bower/Vivitar/Walimex) fisheye covers the
>> full APS-C frame.
>>
>
> Ah, so with a Canon EOS 500D like mine, which does indeed have the APS-C
> sensor, there really no choice between circular and full frame no matter
> the lens... (?)
>
> I am not completely sure, but think it is the truth.

Cheers,

Carlos E G Carvalho (Cartola)
http://cartola.org/360

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Re: [hugin-ptx] Fisheye image set?

2012-01-21 Thread Markku Kolkka 
21.1.2012 14:41, Thomas Pryds kirjoitti:
> Ah, so with a Canon EOS 500D like mine, which does indeed have the APS-C
> sensor, there really no choice between circular and full frame no matter
> the lens... (?)

There are circular fisheyes for APS-C, for example Sigma 4.5mm F2.8
http://www.sigma-photo.co.jp/english/lens/digital/45_28.htm and Sunex
5.6mm F5.6 http://www.superfisheye.com/

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Re: [hugin-ptx] Fisheye image set?

2012-01-21 Thread Carlos Eduardo G. Carvalho (Cartola) 
Guess those on a full frame sensor would do only a little ball image in the
midle :)

Carlos E G Carvalho (Cartola)
http://cartola.org/360



2012/1/21 Markku Kolkka 

> 21.1.2012 14:41, Thomas Pryds kirjoitti:
> > Ah, so with a Canon EOS 500D like mine, which does indeed have the APS-C
> > sensor, there really no choice between circular and full frame no matter
> > the lens... (?)
>
> There are circular fisheyes for APS-C, for example Sigma 4.5mm F2.8
> http://www.sigma-photo.co.jp/english/lens/digital/45_28.htm and Sunex
> 5.6mm F5.6 http://www.superfisheye.com/
>
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[hugin-ptx] Re: Fisheye image set?

2012-01-21 Thread Erik Krause 

Am 21.01.2012 09:09, schrieb Thomas Pryds:

I think I'm for a circular one, though. Although I don't have much to
base this preference on ;-)


With a (true) circular one you simply waste half of your sensor pixels. 
If you shoot sphericals you get a much lower resolution. For a table see 
http://wiki.panotools.org/DSLR_spherical_resolution


--
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Re: [hugin-ptx] [OSX] 20120119 Updated Hugin bundle hugin-mac-2011.5.0.5723_cd2f5e37af3b_Lion: openMP enabled Lion compatible enblend?

2012-01-21 Thread AKS-Gmail-IMAP 
This one seemed to work on both ppc and intel Leopard 10.6 but in the  
past flurry of testing I only tested the GL fast Preview and not also  
the old school Preview that I normally seldom visit. This Hugin  
crashed on both platforms when trying the old school Preview. The  
console reports a segmentation fault. I see the same crash when going  
back a few issues of 2011.5 but not in the 2011.4 release version you  
mentioned updated on January 18.


Alan

On Jan 19, 2012, at 6:41 AM, Harry van der Wolf wrote:


Hi Mac users,

I rebuilt the X86_64 part of enblend/enfuse with gcc 4.6.2. From a  
few links on the web it seems that Lion has a terrible, still not  
fixed, bug with regard to OpenMP. gcc 4.6.x is supposed to fix/work  
around this. So I installed gcc 4.6.2 on my snowLeopard box and  
recompiled enblend/enfuse for OpenMP.


It does work on my snow Leopard and it seems to be faster as well  
(now OpenMP 2008-5 instead of OpenMP 2005-5).


As it is actually the same bundle as the previous one I gave it the  
extension Lion. (That doesn't mean it doesn't run on Tiger or (Snow)  
Leopard. It's just to focus on the Lion users).


Please Lion users: test this latest bundle and please try to use the  
builtin enblend/enfuse: both are now supposed to run on Lion  
(fingers crossed).
Also Leopard and SnowLeopard users: test whether this one still  
works for you as well.
Tiger users still have to use the version from the enblend- 
enfuse-4.0 folder.


Note: this bundle doesn't contain multiblend or the development  
versions of enblend/enfuse. It's strictly a "test OpenMP enblend/ 
enfuse on Lion bundle".



Information and binaries via my website
.
(The binaries themselves are served from hugin.panotools.org who  
kindly provide the disk space and bandwidth).


Hoi,
Harry

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Re: [hugin-ptx] Fisheye image set?

2012-01-21 Thread Thomas Pryds 
2012/1/21 Carlos Eduardo G. Carvalho (Cartola) 

> Guess those on a full frame sensor would do only a little ball image in
> the midle :)


Something like
http://goo.gl/XF2xB
:-)


Thomas

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