Exif Information. Automatic Computing

[villa]

Hi all

I've been evaluating several programs for mosaic generation, one of
them is free (hugin) while the other is commercial (Autopano Pro).
Both are very good but the Autopano Pro has a feature that I find very
interesting but I don't really know how it works.

When you upload photos to "hugin" if the photos don't have EXIF
information you need to include the hfov and the focal length to
continue the process, but the Autopano Pro if the photos don't have
EXIF information it seems that somehow calculates the hfov and the
focal length.

This information autopano computes is provided subsequently to hugin
and this program works perfectly, therefore the values are correct.

My question is if there a technique or algorithm that allows to obtain
this information if not included in the EXIF

Best regards.

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[Nicolas Pelletier-4]

If the information is not in the EXIF, then it is not provided to the software, and it has to "guess" or optimize to what seems the best value. Typical algorithms are very good at finding those values (both Hugin and Autopano according to your results).

I've not played with autopano, but I can tell that hugin can figure out what lens you used (Field of View and focal length). The way it will do so is by starting with a value that may not be exact, and converge to the best value it can.

With hugin, you must give it a starting value (even quite imprecise) and it will figure out the values. I remember one time I shot a pano and gave hugin the information from the wrong lens. After optimization, it had changed everything back to what it should. My recommendation, put what you think and let hugin figure out the details!

When you optimize, FOV may not be checked as something that can be changed, so if it does not work, go on the optimizer tab to see if FOV is indeed checked.

nick

On Sun, Oct 25, 2009 at 4:47 AM, villa <fjgarciav@...> wrote:

Hi all

I've been evaluating several programs for mosaic generation, one of
them is free (hugin) while the other is commercial (Autopano Pro).
Both are very good but the Autopano Pro has a feature that I find very
interesting but I don't really know how it works.

When you upload photos to "hugin" if the photos don't have EXIF
information you need to include the hfov and the focal length to
continue the process, but the Autopano Pro if the photos don't have
EXIF information it seems that somehow calculates the hfov and the
focal length.

This information autopano computes is provided subsequently to hugin
and this program works perfectly, therefore the values are correct.

My question is if there a technique or algorithm that allows to obtain
this information if not included in the EXIF

Best regards.

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups "hugin and other free panoramic software" group.
A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ
To post to this group, send email to hugin-ptx@...
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[villa]

Thanks, I'll try your advice.

On 25 oct, 19:40, Nicolas Pelletier <nicolas.pellet...@...>
wrote:

> If the information is not in the EXIF, then it is not provided to the
> software, and it has to "guess" or optimize to what seems the best value.
> Typical algorithms are very good at finding those values (both Hugin and
> Autopano according to your results).
>
> I've not played with autopano, but I can tell that hugin can figure out what
> lens you used (Field of View and focal length). The way it will do so is by
> starting with a value that may not be exact, and converge to the best value
> it can.
>
> With hugin, you must give it a starting value (even quite imprecise) and it
> will figure out the values. I remember one time I shot a pano and gave hugin
> the information from the wrong lens. After optimization, it had changed
> everything back to what it should. My recommendation, put what you think and
> let hugin figure out the details!
>
> When you optimize, FOV may not be checked as something that can be changed,
> so if it does not work, go on the optimizer tab to see if FOV is indeed
> checked.
>
> nick
>
> On Sun, Oct 25, 2009 at 4:47 AM, villa <fjgarc...@...> wrote:
>
> > Hi all
>
> > I've been evaluating several programs for mosaic generation, one of
> > them is free (hugin) while the other is commercial (Autopano Pro).
> > Both are very good but the Autopano Pro has a feature that I find very
> > interesting but I don't really know how it works.
>
> > When you upload photos to "hugin" if the photos don't have EXIF
> > information you need to include the hfov and the focal length to
> > continue the process, but the Autopano Pro if the photos don't have
> > EXIF information it seems that somehow calculates the hfov and the
> > focal length.
>
> > This information autopano computes is provided subsequently to hugin
> > and this program works perfectly, therefore the values are correct.
>
> > My question is if there a technique or algorithm that allows to obtain
> > this information if not included in the EXIF
>
> > Best regards.
>
>

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