Re: [hugin-ptx] Re: Translators requested for Hugin 2012.0 release

2012-08-08 Thread Gareth Jones
>> I'm just working on the last few strings (using the new changeset) and
>> stumbled over "Removes all control points, which are in masks". Do we
>> need a comma here,
>
> Don't know exactly. Maybe a native speaker can help.

Ah, I thought I suggested that in my first round of typos.  Yes, the
comma should go away.  I'm torn whether it should be "which" or "that"
though, but leaning toward "that".

Gareth

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Re: [hugin-ptx] Re: Translators requested for Hugin 2012.0 release

2012-08-07 Thread Gareth Jones
> Okay, there were no objections. So I committed the fixes.

I'm afraid I missed a few minor ones:
https://bugs.launchpad.net/hugin/+bug/1034122.

I've also tweaked en_GB with a few I missed:
https://bugs.launchpad.net/hugin/+bug/1034120.

Gareth

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Re: [hugin-ptx] Re: Translators requested for Hugin 2012.0 release

2012-08-04 Thread Gareth Jones
> I'll get to work on this over the next couple of days.

Okay, en_GB translations are at
https://bugs.launchpad.net/hugin/+bug/1032993, and my suggested typos
etc. are at https://bugs.launchpad.net/hugin/+bug/1032991.

Gareth

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Re: [hugin-ptx] Re: Translators requested for Hugin 2012.0 release

2012-08-02 Thread Gareth Jones
> en_GB.po
> 52 translated messages, 4 fuzzy translations, 1277 untranslated
> messages.

I'll get to work on this over the next couple of days.  Not that en_GB
is ever a particularly major job...  I expect I'll report a few typos
or inconsistencies too as usual.

Gareth

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Re: 回覆:Re: [hugin-ptx] Failed exposure fusion?

2011-07-11 Thread Gareth Jones
> If the three images have some slight geometric
> difference,should it be set as same stack?

Short answer: Just keep them separate for a single stack.

Long answer: I don't think there's any advantage in using the same
stack number unless you're blending a panorama of *multiple* stacks -
then it helps with masking if you need it.

You can set them as the same stack and uncheck the "link" checkbox for
the position parameters, but it's easier just to leave them in
separate stacks.  Separate stacks allow you to use the X,Y,Z position
parameters too, which I don't think can be unlinked within a stack.

Gareth

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Re: 回覆:Re: [hugin-ptx] Failed exposure fusion?

2011-07-10 Thread Gareth Jones
Hi,

On 11 July 2011 02:14, EwingKang 可愛滴蜥蜴  wrote:
> So you mean that hugin can't create an exposure fusion image that all of the
> photo were taken only in one perspective?

I regularly use Hugin for just that.  It may not be the best tool but
it works for me.  Some tips:

- Use rectilinear for the output projection to keep a rectangular image.

- For the geometric alignment (if needed), use the align_image_stack
control point detector.  Anchor one image completely.  Optimize only
image positions, not lens distortions.

- For the photometic alignment, only optimize response, or nothing at
all.  Certainly not vignetting or exposure.

Gareth

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Re: [hugin-ptx] auto straighten changes yaw by 180 degrees

2011-03-14 Thread Gareth Jones
> i'm noticing that the "straighten" feature will sometimes not change the
> pitch/roll of the pano, but it will change the yaw by 180º.

Is this with a 360deg panorama?  I've not noticed it with straighten,
but centring often flips the yaw by 180deg with 360deg panoramas.
(Yes I have tried to centre a 360, I'm that smart...)

Gareth

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Re: [hugin-ptx] Stitching and enfusing a handheld panorama with several exposures

2011-03-01 Thread Gareth Jones
Hi,

> - first, on my machine (developer preview of Hugin built on Jan 23rd
> and the control point detection settings you set me) the distance
> column in the control points table always contains distances (some
> numbers >1) while, after fine tuning, it is supposed to contain
> correlation coefficients (should always be <1).

After the fine-tuning, the numbers should always be correlation
coefficients.  Sometimes they are indeed a little >1.  (I don't know
why, my memory of how such things work mathematically is a bit faded
these days!)  Pixel distances early on would be much >>1 though.

> How do you select
> points by correlation in steps 8 and by distance in step 9, since the
> distance column should only contain one of those two? Can you switch
> between the two?

Pressing "select by distance" (and using negative threshold values)
should just do the right thing after fine-tuning.  I don't know of any
way of switching between correlation and distance other than to rerun
the fine-tuner or optimizer.

> - you say that you first do a position only optimisation, then remove
> problematic points and then do further optimisations. These are still
> position only right?

I normally optimize the positions (incremental from anchor); then
straighten and centre in the preview; then calculate optimal size in
the stitcher tab; then re-optimize the positions; then add view (for
360deg or multiple lenses); then barrel b; then d, e, a and c; and
finally X, Y and Z (narrow scenes with no/implicit stacks).  I remove
obviously wrong points (mismatched features, or >50 pixels) as soon as
they become visible in the preview, but I don't start trimming the
smaller control point distances due to parallax until the end,
repeating the final optimization till I'm happy with it.  This is just
habit; you can probably go straight from the position optimization to
the final optimization without the intermediate runs, and repeat it
whilst trimming control points.

> - it seems the align button in the assistant tab does more than
> position optimize + photometric optimization. Indeed, If I create the
> control points, then optimize them in the Optimizer tab and finally do
> photometric optimization in the exposure tab, the assistant still says
> "Images or control points have changed, new alignment is needed". What
> is missing? What else does it do?

I don't know what else the assistant does, but I assume (hope!) that
all its functionality is available in the other tabs.  The "...new
alignment is needed" message appears for me too after photometric
optimization, but since I've already aligned everything at that point
and I can't see how photometric alignment can alter the geometric
alignment, I just regard it as a quirk of the way the assistant tracks
changes to the image metadata.

Maybe someone else here can enlighten us about that?

> - when performing photometric optimisation, I need to use HDR, fixed
> exposure to avoid having hugin correct the under and over exposed
> images, right?

Yes, leave the exposure for Enfuse/hdr_merge to deal with.

> Thanks in advance for the help.

No problem, I just hope it is help - I don't know if my way is the best way...

Gareth

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Re: [hugin-ptx] Stitching and enfusing a handheld panorama with several exposures

2011-02-24 Thread Gareth Jones
Hi,

Markku Kolkka wrote:
> Don't use stacks with hand-held images. Hugin believes that
> images in a stack are pre-aligned perfectly.

Explicit stacks do help with some other things though
(cpfind+align_images, whole-stack masking etc.)

Just remember to uncheck the "link" checkbox in the images tab for all
the stacks (it's in the image orientation section).  This allows
images to be aligned within a stack, at least in angular space.
(There seems to be a bug with XYZ alignment not being properly
unlinked even though the optimizer assumes it is, but I haven't
investigated that yet to report it, and XYZ isn't an issue for wide
panoramas anyway.  XYZ does help a little for parallax on flat-ish
ground with less than 180deg though, so in that case I unstack the
images after creating control points.)

My method (working hand-held) is to take the photos with the camera
settings basically as you do.  Then in Hugin 2010.04:
1) Set up *unlinked* stacks.
2) Mask moving people etc.
3) Temporarily mask out any obviously parallaxed foreground.
(Assuming that you prefer the background to be properly aligned.)
4) Run "cpfind (multirow/stacked)" on all.  As far as I can tell this
uses align_image_stack within stacks and normal cpfind between stacks.
 Cpfind seems to be aware of the masks, but align_image_stack isn't -
deal with that in step 5.

I then remove bad control points:
5) Edit->Remove control points in masks - this eliminates the masked
out foreground and moving objects.  Remove the temporary foreground
masks now.
6) Run Celeste if there are clouds.
7) "Clean control points" button to remove outliers.
8) Edit->Fine tune, then remove points with <0.8 correlation.  <0.9
works well if you only use align_image_stack, but cpfind creates lots
of points with lower correlations for me.
9) During optimizing, I remove control points in stages between
rerunning the optimizer, based on their mismatch distance (e.g. >10,
>5, >2, >1).  Sometimes I need to manually add points between stacks.
After the initial positions-only optimization and straightening and
centring the preview, I use "calculate optimal size" in the Stitcher
tab so that the pixel mismatches are accurate for successive
optimization passes.

For stages 8 and 9 use "View->Control point table" to select and
remove points with low correlation and high pixel mismatch.

Then I mask lens flares etc., do photometric optimization and blending
as described.  If the foreground looks too bad I crop it out.

It's a bit overly complex, but for hand-held panoramas taken in the
wind at the top of a mountain, computers just aren't yet clever enough
to automate the process fully...  I too welcome any suggestions of
course, but this method at least is working well for me.

Gareth

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[hugin-ptx] Re: hugin blues

2010-09-24 Thread Gareth
Carl,

I've just checked the last Hugin image I installed, which was hugin-
mac-2010-1.0.0 from early June. I know from the list that things have
changed since then so perhaps I should give Hugin another try, when I
have some spare moments.


On Sep 24, 1:05 pm, Yuval Levy  wrote:
> On September 24, 2010 05:34:05 am kfj wrote:
>
> > special thanks to Yuval Levy, you have really made an effort to work
> > things out for me so I can take heart, get over my frustration and
> > maybe end up doing something productive.
>
> happy to read my words were helpful to you.  I am sure you will do something
> productive, whether with PTgui, Hugin, or whatever other software you will
> apply your brains to.
>
> > I'm well willing to struggle up
> > the learning curve to get things working. And I'll look into what I
> > can do to make the problems that bug me go away.
>
> You're already on the right path.  Fire up questions to this list, you'll
> often get help and advice from people who have "been there done that".
>
> Even if you're going to "unchartered territories", you'll get help and support
> along the way, as you can witness in your recent thread about building libpano
> on MinGW.
>
> Yuv
>
>  signature.asc
> < 1KViewDownload

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[hugin-ptx] Re: hugin blues

2010-09-24 Thread Gareth
I'd like to add my thoughts here on why I liked Hugin, but decided to
use PTgui.

I've just started with Panorama software, and am looking to integrate
Panos and VR tours into my photography business.
I'm a great advocate of Open source software, and was pleased to find
Hugin, and it's associated programs. I've also a long track recored in
computing before moving to photography as a career, so I was happy to
tackle the challenges of getting Hugin to work
However, after a number of trials, and some success with Hugin, I
bought PTgui. I could get good (perhaps not perfect) results quickly
with PTgui that I couldn't do with Hugin. And my criteria for choosing
the software was getting my knowledge up and the ability to get a
product to market as soon as possible - so the use of commercial
software and consequent timesaving was, for me, the correct decision.

These days I do most of my work on a Mac, having migrated from
windows. I had some difficulty in installing and getting everything to
work on this platform. It wasn't practical for me to use my Windows
desktop to stitch panos but travel with a Macbook when taking the
images. I guess the final thing was actually gathering up to date
information on both program installation and operation - a common
problem with open source.

However, I still gather lots of useful information from this
community, and perhaps will revisit Hugin as a tool when I can easily
install and configure on my Macbook.

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