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?

2011-07-10 Thread Gareth Jones
Hi,

On 11 July 2011 02:14, EwingKang 可愛滴蜥蜴 f039281...@yahoo.com.tw 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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