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<h1>Hugin-2009.4.0 release notes</h1>
<p>Hugin is a panorama stitcher and more.</p>

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as a result most readers are unlikely to have used Hugin before.  i.e. the
audience of this document is somebody who has an idea what a panorama stitcher
might be, has never heard of Hugin, but is interested in discovering cool new
software. -->

<h2>Changes since 2009.2.0</h2>

<p>The last release was barely a month ago, but we have a backlog of new
features ready to go.  So keeping with the intention of tracking development
better with more frequent releases, Hugin now brings you two major new features
as well as the usual bugfixes and incremental improvements:</p>

<h3>Automatic lens calibration</h3>

<p>Hugin is already a great tool for calibrating lenses; by stitching a
panorama Hugin will automatically calculate <em>barrel distortion</em>,
<em>vignetting</em> and <em>angle of view</em> for any lens.  Plus there is
everything a power user might want: different lenses can be calibrated in a
single project, fisheyes and shift lenses pose no problems to the Hugin
<em>optimiser</em>.</p>

<p>However, stitching a panorama is not the only way to calculate lens
parameters; <em>barrel distortion</em> turns straight lines into curves, so
figuring out how to straighten them again is enough to accurately calibrate a
lens - All you need is an object with lots of straight-lines, such as a modern
building, and one or more photographs of it.</p>

<p>This year Tim Nugent was employed by Google Summer of Code to add a new
Hugin tool called <em>calibrate_lens</em>, this takes such photos as input and
produces calibrated parameters as output.  There isn't yet a graphical
interface, and the command-line tool still requires work to produce output
compatible with Hugin, but this release provides a base to build future
tools.</p>

<h3>Control point cleaning</h3>

<p>Hugin aligns photos using a system of <em>control points</em>; these are
features from the scene that appear in each pair of overlapping photos.
Normally just a handful of features are needed to get a good result, but they
do need to be identified - This can be done either by picking them in the Hugin
<em>Control Points tab</em> or by using one of the automatic <em>control point
creator</em> plugins such as <em>autopano-sift-C</em> or
<em>pan-o-matic</em>.</p>

<p>These <em>Control point creators</em> are incredibly convenient, but still
make mistakes that are obvious to the human eye.  Hugin now filters
automatically generated points to remove those that are statistically
improbable.  The same filter can be used to 'clean' an existing project on the
<em>Images tab</em>, and is available as a new scriptable command-line tool
called <em>cpclean</em>.</p>

<h3>Languages</h3>

<p>The Hugin application is translated into twenty languages, most of these
translations have been updated for this release.</p>

<h3>Other improvements</h3>

<p>This release also has the usual incremental improvements: building on
Windows, Linux and OS X is now easier, some crashes in obscure situations have
been fixed, more useful photo EXIF metadata is shown in the <em>Images
tab</em>, the manual has been updated to document current features and now
displays in your default system web-browser, a bug where upside down crop
rectangles confused the stitcher is fixed, and an annoyance where control point
settings were not persistent between sessions is gone.</p>

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<h2>Control point generators</h2>
<p>Hugin doesn't yet ship with a 'Patent Free' control point
generator. So you either need to pick control points manually - Not
as difficult as it sounds - or install and configure one of the
following control-point generators as 'plug-ins':</p>
<ul>
<li>autopano-sift-C</li>
<li>panomatic</li>
<li>match-n-shift</li>
<li>Autopano-SIFT</li>
<li>Autopano freeware version</li>
</ul>
<h2>Upgrading</h2>
<p>Upgrading from previous versions of Hugin should be seamless. If
you do have problems with old settings, these can be reset in the
Preferences by clicking 'Load defaults'.</p>

<p>For users compiling from source: note that the minimum version of
<em>wxWidgets</em> supported is now 2.7.0, libpano13 needs to be at least
2.9.14, and that Hugin now requires <em>GLEW</em> the OpenGL Extension Wrangler
Library, <em>freeglut</em> the OpenGL utility toolkit, and <em>libGLU</em> the
OpenGL utility library.</p>

<p>Support for the legacy libpano12 library has been discontinued.</p>

<p>See the README and INSTALL_cmake files for more
information.</p>
<p>Thanks to all the contributors to this release and members of
the hugin-ptx mailing list, too many to mention here.</p>
<hr />
<p>Hugin can be found at <a
href="http://hugin.sourceforge.net/">http://hugin.sourceforge.net/</a>.</p>
<p>Hugin sourcecode can be downloaded from sourceforge: <a href="http://sourceforge.net/projects/hugin/files/hugin/">http://sourceforge.net/projects/hugin/files/hugin/</a>.</p>

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