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<a class="headsubtitle" href="munipack.html">A general astronomical image processing software</a>
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<h1>Kombine</h1>
<p class="abstract">
Multiple frames are composed to a single image.
</p>
<h2>Command</h2>
<code>
munipack kombine [..] files
</code>
<h2>Description</h2>
<p>
Purpose of this routine is to compound images into a deeper exposure,
to increase its dynamic range, to average frames or to create of a mosaics
covering larger area than any single frame.
</p>
<p>
Result image can be scaled to arbitrary size, rotated and shifted. Also
photometric information can be saved on per-image base.
</p>
<p>
The routine provides sub-pixel resolution. The blurring of image due to
convolution is not reduced by the implemented algorithm.
</p>
<h2>Prerequisites</h2>
<p>
Kombine needs astrometry. A regular photometry is necessary
for averaging.
</p>
<h2>Input And Output</h2>
<p>
On input, list of frames meeting the prerequisites.
</p>
<p>
On output, a new FITS frame is created.
</p>
<h2>Averaging</h2>
<p>
Averaging (<samp>--average</samp>) can create clean up average
frames. The averaging can be applied only on already photo-metrically
calibrated frames including PHOTOMETRY extension created by
<a href="man_phcal.html">phcal</a>. The result frame has mean
intensity and background of input frames.
</p>
<h2>Initialisation of parameters</h2>
<p>
The paramaters are inherited from parameters of the first
frame on input, if no corresponding parametr is set by command
line option. The strategy is chosen as the less surprising
way. The output frame looks similary as inputs ones.
</p>
<p>
The live will more easy with the zero rotation
angle (<samp>--angle 0</samp>) and
no reflection (<samp>--reflex no</samp>) of output frames.
</p>
<h2>Parameters</h2>
<h3>Parameters for composition:</h3>
<dl>
<dt><samp>-i, --interpol</samp></dt><dd>interpolation method:
none (<a href="https://en.wikipedia.org/wiki/Image_scaling">nearest
neighborhood</a>),
<a href="https://en.wikipedia.org/wiki/Bilinear_interpolation">bilinear</a>,
<a href="https://en.wikipedia.org/wiki/Bicubic_interpolation">bicubic</a>
(default)</dd>
<dt><samp>--adjust</samp></dt><dd>adjust sky level of individual
exposures</dd>
<dt><samp>--expomask</samp></dt><dd>use exposure mask to normalise
photon rates</dd>
<dt><samp>--average</samp></dt><dd>compute the robust mean
for every single pixel instead of frames summation</dd>
</dl>
<h3>Geometry parameters:</h3>
<dl>
<dt><samp>-p, --projection</samp></dt><dd> projection: none, gnomonic
(default)</dd>
<dt><samp>--rcen, --dcen</samp></dt><dd> centre of projection in
Right Ascension and Declination [deg]</dd>
<dt><samp>--width, --height</samp></dt><dd>dimensions of the output
frames in pixels</dd>
<dt><samp>--xcen, --ycen</samp></dt><dd> centre of projection on chip [pix]
(default: width/2, height/2)</dd>
<dt><samp>--scale</samp></dt><dd>scale [pix/deg]</dd>
<dt><samp>--angle</samp></dt><dd>positional angle [deg]</dd>
<dt><samp>--reflex</samp></dt><dd>[yes|no] setup reflection</dd>
</dl>
<p>See <a href="man_com.html">Common options</a> for input/output filenames.</p>
<h2>Examples</h2>
<p>
Compose images
</p>
<code>
$ munipack kombine images*.fits
</code>
<h2>See Also</h2>
<p>
<a href="kombitut.html">Frame Composition</a>,
<a href="mosaics.html">Mosaics</a>,
<a href="colorimage.html">Frame Colouring</a>,
<a href="http://en.wikipedia.org/wiki/Slip_(clothing)" title="Kombiné is Czech term for slip :)">Slip</a>
<a href="man_com.html">Common options</a>
</p>
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