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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<head>
<title>ALE User Manual: Control Points</title>
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<body>
<table align=right valign=top width=160>
<td valign=top height=600 width=160>
<a href="http://auricle.dyndns.org/ALE/">
<big>ALE</big>
<br>
Image Processing Software
<br>
<br>
<small>Deblurring, Anti-aliasing, and Superresolution.</small></a>
<br><br>
<big>
Local Operation
</big>
<hr>
localhost<br>
2684415918<br>
</table>
<p><b>[ <a href="../">Up</a> ]</b></p>
<h1>Control Points [0.8.1 and later]</h1>
<p>Control points are used for 2D and 3D alignment, and to constrain 3D scene
models. Control point data is loaded from a control point file. Scripts to
generate and manipulate control point files are included in the
<code>scripts</code> directory of the source distribution; the file
specification is outlined in the final section below.
<h2>Loading a Control Point File</h2>
The --cpf-load= option is used to load data from a control point file.
<pre>
--cpf-load=&lt;f> Load control point data from file &lt;f> [0.8.1 and later]
</pre>
<h2>Control Point File Format (version 0)</h2>
The version 0 control point file format consists of a version command followed
by a sequence of control points, with one control point per line of the file.
<pre>
V 0
<i>Control Point 1</i>
<i>Control Point 2</i>
<i>Control Point 3</i>
.
.
.
</pre>
<p>Control points can be one of three types:</p>
<h3>Type A control points</h3>
Type A control points specify a sequence of 2D points, one for each frame,
where each point is specified as a pair of floating point numbers. If there is
no data for a frame, then "nan" should be specified. E.g.:
<pre>
A 20 30 nan nan 10 10 10 15
A 23 22 25 25 nan nan nan nan
</pre>
<h3>Type B control points</h3>
Type B control points specify a 3D coordinate. E.g.:
<pre>
B 10 30 -400
B 10 15 -425
</pre>
<h3>Type C control points</h3>
Type C control points specify both 2D and 3D data. There is a single 3D point
specified, as well as one 2D point for each frame. The 3D point appears at the
end of the line. E.g.:
<pre>
C 20 30 nan nan 10 10 10 15 10 30 -400
C 23 22 25 25 nan nan nan nan 10 15 -425
</pre>
<br>
<hr>
<i>Copyright 2005 <a href="mailto:dhilvert@auricle.dyndns.org">David Hilvert</a></i>
<p>Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.
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