initial commit
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Mauro Torrez
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<title>ALE User Manual: EPPM Files</title>
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<style type="text/css">
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TABLE.ba { max-width: 678; text-align: center; padding-bottom: 15; padding-top: 5}
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P {max-width: none; padding-right: 300; clear: left}
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BLOCKQUOTE {padding-right: 400 }
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LI {max-width: 640; clear: left}
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P.footer {max-width: none; width: auto; padding-left: 0}
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P.header {max-width: none; width: auto; padding-left: 0}
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HR.main {max-width: 640; clear: left; padding-left: 0; margin-left: 0}
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HR.footer {clear: both}
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</style>
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</head>
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<body>
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||||
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||||
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||||
|
||||
|
||||
<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>EPPM Files</h1>
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<p>EPPM is an extension to the PPM file format that allows specification of
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metadata. The header of an EPPM file conforms to the following template:
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||||
|
||||
<pre>
|
||||
P6#E
|
||||
# Tag1: Value
|
||||
# Tag2: Value
|
||||
# Tag3: Value
|
||||
# .
|
||||
# .
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||||
# .
|
||||
Width Height Maxval
|
||||
Data
|
||||
</pre>
|
||||
|
||||
<p>Tags recognized by ALE are outlined below.
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||||
|
||||
<h2>Black level</h2>
|
||||
|
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<P>The black level tag specifies a value that should be subtracted from
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||||
all pixels in order to achieve linearity. A modified version of dcraw (<a
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href="/darcs/dcraw">darcs repository</a>) can be used to generate files
|
||||
containing this tag.
|
||||
|
||||
<pre>
|
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# Black-level: <value>
|
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</pre>
|
||||
|
||||
<h2>Exposure tags</h2>
|
||||
|
||||
<p>Exposure tags can be used for determining tonal registration through
|
||||
specification of shutter speed, aperture, and ISO sensitivity (or gain).
|
||||
|
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<pre>
|
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# Shutter: <value>
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# Shutter: 1/<value>
|
||||
# Aperture: <f-number>
|
||||
# ISO: <value>
|
||||
# Gain: <value>
|
||||
</pre>
|
||||
|
||||
|
||||
|
||||
|
||||
<br>
|
||||
<hr>
|
||||
<i>Copyright 2003, 2004 <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.
|
||||
|
||||
|
||||
</body>
|
||||
</html>
|
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@@ -0,0 +1,177 @@
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
|
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<head>
|
||||
<title>ALE User Manual: Rendering Chains</title>
|
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|
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<style type="text/css">
|
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TABLE.ba { max-width: 678; text-align: center; padding-bottom: 15; padding-top: 5}
|
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TABLE.inline { padding-right: 300; clear: left}
|
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TD.text_table {padding-left: 2; padding-right: 2; border-width: 1}
|
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H2 {clear: left}
|
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P {max-width: none; padding-right: 300; clear: left}
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BLOCKQUOTE {padding-right: 400 }
|
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LI {max-width: 640; clear: left}
|
||||
P.footer {max-width: none; width: auto; padding-left: 0}
|
||||
P.header {max-width: none; width: auto; padding-left: 0}
|
||||
HR.main {max-width: 640; clear: left; padding-left: 0; margin-left: 0}
|
||||
HR.footer {clear: both}
|
||||
</style>
|
||||
</head><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>ALE Rendering Chains</h1>
|
||||
|
||||
<p>The ALE incremental renderer is configured using rendering chains. Rendering chains are
|
||||
constructed hierarchically from: invariants, SSFEs (scaled sampling filters
|
||||
with exclusion), SSFs (scaled sampling filters), and sampling filters. Each of
|
||||
these components is described in a section below. Defaults are outlined in the
|
||||
final section.
|
||||
|
||||
<h2>Chains</h2>
|
||||
|
||||
<p>The chain is the top level of the rendering chain hierarchy, and is composed of a
|
||||
sequence of invariants. Syntactically, a chain is specified as a number of
|
||||
invariants separated by commas:
|
||||
|
||||
<blockquote>
|
||||
<code>invariant<sub>1</sub>,invariant<sub>2</sub>,invariant<sub>3</sub>,...,invariant<sub>n</sub></code>
|
||||
</blockquote>
|
||||
|
||||
<p>Each rendered pixel is assigned a value at the first invariant whose weight
|
||||
exceeds the weight threshold, or otherwise at the last invariant in the sequence.
|
||||
|
||||
<h3>Chain Options</h3>
|
||||
|
||||
<pre>
|
||||
--wt <w> Set weight threshold for defined pixels [default is 0.8 in v0.8.0; 0.1 in v0.8.1 and later]
|
||||
--dchain <g> Use chain <g> to render the default output.
|
||||
--ochain <g> <o> Use chain <g> to render output file <o>.
|
||||
--achain <g> Use chain <g> to render the alignment reference image.
|
||||
--3d-chain <g> Use chain <g> by default to render 3d output. [0.8.4 and later]
|
||||
|
||||
</pre>
|
||||
|
||||
<h3>Chain Examples</h3>
|
||||
|
||||
<pre>
|
||||
triangle:2 ALE 0.6.0 merging (roughly)
|
||||
fine:box:1 Drizzling (roughly)
|
||||
fine:sinc*lanc:8 High-frequency preservation
|
||||
last:nex:sinc*lanc:8 Useful for video stabilization
|
||||
fine:box:1,triangle:2 Multi-resolution rendering
|
||||
fine:sinc*lanc:8,sinc*lanc:8 Multi-resolution rendering
|
||||
</pre>
|
||||
|
||||
<h2>Invariants</h2>
|
||||
|
||||
<p>Invariants determine whether the rendered pixel value should be taken from a
|
||||
single frame, or from an average of all frames. If from a single frame, it can
|
||||
be the first, last, minimal, or maximal pixel value. Averages include mean
|
||||
and, in versions 0.8.1 and later, the median. By default, the mean is used.
|
||||
(Note that using the median value may require allocation of a quantity of
|
||||
memory linear in the number of frames.) The syntax is as follows:
|
||||
|
||||
<blockquote>
|
||||
<table>
|
||||
<tr><th align=left>Syntax</th><th><pre> </pre></th><th align=left>Description</th></tr>
|
||||
<tr><td>avg:<SSFE><td><td>Mean value
|
||||
<tr><td>median:<SSFE><td><td>Median value [0.8.1 and later]
|
||||
<tr><td>max:<SSFE><td><td>Maximum value
|
||||
<tr><td>min:<SSFE><td><td>Minimum value
|
||||
<tr><td>first:<SSFE><td><td>First value
|
||||
<tr><td>last:<SSFE><td><td>Last value
|
||||
<tr><td><SSFE><td><td>Same as avg:<SSFE>
|
||||
</table>
|
||||
</blockquote>
|
||||
|
||||
<h2>Scaled Sampling Filter with Exclusion (SSFE)</h2>
|
||||
|
||||
<p>SSFEs qualify SSFs, indicating whether exclusion regions should be honored.
|
||||
|
||||
<blockquote>
|
||||
<table>
|
||||
<tr><th align=left>Syntax</th><th><pre> </pre></th><th align=left>Description</th></tr>
|
||||
<tr><td>ex:<SSF><td><td>Honor exclusion regions
|
||||
<tr><td>nex:<SSF><td><td>Don't honor exclusion regions
|
||||
<tr><td><SSF><td><td>Same as ex:<SSF>
|
||||
</table>
|
||||
</blockquote>
|
||||
|
||||
<h2>Scaled Sampling Filter (SSF)</h2>
|
||||
|
||||
<p>SSFs indicate whether filtering should occur at the resolution of the output
|
||||
image, or at the minimum of input and output image resolutions. The former prevents loss
|
||||
of details; the latter prevents aliasing.
|
||||
|
||||
<blockquote>
|
||||
<table>
|
||||
<tr><th align=left>Syntax</th><th><pre> </pre></th><th align=left>Description</th></tr>
|
||||
<tr><td>fine:<SF><td><td>Filter at full output image resolution
|
||||
<tr><td>coarse:<SF><td><td>Filter at minimum resolution
|
||||
<tr><td><SF><td><td>Same as coarse:<SF>
|
||||
</table>
|
||||
</blockquote>
|
||||
|
||||
<h3>SSF Options</h3>
|
||||
<pre>
|
||||
--afilter <s> Use SSF <s> to interpolate points in alignment.
|
||||
</pre>
|
||||
|
||||
<h2>Sampling Filter (SF)</h2>
|
||||
|
||||
<p>SFs are used to limit bandwidth. Primitive functions and pointwise multiplication of these
|
||||
functions (windowing) are available.
|
||||
|
||||
<blockquote>
|
||||
<table>
|
||||
<tr><th align=left>Syntax</th><th><pre> </pre></th><th align=left>Description</th></tr>
|
||||
<tr><td>sinc<td><td>Sinc filter: (sin πx) / (πx)</td>
|
||||
<tr><td>lanc:<x><td><td>Lanczos, diameter x.
|
||||
<tr><td>triangle:<x><td><td>Triangle, diameter x.
|
||||
<tr><td>box:<x><td><td>Box, diameter x.
|
||||
<tr><td>zero<td><td>Zero function
|
||||
<tr><td><f>*<f><td><td>Pointwise multiplication (windowing)
|
||||
</table>
|
||||
</blockquote>
|
||||
|
||||
<h2>Defaults</h2>
|
||||
|
||||
<p>ALE defaults are as follows:</p>
|
||||
|
||||
<pre>
|
||||
dchain Varies by <a href="../../defaults/">default setting</a>
|
||||
achain Varies by <a href="../../defaults/">default setting</a>
|
||||
afilter internal (approximates triangle:2)
|
||||
</pre>
|
||||
|
||||
|
||||
<br>
|
||||
<hr>
|
||||
<i>Copyright 2003, 2004 <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.
|
||||
|
||||
|
||||
</body>
|
||||
</html>
|
||||
@@ -0,0 +1,216 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
<html>
|
||||
<head>
|
||||
<title>ALE User Manual: Rendering</title>
|
||||
<style type="text/css">
|
||||
TABLE.ba { max-width: 678; text-align: center; padding-bottom: 15; padding-top: 5}
|
||||
TABLE.inline { padding-right: 300; clear: left}
|
||||
TD.text_table {padding-left: 2; padding-right: 2; border-width: 1}
|
||||
H2 {clear: left}
|
||||
P {max-width: none; padding-right: 300; clear: left}
|
||||
BLOCKQUOTE {padding-right: 400 }
|
||||
LI {max-width: 640; clear: left}
|
||||
P.footer {max-width: none; width: auto; padding-left: 0}
|
||||
P.header {max-width: none; width: auto; padding-left: 0}
|
||||
HR.main {max-width: 640; clear: left; padding-left: 0; margin-left: 0}
|
||||
HR.footer {clear: both}
|
||||
</style>
|
||||
|
||||
</head>
|
||||
<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>ALE Rendering</h1>
|
||||
|
||||
<p>Rendering determines how an output image is constructed from a series of
|
||||
aligned input frames, and occurs in two stages: incremental rendering and
|
||||
Irani-Peleg rendering. Additional rendering options include exposure
|
||||
registration, certainty-weighted rendering, spatial extension, range extension,
|
||||
scaling, and bayer pattern specification. Experimental options for video
|
||||
stream processing are also available.
|
||||
|
||||
<h2>Incremental Rendering</h2>
|
||||
|
||||
<p>The incremental renderer uses configurable <a href="chains/">rendering
|
||||
chains</a> to determine the output image. It can increase resolution and
|
||||
reduce aliasing, but it cannot reduce blur.
|
||||
|
||||
<h2>Irani-Peleg Rendering</h2>
|
||||
|
||||
<p>The Irani-Peleg renderer uses configurable <a href="psf/">point-spread
|
||||
functions</a> to model blur, which is then reduced by an iterative
|
||||
backprojection technique. (For iteration defaults, see the <a
|
||||
href="../defaults/"> default settings</a> page.) In versions 0.8.1 and
|
||||
later, using the median correction value can be specified. By default,
|
||||
the mean correction value is used.
|
||||
|
||||
<pre>
|
||||
--ips <i> Run <i> iterations.
|
||||
--ip-mean Use the mean correction [default] [0.8.1 and later]
|
||||
--ip-median Use the median correction [0.8.1 and later]
|
||||
</pre>
|
||||
|
||||
<h2>Exposure Registration</h2>
|
||||
|
||||
<p>By default, ALE adjusts an exposure model to minimize differences in tone
|
||||
between frames. The option <code>--exp-noregister</code> indicates that
|
||||
exposure should be assumed uniform across all frames. In this case, no
|
||||
adjustment is performed. The option <code>--exp-meta-only</code> indicates
|
||||
that only exposure information included in the image files should be used for
|
||||
registration. Currently, <a href="EPPM/">EPPM</a> is the only type of exposure
|
||||
metadata supported by this option.</p>
|
||||
|
||||
<pre>
|
||||
--exp-register Register exposure between frames. [default]
|
||||
--exp-noregister Assume uniform exposure across all frames.
|
||||
--exp-meta-only Use only image metadata for registering exposure.
|
||||
</pre>
|
||||
|
||||
<h2>Color Adjustment [0.8.1 and later]</h2>
|
||||
|
||||
<p>To adjust the color of the output image (e.g., for white balance) in
|
||||
versions 0.8.1 and later, the --exp-mult= option can be used.</p>
|
||||
|
||||
<pre>
|
||||
--exp-mult=c,r,b Adjust all channels by <c>, red by <r>, and blue by <b>. [0.8.1 and later]
|
||||
</pre>
|
||||
|
||||
<h2>Certainty-weighted Rendering</h2>
|
||||
|
||||
<p>The exposure model in ALE includes an associated certainty function, which
|
||||
quantifies the reliability of sensor measurements. By default, this function
|
||||
is raised to the zeroth power, to obtain uniform certainty for all measurements.
|
||||
To specify a different certainty exponent, the option <code>--cx</code> can be
|
||||
used. This option is best used in combination with <code>--exp-extend</code>
|
||||
(see below) and <code>--ips</code>. For defaults, see the <a href="../defaults/">
|
||||
default settings</a> page.
|
||||
|
||||
<pre>
|
||||
--cx <x> Render with certainty exponent <x>
|
||||
--no-cx Render with uniform certainty.
|
||||
</pre>
|
||||
|
||||
<h2>Scale factor</h2>
|
||||
|
||||
<p>Rendering with a larger scale factor results in image output of the specified
|
||||
larger scale. Larger scales can improve alignment precision and output image
|
||||
quality, but can also increase alignment and rendering times.
|
||||
|
||||
<pre>
|
||||
--scale=x Scale images by the factor x, where x > 0. (1 is default)
|
||||
</pre>
|
||||
|
||||
<h2>Image extents</h2>
|
||||
|
||||
<p>The --extend option records pixel data that falls outside of the region of the
|
||||
first frame in the sequence. This can be useful for providing additional
|
||||
alignment constraints or creating panoramic image mosaics. (For mosaics, see
|
||||
also the description of the --follow option in the <a
|
||||
href="../alignment">alignment</a> section.)
|
||||
|
||||
<pre>
|
||||
--extend Increase image extents to accommodate all pixel data.
|
||||
--no-extend Don't increase extents; crop to original frame. [default]
|
||||
</pre>
|
||||
|
||||
<h2>Exposure extents</h2>
|
||||
|
||||
<p>By default, ALE restricts the output range to that of the original frame.
|
||||
To adjust the output range to accommodate the ranges of all input frames,
|
||||
specify <code>--exp-extend</code>. For defaults, see the <a href="../defaults/">
|
||||
default settings</a> page.
|
||||
|
||||
<pre>
|
||||
--exp-extend Extend range to include all calculated values.
|
||||
--exp-noextend Restrict to the original frame's range.
|
||||
</pre>
|
||||
|
||||
<h2>Bayer pattern specification</h2>
|
||||
|
||||
<p>Many cameras sample only one color channel per output pixel. To ignore the
|
||||
other channels, a bayer pattern can be specified.
|
||||
|
||||
<pre>
|
||||
--bayer <b> Set the bayer pattern to <b>, one of:
|
||||
(clockwise from top left pixel)
|
||||
rgbg Red-green-blue-green
|
||||
gbgr Green-blue-green-red
|
||||
grgb Green-red-green-blue
|
||||
bgrg Blue-green-red-green
|
||||
none RGB-RGB-RGB-RGB
|
||||
Default is none or device-specific.
|
||||
</pre>
|
||||
|
||||
<h2>Video stream processing (Experimental)</h2>
|
||||
|
||||
<p>If a sequence of frames represents a video stream, then, in addition to
|
||||
producing a single output image, ALE can also produce one or more sequences of
|
||||
processed frames, corresponding to one or more occurrences of the
|
||||
<code>--visp</code> option. This option has its own associated scaling option,
|
||||
as well as an option to show excluded regions as dimmed wherever possible.</p>
|
||||
|
||||
<pre>
|
||||
--visp <args> Process a video sequence.
|
||||
<args> are:
|
||||
<chain> <stabilization-type> <prefix> <suffix>
|
||||
<chain> is an incremental rendering chain.
|
||||
<stabilization-type> is one of:
|
||||
ma:<x> Moving average over 2*<x> + 1 frames
|
||||
sf:<x> Stabilize to single frame number <x>
|
||||
identity Same as ma:0
|
||||
<prefix> is an output file prefix
|
||||
<suffix> is an output file suffix
|
||||
--visp-scale=<x> Use scale <x> for VISP output. (default is 1.0)
|
||||
--exshow For single-invariant chains, show --ex regions dimmed.
|
||||
</pre>
|
||||
|
||||
<h3>Video stream processing example</h3>
|
||||
|
||||
<p>To mimic the behavior of repeated applications of the 0.6.0
|
||||
<code>--replace</code> option over a sequence of frames, the following
|
||||
<code>--visp</code> option could be used.
|
||||
|
||||
<pre>
|
||||
--visp last:nex:triangle:2 sf:0 frame .jpg
|
||||
</pre>
|
||||
|
||||
<p>For better filtering, the following option could be used instead:
|
||||
|
||||
<pre>
|
||||
--visp last:nex:sinc*lanc:6 sf:0 frame .jpg
|
||||
</pre>
|
||||
|
||||
<br>
|
||||
<hr>
|
||||
<i>Copyright 2003, 2004 <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.
|
||||
|
||||
|
||||
</body>
|
||||
</html>
|
||||
@@ -0,0 +1,91 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
<html>
|
||||
<head>
|
||||
<title>ALE User Manual: Point Spread Functions</title>
|
||||
|
||||
<style type="text/css">
|
||||
TABLE.ba { max-width: 678; text-align: center; padding-bottom: 15; padding-top: 5}
|
||||
TABLE.inline { padding-right: 300; clear: left}
|
||||
TD.text_table {padding-left: 2; padding-right: 2; border-width: 1}
|
||||
H2 {clear: left}
|
||||
P {max-width: none; padding-right: 300; clear: left}
|
||||
BLOCKQUOTE {padding-right: 400 }
|
||||
LI {max-width: 640; clear: left}
|
||||
P.footer {max-width: none; width: auto; padding-left: 0}
|
||||
P.header {max-width: none; width: auto; padding-left: 0}
|
||||
HR.main {max-width: 640; clear: left; padding-left: 0; margin-left: 0}
|
||||
HR.footer {clear: both}
|
||||
</style>
|
||||
</head><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>ALE Point Spread Functions</h1>
|
||||
|
||||
<p>The ALE Irani-Peleg renderer uses a point-spread function to model the optical
|
||||
and electronic properties of the capture device used. The PSF can be specified
|
||||
in terms of one linear and one non-linear component.
|
||||
|
||||
<h3>PSF specification</h3>
|
||||
|
||||
<p>The PSF can be explicitly specified by using one or both of the psf options.
|
||||
|
||||
<pre>
|
||||
--lpsf <p> Set linear colorspace point-spread function to <p>
|
||||
--nlpsf <p> Set non-linear colorspace point-spread function to <p>
|
||||
</pre>
|
||||
|
||||
Available explicit point-spread functions are as follows:
|
||||
|
||||
<pre>
|
||||
box=<d> Set the PSF to a box filter with diameter <d>.
|
||||
circle=<d> Set the PSF to a circular filter with diameter <d>.
|
||||
stdin Specify a custom filter at runtime.
|
||||
stdin_vg stdin with vertically-oriented gaps after every 8th pixel.
|
||||
<p>+<p> Summation of two functions
|
||||
<p>^<p> Convolution of two functions.
|
||||
<n>*<p> Multiplication by a scalar <n>.
|
||||
</pre>
|
||||
|
||||
If a device is known to ALE, then its PSF can be implicitly set with the
|
||||
<code>--device</code> option. (See the <a href="../../device/">device</a> page
|
||||
for more information.) If a device is not specified, then the default linear
|
||||
PSF component is <code>box=1</code>. The non-linear PSF component is disabled
|
||||
by default.
|
||||
|
||||
<h3>Determining the PSF</h3>
|
||||
|
||||
<p>The PSF can be approximated based on images of known scenes. The ALE source
|
||||
distribution includes an experimental script that numerically approximates the
|
||||
PSF in this way (<code>d2/render/psf/ale-psf-calibrate</code>). Other, more
|
||||
efficient methods for approximating the PSF are likely possible, however.
|
||||
|
||||
<br>
|
||||
<hr>
|
||||
<i>Copyright 2003, 2004 <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.
|
||||
|
||||
|
||||
</body>
|
||||
</html>
|
||||
Reference in New Issue
Block a user