/usr/share/doc/libcpl-doc/html/group__cpl__detector.html is in libcpl-doc 6.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.8.6"/>
<title>Common Pipeline Library Reference Manual: High-level functions to compute detector features</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
<link href="cpl.css" rel="stylesheet" type="text/css"/>
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td style="padding-left: 0.5em;">
<div id="projectname">Common Pipeline Library Reference Manual
 <span id="projectnumber">6.5</span>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.6 -->
<div id="navrow1" class="tabs">
<ul class="tablist">
<li><a href="index.html"><span>Main Page</span></a></li>
<li><a href="pages.html"><span>Related Pages</span></a></li>
<li><a href="modules.html"><span>Modules</span></a></li>
<li><a href="annotated.html"><span>Classes</span></a></li>
</ul>
</div>
</div><!-- top -->
<div class="header">
<div class="summary">
<a href="#func-members">Functions</a> </div>
<div class="headertitle">
<div class="title">High-level functions to compute detector features</div> </div>
</div><!--header-->
<div class="contents">
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga83fd1a1d48eeeb444d6a1a84c6d5e2de"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__cpl__error.html#ga44b4287e8a7a22122b94c220a1dd9459">cpl_error_code</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__cpl__detector.html#ga83fd1a1d48eeeb444d6a1a84c6d5e2de">cpl_detector_interpolate_rejected</a> (cpl_image *self)</td></tr>
<tr class="memdesc:ga83fd1a1d48eeeb444d6a1a84c6d5e2de"><td class="mdescLeft"> </td><td class="mdescRight">Interpolate any bad pixels in an image and delete the bad pixel map. <a href="#ga83fd1a1d48eeeb444d6a1a84c6d5e2de">More...</a><br/></td></tr>
<tr class="separator:ga83fd1a1d48eeeb444d6a1a84c6d5e2de"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaf1c0a4858464aadaef04d42770db2f7c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__cpl__error.html#ga44b4287e8a7a22122b94c220a1dd9459">cpl_error_code</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__cpl__detector.html#gaf1c0a4858464aadaef04d42770db2f7c">cpl_flux_get_bias_window</a> (const cpl_image *diff, const <a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> *zone_def, <a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> ron_hsize, <a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> ron_nsamp, double *bias, double *error)</td></tr>
<tr class="memdesc:gaf1c0a4858464aadaef04d42770db2f7c"><td class="mdescLeft"> </td><td class="mdescRight">Compute the bias in a rectangle. <a href="#gaf1c0a4858464aadaef04d42770db2f7c">More...</a><br/></td></tr>
<tr class="separator:gaf1c0a4858464aadaef04d42770db2f7c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gad77be43229e187b59bad4cdd766a53d0"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__cpl__error.html#ga44b4287e8a7a22122b94c220a1dd9459">cpl_error_code</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__cpl__detector.html#gad77be43229e187b59bad4cdd766a53d0">cpl_flux_get_noise_ring</a> (const cpl_image *diff, const double *zone_def, <a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> ron_hsize, <a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> ron_nsamp, double *noise, double *error)</td></tr>
<tr class="memdesc:gad77be43229e187b59bad4cdd766a53d0"><td class="mdescLeft"> </td><td class="mdescRight">Compute the readout noise in a ring. <a href="#gad77be43229e187b59bad4cdd766a53d0">More...</a><br/></td></tr>
<tr class="separator:gad77be43229e187b59bad4cdd766a53d0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga74968d3ccbe99f2e4ec868cb931bb87e"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__cpl__error.html#ga44b4287e8a7a22122b94c220a1dd9459">cpl_error_code</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__cpl__detector.html#ga74968d3ccbe99f2e4ec868cb931bb87e">cpl_flux_get_noise_window</a> (const cpl_image *diff, const <a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> *zone_def, <a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> ron_hsize, <a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> ron_nsamp, double *noise, double *error)</td></tr>
<tr class="memdesc:ga74968d3ccbe99f2e4ec868cb931bb87e"><td class="mdescLeft"> </td><td class="mdescRight">Compute the readout noise in a rectangle. <a href="#ga74968d3ccbe99f2e4ec868cb931bb87e">More...</a><br/></td></tr>
<tr class="separator:ga74968d3ccbe99f2e4ec868cb931bb87e"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<dl class="section user"><dt>Synopsis:</dt><dd><div class="fragment"><div class="line"><span class="preprocessor">#include "cpl_detector.h"</span></div>
</div><!-- fragment --> </dd></dl>
<h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="ga83fd1a1d48eeeb444d6a1a84c6d5e2de"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="group__cpl__error.html#ga44b4287e8a7a22122b94c220a1dd9459">cpl_error_code</a> cpl_detector_interpolate_rejected </td>
<td>(</td>
<td class="paramtype">cpl_image * </td>
<td class="paramname"><em>self</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Interpolate any bad pixels in an image and delete the bad pixel map. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">self</td><td>The image to clean </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>The <a class="el" href="group__cpl__error.html#ga49a0c316d52d2afbfd9fd94b95344900" title="Available error codes. ">_cpl_error_code_</a> or CPL_ERROR_NONE</dd></dl>
<p>The value of a bad pixel is interpolated from the good pixels among the 8 nearest. (If all but one of the eight neighboring pixels are bad, the interpolation becomes a nearest neighbor interpolation). For integer images the interpolation in done with floating-point and rounded to the nearest integer.</p>
<p>If there are pixels for which all of the eight neighboring pixels are bad, a subsequent interpolation pass is done, where the already interpolated pixels are included as source for the interpolation.</p>
<p>The interpolation passes are repeated until all bad pixels have been interpolated. In the worst case, all pixels will be interpolated from a single good pixel.</p>
<p>Possible <a class="el" href="group__cpl__error.html#ga49a0c316d52d2afbfd9fd94b95344900" title="Available error codes. ">_cpl_error_code_</a> set in this function:</p>
<ul>
<li>CPL_ERROR_NULL_INPUT if an input pointer is NULL</li>
<li>CPL_ERROR_DATA_NOT_FOUND if all pixels are bad </li>
</ul>
<p>References <a class="el" href="group__cpl__error.html#ga79968a56c1b2ee25b12747ad7e1b3478">cpl_ensure_code</a>, <a class="el" href="group__cpl__error.html#ga724de575c31ddf40f42786306f9dbdcb">cpl_error_get_code()</a>, <a class="el" href="group__cpl__error.html#gga49a0c316d52d2afbfd9fd94b95344900a7907a24014a3a45aebe5ee1842f0c6f3">CPL_ERROR_INVALID_TYPE</a>, <a class="el" href="group__cpl__error.html#gga49a0c316d52d2afbfd9fd94b95344900a0239c1c63e9d21e98e45221a3ad60406">CPL_ERROR_NONE</a>, <a class="el" href="group__cpl__error.html#gga49a0c316d52d2afbfd9fd94b95344900a7b054cf7927d1bd0a9b3693a6715be84">CPL_ERROR_NULL_INPUT</a>, <a class="el" href="group__cpl__image.html#ga035ba167b6776b782e9920335dba5587">cpl_image_accept_all()</a>, <a class="el" href="group__cpl__image.html#gaa199c6fc00ac1d83ed37fb9717e2c4bd">cpl_image_get_bpm_const()</a>, <a class="el" href="group__cpl__image.html#ga0b497875edfee08e540e69c2baea1ab4">cpl_image_get_data()</a>, <a class="el" href="group__cpl__image.html#gab5a6bc059aa1d38c37ab5852b5170e45">cpl_image_get_size_x()</a>, <a class="el" href="group__cpl__image.html#gaf3495f9be1d6892cfed9c5232ccee350">cpl_image_get_size_y()</a>, <a class="el" href="group__cpl__image.html#ga17f97e60794f88e7f06b85cccbecc132">cpl_image_get_type()</a>, <a class="el" href="group__cpl__mask.html#gac9ab11af7ef4ff0b8424141271fd685b">cpl_mask_get_data_const()</a>, <a class="el" href="group__cpl__type.html#gga3f03371e201544e9115b40065e47f086a4923f03f3a673edd344b0d81835ca69e">CPL_TYPE_DOUBLE</a>, <a class="el" href="group__cpl__type.html#gga3f03371e201544e9115b40065e47f086afc7205e8b040bdfdee6011685cfe4345">CPL_TYPE_DOUBLE_COMPLEX</a>, <a class="el" href="group__cpl__type.html#gga3f03371e201544e9115b40065e47f086aa44c37e26b9040a96e3a49b405946942">CPL_TYPE_FLOAT</a>, <a class="el" href="group__cpl__type.html#gga3f03371e201544e9115b40065e47f086ab2ab0f96a382011a38ee9446626fe1e0">CPL_TYPE_FLOAT_COMPLEX</a>, and <a class="el" href="group__cpl__type.html#gga3f03371e201544e9115b40065e47f086ae333db5ccea0813ccd892525b4ba1345">CPL_TYPE_INT</a>.</p>
</div>
</div>
<a class="anchor" id="gaf1c0a4858464aadaef04d42770db2f7c"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="group__cpl__error.html#ga44b4287e8a7a22122b94c220a1dd9459">cpl_error_code</a> cpl_flux_get_bias_window </td>
<td>(</td>
<td class="paramtype">const cpl_image * </td>
<td class="paramname"><em>diff</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> * </td>
<td class="paramname"><em>zone_def</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> </td>
<td class="paramname"><em>ron_hsize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> </td>
<td class="paramname"><em>ron_nsamp</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double * </td>
<td class="paramname"><em>bias</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double * </td>
<td class="paramname"><em>error</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Compute the bias in a rectangle. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">diff</td><td>Input image, usually a difference frame. </td></tr>
<tr><td class="paramname">zone_def</td><td>Zone where the bias is to be computed. </td></tr>
<tr><td class="paramname">ron_hsize</td><td>to specify half size of squares (<0 to use default) </td></tr>
<tr><td class="paramname">ron_nsamp</td><td>to specify the nb of samples (<0 to use default) </td></tr>
<tr><td class="paramname">bias</td><td>Output parameter: bias in the frame. </td></tr>
<tr><td class="paramname">error</td><td>Output parameter: error on the bias. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>CPL_ERROR_NONE on success or the relevant <a class="el" href="group__cpl__error.html#ga49a0c316d52d2afbfd9fd94b95344900" title="Available error codes. ">_cpl_error_code_</a> on error </dd></dl>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="group__cpl__detector.html#ga74968d3ccbe99f2e4ec868cb931bb87e" title="Compute the readout noise in a rectangle. ">cpl_flux_get_noise_window()</a>, rand() </dd></dl>
<dl class="section note"><dt>Note</dt><dd>No calls to srand() are made from CPL </dd></dl>
<p>References <a class="el" href="group__cpl__error.html#gga49a0c316d52d2afbfd9fd94b95344900a0239c1c63e9d21e98e45221a3ad60406">CPL_ERROR_NONE</a>.</p>
</div>
</div>
<a class="anchor" id="gad77be43229e187b59bad4cdd766a53d0"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="group__cpl__error.html#ga44b4287e8a7a22122b94c220a1dd9459">cpl_error_code</a> cpl_flux_get_noise_ring </td>
<td>(</td>
<td class="paramtype">const cpl_image * </td>
<td class="paramname"><em>diff</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const double * </td>
<td class="paramname"><em>zone_def</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> </td>
<td class="paramname"><em>ron_hsize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> </td>
<td class="paramname"><em>ron_nsamp</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double * </td>
<td class="paramname"><em>noise</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double * </td>
<td class="paramname"><em>error</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Compute the readout noise in a ring. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">diff</td><td>Input image, usually a difference frame. </td></tr>
<tr><td class="paramname">zone_def</td><td>Zone where the readout noise is to be computed. </td></tr>
<tr><td class="paramname">ron_hsize</td><td>to specify half size of squares (<0 to use default) </td></tr>
<tr><td class="paramname">ron_nsamp</td><td>to specify the nb of samples (<0 to use default) </td></tr>
<tr><td class="paramname">noise</td><td>On success, *noise is the noise in the frame. </td></tr>
<tr><td class="paramname">error</td><td>NULL, or on success, *error is the error in the noise </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>CPL_ERROR_NONE on success or the relevant <a class="el" href="group__cpl__error.html#ga49a0c316d52d2afbfd9fd94b95344900" title="Available error codes. ">_cpl_error_code_</a> on error </dd></dl>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="group__cpl__detector.html#ga74968d3ccbe99f2e4ec868cb931bb87e" title="Compute the readout noise in a rectangle. ">cpl_flux_get_noise_window()</a>, rand() </dd></dl>
<dl class="section note"><dt>Note</dt><dd>No calls to srand() are made from CPL</dd></dl>
<p>The provided zone is an array of four integers specifying the zone to take into account for the computation. The integers specify a ring as x, y, r1, r2 where these coordinates are given in the FITS notation (x from 1 to nx, y from 1 to ny and bottom to top).</p>
<p>Possible <a class="el" href="group__cpl__error.html#ga49a0c316d52d2afbfd9fd94b95344900" title="Available error codes. ">_cpl_error_code_</a> set in this function:</p>
<ul>
<li>CPL_ERROR_NULL_INPUT if diff noise or zone_def is NULL</li>
<li>CPL_ERROR_ILLEGAL_INPUT if the internal radius is bigger than the external one in zone_def</li>
<li>CPL_ERROR_DATA_NOT_FOUND if an insufficient number of samples were found inside the ring </li>
</ul>
<p>References <a class="el" href="group__cpl__bivector.html#gab49cf8bcea934646b96a4d4e476d7e54">cpl_bivector_delete()</a>, <a class="el" href="group__cpl__bivector.html#ga6df6e1f59656d27f36be998b18f53ea4">cpl_bivector_get_x_data_const()</a>, <a class="el" href="group__cpl__bivector.html#ga4efd181088428c4fe42541cad1c594af">cpl_bivector_get_y_data_const()</a>, <a class="el" href="group__cpl__error.html#ga79968a56c1b2ee25b12747ad7e1b3478">cpl_ensure_code</a>, <a class="el" href="group__cpl__error.html#gga49a0c316d52d2afbfd9fd94b95344900a5b82c7780a2a8a79dfafcac70717b830">CPL_ERROR_DATA_NOT_FOUND</a>, <a class="el" href="group__cpl__error.html#gga49a0c316d52d2afbfd9fd94b95344900ae6ab32df318c1af9afcddcb8249cad51">CPL_ERROR_ILLEGAL_INPUT</a>, <a class="el" href="group__cpl__error.html#gga49a0c316d52d2afbfd9fd94b95344900a0239c1c63e9d21e98e45221a3ad60406">CPL_ERROR_NONE</a>, <a class="el" href="group__cpl__error.html#gga49a0c316d52d2afbfd9fd94b95344900a7b054cf7927d1bd0a9b3693a6715be84">CPL_ERROR_NULL_INPUT</a>, <a class="el" href="group__cpl__errorstate.html#gadbf3f1525429b95837bc79a5e99b12cd">cpl_errorstate_get()</a>, <a class="el" href="group__cpl__errorstate.html#gab4487759414dfe1a7403321b86d5b3cd">cpl_errorstate_is_equal()</a>, <a class="el" href="group__cpl__errorstate.html#gaa72d44efb065d64d8f1cac3d0e5bf8af">cpl_errorstate_set()</a>, <a class="el" href="group__cpl__image.html#gab5a6bc059aa1d38c37ab5852b5170e45">cpl_image_get_size_x()</a>, <a class="el" href="group__cpl__image.html#gaf3495f9be1d6892cfed9c5232ccee350">cpl_image_get_size_y()</a>, <a class="el" href="group__cpl__image.html#ga0e366eb2c54499be78741bd4da925604">cpl_image_get_stdev_window()</a>, <a class="el" href="group__cpl__type.html#ga4f6c44a14bbc3aea87b1f47acf8dfd02">CPL_SIZE_FORMAT</a>, <a class="el" href="group__cpl__vector.html#gaf563c19d309c5b60d148a84cb156c2cf">cpl_vector_delete()</a>, <a class="el" href="group__cpl__vector.html#ga75be26b3974441825b596a77eb014da2">cpl_vector_get_median()</a>, <a class="el" href="group__cpl__vector.html#gac1dd7e2f4ff3e1cb9137d8af88e54df0">cpl_vector_get_stdev()</a>, <a class="el" href="group__cpl__vector.html#ga0a0d8b61b19cd1d3668525a3f2d55e72">cpl_vector_new()</a>, <a class="el" href="group__cpl__vector.html#ga13138212c2b535b08cd1174afa479d28">cpl_vector_set()</a>, <a class="el" href="group__cpl__vector.html#ga3d022e443df6e51ae2c005285d978957">cpl_vector_unwrap()</a>, and <a class="el" href="group__cpl__vector.html#ga1f52028a78be1cab17567cf15c483fcc">cpl_vector_wrap()</a>.</p>
</div>
</div>
<a class="anchor" id="ga74968d3ccbe99f2e4ec868cb931bb87e"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="group__cpl__error.html#ga44b4287e8a7a22122b94c220a1dd9459">cpl_error_code</a> cpl_flux_get_noise_window </td>
<td>(</td>
<td class="paramtype">const cpl_image * </td>
<td class="paramname"><em>diff</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> * </td>
<td class="paramname"><em>zone_def</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> </td>
<td class="paramname"><em>ron_hsize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__cpl__type.html#gacc431432a4fedf19ec6f7668dda3fbf0">cpl_size</a> </td>
<td class="paramname"><em>ron_nsamp</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double * </td>
<td class="paramname"><em>noise</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double * </td>
<td class="paramname"><em>error</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Compute the readout noise in a rectangle. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">diff</td><td>Input image, usually a difference frame. </td></tr>
<tr><td class="paramname">zone_def</td><td>Zone where the readout noise is to be computed. </td></tr>
<tr><td class="paramname">ron_hsize</td><td>to specify half size of squares (<0 to use default) </td></tr>
<tr><td class="paramname">ron_nsamp</td><td>to specify the nb of samples (<0 to use default) </td></tr>
<tr><td class="paramname">noise</td><td>Output parameter: noise in the frame. </td></tr>
<tr><td class="paramname">error</td><td>Output parameter: error on the noise. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>CPL_ERROR_NONE on success or the relevant <a class="el" href="group__cpl__error.html#ga49a0c316d52d2afbfd9fd94b95344900" title="Available error codes. ">_cpl_error_code_</a> on error </dd></dl>
<dl class="section see"><dt>See Also</dt><dd>rand() </dd></dl>
<dl class="section note"><dt>Note</dt><dd>No calls to srand() are made from CPL</dd></dl>
<p>This function is meant to compute the readout noise in a frame by means of a MonteCarlo approach. The input is a frame, usually a difference between two frames taken with the same settings for the acquisition system, although no check is done on that, it is up to the caller to feed in the right kind of frame.</p>
<p>The provided zone is an array of four integers specifying the zone to take into account for the computation. The integers specify ranges as xmin, xmax, ymin, ymax, where these coordinates are given in the FITS notation (x from 1 to lx, y from 1 to ly and bottom to top). Specify NULL instead of an array of four values to use the whole frame in the computation.</p>
<p>The algorithm will create typically 100 9x9 windows on the frame, scattered optimally using a Poisson law. In each window, the standard deviation of all pixels in the window is computed and this value is stored. The readout noise is the median of all computed standard deviations, and the error is the standard deviation of the standard deviations.</p>
<p>Both noise and error are returned by modifying a passed double. If you do not care about the error, pass NULL.</p>
<p>Possible <a class="el" href="group__cpl__error.html#ga49a0c316d52d2afbfd9fd94b95344900" title="Available error codes. ">_cpl_error_code_</a> set in this function:</p>
<ul>
<li>CPL_ERROR_NULL_INPUT if diff or noise is NULL</li>
<li>CPL_ERROR_ILLEGAL_INPUT if the specified window (zone_def) is invalid </li>
</ul>
<p>References <a class="el" href="group__cpl__error.html#gga49a0c316d52d2afbfd9fd94b95344900a0239c1c63e9d21e98e45221a3ad60406">CPL_ERROR_NONE</a>.</p>
</div>
</div>
</div><!-- contents -->
<!-- start footer part -->
<hr class="footer"/><address class="footer"><small>
Generated by  <a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/>
</a> 1.8.6
</small></address>
</body>
</html>
|