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Imported Upstream version 0.72.4

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TANIGUCHI Takaki
2012-04-08 21:33:59 +09:00
parent cef31abc8c
commit 2f23ea4b4a
1170 changed files with 116562 additions and 55295 deletions
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@@ -1,21 +1,22 @@
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>error correction</title>
<link rel="stylesheet" type="text/css" href="../include/dvdisaster.css">
</head>
<body>
<!--- Title header --->
<!-- Title header -->
<table width="100%" cellpadding="0" border="0">
<tr>
<td align="left">
<font size="+3"><b>dvdisaster</b></font>
<i>Version 0.72 (pl3)</i>
<span class="fxxl"><b>dvdisaster</b></span>
<i>Version 0.72.4 / 0.72 (pl4)</i>
</td>
<td align="right">
<font size="+3">&nbsp;</font><a href="http://dvdisaster.net/en/">To the Internet version</a>
<span class="fxxl">&nbsp;</span><a href="http://dvdisaster.net/en/">To the Internet version</a>
<a href="../cs/howtos61.html"></a>
<a href="../de/howtos61.html"></a>
<a href="../ru/howtos61.html"></a>
@@ -23,55 +24,53 @@
</tr>
</table>
<!--- Language chooser or separator --->
<!-- Language chooser or separator -->
<table width="100%" cellpadding="0" border="0">
<tr bgcolor="#000000">
<td colspan="2" width="100%"><img width=1 height=1 alt=""></td>
<tr>
<td colspan="2" class="hsep"></td>
</tr>
<tr><td colspan="2" width="100%" height="10">
<img width=1 height=1 alt="">
<tr><td colspan="2" style="height: 10px">
</td></tr>
</table>
<!--- Main body (Navigation, actual page content, optional news column) --->
<!-- Main body (Navigation, actual page content, optional news column) -->
<table width="100%" cellspacing=0>
<tr>
<!--- Navigation --->
<td bgcolor="#f0f0f0" valign="top" width="20%">
<!-- Navigation -->
<td style="background-color:#f0f0f0; vertical-align:top; width:20%;">
<table width="100%" cellpadding="10">
<tr>
<td>
<font size="-1"><b>Contents</b></font>
<span class="fs"><b>Contents</b></span>
<table width="100%" cellpadding="0" cellspacing="0">
<tr bgcolor="#000000">
<td width="100%"><img width=1 height=1 alt=""></td>
<tr>
<td class="hsep"></td>
</tr>
</table><p>
<table width="100%">
<tr><td colspan=3><font size="-1"><a href="news.html">News</a></font></td></tr>
<tr><td></td><td></td><td height="10"></td></tr>
<tr><td colspan=3><font size="-1"><a href="index.html">Overview</a></font></td></tr>
<tr><td></td><td></td><td height="10"></td></tr>
<tr><td colspan=3><font size="-1"><a href="howtos.html">Howtos</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos60.html">The big picture</a></font></td></tr>
<tr><td valign="top"></td><td>-</td><td><font size="-1">error correction</font></td></tr>
<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos62.html">correct usage</a></font></td></tr>
<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos63.html">incorrect usage</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos10.html">Scanning media for errors</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos20.html">Putting error correction data on a separate file</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos30.html">Putting error correction data on the medium</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos40.html">Recovering media images</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos50.html">Getting information about images and error correction data</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos90.html">Testing image compatibility</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtosa0.html">Dialogs and buttons</a></font></td></tr>
<tr><td></td><td></td><td height="10"></td></tr>
<tr><td colspan=3><font size="-1"><a href="download.html">Download</a></font></td></tr>
<tr><td></td><td></td><td height="10"></td></tr>
<tr><td colspan=3><font size="-1"><a href="qa.html">Questions and Answers</a></font></td></tr>
<tr><td></td><td></td><td height="10"></td></tr>
<tr><td colspan=3><font size="-1"><a href="feedback.html">Bug reporting</a></font></td></tr>
<tr><td colspan=3><span class="fs"><a href="news.html">News</a></span></td></tr>
<tr><td></td><td></td><td style="height:10px;"></td></tr>
<tr><td colspan=3><span class="fs"><a href="index.html">Overview</a></span></td></tr>
<tr><td></td><td></td><td style="height:10px;"></td></tr>
<tr><td colspan=3><span class="fs"><a href="howtos.html">Howtos</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs"><a href="howtos60.html">The big picture</a></span></td></tr>
<tr><td></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs">error correction</span></td></tr>
<tr><td></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs"><a href="howtos62.html">correct usage</a></span></td></tr>
<tr><td></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs"><a href="howtos63.html">incorrect usage</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs"><a href="howtos10.html">Scanning media for errors</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs"><a href="howtos20.html">Putting error correction data on a separate file</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs"><a href="howtos30.html">Putting error correction data on the medium</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs"><a href="howtos40.html">Recovering media images</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs"><a href="howtos50.html">Getting information about images and error correction data</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs"><a href="howtos90.html">Testing image compatibility</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs"><a href="howtosa0.html">Dialogs and buttons</a></span></td></tr>
<tr><td></td><td></td><td style="height:10px;"></td></tr>
<tr><td colspan=3><span class="fs"><a href="download.html">Download</a></span></td></tr>
<tr><td></td><td></td><td style="height:10px;"></td></tr>
<tr><td colspan=3><span class="fs"><a href="qa.html">Questions and Answers</a></span></td></tr>
<tr><td></td><td></td><td style="height:10px;"></td></tr>
<tr><td colspan=3><span class="fs"><a href="feedback.html">Bug reporting</a></span></td></tr>
</table>
</td>
</tr>
@@ -79,18 +78,18 @@
</td>
<td></td>
<!--- Actual page contents --->
<td valign="top" width="77%" rowspan="2">
<!-- Actual page contents -->
<td style="vertical-align:top; width:77%;" rowspan="2">
<!--- Insert actual page content below --->
<!-- Insert actual page content below -->
<h3>The idea behind the error correction</h3>
<h3 class="top">The idea behind the error correction</h3>
<table width="100%">
<tr valign="top">
<td><img src="../images/bad-cd.png"></td>
<td><img src="../images/bad-cd.png" alt="Icon: Damaged medium (partially unreadable)"></td>
<td> </td>
<td><img src="../images/ecc.png"></td>
<td><img src="../images/ecc.png" alt="Icon: Separate file with error correction data"></td>
<td> &nbsp; </td>
<td rowspan="3">
The example from the previous page told us how dvdisaster reconstructs
@@ -106,15 +105,15 @@ That'd really be a cheap shot ;-)
</tr>
<tr>
<td align="right">80%<img src="../images/rdiag-arrow.png"></td>
<td align="right" class="w65x">80%<img src="../images/rdiag-arrow.png" alt="Icon: Diagonal arrow right"></td>
<td> </td>
<td align="left"><img src="../images/ldiag-arrow.png">20%</td>
<td align="left" class="w65x"><img src="../images/ldiag-arrow.png" alt="Icon: Diagonal arrow left">20%</td>
<td> </td>
</tr>
<tr>
<td> </td>
<td> <img src="../images/good-image.png"></td>
<td> <img src="../images/good-image.png" alt="Icon: Complete image"></td>
<td> </td>
<td> </td>
</tr>
@@ -127,18 +126,18 @@ the numbers "8 6 2 3" into a code lock. Since the drawers do not contain
any sensitive information she decides to note down the numbers directly
on the desktop:<p>
<img src="../images/ecc-example1.png"><p>
<img src="../images/ecc-example1.png" alt="8 6 2 3"><p>
Anna is cautious and expects one of the numbers to become unreadable
by accidentally pouring ink over it. Therefore she also notes down
the sum of the four numbers (the "+" and "=" signs have only be added for
clarity):<p>
<img src="../images/ecc-example2.png"><p>
<img src="../images/ecc-example2.png" alt="8+6+2+3=19"><p>
After a while one of the numbers indeed gets covered by an ink spot:<p>
<img src="../images/ecc-example3.png"><p>
<img src="../images/ecc-example3.png" alt="8+&nbsp;+6+2+3=19"><p>
But this is not a problem as Anna can re-calculate the missing
number <i>x</i>
@@ -153,8 +152,8 @@ recovered from the remaining four. The example also demonstrates
some important properties of the error correction:
<p>
<table><tr><td><img src="../images/ecc-example4.png"></td><td>&nbsp;&nbsp;</td>
<td valign="top">
<table><tr><td><img src="../images/ecc-example4.png" alt="8+6+2+3 (medium)=19 (ecc)"></td><td>&nbsp;&nbsp;</td>
<td class="valignt">
For a given set of data (e.g. the numbers "8 6 2 3")
additional error correction data (e.g. the sum "19") can be created
so that a lost datum can be re-calculated from the remaining data.<p>
@@ -192,38 +191,40 @@ which does have such properties; however the required math is not taught
in school. Interested readers are therefore referred to the respective
books in coding theory.
<!--- do not change below --->
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</td> <!--- end of page contents --->
</td> <!-- end of page contents -->
</tr>
<!--
<tr valign="bottom">
<td bgcolor="#f0f0f0">
<table cellpadding="10"><tr><td><a href="http://dvdisaster.net/legacy/en/index.html"><font size="-1">Old documentation (V0.70)</font></a></td></tr></table>
<td style="background-color:#f0f0f0;">
<table cellpadding="10"><tr><td><a href="http://dvdisaster.net/legacy/en/index.html"><span class="fs"></span></a></td></tr></table>
</td>
<td></td>
<td></td>
</tr>
</table> <!--- end of main body table --->
-->
</table> <!-- end of main body table -->
<!--- Page footer --->
<!-- Page footer -->
<table width="100%" cellpadding="0" border="0">
<tr><td colspan="2" width="100%" height="10"><img width=1 height=1 alt=""></td>
<tr><td colspan="2" style="width:100%; height:10px;"></td>
</tr>
<tr bgcolor="#000000"><td colspan="2" width="100%"><img width=1 height=1 alt=""></td>
<tr><td colspan="2" class="hsep"></td>
</tr>
<tr>
<td align="center">
<font size="-1">
<i> Copyright 2004-2011 Carsten Gnörlich.<br>
<span class="fs">
<i> Copyright 2004-2012 Carsten Gnörlich.<br>
Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.
</i>
</font>
</span>
</td>
</tr>
<tr bgcolor="#000000"><td colspan="2" width="100%"><img width=1 height=1 alt=""></td>
<tr><td colspan="2" class="hsep"></td>
</tr>
</table>
</body>