mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-12-05 02:47:00 +08:00
58e06c8c45
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@670 d0cd1f9f-072b-0410-8dd7-cf729c803f20
788 lines
19 KiB
HTML
788 lines
19 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
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"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<meta name="generator" content="AsciiDoc 8.5.2" />
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<title>UNICHARSET(5)</title>
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<style type="text/css">
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/* Debug borders */
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p, li, dt, dd, div, pre, h1, h2, h3, h4, h5, h6 {
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/*
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border: 1px solid red;
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*/
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}
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body {
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margin: 1em 5% 1em 5%;
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}
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a {
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color: blue;
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text-decoration: underline;
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}
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a:visited {
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color: fuchsia;
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}
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em {
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font-style: italic;
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color: navy;
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}
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strong {
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font-weight: bold;
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color: #083194;
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}
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tt {
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color: navy;
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}
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h1, h2, h3, h4, h5, h6 {
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color: #527bbd;
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font-family: sans-serif;
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margin-top: 1.2em;
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margin-bottom: 0.5em;
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line-height: 1.3;
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}
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h1, h2, h3 {
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border-bottom: 2px solid silver;
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}
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h2 {
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padding-top: 0.5em;
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}
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h3 {
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float: left;
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}
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h3 + * {
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clear: left;
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}
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div.sectionbody {
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font-family: serif;
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margin-left: 0;
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}
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hr {
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border: 1px solid silver;
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}
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p {
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margin-top: 0.5em;
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margin-bottom: 0.5em;
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}
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ul, ol, li > p {
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margin-top: 0;
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}
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pre {
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padding: 0;
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margin: 0;
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}
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span#author {
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color: #527bbd;
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font-family: sans-serif;
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font-weight: bold;
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font-size: 1.1em;
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span#email {
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span#revnumber, span#revdate, span#revremark {
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div#footer {
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font-family: sans-serif;
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padding-top: 0.5em;
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margin-top: 4.0em;
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}
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div#footer-text {
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float: left;
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div#footer-badges {
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float: right;
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padding-bottom: 0.5em;
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div#preamble {
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margin-top: 1.5em;
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margin-bottom: 1.5em;
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}
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div.tableblock, div.imageblock, div.exampleblock, div.verseblock,
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div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
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div.admonitionblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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div.admonitionblock {
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margin-top: 2.0em;
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margin-bottom: 2.0em;
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margin-right: 10%;
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color: #606060;
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div.content { /* Block element content. */
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padding: 0;
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color: #527bbd;
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margin-top: 1.0em;
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margin-bottom: 0.5em;
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div.title + * {
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margin-top: 0;
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}
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td div.title:first-child {
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div.content + div.title {
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div.sidebarblock > div.content {
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background: #ffffee;
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border: 1px solid silver;
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padding: 0.5em;
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}
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div.listingblock > div.content {
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border: 1px solid silver;
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background: #f4f4f4;
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padding: 0.5em;
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}
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div.quoteblock, div.verseblock {
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padding-left: 1.0em;
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margin-left: 1.0em;
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margin-right: 10%;
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color: #777777;
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div.quoteblock > div.attribution {
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padding-top: 0.5em;
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text-align: right;
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div.verseblock > div.content {
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white-space: pre;
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div.verseblock > div.attribution {
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padding-top: 0.75em;
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text-align: left;
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}
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/* DEPRECATED: Pre version 8.2.7 verse style literal block. */
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div.verseblock + div.attribution {
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text-align: left;
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}
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div.admonitionblock .icon {
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font-size: 1.1em;
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font-weight: bold;
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color: #527bbd;
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padding-right: 0.5em;
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div.admonitionblock td.content {
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padding-left: 0.5em;
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border-left: 3px solid #dddddd;
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}
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div.exampleblock > div.content {
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border-left: 3px solid #dddddd;
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padding-left: 0.5em;
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}
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div.imageblock div.content { padding-left: 0; }
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span.image img { border-style: none; }
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a.image:visited { color: white; }
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dl {
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margin-top: 0.8em;
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margin-bottom: 0.8em;
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}
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dt {
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margin-top: 0.5em;
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color: navy;
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dd > *:first-child {
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margin-top: 0.1em;
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}
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ul, ol {
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list-style-position: outside;
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}
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ol.arabic {
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list-style-type: decimal;
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}
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ol.loweralpha {
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list-style-type: lower-alpha;
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}
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ol.upperalpha {
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list-style-type: upper-alpha;
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}
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ol.lowerroman {
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list-style-type: lower-roman;
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}
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ol.upperroman {
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list-style-type: upper-roman;
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}
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div.compact ul, div.compact ol,
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div.compact p, div.compact p,
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div.compact div, div.compact div {
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margin-top: 0.1em;
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margin-bottom: 0.1em;
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}
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div.tableblock > table {
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border: 3px solid #527bbd;
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}
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thead, p.table.header {
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font-weight: bold;
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}
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tfoot {
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font-weight: bold;
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}
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td > div.verse {
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white-space: pre;
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}
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p.table {
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margin-top: 0;
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}
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/* Because the table frame attribute is overriden by CSS in most browsers. */
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div.tableblock > table[frame="void"] {
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border-style: none;
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}
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div.tableblock > table[frame="hsides"] {
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border-right-style: none;
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}
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div.tableblock > table[frame="vsides"] {
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border-bottom-style: none;
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}
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div.hdlist {
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margin-top: 0.8em;
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margin-bottom: 0.8em;
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}
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div.hdlist tr {
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padding-bottom: 15px;
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}
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dt.hdlist1.strong, td.hdlist1.strong {
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font-weight: bold;
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}
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td.hdlist1 {
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font-style: normal;
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padding-right: 0.8em;
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color: navy;
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}
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td.hdlist2 {
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vertical-align: top;
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}
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div.hdlist.compact tr {
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margin: 0;
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padding-bottom: 0;
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}
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.comment {
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background: yellow;
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}
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.footnote, .footnoteref {
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font-size: 0.8em;
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}
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span.footnote, span.footnoteref {
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vertical-align: super;
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}
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#footnotes {
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margin: 20px 0 20px 0;
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padding: 7px 0 0 0;
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}
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#footnotes div.footnote {
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margin: 0 0 5px 0;
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}
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#footnotes hr {
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border: none;
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border-top: 1px solid silver;
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height: 1px;
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text-align: left;
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margin-left: 0;
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width: 20%;
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min-width: 100px;
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}
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@media print {
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div#footer-badges { display: none; }
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}
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div#toc {
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margin-bottom: 2.5em;
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}
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div#toctitle {
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color: #527bbd;
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font-family: sans-serif;
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font-size: 1.1em;
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font-weight: bold;
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margin-top: 1.0em;
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margin-bottom: 0.1em;
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}
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div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
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margin-top: 0;
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margin-bottom: 0;
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}
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div.toclevel2 {
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margin-left: 2em;
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font-size: 0.9em;
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}
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div.toclevel3 {
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margin-left: 4em;
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font-size: 0.9em;
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}
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div.toclevel4 {
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margin-left: 6em;
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font-size: 0.9em;
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}
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/* Overrides for manpage documents */
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h1 {
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padding-top: 0.5em;
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padding-bottom: 0.5em;
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border-top: 2px solid silver;
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border-bottom: 2px solid silver;
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}
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h2 {
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border-style: none;
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}
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div.sectionbody {
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margin-left: 5%;
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}
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@media print {
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div#toc { display: none; }
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}
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/* Workarounds for IE6's broken and incomplete CSS2. */
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div.sidebar-content {
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background: #ffffee;
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border: 1px solid silver;
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padding: 0.5em;
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}
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div.sidebar-title, div.image-title {
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color: #527bbd;
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font-family: sans-serif;
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font-weight: bold;
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margin-top: 0.0em;
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margin-bottom: 0.5em;
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}
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div.listingblock div.content {
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border: 1px solid silver;
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background: #f4f4f4;
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padding: 0.5em;
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}
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div.quoteblock-attribution {
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padding-top: 0.5em;
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text-align: right;
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}
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div.verseblock-content {
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white-space: pre;
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}
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div.verseblock-attribution {
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padding-top: 0.75em;
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text-align: left;
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}
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div.exampleblock-content {
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border-left: 3px solid #dddddd;
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padding-left: 0.5em;
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}
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/* IE6 sets dynamically generated links as visited. */
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div#toc a:visited { color: blue; }
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</style>
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<script type="text/javascript">
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/*<+'])');
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// Function that scans the DOM tree for header elements (the DOM2
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// nodeIterator API would be a better technique but not supported by all
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// browsers).
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var iterate = function (el) {
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for (var i = el.firstChild; i != null; i = i.nextSibling) {
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if (i.nodeType == 1 /* Node.ELEMENT_NODE */) {
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var mo = re.exec(i.tagName);
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if (mo && (i.getAttribute("class") || i.getAttribute("className")) != "float") {
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result[result.length] = new TocEntry(i, getText(i), mo[1]-1);
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}
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iterate(i);
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}
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}
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}
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iterate(el);
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return result;
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}
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var toc = document.getElementById("toc");
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if (entry.element.id == "")
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entry.element.id = "_toc_" + i;
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var a = document.createElement("a");
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a.href = "#" + entry.element.id;
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a.appendChild(document.createTextNode(entry.text));
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var div = document.createElement("div");
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div.appendChild(a);
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div.className = "toclevel" + entry.toclevel;
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toc.appendChild(div);
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}
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if (entries.length == 0)
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toc.parentNode.removeChild(toc);
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},
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/////////////////////////////////////////////////////////////////////
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// Footnotes generator
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/////////////////////////////////////////////////////////////////////
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/* Based on footnote generation code from:
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* http://www.brandspankingnew.net/archive/2005/07/format_footnote.html
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*/
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footnotes: function () {
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var cont = document.getElementById("content");
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var noteholder = document.getElementById("footnotes");
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var spans = cont.getElementsByTagName("span");
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var refs = {};
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var n = 0;
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for (i=0; i<spans.length; i++) {
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if (spans[i].className == "footnote") {
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n++;
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// Use [\s\S] in place of . so multi-line matches work.
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// Because JavaScript has no s (dotall) regex flag.
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note = spans[i].innerHTML.match(/\s*\[([\s\S]*)]\s*/)[1];
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noteholder.innerHTML +=
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"<div class='footnote' id='_footnote_" + n + "'>" +
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"<a href='#_footnoteref_" + n + "' title='Return to text'>" +
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n + "</a>. " + note + "</div>";
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spans[i].innerHTML =
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"[<a id='_footnoteref_" + n + "' href='#_footnote_" + n +
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"' title='View footnote' class='footnote'>" + n + "</a>]";
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var id =spans[i].getAttribute("id");
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if (id != null) refs["#"+id] = n;
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}
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}
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if (n == 0)
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noteholder.parentNode.removeChild(noteholder);
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else {
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// Process footnoterefs.
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for (i=0; i<spans.length; i++) {
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if (spans[i].className == "footnoteref") {
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var href = spans[i].getElementsByTagName("a")[0].getAttribute("href");
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href = href.match(/#.*/)[0]; // Because IE return full URL.
|
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n = refs[href];
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spans[i].innerHTML =
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"[<a href='#_footnote_" + n +
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"' title='View footnote' class='footnote'>" + n + "</a>]";
|
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}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
/*]]>*/
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|
</script>
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|
</head>
|
|
<body>
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<div id="header">
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<h1>
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|
UNICHARSET(5) Manual Page
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</h1>
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<h2>NAME</h2>
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<div class="sectionbody">
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<p>unicharset -
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character properties file used by tesseract(1)
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</p>
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</div>
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</div>
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<div id="content">
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<h2 id="_description">DESCRIPTION</h2>
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<div class="sectionbody">
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<div class="paragraph"><p>Tesseract’s unicharset file contains information on each symbol
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(unichar) the Tesseract OCR engine is trained to recognize.</p></div>
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<div class="paragraph"><p>A unicharset file (i.e. <em>eng.unicharset</em>) is distributed as part of a
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Tesseract language pack (i.e. <em>eng.traineddata</em>). For information on
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extracting the unicharset file, see combine_tessdata(1).</p></div>
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<div class="paragraph"><p>The first line of a unicharset file contains the number of unichars in
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the file. After this line, each subsequent line provides information for
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a single unichar. The first such line contains a placeholder reserved for
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the space character. Each unichar is referred to within Tesseract by its
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Unichar ID, which is the line number (minus 1) within the unicharset file.
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Therefore, space gets unichar 0.</p></div>
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<div class="paragraph"><p>Each unichar line in the unicharset file (v2+) may have four space-separated fields:</p></div>
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<div class="literalblock">
|
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<div class="content">
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<pre><tt>'character' 'properties' 'script' 'id'</tt></pre>
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</div></div>
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<div class="paragraph"><p>Starting with Tesseract v3.02, more information may be given for each unichar:</p></div>
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<div class="literalblock">
|
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<div class="content">
|
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<pre><tt>'character' 'properties' 'glyph_metrics' 'script' 'other_case' 'direction' 'mirror' 'normed_form'</tt></pre>
|
|
</div></div>
|
|
<div class="paragraph"><p>Entries:</p></div>
|
|
<div class="dlist"><dl>
|
|
<dt class="hdlist1">
|
|
<em>character</em>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
The UTF-8 encoded string to be produced for this unichar.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<em>properties</em>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
An integer mask of character properties, one per bit.
|
|
From least to most significant bit, these are: isalpha, islower, isupper,
|
|
isdigit, ispunctuation.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<em>glyph_metrics</em>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Ten comma-separated integers representing various standards
|
|
for where this glyph is to be found within a baseline-normalized coordinate
|
|
system where 128 is normalized to x-height.
|
|
</p>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
min_bottom, max_bottom: the ranges where the bottom of the character can
|
|
be found.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
min_top, max_top: the ranges where the top of the character may be found.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
min_width, max_width: horizontal width of the character.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
min_bearing, max_bearing: how far from the usual start position does the
|
|
leftmost part of the character begin.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
min_advance, max_advance: how far from the printer’s cell left do we
|
|
advance to begin the next character.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<em>script</em>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Name of the script (Latin, Common, Greek, Cyrillic, Han, null).
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<em>other_case</em>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
The Unichar ID of the other case version of this character
|
|
(upper or lower).
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<em>direction</em>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
The Unicode BiDi direction of this character, as defined by
|
|
ICU’s enum UCharDirection. (0 = Left to Right, 1 = Right to Left,
|
|
2 = European Number…)
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<em>mirror</em>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
The Unichar ID of the BiDirectional mirror of this character.
|
|
For example the mirror of open paren is close paren, but Latin Capital C
|
|
has no mirror, so it remains a Latin Capital C.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<em>normed_form</em>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
The UTF-8 representation of a "normalized form" of this unichar
|
|
for the purpose of blaming a module for errors given ground truth text.
|
|
For instance, a left or right single quote may normalize to an ASCII quote.
|
|
</p>
|
|
</dd>
|
|
</dl></div>
|
|
</div>
|
|
<h2 id="_example_v2">EXAMPLE (v2)</h2>
|
|
<div class="sectionbody">
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><tt>; 10 Common 46
|
|
b 3 Latin 59
|
|
W 5 Latin 40
|
|
7 8 Common 66
|
|
= 0 Common 93</tt></pre>
|
|
</div></div>
|
|
<div class="paragraph"><p>";" is a punctuation character. Its properties are thus represented by the
|
|
binary number 10000 (10 in hexadecimal).</p></div>
|
|
<div class="paragraph"><p>"b" is an alphabetic character and a lower case character. Its properties are
|
|
thus represented by the binary number 00011 (3 in hexadecimal).</p></div>
|
|
<div class="paragraph"><p>"W" is an alphabetic character and an upper case character. Its properties are
|
|
thus represented by the binary number 00101 (5 in hexadecimal).</p></div>
|
|
<div class="paragraph"><p>"7" is just a digit. Its properties are thus represented by the binary number
|
|
01000 (8 in hexadecimal).</p></div>
|
|
<div class="paragraph"><p>"=" is not punctuation nor a digit nor an alphabetic character. Its properties
|
|
are thus represented by the binary number 00000 (0 in hexadecimal).</p></div>
|
|
<div class="paragraph"><p>Japanese or Chinese alphabetic character properties are represented by the
|
|
binary number 00001 (1 in hexadecimal): they are alphabetic, but neither
|
|
upper nor lower case.</p></div>
|
|
</div>
|
|
<h2 id="_example_v3_02">EXAMPLE (v3.02)</h2>
|
|
<div class="sectionbody">
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><tt>110
|
|
NULL 0 NULL 0
|
|
N 5 59,68,216,255,87,236,0,27,104,227 Latin 11 0 1 N
|
|
Y 5 59,68,216,255,91,205,0,47,91,223 Latin 33 0 2 Y
|
|
1 8 59,69,203,255,45,128,0,66,74,173 Common 3 2 3 1
|
|
9 8 18,66,203,255,89,156,0,39,104,173 Common 4 2 4 9
|
|
a 3 58,65,186,198,85,164,0,26,97,185 Latin 56 0 5 a
|
|
. . .</tt></pre>
|
|
</div></div>
|
|
</div>
|
|
<h2 id="_caveats">CAVEATS</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>Although the unicharset reader maintains the ability to read unicharsets
|
|
of older formats and will assign default values to missing fields,
|
|
the accuracy will be degraded.</p></div>
|
|
<div class="paragraph"><p>Further, most other data files are indexed by the unicharset file,
|
|
so changing it without re-generating the others is likely to have dire
|
|
consequences.</p></div>
|
|
</div>
|
|
<h2 id="_history">HISTORY</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The unicharset format first appeared with Tesseract 2.00, which was the
|
|
first version to support languages other than English. The unicharset file
|
|
contained only the first two fields, and the "ispunctuation" property was
|
|
absent (punctuation was regarded as "0", as "=" is in the above example.</p></div>
|
|
</div>
|
|
<h2 id="_see_also">SEE ALSO</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>tesseract(1), combine_tessdata(1), unicharset_extractor(1)</p></div>
|
|
<div class="paragraph"><p><a href="http://code.google.com/p/tesseract-ocr/wiki/TrainingTesseract3">http://code.google.com/p/tesseract-ocr/wiki/TrainingTesseract3</a></p></div>
|
|
</div>
|
|
<h2 id="_author">AUTHOR</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The Tesseract OCR engine was written by Ray Smith and his research groups
|
|
at Hewlett Packard (1985-1995) and Google (2006-present).</p></div>
|
|
</div>
|
|
</div>
|
|
<div id="footnotes"><hr /></div>
|
|
<div id="footer">
|
|
<div id="footer-text">
|
|
Last updated 2012-02-08 11:01:57 PDT
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
|