osama347/kyc-verification
0
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733<body class="manpage">
734<div id="header">
735<h1>
736UNICHARSET(5) Manual Page
737</h1>
738<h2>NAME</h2>
739<div class="sectionbody">
740<p>unicharset -
741 character properties file used by tesseract(1)
742</p>
743</div>
744</div>
745<div id="content">
746<div class="sect1">
747<h2 id="_description">DESCRIPTION</h2>
748<div class="sectionbody">
749<div class="paragraph"><p>Tesseract’s unicharset file contains information on each symbol
750(unichar) the Tesseract OCR engine is trained to recognize.</p></div>
751<div class="paragraph"><p>A unicharset file (i.e. <em>eng.unicharset</em>) is distributed as part of a
752Tesseract language pack (i.e. <em>eng.traineddata</em>). For information on
753extracting the unicharset file, see combine_tessdata(1).</p></div>
754<div class="paragraph"><p>The first line of a unicharset file contains the number of unichars in
755the file. After this line, each subsequent line provides information for
756a single unichar. The first such line contains a placeholder reserved for
757the space character. Each unichar is referred to within Tesseract by its
758Unichar ID, which is the line number (minus 1) within the unicharset file.
759Therefore, space gets unichar 0.</p></div>
760<div class="paragraph"><p>Each unichar line in the unicharset file (v2+) may have four space-separated fields:</p></div>
761<div class="literalblock">
762<div class="content monospaced">
763<pre>'character' 'properties' 'script' 'id'</pre>
764</div></div>
765<div class="paragraph"><p>Starting with Tesseract v3.02, more information may be given for each unichar:</p></div>
766<div class="literalblock">
767<div class="content monospaced">
768<pre>'character' 'properties' 'glyph_metrics' 'script' 'other_case' 'direction' 'mirror' 'normed_form'</pre>
769</div></div>
770<div class="paragraph"><p>Entries:</p></div>
771<div class="dlist"><dl>
772<dt class="hdlist1">
773<em>character</em>
774</dt>
775<dd>
776<p>
777The UTF-8 encoded string to be produced for this unichar.
778</p>
779</dd>
780<dt class="hdlist1">
781<em>properties</em>
782</dt>
783<dd>
784<p>
785An integer mask of character properties, one per bit.
786 From least to most significant bit, these are: isalpha, islower, isupper,
787 isdigit, ispunctuation.
788</p>
789</dd>
790<dt class="hdlist1">
791<em>glyph_metrics</em>
792</dt>
793<dd>
794<p>
795Ten comma-separated integers representing various standards
796 for where this glyph is to be found within a baseline-normalized coordinate
797 system where 128 is normalized to x-height.
798</p>
799<div class="ulist"><ul>
800<li>
801<p>
802min_bottom, max_bottom: the ranges where the bottom of the character can
803 be found.
804</p>
805</li>
806<li>
807<p>
808min_top, max_top: the ranges where the top of the character may be found.
809</p>
810</li>
811<li>
812<p>
813min_width, max_width: horizontal width of the character.
814</p>
815</li>
816<li>
817<p>
818min_bearing, max_bearing: how far from the usual start position does the
819 leftmost part of the character begin.
820</p>
821</li>
822<li>
823<p>
824min_advance, max_advance: how far from the printer’s cell left do we
825 advance to begin the next character.
826</p>
827</li>
828</ul></div>
829</dd>
830<dt class="hdlist1">
831<em>script</em>
832</dt>
833<dd>
834<p>
835Name of the script (Latin, Common, Greek, Cyrillic, Han, null).
836</p>
837</dd>
838<dt class="hdlist1">
839<em>other_case</em>
840</dt>
841<dd>
842<p>
843The Unichar ID of the other case version of this character
844 (upper or lower).
845</p>
846</dd>
847<dt class="hdlist1">
848<em>direction</em>
849</dt>
850<dd>
851<p>
852The Unicode BiDi direction of this character, as defined by
853 ICU’s enum UCharDirection. (0 = Left to Right, 1 = Right to Left,
854 2 = European Number…)
855</p>
856</dd>
857<dt class="hdlist1">
858<em>mirror</em>
859</dt>
860<dd>
861<p>
862The Unichar ID of the BiDirectional mirror of this character.
863 For example the mirror of open paren is close paren, but Latin Capital C
864 has no mirror, so it remains a Latin Capital C.
865</p>
866</dd>
867<dt class="hdlist1">
868<em>normed_form</em>
869</dt>
870<dd>
871<p>
872The UTF-8 representation of a "normalized form" of this unichar
873 for the purpose of blaming a module for errors given ground truth text.
874 For instance, a left or right single quote may normalize to an ASCII quote.
875</p>
876</dd>
877</dl></div>
878</div>
879</div>
880<div class="sect1">
881<h2 id="_example_v2">EXAMPLE (v2)</h2>
882<div class="sectionbody">
883<div class="literalblock">
884<div class="content monospaced">
885<pre>; 10 Common 46
886b 3 Latin 59
887W 5 Latin 40
8887 8 Common 66
889= 0 Common 93</pre>
890</div></div>
891<div class="paragraph"><p>";" is a punctuation character. Its properties are thus represented by the
892binary number 10000 (10 in hexadecimal).</p></div>
893<div class="paragraph"><p>"b" is an alphabetic character and a lower case character. Its properties are
894thus represented by the binary number 00011 (3 in hexadecimal).</p></div>
895<div class="paragraph"><p>"W" is an alphabetic character and an upper case character. Its properties are
896thus represented by the binary number 00101 (5 in hexadecimal).</p></div>
897<div class="paragraph"><p>"7" is just a digit. Its properties are thus represented by the binary number
89801000 (8 in hexadecimal).</p></div>
899<div class="paragraph"><p>"=" is not punctuation nor a digit nor an alphabetic character. Its properties
900are thus represented by the binary number 00000 (0 in hexadecimal).</p></div>
901<div class="paragraph"><p>Japanese or Chinese alphabetic character properties are represented by the
902binary number 00001 (1 in hexadecimal): they are alphabetic, but neither
903upper nor lower case.</p></div>
904</div>
905</div>
906<div class="sect1">
907<h2 id="_example_v3_02">EXAMPLE (v3.02)</h2>
908<div class="sectionbody">
909<div class="literalblock">
910<div class="content monospaced">
911<pre>110
912NULL 0 NULL 0
913N 5 59,68,216,255,87,236,0,27,104,227 Latin 11 0 1 N
914Y 5 59,68,216,255,91,205,0,47,91,223 Latin 33 0 2 Y
9151 8 59,69,203,255,45,128,0,66,74,173 Common 3 2 3 1
9169 8 18,66,203,255,89,156,0,39,104,173 Common 4 2 4 9
917a 3 58,65,186,198,85,164,0,26,97,185 Latin 56 0 5 a
918. . .</pre>
919</div></div>
920</div>
921</div>
922<div class="sect1">
923<h2 id="_caveats">CAVEATS</h2>
924<div class="sectionbody">
925<div class="paragraph"><p>Although the unicharset reader maintains the ability to read unicharsets
926of older formats and will assign default values to missing fields,
927the accuracy will be degraded.</p></div>
928<div class="paragraph"><p>Further, most other data files are indexed by the unicharset file,
929so changing it without re-generating the others is likely to have dire
930consequences.</p></div>
931</div>
932</div>
933<div class="sect1">
934<h2 id="_history">HISTORY</h2>
935<div class="sectionbody">
936<div class="paragraph"><p>The unicharset format first appeared with Tesseract 2.00, which was the
937first version to support languages other than English. The unicharset file
938contained only the first two fields, and the "ispunctuation" property was
939absent (punctuation was regarded as "0", as "=" is in the above example.</p></div>
940</div>
941</div>
942<div class="sect1">
943<h2 id="_see_also">SEE ALSO</h2>
944<div class="sectionbody">
945<div class="paragraph"><p>tesseract(1), combine_tessdata(1), unicharset_extractor(1)</p></div>
946<div class="paragraph"><p><a href="https://tesseract-ocr.github.io/tessdoc/Training-Tesseract.html">https://tesseract-ocr.github.io/tessdoc/Training-Tesseract.html</a></p></div>
947</div>
948</div>
949<div class="sect1">
950<h2 id="_author">AUTHOR</h2>
951<div class="sectionbody">
952<div class="paragraph"><p>The Tesseract OCR engine was written by Ray Smith and his research groups
953at Hewlett Packard (1985-1995) and Google (2006-2018).</p></div>
954</div>
955</div>
956</div>
957<div id="footnotes"><hr></div>
958<div id="footer">
959<div id="footer-text">
960Last updated
961 2024-05-19 13:04:22 CEST
962</div>
963</div>
964</body>
965</html>
966