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<div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Automated recognition of braille characters</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Braille_text.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ee/Braille_text.jpg/220px-Braille_text.jpg" decoding="async" width="220" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ee/Braille_text.jpg/330px-Braille_text.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ee/Braille_text.jpg/440px-Braille_text.jpg 2x" data-file-width="3266" data-file-height="2613" /></a><figcaption>Image of a page showing both the raised braille characters, and the recessed characters on the other side of the page.</figcaption></figure> <p><b>Optical braille recognition</b> is technology to capture and process images of <a href="/wiki/Braille" title="Braille">braille</a> characters into <a href="/wiki/Natural_language" title="Natural language">natural language</a> characters. It is used to convert braille documents for people who cannot read them into text, and for preservation and reproduction of the documents. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Optical_braille_recognition&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In 1984, a group of researchers at the <a href="/wiki/Delft_University_of_Technology" title="Delft University of Technology">Delft University of Technology</a> designed a braille reading tablet, in which a reading head with photosensitive cells was moved along set of rulers to capture braille text line-by-line.<sup id="cite_ref-Mennens_1-0" class="reference"><a href="#cite_note-Mennens-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> In 1988, a group of French researchers at the <a href="/wiki/Lille_University_of_Science_and_Technology" title="Lille University of Science and Technology">Lille University of Science and Technology</a> developed an <a href="/wiki/Algorithm" title="Algorithm">algorithm</a>, called Lectobraille, which converted braille documents into plain text. The system photographed the braille text with a low-resolution <a href="/wiki/CCD_camera" class="mw-redirect" title="CCD camera">CCD camera</a>, and used <a href="/wiki/Spatial_filter" title="Spatial filter">spatial filtering</a> techniques, <a href="/wiki/Median_filter" title="Median filter">median filtering</a>, <a href="/wiki/Erosion_(morphology)" title="Erosion (morphology)">erosion</a>, and <a href="/wiki/Dilation_(morphology)" title="Dilation (morphology)">dilation</a> to extract the braille. The braille characters were then converted to natural language using <a href="/w/index.php?title=Adaptive_recognition&action=edit&redlink=1" class="new" title="Adaptive recognition (page does not exist)">adaptive recognition</a>.<sup id="cite_ref-Lectobraille_2-0" class="reference"><a href="#cite_note-Lectobraille-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The Lectobraille technique had an error rate of 1%, and took an average processing time of seven seconds per line.<sup id="cite_ref-Mennens_1-1" class="reference"><a href="#cite_note-Mennens-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> In 1993, a group of researchers from the <a href="/wiki/Katholieke_Universiteit_Leuven" class="mw-redirect" title="Katholieke Universiteit Leuven">Katholieke Universiteit Leuven</a> developed a system to recognize braille that had been scanned with a commercially available <a href="/wiki/Image_scanner" title="Image scanner">scanner</a>.<sup id="cite_ref-Mennens_1-2" class="reference"><a href="#cite_note-Mennens-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The system, however, was unable to handle deformities in the braille grid, so well-formed braille documents were required.<sup id="cite_ref-Wong_3-0" class="reference"><a href="#cite_note-Wong-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> In 1999, a group at the <a href="/wiki/Hong_Kong_Polytechnic_University" title="Hong Kong Polytechnic University">Hong Kong Polytechnic University</a> implemented an optical braille recognition technique using <a href="/wiki/Edge_detection" title="Edge detection">edge detection</a> to translate braille into English or Chinese text.<sup id="cite_ref-Ng_4-0" class="reference"><a href="#cite_note-Ng-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> In 2001, Murray and Dais created a handheld recognition system, that scanned small sections of a document at once.<sup id="cite_ref-Murray_5-0" class="reference"><a href="#cite_note-Murray-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Because of the small area scanned at once, grid deformation was less of an issue, and a simpler, more efficient algorithm was employed.<sup id="cite_ref-Wong_3-1" class="reference"><a href="#cite_note-Wong-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> In 2003, Morgavi and Morando designed a system to recognize braille characters using <a href="/wiki/Artificial_neural_network" class="mw-redirect" title="Artificial neural network">artificial neural networks</a>. This system was noted for its ability to handle image degradation more successfully than other approaches.<sup id="cite_ref-Wong_3-2" class="reference"><a href="#cite_note-Wong-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Challenges">Challenges</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Optical_braille_recognition&action=edit&section=2" title="Edit section: Challenges"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Many of the challenges to successfully processing braille text arise from the nature of braille documents. Braille is generally printed on solid-color paper, with no ink to produce contrast between the raised characters and the background paper. However, imperfections in the page can appear in a scan or image of the page. </p><p>Many documents are printed <i>inter-point</i>, meaning they are double-sided. As such, the depressions of the braille of one side appear interlaid with the protruding braille of the other side.<sup id="cite_ref-Antonacopoulos_6-0" class="reference"><a href="#cite_note-Antonacopoulos-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Techniques">Techniques</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Optical_braille_recognition&action=edit&section=3" title="Edit section: Techniques"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Some optical braille recognition techniques attempt to use <a href="/wiki/Oblique_angle" class="mw-redirect" title="Oblique angle">oblique</a> lighting and a camera to reveal the shadows of the depressions and protrusions of the braille. Others make use of commercially available document scanners.<sup id="cite_ref-Antonacopoulos_6-1" class="reference"><a href="#cite_note-Antonacopoulos-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Optical_braille_recognition&action=edit&section=4" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Optical_character_recognition" title="Optical character recognition">Optical character recognition</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Optical_braille_recognition&action=edit&section=5" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-Mennens-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-Mennens_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Mennens_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Mennens_1-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFMennensTichelenFrançoisEngelen1994" class="citation journal cs1">Mennens, Jan; Tichelen, Luc van; François, Guido; Engelen, Jan J. (December 1994). "Optical recognition of Braille using standard equipment". <i>IEEE Transactions on Rehabilitation Engineering</i>. <b>2</b> (4): 207–212. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1109%2F86.340878">10.1109/86.340878</a>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/1063-6528">1063-6528</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=IEEE+Transactions+on+Rehabilitation+Engineering&rft.atitle=Optical+recognition+of+Braille+using+standard+equipment&rft.volume=2&rft.issue=4&rft.pages=207-212&rft.date=1994-12&rft_id=info%3Adoi%2F10.1109%2F86.340878&rft.issn=1063-6528&rft.aulast=Mennens&rft.aufirst=Jan&rft.au=Tichelen%2C+Luc+van&rft.au=Fran%C3%A7ois%2C+Guido&rft.au=Engelen%2C+Jan+J.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOptical+braille+recognition" class="Z3988"></span></span> </li> <li id="cite_note-Lectobraille-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-Lectobraille_2-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFDubusBenjellounDevlaminckWauquier1988" class="citation book cs1">Dubus, J.P.; Benjelloun, M.; Devlaminck, V.; Wauquier, F.; Altmayer, P. (November 1988). "Image processing techniques to perform an autonomous system to translate relief braille into black-ink, called: Lectobraille". <i>Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society</i>. Vol. 4. Engineering in Medicine and Biology Society. pp. 1584–1585. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1109%2FIEMBS.1988.94726">10.1109/IEMBS.1988.94726</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-7803-0785-8" title="Special:BookSources/978-0-7803-0785-8"><bdi>978-0-7803-0785-8</bdi></a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:57767398">57767398</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Image+processing+techniques+to+perform+an+autonomous+system+to+translate+relief+braille+into+black-ink%2C+called%3A+Lectobraille&rft.btitle=Proceedings+of+the+Annual+International+Conference+of+the+IEEE+Engineering+in+Medicine+and+Biology+Society&rft.pages=1584-1585&rft.pub=Engineering+in+Medicine+and+Biology+Society&rft.date=1988-11&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A57767398%23id-name%3DS2CID&rft_id=info%3Adoi%2F10.1109%2FIEMBS.1988.94726&rft.isbn=978-0-7803-0785-8&rft.aulast=Dubus&rft.aufirst=J.P.&rft.au=Benjelloun%2C+M.&rft.au=Devlaminck%2C+V.&rft.au=Wauquier%2C+F.&rft.au=Altmayer%2C+P.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOptical+braille+recognition" class="Z3988"></span></span> </li> <li id="cite_note-Wong-3"><span class="mw-cite-backlink">^ <a href="#cite_ref-Wong_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Wong_3-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Wong_3-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFWongAbdullaHussman2004" class="citation book cs1">Wong, Lisa; Abdulla, Waleed; Hussman, Stephan (August 2004). "A software algorithm prototype for optical recognition of embossed Braille". <i>Proceedings of the 17th International Conference on Pattern Recognition, 2004. ICPR 2004</i>. pp. 586–589. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1109%2FICPR.2004.1334316">10.1109/ICPR.2004.1334316</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-7695-2128-2" title="Special:BookSources/978-0-7695-2128-2"><bdi>978-0-7695-2128-2</bdi></a>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/1051-4651">1051-4651</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:16350406">16350406</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=A+software+algorithm+prototype+for+optical+recognition+of+embossed+Braille&rft.btitle=Proceedings+of+the+17th+International+Conference+on+Pattern+Recognition%2C+2004.+ICPR+2004&rft.pages=586-589&rft.date=2004-08&rft_id=info%3Adoi%2F10.1109%2FICPR.2004.1334316&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A16350406%23id-name%3DS2CID&rft.issn=1051-4651&rft.isbn=978-0-7695-2128-2&rft.aulast=Wong&rft.aufirst=Lisa&rft.au=Abdulla%2C+Waleed&rft.au=Hussman%2C+Stephan&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOptical+braille+recognition" class="Z3988"></span></span> </li> <li id="cite_note-Ng-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-Ng_4-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNgNgLau1999" class="citation book cs1">Ng, C.; Ng, V.; Lau, Y. (September 1999). "Regular feature extraction for recognition of Braille". <i>Proceedings Third International Conference on Computational Intelligence and Multimedia Applications. ICCIMA'99 (Cat. No.PR00300)</i>. pp. 302–306. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1109%2FICCIMA.1999.798547">10.1109/ICCIMA.1999.798547</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-7695-0300-4" title="Special:BookSources/978-0-7695-0300-4"><bdi>978-0-7695-0300-4</bdi></a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:58353838">58353838</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Regular+feature+extraction+for+recognition+of+Braille&rft.btitle=Proceedings+Third+International+Conference+on+Computational+Intelligence+and+Multimedia+Applications.+ICCIMA%2799+%28Cat.+No.PR00300%29&rft.pages=302-306&rft.date=1999-09&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A58353838%23id-name%3DS2CID&rft_id=info%3Adoi%2F10.1109%2FICCIMA.1999.798547&rft.isbn=978-0-7695-0300-4&rft.aulast=Ng&rft.aufirst=C.&rft.au=Ng%2C+V.&rft.au=Lau%2C+Y.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOptical+braille+recognition" class="Z3988"></span></span> </li> <li id="cite_note-Murray-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-Murray_5-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMurrayDias2001" class="citation book cs1">Murray, I.; Dias, T. (2001). "A portable device for optically recognizing Braille. I. Hardware development". <i>The Seventh Australian and New Zealand Intelligent Information Systems Conference, 2001</i>. pp. 302–306. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1109%2FANZIIS.2001.974063">10.1109/ANZIIS.2001.974063</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-74052-061-4" title="Special:BookSources/978-1-74052-061-4"><bdi>978-1-74052-061-4</bdi></a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:195859595">195859595</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=A+portable+device+for+optically+recognizing+Braille.+I.+Hardware+development&rft.btitle=The+Seventh+Australian+and+New+Zealand+Intelligent+Information+Systems+Conference%2C+2001&rft.pages=302-306&rft.date=2001&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A195859595%23id-name%3DS2CID&rft_id=info%3Adoi%2F10.1109%2FANZIIS.2001.974063&rft.isbn=978-1-74052-061-4&rft.aulast=Murray&rft.aufirst=I.&rft.au=Dias%2C+T.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AOptical+braille+recognition" class="Z3988"></span></span> </li> <li id="cite_note-Antonacopoulos-6"><span class="mw-cite-backlink">^ <a href="#cite_ref-Antonacopoulos_6-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Antonacopoulos_6-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFAntonacopoulosBridson,_D.2004" class="citation book cs1">Antonacopoulos, A.; Bridson, D. (2004). "A Robust Braille Recognition System". <i>Document Analysis Systems</i>. Lecture Notes in Computer Science. 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.navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Braille" title="Template:Braille"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Braille" title="Template talk:Braille"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Braille" title="Special:EditPage/Template:Braille"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Braille_⠃⠗⠁⠊⠇⠇⠑" style="font-size:114%;margin:0 4em"><a href="/wiki/Braille" title="Braille">Braille</a><span style="padding-left:0.5em;"> </span>⠃⠗⠁⠊⠇⠇⠑</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Braille cell</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/1829_braille" title="1829 braille">1829 braille</a></span></li> <li><span class="nowrap"><a href="/wiki/International_uniformity_of_braille_alphabets" title="International uniformity of braille alphabets">International uniformity</a></span></li> <li><span class="nowrap"><a href="/wiki/Braille_ASCII" title="Braille ASCII">ASCII braille</a></span></li> <li><span class="nowrap"><a href="/wiki/Braille_Patterns" title="Braille Patterns">Unicode braille patterns</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Braille scripts</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Category:French-ordered_braille_alphabets" title="Category:French-ordered braille alphabets">French-ordered</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Albanian_Braille" title="Albanian Braille">Albanian</a></span></li> <li><span class="nowrap"><a href="/wiki/Azeri_Braille" class="mw-redirect" title="Azeri Braille">Azerbaijani</a></span></li> <li><span class="nowrap"><a href="/wiki/Cantonese_Braille" title="Cantonese Braille">Cantonese</a></span></li> <li><span class="nowrap"><a href="/wiki/Catalan_Braille" title="Catalan Braille">Catalan</a></span></li> <li><span class="nowrap"><a href="/wiki/Mainland_Chinese_Braille" title="Mainland Chinese Braille">Chinese (mainland Mandarin)</a> (largely reassigned)</span></li> <li><span class="nowrap"><a href="/wiki/Czech_Braille" title="Czech Braille">Czech</a></span></li> <li><span class="nowrap"><a href="/wiki/Dutch_Braille" title="Dutch Braille">Dutch</a></span></li> <li><span class="nowrap"><a href="/wiki/English_Braille" title="English Braille">English</a> (<a href="/wiki/Unified_English_Braille" title="Unified English Braille">Unified English</a>)</span></li> <li><span class="nowrap"><a href="/wiki/Esperanto_Braille" title="Esperanto Braille">Esperanto</a></span></li> <li><span class="nowrap"><a href="/wiki/French_Braille" title="French Braille">French</a></span></li> <li><span class="nowrap"><a href="/wiki/German_Braille" title="German Braille">German</a></span></li> <li><span class="nowrap"><a href="/wiki/Ghanaian_braille" title="Ghanaian braille">Ghanaian</a></span></li> <li><span class="nowrap"><a href="/wiki/Guarani_Braille" title="Guarani Braille">Guarani</a></span></li> <li><span class="nowrap"><a href="/wiki/Hawaiian_Braille" title="Hawaiian Braille">Hawaiian</a></span></li> <li><span class="nowrap"><a href="/wiki/Hungarian_Braille" title="Hungarian Braille">Hungarian</a></span></li> <li><span class="nowrap"><a href="/wiki/I%C3%B1upiaq_Braille" title="Iñupiaq Braille">Iñupiaq</a></span></li> <li><span class="nowrap"><a href="/wiki/IPA_Braille" title="IPA Braille">IPA</a></span></li> <li><span class="nowrap"><a href="/wiki/Irish_Braille" title="Irish Braille">Irish</a></span></li> <li><span class="nowrap"><a href="/wiki/Italian_Braille" title="Italian Braille">Italian</a></span></li> <li><span class="nowrap"><a href="/wiki/Latvian_Braille" title="Latvian Braille">Latvian</a></span></li> <li><span class="nowrap"><a href="/wiki/Lithuanian_Braille" title="Lithuanian Braille">Lithuanian</a></span></li> <li><span class="nowrap"><a href="/wiki/Luxembourgish_Braille" title="Luxembourgish Braille">Luxembourgish</a> (extended to 8-dot)</span></li> <li><span class="nowrap"><a href="/wiki/Maltese_Braille" title="Maltese Braille">Maltese</a></span></li> <li><span class="nowrap"><a href="/wiki/M%C4%81ori_Braille" title="Māori Braille">Māori</a></span></li> <li><span class="nowrap"><a href="/wiki/Navajo_Braille" title="Navajo Braille">Navajo</a></span></li> <li><span class="nowrap"><a href="/wiki/Nigerian_braille" title="Nigerian braille">Nigerian</a></span></li> <li><span class="nowrap"><a href="/wiki/Philippine_Braille" title="Philippine Braille">Philippine</a></span></li> <li><span class="nowrap"><a href="/wiki/Polish_Braille" title="Polish Braille">Polish</a></span></li> <li><span class="nowrap"><a href="/wiki/Portuguese_Braille" title="Portuguese Braille">Portuguese</a></span></li> <li><span class="nowrap"><a href="/wiki/Romanian_Braille" title="Romanian Braille">Romanian</a></span></li> <li><span class="nowrap"><a href="/wiki/Samoan_Braille" title="Samoan Braille">Samoan</a></span></li> <li><span class="nowrap"><a href="/wiki/Slovak_Braille" title="Slovak Braille">Slovak</a></span></li> <li><span class="nowrap"><a href="/wiki/South_African_braille" title="South African braille">South African</a></span></li> <li><span class="nowrap"><a href="/wiki/Spanish_Braille" title="Spanish Braille">Spanish</a></span></li> <li><span class="nowrap"><a href="/wiki/Taiwanese_Braille" title="Taiwanese Braille">Taiwanese Mandarin</a> (largely reassigned)</span></li> <li><span class="nowrap"><a href="/wiki/Turkish_Braille" title="Turkish Braille">Turkish</a></span></li> <li><span class="nowrap"><a href="/wiki/Vietnamese_Braille" title="Vietnamese Braille">Vietnamese</a></span></li> <li><span class="nowrap"><a href="/wiki/Welsh_Braille" title="Welsh Braille">Welsh</a></span></li> <li><span class="nowrap"><a href="/wiki/Yugoslav_Braille" title="Yugoslav Braille">Yugoslav</a></span></li> <li><span class="nowrap"><a href="/wiki/Zambian_Braille" title="Zambian Braille">Zambian</a></span></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Nordic family</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Estonian_Braille" title="Estonian Braille">Estonian</a></span></li> <li><span class="nowrap"><a href="/wiki/Faroese_Braille" title="Faroese Braille">Faroese</a></span></li> <li><span class="nowrap"><a href="/wiki/Icelandic_Braille" title="Icelandic Braille">Icelandic</a></span></li> <li><span class="nowrap"><a href="/wiki/Scandinavian_Braille" title="Scandinavian Braille">Scandinavian</a></span> <ul><li><span class="nowrap">Danish</span></li> <li><span class="nowrap">Finnish</span></li> <li><span class="nowrap">Greenlandic</span></li> <li><span class="nowrap"><a href="/wiki/Northern_S%C3%A1mi_Braille" title="Northern Sámi Braille">Northern Sámi</a></span></li> <li><span class="nowrap">Norwegian</span></li> <li><span class="nowrap">Swedish</span></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Russian lineage family<br />i.e. <a href="/wiki/Cyrillic_alphabets" title="Cyrillic alphabets">Cyrillic</a>-mediated scripts</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Belarusian_Braille" title="Belarusian Braille">Belarusian</a></span></li> <li><span class="nowrap"><a href="/wiki/Bulgarian_Braille" title="Bulgarian Braille">Bulgarian</a></span></li> <li><span class="nowrap"><a href="/wiki/Kazakh_Braille" title="Kazakh Braille">Kazakh</a></span></li> <li><span class="nowrap"><a href="/wiki/Kyrgyz_Braille" title="Kyrgyz Braille">Kyrgyz</a></span></li> <li><span class="nowrap"><a href="/wiki/Mongolian_Braille" title="Mongolian Braille">Mongolian</a></span></li> <li><span class="nowrap"><a href="/wiki/Russian_Braille" title="Russian Braille">Russian</a></span></li> <li><span class="nowrap"><a href="/wiki/Tatar_Braille" title="Tatar Braille">Tatar</a></span></li> <li><span class="nowrap"><a href="/wiki/Ukrainian_Braille" title="Ukrainian Braille">Ukrainian</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Egyptian lineage family<br />i.e. <a href="/wiki/Arabic_script" title="Arabic script">Arabic</a>-mediated scripts</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Arabic_Braille" title="Arabic Braille">Arabic</a></span></li> <li><span class="nowrap"><a href="/wiki/Persian_Braille" title="Persian Braille">Persian</a></span></li> <li><span class="nowrap"><a href="/wiki/Urdu_Braille" title="Urdu Braille">Urdu</a> (Pakistan)</span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Indian lineage family<br />i.e. <a href="/wiki/Bharati_Braille" title="Bharati Braille">Bharati Braille</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Devanagari_Braille" title="Devanagari Braille">Devanagari (Hindi / Marathi / Nepali)</a></span></li> <li><span class="nowrap"><a href="/wiki/Bengali_Braille" title="Bengali Braille">Bengali (Bangla / Assamese)</a></span></li> <li><span class="nowrap"><a href="/wiki/Gujarati_Braille" title="Gujarati Braille">Gujarati</a></span></li> <li><span class="nowrap"><a href="/wiki/Kannada_Braille" title="Kannada Braille">Kannada</a></span></li> <li><span class="nowrap"><a href="/wiki/Malayalam_Braille" title="Malayalam Braille">Malayalam</a></span></li> <li><span class="nowrap"><a href="/wiki/Odia_Braille" title="Odia Braille">Odia</a></span></li> <li><span class="nowrap"><a href="/wiki/Punjabi_Braille" title="Punjabi Braille">Punjabi</a></span></li> <li><span class="nowrap"><a href="/wiki/Sinhala_Braille" title="Sinhala Braille">Sinhala</a></span></li> <li><span class="nowrap"><a href="/wiki/Tamil_Braille" title="Tamil Braille">Tamil</a></span></li> <li><span class="nowrap"><a href="/wiki/Telugu_Braille" title="Telugu Braille">Telugu</a></span></li> <li><span class="nowrap"><a href="/wiki/Urdu_Braille" title="Urdu Braille">Urdu</a> (India)</span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other scripts</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Ge%27ez_Braille" class="mw-redirect" title="Ge'ez Braille">Amharic</a></span></li> <li><span class="nowrap"><a href="/wiki/Armenian_Braille" title="Armenian Braille">Armenian</a></span></li> <li><span class="nowrap"><a href="/wiki/Burmese_Braille" title="Burmese Braille">Burmese</a></span></li> <li><span class="nowrap"><a href="/wiki/Dzongkha_Braille" title="Dzongkha Braille">Dzongkha</a> (Bhutanese)</span></li> <li><span class="nowrap"><a href="/wiki/Georgian_Braille" title="Georgian Braille">Georgian</a></span></li> <li><span class="nowrap"><a href="/wiki/Greek_Braille" title="Greek Braille">Greek</a></span></li> <li><span class="nowrap"><a href="/wiki/Hebrew_Braille" title="Hebrew Braille">Hebrew</a></span></li> <li><span class="nowrap"><a href="/wiki/Inuktitut_Braille" title="Inuktitut Braille">Inuktitut</a> (reassigned vowels)</span></li> <li><span class="nowrap"><a href="/wiki/Khmer_Braille" title="Khmer Braille">Khmer</a></span></li> <li><span class="nowrap"><a href="/wiki/Thai_and_Lao_Braille" title="Thai and Lao Braille">Thai and Lao</a> (Japanese vowels)</span></li> <li><span class="nowrap"><a href="/wiki/Tibetan_Braille" title="Tibetan Braille">Tibetan</a></span></li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Reordered</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Algerian_Braille" title="Algerian Braille">Algerian Braille</a> (obsolete)</span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Frequency-based</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/American_Braille" title="American Braille">American Braille</a> (obsolete)</span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Independent</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap">Chinese semi-syllabaries</span> <ul><li><span class="nowrap"><a href="/wiki/Cantonese_Braille" title="Cantonese Braille">Cantonese</a></span></li> <li><span class="nowrap"><a href="/wiki/Mainland_Chinese_Braille" title="Mainland Chinese Braille">Mainland Chinese Mandarin</a></span></li> <li><span class="nowrap"><a href="/wiki/Taiwanese_Braille" title="Taiwanese Braille">Taiwanese Mandarin</a></span></li> <li><span class="nowrap"><a href="/wiki/Two-cell_Chinese_Braille" title="Two-cell Chinese Braille">Two-cell Chinese (Shuangpin)</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Japanese_Braille" title="Japanese Braille">Japanese</a></span></li> <li><span class="nowrap"><a href="/wiki/Korean_Braille" title="Korean Braille">Korean</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Eight-dot</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Luxembourgish_Braille" title="Luxembourgish Braille">Luxembourgish</a></span></li> <li><span class="nowrap"><a href="/wiki/Braille_kanji" title="Braille kanji">Kanji</a></span></li> <li><span class="nowrap"><a href="/wiki/Gardner%E2%80%93Salinas_braille_codes" title="Gardner–Salinas braille codes">Gardner–Salinas braille codes</a> (GS8)</span></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Symbols in braille</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Braille_music" title="Braille music">Braille music</a></span></li> <li><span class="nowrap"><a href="/wiki/Canadian_currency_tactile_feature" title="Canadian currency tactile feature">Canadian currency marks</a></span></li> <li><span class="nowrap"><a href="/wiki/Computer_Braille_Code" title="Computer Braille Code">Computer Braille Code</a></span></li> <li><span class="nowrap"><a href="/wiki/Gardner%E2%80%93Salinas_braille_codes" title="Gardner–Salinas braille codes">Gardner–Salinas braille codes</a> (science; GS8/GS6)</span></li> <li><span class="nowrap"><a href="/wiki/IPA_Braille" title="IPA Braille">International Phonetic Alphabet (IPA)</a></span></li> <li><span class="nowrap"><a href="/wiki/Nemeth_Braille" title="Nemeth Braille">Nemeth braille code</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Braille_technology" title="Braille technology">Braille technology</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Braille_e-book" title="Braille e-book">Braille e-book</a></span></li> <li><span class="nowrap"><a href="/wiki/Braille_embosser" title="Braille embosser">Braille embosser</a></span></li> <li><span class="nowrap"><a href="/wiki/Braille_translator" title="Braille translator">Braille translator</a></span></li> <li><span class="nowrap"><a href="/wiki/Braille_watch" title="Braille watch">Braille watch</a></span></li> <li><span class="nowrap"><a href="/wiki/Mountbatten_Brailler" title="Mountbatten Brailler">Mountbatten Brailler</a></span></li> <li><span class="nowrap"><a class="mw-selflink selflink">Optical braille recognition</a></span></li> <li><span class="nowrap"><a href="/wiki/Perforation" title="Perforation">Perforation</a></span></li> <li><span class="nowrap"><a href="/wiki/Perkins_Brailler" title="Perkins Brailler">Perkins Brailler</a></span></li> <li><span class="nowrap"><a href="/wiki/Refreshable_braille_display" title="Refreshable braille display">Refreshable braille display</a></span></li> <li><span class="nowrap"><a href="/wiki/Slate_and_stylus" title="Slate and stylus">Slate and stylus</a></span></li> <li><span class="nowrap"><a href="/wiki/Braigo" title="Braigo">Braigo</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">People</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Louis_Braille" title="Louis Braille">Louis Braille</a></span></li> <li><span class="nowrap"><a href="/wiki/Charles_Barbier" title="Charles Barbier">Charles Barbier</a></span></li> <li><span class="nowrap"><a href="/wiki/R%C3%B3%C5%BCa_Czacka" title="Róża Czacka">Róża Czacka</a></span></li> <li><span class="nowrap"><a href="/wiki/Valentin_Ha%C3%BCy" title="Valentin Haüy">Valentin Haüy</a></span></li> <li><span class="nowrap"><a href="/wiki/Harris_Mowbray" title="Harris Mowbray">Harris Mowbray</a></span></li> <li><span class="nowrap"><a href="/wiki/Thakur_Vishva_Narain_Singh" title="Thakur Vishva Narain Singh">Thakur Vishva Narain Singh</a></span></li> <li><span class="nowrap"><a href="/wiki/Sabriye_Tenberken" title="Sabriye Tenberken">Sabriye Tenberken</a></span></li> <li><span class="nowrap"><a href="/wiki/William_Bell_Wait" title="William Bell Wait">William Bell Wait</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Organisations</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Braille_Institute_of_America" title="Braille Institute of America">Braille Institute of America</a></span></li> <li><span class="nowrap"><a href="/wiki/Braille_Without_Borders" title="Braille Without Borders">Braille Without Borders</a></span></li> <li><span class="nowrap"><a href="/wiki/Japan_Braille_Library" title="Japan Braille Library">Japan Braille Library</a></span></li> <li><span class="nowrap"><a href="/wiki/National_Braille_Association" title="National Braille Association">National Braille Association</a></span></li> <li><span class="nowrap"><a href="/wiki/Category:Blindness_organizations" title="Category:Blindness organizations">Blindness organizations</a></span></li> <li><span class="nowrap"><a href="/wiki/Category:Schools_for_the_blind" title="Category:Schools for the blind">Schools for the blind</a></span></li> <li><span class="nowrap"><a href="/wiki/American_Printing_House_for_the_Blind" title="American Printing House for the Blind">American Printing House for the Blind</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other <a href="/wiki/Tactile_alphabet" title="Tactile alphabet">tactile alphabets</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> 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