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tesseract software wikipedia 405 captures 13 sep 2006 21 sep 2026 nov dec jan 18 2021 2022 2023 success fail about this capture timestamps the wayback machine http web archive org web 20221218201246 https en wikipedia org wiki tesseract_ software tesseract software from wikipedia the free encyclopedia jump to navigation jump to search free optical character recognition engine tesseract tesseract 4 1 1 reading an image original author s ray smith hewlett packard 1 developer s google and others stable release 5 2 0 2 6 july 2022 repository github com tesseract ocr tesseract written in c and c operating system linux windows and macos available in interface english recognition afrikaans albanian arabic azerbaijani basque belarusian bengali bulgarian catalan czech cherokee croatian danish dutch english esperanto estonian finnish french galician german greek hindi hebrew hungarian indonesian italian japanese kannada korean latvian lithuanian malayalam macedonian maltese malay norwegian polish portuguese romanian russian serbian slovak slovenian spanish swahili swedish tagalog tamil telugu thai turkish ukrainian vietnamese 3 more can be added using included training files 4 type optical character recognition license apache license 2 0 website github com tesseract ocr tesseract is an optical character recognition engine for various operating systems 5 it is free software released under the apache license 1 6 7 originally developed by hewlett packard as proprietary software in the 1980s it was released as open source in 2005 and development has been sponsored by google since 2006 8 in 2006 tesseract was considered one of the most accurate open source ocr engines available 7 9 contents 1 history 2 features 3 user interfaces 4 reception 5 see also 6 references 7 external links history edit the tesseract engine was originally developed as proprietary software at hewlett packard labs in bristol england and greeley colorado between 1985 and 1994 with more changes made in 1996 to port to windows and some migration from c to c in 1998 a lot of the code was written in c and then some more was written in c since then all the code has been converted to at least compile with a c compiler 6 very little work was done in the following decade it was then released as open source in 2005 by hewlett packard and the university of nevada las vegas unlv tesseract development has been sponsored by google since 2006 8 version 4 adds lstm based ocr engine and models for many additional languages and scripts bringing the total to 116 languages 10 additionally 37 scripts are supported so it is for example possible to recognize text with a mix of western and central european languages by using the model for the latin script it is written in citation needed version 5 was released in 2021 after more than two years of testing and developing 11 features edit tesseract was in the top three ocr engines in terms of character accuracy in 1995 12 it is available for linux windows and mac os x however due to limited resources it is only rigorously tested by developers under windows and ubuntu 6 7 tesseract up to and including version 2 could only accept tiff images of simple one column text as inputs these early versions did not include layout analysis and so inputting multi columned text images or equations produced garbled output since version 3 00 tesseract has supported output text formatting hocr 13 positional information and page layout analysis support for a number of new image formats was added using the leptonica library tesseract can detect whether text is monospaced or proportionally spaced 7 the initial versions of tesseract could only recognize english language text tesseract v2 added six additional western languages french italian german spanish brazilian portuguese dutch version 3 extended language support significantly to include ideographic chinese japanese and right to left e g arabic hebrew languages as well as many more scripts new languages included arabic bulgarian catalan chinese simplified and traditional croatian czech danish german fraktur script greek finnish hebrew hindi hungarian indonesian japanese korean latvian lithuanian norwegian polish portuguese romanian russian serbian slovak standard and fraktur script slovenian swedish tagalog tamil thai turkish ukrainian and vietnamese v3 04 released in july 2015 added an additional 39 language script combinations bringing the total count of support languages to over 100 new language codes included amh amharic asm assamese aze_cyrl azerbaijana in cyrillic script bod tibetan bos bosnian ceb cebuano cym welsh dzo dzongkha fas persian gle irish guj gujarati hat haitian and haitian creole iku inuktitut jav javanese kat georgian kat_old old georgian kaz kazakh khm central khmer kir kyrgyz kur kurdish lao lao lat latin mar marathi mya burmese nep nepali ori oriya pan punjabi pus pashto san sanskrit sin sinhala srp_latn serbian in latin script syr syriac tgk tajik tir tigrinya uig uyghur urd urdu uzb uzbek uzb_cyrl uzbek in cyrillic script yid yiddish 14 in addition tesseract can be trained to work in other languages 7 tesseract can process right to left text such as arabic or hebrew many indic scripts as well as cjk quite well accuracy rates are shown in this presentation for tesseract tutorial at das 2016 santorini by ray smith 15 tesseract is suitable for use as a backend and can be used for more complicated ocr tasks including layout analysis by using a frontend such as ocropus 16 tesseract s output will have very poor quality if the input images are not preprocessed to suit it images especially screenshots must be scaled up such that the text x height is at least 20 pixels 17 any rotation or skew must be corrected or no text will be recognized low frequency changes in brightness must be high pass filtered or tesseract s binarization stage will destroy much of the page and dark borders must be manually removed or they will be misinterpreted as characters 18 user interfaces edit tesseract configuration window in ocrfeeder tesseract is executed from the command line interface 19 while tesseract is not supplied with a gui there are many separate projects which provide a gui for it 20 one common example is ocrfeeder 21 reception edit in a july 2007 article on tesseract anthony kay of linux journal termed it a quirky command line tool that does an outstanding job at that time he noted tesseract is a bare bones ocr engine the build process is a little quirky and the engine needs some additional features such as layout detection but the core feature text recognition is drastically better than anything else i ve tried from the open source community it is reasonably easy to get excellent recognition rates using nothing more than a scanner and some image tools such as the gimp and netpbm 5 in november 2020 brewster kahle from the internet archive praised tesseract saying tesseract has made a major step forward in the last few years when we last evaluated the accuracy it was not as good as the proprietary ocr but that has changed we have done evaluations and it is just as good and can get better for our application because of its new architecture 22 see also edit libtiff references edit a b google 2008 tesseract ocr retrieved 2016 03 08 https github com tesseract ocr tesseract releases tag 5 2 0 languages supported in different versions of tesseract archived from the original on 8 august 2022 retrieved 2022 11 21 tesseract documentation traineddata files language data files for tesseract archived from the original on 5 september 2022 retrieved 2022 11 21 a b kay anthony july 2007 tesseract an open source optical character recognition engine linux journal retrieved 28 september 2011 a b c vincent luc august 2006 announcing tesseract ocr archived from the original on october 26 2006 retrieved 2008 06 26 a b c d e canonical ltd february 2011 ocr retrieved 2011 02 11 a b announcing tesseract ocr the official google blog willis nathan september 2006 google s tesseract ocr engine is a quantum leap forward archived from the original on 28 may 2022 retrieved 2008 07 18 tesseract 1 manual page retrieved 15 march 2018 schmidt julia 2021 12 01 ocr engine tesseract 5 0 converts to float for faster training and recognition devclass devclass retrieved 2021 12 20 rice stephen v frank r jenkins and thomas a nartker the fourth annual test of ocr accuracy expervision com retrieved 21 may 2013 tesseract project february 2011 issue 263 patch to enable hocr output archived from the original on november 13 2012 retrieved 26 february 2011 langdata source training data for tesseract for lots of languages retrieved 6 november 2016 training lstm networks on 100 languages and test results pdf retrieved 18 march 2018 announcing the ocropus open source ocr system thomas breuel ocropus project leader faq tesseract ocr frequently asked questions an ocr engine that was developed at hp labs between 1985 and 1995 and now at google google project hosting archived from the original on 23 december 2015 retrieved 2014 05 30 improvequality tesseract ocr advice on improving the quality of your output an ocr engine that was developed at hp labs between 1985 and 1995 and now at google google project hosting 2014 01 27 archived from the original on 20 september 2015 retrieved 2014 05 30 google code tesseract readme 3rdparty tesseract ocr guis and other projects using tesseract ocr github com retrieved 2017 03 30 ocrfeeder gnome wiki retrieved 12 january 2019 brewster kahle november 23 2020 foss wins again free and open source communities comes through on 19th century newspapers and books and periodicals internet archive blogs blog archive org retrieved december 1 2020 external links edit wikimedia commons has media related to tesseract software official website v t e optical character recognition software free software cuneiform gocr ocrad ocrfeeder ocropus tesseract proprietary software abbyy finereader asprise ocr microsoft office document imaging omnipage readsoft smartscore teleform vuescan see also comparison of optical character recognition software v t e google free and open source software software applications chromium openrefine tesseract programming languages carbon dart go sawzall frameworks and development tools amp angular angularjs beam bazel blockly closure tools cpplint flatbuffers flutter gears gerrit guava grpc gson guetzli guice gvisor kubernetes leveldb libvpx nacl or tools polymer protocol buffers tensorflow operating systems aosp chromium os fuchsia glinux goobuntu related code in google llc v oracle america inc open source security foundation summer of code retrieved from https en wikipedia org w index php title tesseract_ software oldid 1127639891 categories optical character recognition free software programmed in c free software programmed in c optical character recognition software hp software google software formerly proprietary software software using the apache license hidden categories articles with short description short description matches wikidata all articles with unsourced statements articles with unsourced statements from may 2022 commons category link from wikidata navigation menu personal tools not logged in talk contributions create account log in namespaces article talk english views read edit view history more navigation main page contents current events random article about wikipedia contact us donate contribute help learn to edit community portal recent changes upload file tools what links here related changes upload file special pages permanent link page information cite this page wikidata item print export download as pdf printable version in other projects wikimedia commons languages deutsch ελληνικά español فارسی français 한국어 हिन्दी bahasa indonesia italiano nederlands 日本語 português русский türkçe українська 中文 edit links this page was last edited on 15 december 2022 at 21 25 utc text is available under the creative commons attribution 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