Open Source Ocr Software Mac Os X

Posted on  by

Tesseract
Tesseract 3.02 running on Gnome Terminal 3.8.0. 'input_image.tif' is the input document which will be rendered as 'output_text.txt' by Tesseract.
Original author(s)Ray Smith, Hewlett-Packard[1]
Developer(s)Google
Stable release
Repository
Written inC and C++
Operating systemLinux, Windows, and macOS (x86)
Available inInterface: 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, 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 (more can be added using included training files)
TypeOptical character recognition
LicenseApache License v2.0
Websitegithub.com/tesseract-ocr

Tesseract is an optical character recognition engine for various operating systems.[3] It is free software, released under the Apache License.[1][4][5] 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.[6]

  1. Top 5 Free scanning software for Mac. Part 3 3) VueScan: Functions and Specifications: A yet another scanning software that is listed under the category of top free scanning software for Macis VueScan. This software is compatible with over 2800 different types of scanners that are operated on Windows, OS X.
  2. Process batches of documents and automate conversion tasks with FineReader Pro for Mac – world-leading OCR and PDF conversion software. Achieve new levels of productivity when converting documents with support for Automator actions and AppleScript commands.

OCRKit is a simple and streamlined Mac application, that features the advanced Optical Character Recognition technology, allowing you to convert scanned or printed documents into searchable and editable text. This is particularly useful for PDF documents received via e.

In 2006, Tesseract was considered one of the most accurate open-source OCR engines then available.[5][7]

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 some 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.[4] 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.[6]

Features[edit]

Tesseract was in the top three OCR engines in terms of character accuracy in 1995.[8] 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.[4][5]

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[9] 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.[5]

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).[10]

In addition Tesseract can be trained to work in other languages.[5]

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.[11]

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.[12]

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,[13] 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.[14]

Version 4[edit]

Version 4 adds LSTM based OCR engine and models for many additional languages and scripts, bringing the total to 116 languages.[15]

Additionally scripts for 37 languages are supported so it is possible to recognize a language by using the script it is written in.

User interfaces[edit]

Tesseract configuration window in OCRFeeder

Tesseract is executed from the command-line interface.[16] While Tesseract is not supplied with a GUI, there are many separate projects which provide a GUI for it.[17] One common example is OCRFeeder.[18]

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.'[3]

See also[edit]

References[edit]

  1. ^ abGoogle (2008). 'tesseract-ocr'. Retrieved 2016-03-08.
  2. ^'Releases - tesseract-ocr/tesseract'. Retrieved 5 January 2020 – via GitHub.
  3. ^ abKay, Anthony (July 2007). 'Tesseract: an Open-Source Optical Character Recognition Engine'. Linux Journal. Retrieved 28 September 2011.
  4. ^ abcVincent, Luc (August 2006). 'Announcing Tesseract OCR'. Archived from the original on October 26, 2006. Retrieved 2008-06-26.
  5. ^ abcdeCanonical Ltd. (February 2011). 'OCR'. Retrieved 2011-02-11.
  6. ^ abAnnouncing Tesseract OCR - The official Google blog
  7. ^Willis, Nathan (September 2006). 'Google's Tesseract OCR engine is a quantum leap forward'. Retrieved 2008-07-18.
  8. ^Rice Stephen V., Frank R. Jenkins, and Thomas A. Nartker The Fourth Annual Test of OCR Accuracy, expervision.com, retrieved 21 May 2013
  9. ^Tesseract Project (February 2011). 'Issue 263: patch to enable hOCR output'. Archived from the original on November 13, 2012. Retrieved 26 February 2011.
  10. ^'langdata - Source training data for Tesseract for lots of languages'. Retrieved 6 November 2016.
  11. ^'Training LSTM networks on 100 languages and test results'(PDF). Retrieved 18 March 2018.
  12. ^Announcing the OCRopus Open Source OCR System (Thomas Breuel, OCRopus Project Leader).
  13. ^'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.
  14. ^'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.
  15. ^'TESSERACT(1) Manual Page'. Retrieved 15 March 2018.
  16. ^Google Code – Tesseract Readme
  17. ^'3rdParty - tesseract-ocr - GUIs and Other Projects using Tesseract OCR'. github.com. Retrieved 2017-03-30.
  18. ^'OCRFeeder'. GNOME wiki. Retrieved 12 January 2019.

External links[edit]

Wikimedia Commons has media related to Tesseract (software).
  • Hacking Tesseract V0.04 – C/C++ structure of Tesseract extracted from Doxyfied source code (based on Tesseract V1.03)
  • Tesseract OCR Engine An Overview of the Tesseract OCR Engine.
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Tesseract_(software)&oldid=967096061'

Part 1

1) ExactScan

Features and Functions:

· Launched by ExactCode, EcaxtScan is one of the most popularfree scanning software for Mac.

· It has a built in capacity to store and scan over 200 documents. Running on Mac OS X this software enables you to scan the required document through a fingertip or through directly pressing a remote button of your scanner.

· One of the striking features about this scanning software is that it can support almost all the scanners out there in the market.

Pros of ExactScan:

· ExactScan enables its users to setup different profiles for the different users after scanning.

· Available as a free scanning software for Mac, it has an ability to support 150 different types of scanners.

· The installation size of this software is relatively small as compared to other scanning software for Mac.

Ocr On Mac

Cons of ExactScan:

· Some old scanners can’t be supported.

· Sometimes there is a problem of software crashing in the middle of scanning operation.

· If the software becomes outdated, the scanning process becomes slow.

Reviews:

· The content looks better and professional after the scanning. It is extremely fast and a useful scanning software.

li_x_nk:http://download.cnet.com/ExactScan/3000-2118_4-10864138.html

Free Ocr Mac

· This software has all the drivers included that are needed for scanning. A perfect choice for all kinds of scanning purposes in Mac.

Open source ocr software mac os x download

Open Source Ocr Software Mac Os X Download

li_x_nk:http://download.cnet.com/ExactScan/3000-2118_4-10864138.html

· It has excellent accuracy and is available totally free of cost. Highly user friendly interface enables easy scanning of the documents,

li_x_nk: http://download.cnet.com/ExactScan/3000-2118_4-10864138.html