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Insert a drive or CD containing your preferred OS. When starting up your Mac, hold down the button that gives you boot options. This could either be the 'C' key, 'F12' or 'F8'. Boot the CD or USB Drive with the new OS install on it and continue from there. The Mac Pro is a series of workstations and servers for professionals designed, manufactured, and sold by Apple Inc. The Mac Pro, by some performance benchmarks, is the most powerful computer that Apple offers.

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]

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 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]

On November 2020, Brewster Kahle from the Internet Archive praised Tesseract saying:^[19]

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.

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.
19. ^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]

• 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.

The only way users can access ARGO is via SSH remote login to the host argo.orc.gmu.edu with their GMU netID and password. This provides users with a UNIX shell on one of ARGO's head nodes. Currently, users DO NOT need to use VPN to connect to GMU's internal networks in order to access the cluster. Users will be logged in to either one of the head nodes in a round robin manner depending on the system load.

Once the user has logged in, they can schedule jobs on the cluster via the SLURM resource manager. The nodes themselves should not be accessed directly -- all commands to the nodes are issued through the SLURM.

If you don't have access, see Getting an ARGO Account.

Connecting from a MAC, Linux or Windows 10 machine

To log in to ARGO user can give the following command on their terminal:

where your-gmu-user-id is your GMU netID. Users can use either of -X or -Y (recommended) option to forward X11 so they can use the X-Window gui during their session. The main difference between these options are that the latter uses a more secure protocol. For detailson how these and other options work, you can visit the ssh manual page: SSH manual.

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Once the user have entered the above command they will be asked for their GMU patriot password. Once they type in their password they will be logged in to one of the ARGO cluster head nodes (argo1 or argo2).

Connecting from a Windows 7 or older system

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Users can start a terminal session using PuTTY and follow the instructions given above. They may get a warningregarding the authenticity of the host when logging in for the first time. If this happens the user should click continue and ignorethe warning.

PuTTY can be downloaded from http://www.putty.org.

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