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git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@154 d0cd1f9f-072b-0410-8dd7-cf729c803f20
193 lines
8.4 KiB
Plaintext
193 lines
8.4 KiB
Plaintext
Tesseract release notes January 23 2008 - V2.02
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Improvements to clustering, training and classifier.
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Major internationalization improvements for large-character-set
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languages, eg Kannada.
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Removed some compiler warnings.
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Added multipage tiff support for training and running.
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Updated graphics output to talk to new java-based viewer.
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Added ability to save n-best lists.
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Added leptonica support for more file types.
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Improved Init/End to make them safe.
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Reduced memory use of dictionaries.
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Added some new APIs to TessBaseAPI.
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Tesseract release notes August 27 2007 - V2.01
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Fixed UTF8 input problems with box file reader.
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Fixed various infinite loops and crashes in dawg code.
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Removed include of config_auto.h from host.h.
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Added automatic wctype encoding to unicharset_extractor.
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Fixed dawg table too full error.
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Removed svn files from tarball.
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Added new functions to tessdll.
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Increased maximum utf8 string in a classification result to 8.
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Tesseract release notes July 17, 2007 - V2.00
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First release of the International version.
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This version recognizes the following languages:
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English - eng
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French - fra
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Italian - ita
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German - deu
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Spanish - spa
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Dutch - nld
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The language codes follow ISO 639-2. The default language is English.
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To recognize another language:
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tesseract inputimage outputbase -l langcode
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To train on a new language, see separate documentation.
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More languages will be appearing over time.
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List of changes in this release:
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Converted internal character handling to UTF8.
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Trained with 6 languages.
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Added unicharset_extractor, wordlist2dawg.
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Added boxfile creation mode.
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Added UNLV regression test capability.
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Fixed problems with copyright and registered symbols.
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Fixed extern "C" declarations problem.
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Made some improvements to consistency of accuracy across platforms.
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Added vc++ express support.
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Instructions for downloading and building version 2.00.
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Things have changed quite a bit since the previous versions so please read carefully.
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*All users*
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The tarballs are split into pieces.
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tesseract-2.00.tar.gz contains all the source code.
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tesseract-2.00.<lang>.tar.gt contains the data files for <lang>. You need at least one of these or tesseract will not work.
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tesseract-2.00.exe.tar.gz is not for the 'exe' language. It is windows executables. They are built with VC++ express and come with absolutely no warranty. If they work for you then great, otherwise get visual C++ express (and the platform sdk) and build from the source.
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*Non-windows users*
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As with 1.04, this version works with make install.
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*New* there is a tesseract.spec for making rpms. (Thanks to Andrew Ziem for the help.)
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It might work with your OS if you know how to do that sort of thing.
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If you are linking to the libraries, as with Ocropus, there is now a single master
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library called libtesseract_full.a.
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*Windows users*
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If you are building from the sources, there are still dsw and dsp files for vc++6 and also
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sln and vcproj files for vc++ express.
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The dll has been updated to allow input of non-binary images. (Thanks to Glen of Jetsoft.)
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Tesseract release notes May 15, 2007 - V1.04.
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=== Windows users only ===
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Added a dll interface for windows. Thanks to Glen at Jetsoft for contributing
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this. To use the dll, include tessdll.h, import tessdll.lib and put tessdll.dll
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somewhere where the system can find it. There is also a small dlltest program
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to test the dll. Run with:
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dlltest phototest.tif phototest.txt
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It will output the text from phototest.tif with bounding box information.
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**New for Windows** the distribution now includes tesseract.exe and tessdll.dll
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which *might* work out of the box! There are no guarantees as you need
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VC++6 versions of mfc and crt (at least) for it to work. (Batteries not
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included, and certainly no installshield.)
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== Important note for anyone building with make: i.e. anyone except devstudio
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users ==
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This release includes new standardization for the data directory. To enable
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Tesseract to find its data files, you must either:
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./configure
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make
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make install
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to move the data files to the standard place, or:
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export TESSDATA_PREFIX="directory in which your tessdata resides/"
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(or equivalent) in your .profile or whatever or setenv to set the environment
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variable. Note that the directory must end in a /
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HAVING tesseract and tessdata IN THE SAME DIRECTORY DOES NOT WORK ANY MORE.
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== All users ==
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Fixed a bunch of name collisions - mostly with stl.
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Made some preliminary changes for unicode compatibility. Includes a new data
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file (unicharset) and renaming of the other data files to eng.* to support
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different languages.
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There are also several other minor bug fixes and portability improvements
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for 64 bit, the latest visual studio compiler etc. Thanks to all who have
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contributed these fixes.
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NOTE: This is likely to be the last English-only release!
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Apologies in advance to non-windows users for bloating the distribution with
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windows executables. This will probably get fixed in the next release with
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the multi-language capability, since that will also bloat the distribution.
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Tesseract release notes Feb 2, 2007 - V1.03.
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Added mftraining and cntraining. Using an image with a box file, tesseract
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generates .tr output files. cntraining runs on the .tr files to make
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normproto that lives in tessdata. mftraining runs on the .tr files to
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make inttemp and pffmtable in tessdata. These are the main data files
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that tesseract uses to recognize characters. At present, the code to make
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dictionary files is not yet available, nor are any sample box files or
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rebuilt inttemp or documentation to create any of these. Recognition is
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still limited to the ASCII set, but when this problem is fixed, documentation
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will follow.
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Added a new API with adaptive thresholding for grey and color images.
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See ccmain/baseapi.h/cpp for details. The main program has been converted
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to use the API as an example. See main() in ccmain/tesseractmain.cpp for
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details. The API is designed to make it easy to add subclasses with ability
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to output the bounding boxes etc from the internal structures. The adaptive
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thresholding improves accuracy (most of the time) on non-binary images.
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Many memory leaks have been fixed. There are no known leaks left from using
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the API correctly.
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The adaptive classifier was not operating correctly. This bug, and several
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others have been fixed, including poor chopping, an indefinite (if not quite
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infinite) loop in the number parser, and a couple of crash bugs. Thanks to
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all that have contributed bugs and bug fixes.
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It is now possible to build without any of the graphics support to save code
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size using #define GRAPHICS_DISABLED. There is also a new EMBEDDED define
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for use on operating systems with limited library support.
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64-bit and Mac OSX buildability is now included in the mainline source tree.
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Thanks to all that have contributed patches and comments to help with that.
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1.03 is also endian-independent, apart from the tiff i/o, so if you use
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libtiff, the code should run on all platforms, even if you get/create new
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data files of a different endinanness.
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Some of the bug fixes improve accuracy, and so do some of the changes to
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DangAmbigs and user-words.
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Tesseract release notes, Oct 4 2006 - V1.02.
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Removed dependency on aspirin. *All* code is now licensed under Apache2.0.
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Tesseract release notes, Sep 7 2006 - V1.01.
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Fixes for this release:
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Added mfcpch.cpp and getopt.cpp for VC++.
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Fixed problem with greyscale images and no libtiff.
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Stopped debug window from being used for the usage output.
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Fixed load of inttemp for big-endian architectures.
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Fixed some Mac compilation issues.
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This version should read uncompressed 8 bit grey and 24 bit color tiffs
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without having to have libtiff. It does a dumb threshold though, so don't
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expect good results from poor contrast or images of natural scenes etc.
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If you just run tesseract with no command line args you should now get a
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sensible usage message on linux, with or without X-windows.
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If you can get it to compile on a PPC Mac, it may now run correctly,
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although not all the build issues are fixed yet.
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Building Tesseract:
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Windows:
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Unpack the tar.gz archive
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Open tesseract.dsw in DevStudio (preferably version 6, higher versions will be more difficult)
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Set Win32 - Release as the active configuration.
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Build.
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Copy tesseract.exe from bin.rel up one directory level.
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Run tesseract phototest.tif phototest
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This will create phototest.txt.
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Linux:
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Unpack the tar.gz archive
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./configure
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make
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Copy tesseract from ccmain up one directory level (or create a symbolic link)
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Run tesseract phototest.tif phototest
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This will create phototest.txt.
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