mirror of
https://github.com/tesseract-ocr/tesseract.git
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e2b1e9f977
Since commit 245eebdf29, Tesseract 3.05
requires Leptonica 1.74, so this is not a new requirement for 4.00.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
269 lines
14 KiB
Plaintext
269 lines
14 KiB
Plaintext
2017-03-24 - V4.00.00-alpha
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* Added new neural network system based on LSTMs, with major accuracy gains.
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* Improvements to PDF rendering.
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* Fixes to trainingdata rendering.
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* Added LSTM models+lang models to 101 languages. (tessdata repository)
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* Improved multi-page TIFF handling.
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* Fixed damage to binary images when processing PDFs.
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* Fixes to training process to allow incremental training from a recognition model.
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* Made LSTM the default engine, pushed cube out.
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* Deleted cube code.
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* Changed OEModes --oem 0 for legacy tesseract engine, --oem 1 for LSTM, --oem 2 for both, --oem 3 for default.
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* Avoid use of Leptonica debug parameters or functions.
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* Fixed multi-language mode.
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* Removed support for VS2010.
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* Added Support for VS2015 and VS2017 with CPPAN.
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* Implemented invisible text only for PDF.
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* Added AVX / SSE support for Windows
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* Enabled OpenMP support.
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* Miscellaneous Fixes.
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2017-02-16 - V3.05.00
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* Made some fine tuning to the hOCR output.
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* Added TSV as another optional output format.
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* Fixed ABI break introduced in 3.04.00 with the AnalyseLayout() method.
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* text2image tool - Enable all OpenType ligatures available in a font. This feature requires Pango 1.38 or newer.
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* Training tools - Replaced asserts with tprintf() and exit(1).
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* Fixed Cygwin compatibility.
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* Improved multipage tiff processing.
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* Improved the embedded pdf font (pdf.ttf).
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* Enable selection of OCR engine mode from command line.
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* Changed tesseract command line parameter '-psm' to '--psm'.
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* Write output of tesseract --help, --version and --list-langs to stdout instead of stderr.
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* Added new C API for orientation and script detection, removed the old one.
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* Increased minimum autoconf version to 2.59.
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* Removed dead code.
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* Require Leptonica 1.74 or higher.
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* Fixed many compiler warning.
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* Fixed memory and resource leaks.
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* Fixed some issues with the 'Cube' OCR engine.
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* Fixed some openCL issues.
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* Added option to build Tesseract with CMake build system.
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* Implemented CPPAN support for easy Windows building.
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2016-02-17 - V3.04.01
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* Added OSD renderer for psm 0. Works for single page and multi-page images.
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* Improve tesstrain.sh script.
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* Simplify build and run of ScrollView.
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* Improved PDF output for OS X Preview utility.
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* INCOMPATIBLE fix to hOCR line height information - commit 134ebc3.
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* Added option to build Tesseract without Cube OCR engine (-DNO_CUBE_BUILD).
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* Enable OpenMP support.
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* Many bug fixes.
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2015-07-11 - V3.04.00
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* Tesseract development is now done with Git and hosted at github.com (Previously we used Subversion as a VCS and code.google.com for hosting).
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* Tesseract now requires leptonica 1.71 or a higher version.
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* Removed official support for VS 2008.
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* Added support for 39 additional scripts/languages, including: amh, asm, aze_cyrl, bod, bos, ceb, cym, dzo, fas, gle, guj, hat, iku, jav, kat, kat_old, kaz, khm, kir, kur, lao, lat, mar, mya, nep, ori, pan, pus, san, sin, srp_latn, syr, tgk, tir, uig, urd, uzb, uzb_cyrl, yid
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* Major updates to training system as a result of extensive testing on 100 languages.
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* New training data for over 100 languages
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* Improved performance with PIC compilation option.
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* Significant change to invisible font system in pdf output to improve correctness and compatibility with external programs, particularly ghostscript.
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* Improved font identification.
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* Major change to improve layout analysis for heavily diacritic languages: Thai, Vietnamese, Kannada, Telugu etc.
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* Fixed problems with shifted baselines so recognition can recover from layout analysis errors.
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* Major refactor to improve speed on difficult images, especially when running a heap checker.
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* Moved params from global in page layout to tesseractclass.
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* Improved single column layout analysis.
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* Allow ocr output to multiple formats using tesseract command line executable.
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* Fixed issues with mixed eng+ara scripts.
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* Improved script consistency in numbers.
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* Major refactor of control.cpp to enable line recognition.
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* Added tesstrain.sh - a master training script.
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* Added ability to text2image training tool to just list available fonts.
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* Added ability to text2image to underline words.
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* Improved efficiency of image processing for PDF output.
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* Added parameter description for each parameter listed with 'print-parameters' command line option.
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* Added font info to hOCR output.
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* Enabled streaming input and output of multi-page documents.
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* Many bug fixes.
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2014-02-04 - V3.03(rc1)
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* Added new training tool text2image to generate box/tif file pairs from
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text and truetype fonts.
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* Added support for PDF output with searchable text.
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* Removed entire IMAGE class and all code in image directory.
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* Tesseract executable: support for output to stdout; limited support for one
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page images from stdin (especially on Windows)
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* Added Renderer to API to allow document-level processing and output
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of document formats, like hOCR, PDF.
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* Major refactor of word-level recognition, beam search, eliminating dead code.
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* Refactored classifier to make it easier to add new ones.
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* Generalized feature extractor to allow feature extraction from greyscale.
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* Improved sub/superscript treatment.
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* Improved baseline fit.
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* Added set_unicharset_properties to training tools.
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* Many bug fixes.
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* More training source data included.
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2012-02-01 - V3.02
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* Moved ResultIterator/PageIterator to ccmain.
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* Added Right-to-left/Bidi capability in the output iterators for Hebrew/Arabic.
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* Added paragraph detection in layout analysis/post OCR.
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* Fixed inconsistent xheight during training and over-chopping.
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* Added simultaneous multi-language capability.
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* Refactored top-level word recognition module.
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* Added experimental equation detector.
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* Improved handling of resolution from input images.
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* Blamer module added for error analysis.
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* Cleaned up externally used namespace by removing includes from baseapi.h.
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* Removed dead memory mangagement code.
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* Tidied up constraints on control parameters.
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* Added support for ShapeTable in classifier and training.
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* Refactored class pruner.
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* Fixed training leaks and randomness.
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* Major improvements to layout analysis for better image detection, diacritic detection, better textline finding, better tabstop finding.
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* Improved line detection and removal.
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* Added fixed pitch chopper for CJK.
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* Added UNICHARSET to WERD_CHOICE to make mult-language handling easier.
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* Fixed problems with internally scaled images.
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* Added page and bbox to string in tr files to identify source of training data better.
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* Fixes to Hindi Shiroreka splitter.
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* Added word bigram correction.
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* Reduced stack memory consumption and eliminated some ugly typedefs.
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* Added new uniform classifier API.
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* Added new training error counter.
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* Fixed endian bug in dawg reader.
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* Many other fixes, including the way in which the chopper finds chops and messes with the outline while it does so.
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2010-11-29 - V3.01
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* Removed old/dead serialise/deserialze methods on *LISTIZED classes.
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* Total rewrite of DENORM to better encapsulate operation and make
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for potential to extract features from images.
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* Thread-safety! Moved all critical globals and statics to members of the appropriate class. Tesseract is now thread-safe (multiple instances can be used in parallel in multiple threads.) with the minor exception that some control parameters are still global and affect all threads.
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* Added Cube, a new recognizer for Arabic. Cube can also be used in combination with normal Tesseract for other languages with an improvement in accuracy at the cost of (much) lower speed. *There is no training module for Cube yet.*
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* `OcrEngineMode` in `Init` replaces `AccuracyVSpeed` to control cube.
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* Greatly improved segmentation search with consequent accuracy and speed improvements, especially for Chinese.
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* Added `PageIterator` and `ResultIterator` as cleaner ways to get the full results out of Tesseract, that are not currently provided by any of the `TessBaseAPI::Get*` methods. All other methods, such as the `ETEXT_STRUCT` in particular are deprecated and will be deleted in the future.
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* ApplyBoxes totally rewritten to make training easier. It can now cope with touching/overlapping training characters, and a new boxfile format allows word boxes instead of character boxes, BUT to use that you have to have already boostrapped the language with character boxes. "Cyclic dependency" on traineddata.
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* Auto orientation and script detection added to page layout analysis.
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* Deleted *lots* of dead code.
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* Fixxht module replaced with scalable data-driven module.
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* Output font characteristics accuracy improved.
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* Removed the double conversion at each classification.
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* Upgraded oldest structs to be classes and deprecated PBLOB.
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* Removed non-deterministic baseline fit.
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* Added fixed length dawgs for Chinese.
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* Handling of vertical text improved.
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* Handling of leader dots improved.
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* Table detection greatly improved.
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* Fixed a couple of memory leaks.
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* Fixed font labels on output text. (Not perfect, but a lot better than before.)
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* Cleanup and more bug fixes
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* Special treatments for Hindi.
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* Support for build in VS2010 with Microsoft Windows SDK for Windows 7 (thanks to Michael Lutz)
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2010-09-21 - V3.00
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* Preparations for thread safety:
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* Changed TessBaseAPI methods to be non-static
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* Created a class hierarchy for the directories to hold instance data,
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and began moving code into the classes.
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* Moved thresholding code to a separate class.
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* Added major new page layout analysis module.
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* Added HOCR output (issues 221, 263: thanks to amkryukov).
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* Added Leptonica as main image I/O and handling. Currently optional,
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but in future releases linking with Leptonica will be mandatory.
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* Ambiguity table rewritten to allow definite replacements in place
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of fix_quotes.
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* Added TessdataManager to combine data files into a single file.
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* Some dead code deleted.
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* VC++6 no longer supported. It can't cope with the use of templates.
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* Many more languages added.
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* Doxygenation of most of the function header comments.
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* Added man pages.
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* Added bash completion script (issue 247: thanks to neskiem)
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* Fix integer overview in thresholding (issue 366: thanks to Cyanide.Drake)
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* Add Danish Fraktur support (issues 300, 360: thanks to
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dsl602230@vip.cybercity.dk)
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* Fix file pointer leak (issue 359, thanks to yukihiro.nakadaira)
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* Fix an error using user-words (Issue 345: thanks to max.markin)
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* Fix a memory leak in tablefind.cpp (Issue 342, thanks to zdravco)
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* Fix a segfault due to double fclose (Issue 320, thanks to souther)
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* Fix an automake error (Issue 318, thanks to ichanjz)
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* Fix a Win32 crash on fileFormatIsTiff() (Issues 304, 316, 317, 330, 347,
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349, 352: thanks to nguyenq87, max.markin, zdenop)
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* Fixed a number of errors in newer (stricter) versions of VC++ (Issues
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301, among others)
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2009-06-30 - V2.04
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* Integrated bug fixes and patches and misc changes for portability.
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* Integrated a patch to remove some of the "access" macros.
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* Removed dependence on lua from the viewer, speeding it up
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dramatically.
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* Fixed the viewer so it compiles and runs properly!
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* Specifically fixing issues: 1, 63, 67, 71, 76, 81, 82, 106, 111,
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112, 128, 129, 130, 133, 135, 142, 143, 145, 147, 153, 154, 160,
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165, 170, 175, 177, 187, 192, 195, 199, 201, 205, 209, 108, 169
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2008-04-22 - V2.03
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* Fixed crash introduced in 2.02.
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* Fixed lack of tessembedded.cpp in distribution.
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* Added test for leptonica header files and conditional test for lib.
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2008-04-21 - V2.02 (again)
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* Fixed namespace collisions with jpeg library (INT32).
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* Portability fixes for Windows for new code.
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* Updates to autoconf system for new code.
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2008-01-23 - 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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2007-08-27 - 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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2007-07-02 - V2.00
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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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2007-05-15 - V1.04
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* Added dll exports for Windows.
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* Fixed name collisions with stl etc.
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* Made some preliminary changes ready for unicodeization.
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* Several bug fixes discovered during unicodeization.
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2007-02-02 - V1.03
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* Added mftraining and cntraining.
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* Added baseapi with adaptive thresholding for grey and color.
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* Fixed many memory leaks.
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* Fixed several bugs including lack of use of adaptive classifier.
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* Added ifdefs to eliminate graphics code and add embedded platform support.
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* Incorporated several patches, including 64-bit builds, Mac builds.
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* Minor accuracy improvements.
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2006-10-04 - V1.02
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* Removed dependency on Aspirin.
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* Fixed a few missing Apache license headers.
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* Removed $log.
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2006-09-07 - V1.01.
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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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2006-06-16 - V1.0 of open source Tesseract checked-in.
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