forked from tesseract-ocr/tesseract
-
Notifications
You must be signed in to change notification settings - Fork 0
/
ChangeLog
282 lines (263 loc) · 14.7 KB
/
ChangeLog
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
2019-07-07 - V4.1.0
* Added new renders Alto, LSTMBox, WordStrBox.
* Added character boxes in hOCR output.
* Added python training scripts (experimental) as alternative shell scripts.
* Better support AVX / AVX2 / SSE.
* Disable OpenMP support by default (see e.g. #1171, #1081).
* Fix for bounding box problem.
* Implemented support for whitelist/blacklist in LSTM engine.
* Improved cmake configuration.
* Code modernization and improvements.
* A lot of bug fixes...
2018-10-29 - V4.0.0
* Added new neural network system based on LSTMs, with major accuracy gains.
* Improvements to PDF rendering.
* Fixes to trainingdata rendering.
* Added LSTM models+lang models to 101 languages. (tessdata repository)
* Improved multi-page TIFF handling.
* Fixed damage to binary images when processing PDFs.
* Fixes to training process to allow incremental training from a recognition model.
* Made LSTM the default engine, pushed cube out.
* Deleted cube code.
* Changed OEModes --oem 0 for legacy tesseract engine, --oem 1 for LSTM, --oem 2 for both, --oem 3 for default.
* Avoid use of Leptonica debug parameters or functions.
* Fixed multi-language mode.
* Removed support for VS2010.
* Added Support for VS2015 and VS2017 with CPPAN.
* Implemented invisible text only for PDF.
* Added AVX / SSE support for Windows.
* Enabled OpenMP support.
* Parameter unlv_tilde_crunching change to false.
* Miscellaneous Fixes.
* Detailed Changelog can be found at https://github.com/tesseract-ocr/tesseract/wiki/4.0x-Changelog and https://github.com/tesseract-ocr/tesseract/wiki/ReleaseNotes#tesseract-release-notes-oct-29-2018---v400
2017-02-16 - V3.05.00
* Made some fine tuning to the hOCR output.
* Added TSV as another optional output format.
* Fixed ABI break introduced in 3.04.00 with the AnalyseLayout() method.
* text2image tool - Enable all OpenType ligatures available in a font. This feature requires Pango 1.38 or newer.
* Training tools - Replaced asserts with tprintf() and exit(1).
* Fixed Cygwin compatibility.
* Improved multipage tiff processing.
* Improved the embedded pdf font (pdf.ttf).
* Enable selection of OCR engine mode from command line.
* Changed tesseract command line parameter '-psm' to '--psm'.
* Write output of tesseract --help, --version and --list-langs to stdout instead of stderr.
* Added new C API for orientation and script detection, removed the old one.
* Increased minimum autoconf version to 2.59.
* Removed dead code.
* Require Leptonica 1.74 or higher.
* Fixed many compiler warning.
* Fixed memory and resource leaks.
* Fixed some issues with the 'Cube' OCR engine.
* Fixed some openCL issues.
* Added option to build Tesseract with CMake build system.
* Implemented CPPAN support for easy Windows building.
2016-02-17 - V3.04.01
* Added OSD renderer for psm 0. Works for single page and multi-page images.
* Improve tesstrain.sh script.
* Simplify build and run of ScrollView.
* Improved PDF output for OS X Preview utility.
* INCOMPATIBLE fix to hOCR line height information - commit 134ebc3.
* Added option to build Tesseract without Cube OCR engine (-DNO_CUBE_BUILD).
* Enable OpenMP support.
* Many bug fixes.
2015-07-11 - V3.04.00
* 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).
* Tesseract now requires leptonica 1.71 or a higher version.
* Removed official support for VS 2008.
* 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
* Major updates to training system as a result of extensive testing on 100 languages.
* New training data for over 100 languages
* Improved performance with PIC compilation option.
* Significant change to invisible font system in pdf output to improve correctness and compatibility with external programs, particularly ghostscript.
* Improved font identification.
* Major change to improve layout analysis for heavily diacritic languages: Thai, Vietnamese, Kannada, Telugu etc.
* Fixed problems with shifted baselines so recognition can recover from layout analysis errors.
* Major refactor to improve speed on difficult images, especially when running a heap checker.
* Moved params from global in page layout to tesseractclass.
* Improved single column layout analysis.
* Allow ocr output to multiple formats using tesseract command line executable.
* Fixed issues with mixed eng+ara scripts.
* Improved script consistency in numbers.
* Major refactor of control.cpp to enable line recognition.
* Added tesstrain.sh - a master training script.
* Added ability to text2image training tool to just list available fonts.
* Added ability to text2image to underline words.
* Improved efficiency of image processing for PDF output.
* Added parameter description for each parameter listed with 'print-parameters' command line option.
* Added font info to hOCR output.
* Enabled streaming input and output of multi-page documents.
* Many bug fixes.
2014-02-04 - V3.03(rc1)
* Added new training tool text2image to generate box/tif file pairs from
text and truetype fonts.
* Added support for PDF output with searchable text.
* Removed entire IMAGE class and all code in image directory.
* Tesseract executable: support for output to stdout; limited support for one
page images from stdin (especially on Windows)
* Added Renderer to API to allow document-level processing and output
of document formats, like hOCR, PDF.
* Major refactor of word-level recognition, beam search, eliminating dead code.
* Refactored classifier to make it easier to add new ones.
* Generalized feature extractor to allow feature extraction from greyscale.
* Improved sub/superscript treatment.
* Improved baseline fit.
* Added set_unicharset_properties to training tools.
* Many bug fixes.
* More training source data included.
2012-02-01 - V3.02
* Moved ResultIterator/PageIterator to ccmain.
* Added Right-to-left/Bidi capability in the output iterators for Hebrew/Arabic.
* Added paragraph detection in layout analysis/post OCR.
* Fixed inconsistent xheight during training and over-chopping.
* Added simultaneous multi-language capability.
* Refactored top-level word recognition module.
* Added experimental equation detector.
* Improved handling of resolution from input images.
* Blamer module added for error analysis.
* Cleaned up externally used namespace by removing includes from baseapi.h.
* Removed dead memory mangagement code.
* Tidied up constraints on control parameters.
* Added support for ShapeTable in classifier and training.
* Refactored class pruner.
* Fixed training leaks and randomness.
* Major improvements to layout analysis for better image detection, diacritic detection, better textline finding, better tabstop finding.
* Improved line detection and removal.
* Added fixed pitch chopper for CJK.
* Added UNICHARSET to WERD_CHOICE to make mult-language handling easier.
* Fixed problems with internally scaled images.
* Added page and bbox to string in tr files to identify source of training data better.
* Fixes to Hindi Shiroreka splitter.
* Added word bigram correction.
* Reduced stack memory consumption and eliminated some ugly typedefs.
* Added new uniform classifier API.
* Added new training error counter.
* Fixed endian bug in dawg reader.
* Many other fixes, including the way in which the chopper finds chops and messes with the outline while it does so.
2010-11-29 - V3.01
* Removed old/dead serialise/deserialze methods on *LISTIZED classes.
* Total rewrite of DENORM to better encapsulate operation and make
for potential to extract features from images.
* 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.
* 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.*
* `OcrEngineMode` in `Init` replaces `AccuracyVSpeed` to control cube.
* Greatly improved segmentation search with consequent accuracy and speed improvements, especially for Chinese.
* 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.
* 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.
* Auto orientation and script detection added to page layout analysis.
* Deleted *lots* of dead code.
* Fixxht module replaced with scalable data-driven module.
* Output font characteristics accuracy improved.
* Removed the double conversion at each classification.
* Upgraded oldest structs to be classes and deprecated PBLOB.
* Removed non-deterministic baseline fit.
* Added fixed length dawgs for Chinese.
* Handling of vertical text improved.
* Handling of leader dots improved.
* Table detection greatly improved.
* Fixed a couple of memory leaks.
* Fixed font labels on output text. (Not perfect, but a lot better than before.)
* Cleanup and more bug fixes
* Special treatments for Hindi.
* Support for build in VS2010 with Microsoft Windows SDK for Windows 7 (thanks to Michael Lutz)
2010-09-21 - V3.00
* Preparations for thread safety:
* Changed TessBaseAPI methods to be non-static
* Created a class hierarchy for the directories to hold instance data,
and began moving code into the classes.
* Moved thresholding code to a separate class.
* Added major new page layout analysis module.
* Added HOCR output (issues 221, 263: thanks to amkryukov).
* Added Leptonica as main image I/O and handling. Currently optional,
but in future releases linking with Leptonica will be mandatory.
* Ambiguity table rewritten to allow definite replacements in place
of fix_quotes.
* Added TessdataManager to combine data files into a single file.
* Some dead code deleted.
* VC++6 no longer supported. It can't cope with the use of templates.
* Many more languages added.
* Doxygenation of most of the function header comments.
* Added man pages.
* Added bash completion script (issue 247: thanks to neskiem)
* Fix integer overview in thresholding (issue 366: thanks to Cyanide.Drake)
* Add Danish Fraktur support (issues 300, 360: thanks to
dsl602230@vip.cybercity.dk)
* Fix file pointer leak (issue 359, thanks to yukihiro.nakadaira)
* Fix an error using user-words (Issue 345: thanks to max.markin)
* Fix a memory leak in tablefind.cpp (Issue 342, thanks to zdravco)
* Fix a segfault due to double fclose (Issue 320, thanks to souther)
* Fix an automake error (Issue 318, thanks to ichanjz)
* Fix a Win32 crash on fileFormatIsTiff() (Issues 304, 316, 317, 330, 347,
349, 352: thanks to nguyenq87, max.markin, zdenop)
* Fixed a number of errors in newer (stricter) versions of VC++ (Issues
301, among others)
2009-06-30 - V2.04
* Integrated bug fixes and patches and misc changes for portability.
* Integrated a patch to remove some of the "access" macros.
* Removed dependence on lua from the viewer, speeding it up
dramatically.
* Fixed the viewer so it compiles and runs properly!
* Specifically fixing issues: 1, 63, 67, 71, 76, 81, 82, 106, 111,
112, 128, 129, 130, 133, 135, 142, 143, 145, 147, 153, 154, 160,
165, 170, 175, 177, 187, 192, 195, 199, 201, 205, 209, 108, 169
2008-04-22 - V2.03
* Fixed crash introduced in 2.02.
* Fixed lack of tessembedded.cpp in distribution.
* Added test for leptonica header files and conditional test for lib.
2008-04-21 - V2.02 (again)
* Fixed namespace collisions with jpeg library (INT32).
* Portability fixes for Windows for new code.
* Updates to autoconf system for new code.
2008-01-23 - V2.02
* Improvements to clustering, training and classifier.
* Major internationalization improvements for large-character-set
* languages, eg Kannada.
* Removed some compiler warnings.
* Added multipage tiff support for training and running.
* Updated graphics output to talk to new java-based viewer.
* Added ability to save n-best lists.
* Added leptonica support for more file types.
* Improved Init/End to make them safe.
* Reduced memory use of dictionaries.
* Added some new APIs to TessBaseAPI.
2007-08-27 - V2.01
* Fixed UTF8 input problems with box file reader.
* Fixed various infinite loops and crashes in dawg code.
* Removed include of config_auto.h from host.h.
* Added automatic wctype encoding to unicharset_extractor.
* Fixed dawg table too full error.
* Removed svn files from tarball.
* Added new functions to tessdll.
* Increased maximum utf8 string in a classification result to 8.
2007-07-02 - V2.00
* Converted internal character handling to UTF8.
* Trained with 6 languages.
* Added unicharset_extractor, wordlist2dawg.
* Added boxfile creation mode.
* Added UNLV regression test capability.
* Fixed problems with copyright and registered symbols.
* Fixed extern "C" declarations problem.
2007-05-15 - V1.04
* Added dll exports for Windows.
* Fixed name collisions with stl etc.
* Made some preliminary changes ready for unicodeization.
* Several bug fixes discovered during unicodeization.
2007-02-02 - V1.03
* Added mftraining and cntraining.
* Added baseapi with adaptive thresholding for grey and color.
* Fixed many memory leaks.
* Fixed several bugs including lack of use of adaptive classifier.
* Added ifdefs to eliminate graphics code and add embedded platform support.
* Incorporated several patches, including 64-bit builds, Mac builds.
* Minor accuracy improvements.
2006-10-04 - V1.02
* Removed dependency on Aspirin.
* Fixed a few missing Apache license headers.
* Removed $log.
2006-09-07 - V1.01.
* Added mfcpch.cpp and getopt.cpp for VC++.
* Fixed problem with greyscale images and no libtiff.
* Stopped debug window from being used for the usage output.
* Fixed load of inttemp for big-endian architectures.
* Fixed some Mac compilation issues.
2006-06-16 - V1.0 of open source Tesseract checked-in.