What's Changed

This releases provides an improved PDF renderer, adds a new PAGE XML renderer, extends the API to retrieve the text angle/gradient and has lots of smaller updates for code and documentation:

• Update appveyor.yml - Url has changed by @softwaretirol in https://github.com/tesseract-ocr/tesseract/pull/4188
• Fix grey result of indexed PNG in pdfrenderer. by @sjbronner in https://github.com/tesseract-ocr/tesseract/pull/4189
• Fix some typos by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4191
• normstrngs: add more hyphens and quotes by @bertsky in https://github.com/tesseract-ocr/tesseract/pull/4195
• Rename frk -> deu_latf (ISO 639-3, ISO 15924) by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4202
• Fix some performance issues which were reported by Coverity Scan by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4204
• Remove broken Dockerfile by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4205
• PAGE XML renderer / export by @JKamlah in https://github.com/tesseract-ocr/tesseract/pull/4214
• Remove unsupported OpenCL code and related API functions by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4220
• facilitate vectorization for generic build by @heshpdx in https://github.com/tesseract-ocr/tesseract/pull/4223
• Support training without lstmf files by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4215
• Simplify GridSearch<...> variables using typedef equivalents by @sadra-barikbin in https://github.com/tesseract-ocr/tesseract/pull/4226
• Use std::min and std::max for min & max operations in makerow.cpp::most_overlapping_row() by @sadra-barikbin in https://github.com/tesseract-ocr/tesseract/pull/4229
• Fix a few typos in comments by @sadra-barikbin in https://github.com/tesseract-ocr/tesseract/pull/4227
• Remove an unused variable in paragraphs.cpp::DetectParagraphs() by @sadra-barikbin in https://github.com/tesseract-ocr/tesseract/pull/4228
• A few refactors in some files by @sadra-barikbin in https://github.com/tesseract-ocr/tesseract/pull/4225
• Fix <Unicode> output and issues reported by Coverity Scan for PAGE XML renderer by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4234
• Update documentation by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4235
• Fix some issues which were reported by GitHub code scanning by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4236
• Improve CCUtil::main_setup (fixes issue #4230) by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4239
• Allow for text angle/gradient to be retrieved by @Balearica in https://github.com/tesseract-ocr/tesseract/pull/4070
• Fix setup of datadir on installations with Conda (issue #4230) by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4240
• Fix FP exception in Wordrec::angle_change (issue #4242) by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4243
• Use AM_CPPFLAGS also for compilation of all sources by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4244
• Fix some compiler warnings by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4245
• Remove unused xmlns:xlink from ALTO renderer by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4241
• Fix some compiler warnings by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4246
• Fixes #4247: remove unnecessary nullptr checks by @hribz in https://github.com/tesseract-ocr/tesseract/pull/4248
• Avoid redundant conversion from std::string to char * to std::string by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4249
• Replace strcpy and strncpy by new inline helper function by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4250
• Make function Network::spec pure virtual by @stweil in https://github.com/tesseract-ocr/tesseract/pull/4253

New Contributors

• @softwaretirol made their first contribution in https://github.com/tesseract-ocr/tesseract/pull/4188
• @sjbronner made their first contribution in https://github.com/tesseract-ocr/tesseract/pull/4189
• @JKamlah made their first contribution in https://github.com/tesseract-ocr/tesseract/pull/4214
• @heshpdx made their first contribution in https://github.com/tesseract-ocr/tesseract/pull/4223
• @Balearica made their first contribution in https://github.com/tesseract-ocr/tesseract/pull/4070
• @hribz made their first contribution in https://github.com/tesseract-ocr/tesseract/pull/4248

Full Changelog: https://github.com/tesseract-ocr/tesseract/compare/5.3.4...5.4.0