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tesseract-ocr / tesseract

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How tesseract-ocr/tesseract is laid out, and where to start for common changes.

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AI

Add a new output format renderer

  • Create a new class inheriting from TessBaseRenderer in src/api/renderer.cpp
  • Register the new renderer factory in baseapi.cpp's GetRenderers() or similar dispatch method

Add a new character classification feature

  • Define feature extraction in src/classify/classify.cpp or create a new module
  • Hook feature computation into the LSTM input pipeline in src/lstm/input.cpp
  • Retrain language model using src/training/cntraining.cpp with new feature data

Optimize matrix operations for a new CPU target

  • Create new dotproduct variant (e.g., src/arch/dotproductavx512.cpp for AVX-512)
  • Implement IntSimdMatrix specialization in src/arch/intsimdmatrix.cpp with dispatch logic
  • Update CMakeLists.txt in src/training to compile new SIMD variant and select at runtime

Add or update tests

Change build or automation

RepoPilot lists up to 500 files, so a file missing here may still exist.

  • No public API or start-up file could be picked out from the file names.

Code quality and hotspots

Largest source files

  • Branch points357 per file on average
  • Code issues0 errors, 84 warnings
  • Largest file8,201 lines
  • Hotspot load1 high-risk file

Static checks on the 15 largest source files.

Tests, CI and tooling

  • CIAppVeyor · GitHub Actions15 workflows
  • TestsNot detected0.00 test files per source file (file count, not coverage)
  • Dependency updatesCodeQL

Hotspots

Files that change often and branch heavily, highest first. Branch points count if, loop, case, catch, ternary, && and || in the file.