# ocr/app/

## Files

| File | What | When to read |
| ---- | ---- | ------------ |
| `main.py` | FastAPI application entry point | Route registration, app setup |
| `config.py` | Configuration settings | Environment variables, settings |
| `__init__.py` | Package init | Package structure |

## Subdirectories

| Directory | What | When to read |
| --------- | ---- | ------------ |
| `engines/` | OCR engine abstraction (PaddleOCR primary, Google Vision fallback) | Engine changes, adding new engines |
| `extractors/` | Data extraction logic | Adding new extraction types |
| `models/` | Data models and schemas | Request/response types |
| `patterns/` | Regex and parsing patterns | Pattern matching rules |
| `preprocessors/` | Image preprocessing pipeline | Image preparation before OCR |
| `routers/` | FastAPI route handlers | API endpoint changes |
| `services/` | Business logic services | Core OCR processing |
| `table_extraction/` | Table detection and parsing | Structured data extraction |
| `validators/` | Input validation | Validation rules |