polis-recognizer 0.1.0

Russian KASKO insurance policy field extractor — pulls 7 structured fields from PDF policies (text-layer + tables + OCR fallback).

polis-recognizer

A deterministic field extractor for Russian KASKO insurance policy PDFs. Pulls 7 structured fields without LLMs — text-layer extraction (pypdf) plus optional table-aware reading (pdfplumber), with Tesseract OCR fallback for scanned policies.

Status: pre-stable (0.x). API may change before 1.0.

What it extracts

Field	Type	Example
policy_number	str	"AC524160804"
policy_period	{start, end} (date)	{"start": date(2025, 2, 27), "end": date(2026, 2, 26)}
franchise	{value, currency, absent}	{"value": 30000, "currency": "RUB", "absent": False}
limit	{value, currency}	{"value": 5525000, "currency": "RUB"}
premium	{value, currency}	{"value": 220000, "currency": "RUB"}
sum_type	"aggregate" / "non_aggregate"	"non_aggregate"
repair_mode	"dealer" / "service" / "cash"	"dealer"

Quick start

from polis_recognizer import PolicyExtractor

extractor = PolicyExtractor()
result = extractor.extract_from_pdf("/path/to/polis.pdf")

print(result.policy_number)
# → "AC524160804"
print(result.policy_period)
# → {"start": date(2025, 2, 27), "end": date(2026, 2, 26)}
print(result.franchise)
# → {"value": 30000.0, "currency": "RUB", "absent": False}

Input methods:

extractor.extract_from_pdf("polis.pdf")
extractor.extract_from_bytes(pdf_bytes, filename="polis.pdf")
extractor.extract_from_text("сырой текст полиса")  # bypass PDF/OCR

Installation

pip install polis-recognizer

System dependencies

polis-recognizer shells out to Tesseract for OCR and to poppler for PDF→image conversion. These are NOT pip-installable; install them through your OS package manager.

Linux (Debian/Ubuntu):

sudo apt-get install -y tesseract-ocr tesseract-ocr-rus poppler-utils libgl1

macOS (Homebrew):

brew install tesseract tesseract-lang poppler

Windows: best-effort. Install Tesseract for Windows and add it to PATH; install Poppler binaries for PDF support. We don't test on Windows in CI.

The Russian language pack (tesseract-ocr-rus / tesseract-lang) is required — without it, OCR silently falls back to English and Cyrillic documents come back as garbage. The library logs a CRITICAL warning at import time if the pack is missing.

How it works

The extractor runs three stages:

1. PDF ingestion — PdfExtractionRouter tries text-layer extraction first (pypdf for text, pdfplumber for tables on the same page). If the result is too short (fewer than 100 chars by default) or detected as glued/EDI-envelope text, it falls back to Tesseract OCR.
2. Text normalization — Unicode NFKC, NBSP stripping, hyphenated line-break healing, runs of multiple spaces collapsed.
3. Field extraction — 7 deterministic parsers (one per field) run regex + table-aware patterns and emit Candidates with confidence scores. A ranker picks the winner per field.

There's no LLM and no cloud dependency. Everything runs locally.

PDF extractor choice

The default is "hybrid" — pypdf text plus pdfplumber tables in one pass. Two alternatives:

Option	When to use
"hybrid" (default)	Best for KASKO. pypdf preserves date/period text quality, pdfplumber's tables fix the column layout for limit/franchise/premium.
"pypdf"	Faster, no tables. Use when document quality is uniform and tables aren't needed.
"pdfplumber"	Fully layout-aware. Slower; on KASKO it slightly regresses date parsing. Use for table-heavy non-KASKO formats.

extractor = PolicyExtractor(pdf_extractor="pypdf")

Supported insurer formats

The parser ships with patterns for these Russian insurers' KASKO templates: АльфаСтрахование (XLS form-mask), СОГАЗ-АВТО, Чулпан, Ингосстрах, ВСК, АбсолютСтрахование, Росгосстрах, СОГАЗ Diadoc-wrapped PDFs. Recall on real-world KASKO corpora is ~50-65% per field; pulling above that requires per-format parser additions.

If you have a policy from an insurer not on this list — see CONTRIBUTING.md for how to add a parser pattern.

Configuration

Constructor arguments:

extractor = PolicyExtractor(
    ocr_language="rus+eng",       # Tesseract language string
    ocr_timeout_seconds=300,
    ocr_page_limit=50,
    ocr_max_text_size=500_000,
    pdf_extractor="hybrid",       # "pypdf" | "pdfplumber" | "hybrid"
    image_preprocessing="fallback", # "never" | "fallback" | "always"
    psm=None,                     # Tesseract --psm (None = auto)
    oem=None,                     # Tesseract --oem (None = auto)
    max_image_size_bytes=None,    # reject images larger than this
)

License

MIT © Grigorii Grachev. Free for any use, including commercial.

Roadmap

This 0.1.0 release focuses on KASKO. ОСАГО support is on the roadmap — the underlying field model already accommodates it; only parser patterns need to be added.

See CHANGELOG.md for release history.