K10124/japan-ocr-mini-benchmark

Japan OCR Mini Benchmark

Dataset Summary

Japan OCR Mini Benchmark is a compact benchmark for evaluating whether OCR/VLM models can read Japanese receipts and return structured JSON. It covers receipt-level fields, item rows, tax summaries, totals, payment methods, and clean/noisy image variants.

The current repository entry point includes the frozen v0.2.0 dataset payload, the v0.4.0 Clean/Noisy LM Studio leaderboard, the v0.4.2 receipt-generation design-candidate library, and the new alpha10 public alpha payload.

Latest Status

• Latest public alpha payload: alpha10
  • 10 approved synthetic Japanese receipt samples
  • clean images + public source JSON + public metadata
  • invoice_profile / phone_profile included
  • public safety scan: pass
  • license: CC BY 4.0
  • CASE-000048 excluded
• Frozen core dataset payload: v0.2.0
• Current model benchmark: v0.4.0 Clean/Noisy LM Studio leaderboard
• Current receipt-generation library: v0.4.2
• Accepted receipt design candidates: 83
• Distinct semantic structures: audit in progress

Alpha10 Approved Payload

Alpha10 is the first small public-approved payload from the receipt library workflow. It contains:

• 10 clean synthetic Japanese receipt images
• 10 public source JSON files
• 10 public metadata JSON files
• invoice_profile and phone_profile fields
• public safety scan pass
• CC BY 4.0 license confirmation for the Alpha10 approved payload
• human approval record in the local release workflow
• CASE-000048 excluded

The CC BY 4.0 confirmation applies to the Alpha10 approved payload. Other project materials and future releases should be checked separately before reuse.

Dataset Structure

alpha10/
  README.md
  LICENSE_NOTICE.md
  ALPHA10_LICENSE_FINAL_CONFIRMATION.md
  alpha10_manifest.json
  alpha10_manifest.csv
  alpha10_public_safety_scan.md
  images/
  source_json/
  metadata/

Data Fields

Alpha10 source JSON records include receipt identity, item rows, totals, tax summary, payment fields, and public safety metadata. Alpha10 metadata records include image path, source JSON path, SHA-256 hash, generation identifiers, invoice_profile, phone_profile, and public safety status.

Intended Uses

• OCR/VLM evaluation on Japanese receipt images
• JSON extraction testing
• receipt-specific field, item, tax, and payment evaluation
• small local benchmark checks before larger experiments

Out-of-Scope Uses

• large-scale model training as a primary dataset
• identity, store, phone, or registration-number verification
• financial, tax, legal, or accounting advice
• claims about real merchants or real transactions

Synthetic Data Notice

The public data is synthetic. It does not include real receipt photos, real customer data, real transactions, copied real logos, or real brand assets.

Public Safety and Privacy

• phone numbers and invoice registration numbers are synthetic or unverified OCR benchmark fields
• no live lookup was performed for phone numbers or registration numbers
• invoice_profile and phone_profile are included for structured evaluation
• real reference images are not included
• CASE-000048 is excluded

Limitations

Alpha10 is a small alpha payload with 10 samples across cinema, coin_laundry, discount_store, onsen, restaurant, shared_workspace, supermarket_food, sweets_shop, taxi_transport, washoku. It is useful for inspection and early evaluation, but it is not a final taxonomy of Japanese receipt structures. The v0.4.2 library contains 83 accepted design candidates, but the audited distinct semantic-structure count is still in progress.

Benchmark Releases

Area	Version	What it contains
Public alpha payload	alpha10	10 human-approved synthetic Japanese receipt samples with clean images, public source JSON, metadata, invoice/phone profiles, and public safety scan pass
Dataset payload	v0.2.0	20 synthetic Japanese receipts with clean/noisy images and ground-truth JSON
LM Studio baseline	v0.3.0	first local multi-model noisy-image benchmark
Operational snapshots	v0.3.1, v0.3.2	additional LM Studio runs and combined rankings
Clean/Noisy leaderboard	v0.4.0	paired clean and noisy benchmark tables
Generator QA	v0.4.1	audited 23-template clean receipt generator snapshot
Design-candidate library	v0.4.2	83 accepted receipt designs for future taxonomy and 100-type generation

Repository Map

alpha10/
  README.md
  LICENSE_NOTICE.md
  ALPHA10_LICENSE_FINAL_CONFIRMATION.md
  alpha10_manifest.json
  alpha10_manifest.csv
  alpha10_public_safety_scan.md
  images/
  source_json/
  metadata/

v0.4.2 reference-generation report folder/
  README.md
  index.html
  contact_sheet.png
  manifest.jsonl
  summary.json

reports/v0.4.0/
  clean_leaderboard.*
  noisy_leaderboard.*
  clean_noisy_paired_leaderboard.*

License

The Alpha10 approved payload is released under CC BY 4.0. This license confirmation applies to the Alpha10 approved payload. See alpha10/ALPHA10_LICENSE_FINAL_CONFIRMATION.md and alpha10/LICENSE_NOTICE.md after the payload is mirrored.