{
  "benchmark": "TextMuncher Ebook OCR Accuracy Benchmark",
  "run": "blinded holdout, 2026-08-01",
  "publishedAt": "2026-08-31",
  "page": "https://textmuncher.com/blog/ocr-accuracy-benchmark",
  "groundTruth": "human-adjudicated answer key, built from three independent reference transcripts scored against the page images",
  "scorer": "Levenshtein distance over normalised text with running heads and folios stripped symmetrically from every arm",
  "cloudEngineUnderTest": "Google Document AI (version-pinned processor)",
  "onDeviceEngine": "Tesseract.js 7 (the engine the free tier runs)",
  "arms": {
    "onDevice": "production pipeline, on-device OCR only, no cloud pass",
    "selected": "the hybrid design that shipped: on-device OCR plus a cloud re-read of pages its damage detector flagged",
    "alternate": "a second, independently built hybrid design that used the same cloud engine but a different page-damage detector"
  },
  "fields": {
    "page": "page identifier; titles are anonymised as title-a and title-b",
    "scoredCharacters": "characters in the adjudicated answer key for that page, after normalisation",
    "flaggedBySelectedDetector": "whether the shipped detector marked this page as damaged",
    "flaggedByAlternateDetector": "whether the competing detector marked this page as damaged",
    "onDeviceErrorCharacters": "edit distance from the answer key, on-device arm",
    "selectedErrorCharacters": "edit distance from the answer key, shipped hybrid arm",
    "alternateErrorCharacters": "edit distance from the answer key, competing hybrid arm",
    "onDeviceCer|selectedCer|alternateCer": "the matching character error rate for that page"
  },
  "totals": {
    "pages": 96,
    "scoredCharacters": 223666,
    "onDeviceErrorCharacters": 8135,
    "selectedErrorCharacters": 6532,
    "alternateErrorCharacters": 7750
  },
  "perTitle": {
    "title-a": {
      "scoredPages": 30,
      "scoredCharacters": 92996,
      "onDeviceErrorCharacters": 7018,
      "selectedErrorCharacters": 5607,
      "alternateErrorCharacters": 6650
    },
    "title-b": {
      "scoredPages": 66,
      "scoredCharacters": 130670,
      "onDeviceErrorCharacters": 1117,
      "selectedErrorCharacters": 925,
      "alternateErrorCharacters": 1100
    }
  },
  "notes": [
    "Values are copied verbatim from the scoring run; only the arm and title labels were renamed for publication.",
    "The scoring set is deliberately hard: it is the union of both detectors' flagged pages plus ten random control pages, so its error rates are far above a book-average rate.",
    "The corpus itself is commercially published text and is not redistributable, so page images and transcripts are not included."
  ],
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