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docs: record the consistent-misread failure mode

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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kiyo9w 2026-09-24 14:12:10 +09:00
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recognization/docs/API.md
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@ -333,9 +333,14 @@ is matched against the catalog separately.
- **Tag detection is the weak link, not the OCR.** On a shelf with ~100 facings the
pass currently finds tags for a minority of them at this distance; the compliance
hints say so instead of inventing violations.
- **A single read can misread a digit.** The vote needs independent reads (live mode
accumulates them across frames; stills read each band twice at different upscales),
and a dead heat stays unread rather than guessing.
- **A single read can misread a digit, and a consistent misread survives the vote.**
The vote needs independent reads (live mode accumulates them across frames; stills
read each band twice at different upscales) and a dead heat stays unread rather than
guessing, but when one wrong reading wins most frames it settles as wrong - measured
once in a 40-frame live run (`3609` for a `360` tag, 10 observations against 8). The
safeguard is downstream: a wrong tag price shows as a `mismatch` with both values and
is never applied to the product identity. Cross-checking the sale price against the
regular price and discount is the recorded next improvement.
- **The demo catalog is fictional**, so tag prices legitimately disagree with it. That
is shown as `mismatch` with both values; it is not an error.