GRD. · No. 08 · COLLECTING · LIVE
stamp-grader
moderato, misurato
Honest stamp centering from a photo — a score you can see, not a black box.
- Stack
- Python · NumPy · OpenCV · Pyodide (on-device) · Cloudflare
- Role
- Creator
- Years
- 2026
- Status
- LIVE
- Dynamic
- mf (58 of 100)
A classical-CV grader that measures a stamp's centering (and perforation gauge, shape, cancellation flags) from a photo, and refuses to guess what a photo can't show. Anti-predatory: a measurement you can see, never a valuation. Shipped as a PyPI library and an on-device browser app.
Read the full write-up → “A stamp grader that shows its work and refuses to guess”