CH 08 · COLLECTING · LIVE
stamp-grader
Honest stamp centering from a photo — a score you can see, not a black box.
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”