Dan Matthew
Service

Operator test

System
Nimbus CMS
Skin
Attract mode (arcade)
Entries
on this screen
Menus
8 items
Path
/projects/stamp-grader
Credits
Free play

Demo admin Skin: desk Skin: score

Press ~ to toggle · Esc to close

Cab 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”