Question 1

What is PerfGauge?

Accepted Answer

PerfGauge is a web and mobile app for stamp collectors and dealers that automatically measures perforation gauges on all 4 sides of a stamp, detects print types (flat plate vs. rotary press), identifies grill mark patterns, and matches stamps against catalogs — all from a single photograph.

Question 2

How does PerfGauge measure perforation gauges?

Accepted Answer

PerfGauge uses computer vision to detect individual perforation holes along each edge of a stamp, then calculates the gauge (holes per 2cm) with sub-pixel accuracy on all four sides independently.

Question 3

Can PerfGauge detect grill marks on stamps?

Accepted Answer

Yes. PerfGauge can identify and classify grill patterns from type A through J, including their dimensions and orientation, from a high-resolution photo.

Question 4

Does PerfGauge work on mobile phones?

Accepted Answer

Yes. PerfGauge is a progressive web app optimized for mobile. It uses your phone camera with auto-level detection to capture stamps hands-free.