Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
Email Facebook Twitter Google+ LinkedIn Comments

Function Designed to Authenticate Name Seals

Photonics Spectra
Feb 2002
In China, a person must have a name seal to perform everyday functions such as withdrawing money from a bank, but visually authenticating the seals can take 5 to 10 minutes. To speed up the process, researchers from Yuan Ze University in Taiwan have constructed a computerized reference function that allows almost instant analysis of seals scanned with a laser and CCD detector.

The function uses a joint-transform-correlator method to mathematically compare, by means of Fourier analysis, input from a scanned image to a stored data matrix representing the authentic image. This approach is designed to allow processing of somewhat blurred or smudged seals without the need to position them for scanning.

Research & TechnologySensors & DetectorsTech Pulse

Terms & Conditions Privacy Policy About Us Contact Us
back to top

Facebook Twitter Instagram LinkedIn YouTube RSS
©2018 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA,
x Subscribe to Photonics Spectra magazine - FREE!