Why ANVIZ fingerprint sensor use blue area source?

04/19/2012

Fingerprint sensor with blue area source. ANVIZ fingerprint sensor utilizes blue area source (a stable light in spectrum) as background light. The generated image fully matches the real one. Accurate and good in anti-interference. No latent fingerprint impact. The image generated by point source is opposite to the real one and easy to mistake the latent fingerprint for a real one which leaves an emerging security risk. The main feature is no latent fingerprint impact.