Vishay OPTO Squad

To Be Anonymous, Wear A Big Hat

The use of security cameras has increased.   Most of these cameras are on a 24-hour or 72-hour recording loop, recording and recording over, ad infinitum.  Only when something of interest happens, like a burglary, do these recordings get viewed by someone.  A few cameras may have human operators; even fewer use facial recognition software.  Recent generations of security cameras provide high definition images which will go a long way to help identify and capture criminals.  High intensity infrared emitters like Vishay’s SurfLight™ complement the high definition trend.

Unlike your video camera or smart phone, security cameras do not have blue, green or red filters to provide color nor do they filter out the near infrared.  This is why security cameras only record black and white images.  Because they need to work at night, they use infrared emitters to illuminate the field of view and the reflected light becomes the image that gets recorded.  The image below is of a typical security camera loaded with 5 mm or T1¾ infrared emitters.  Emitters used have wavelengths of 850 nm to 940 nm.

Security Camera.jpg

The efforts of Isao Echizen, Ph.D., Associate Professor at the National Institute of Informatics (NII) in Japan captured the spotlight last week.  He has spent time designing infrared ‘glasses’ to mask or blur his features so that facial recognition software used in conjuction with security cameras is hampered.


The photo above is taken with a camera that is sensitive to infrared light.  The purple lights are actually invisible to the human eye. They would be recorded by security cameras and would obscure the person’s features.  In all likelihood, the persons face would appear as a bright or overexposed spot on the recording.

Is too much energy being spent on trying to fool the law instead of just following the law?  Or is this necessity being the mother of invention?

One comment on “To Be Anonymous, Wear A Big Hat

  1. John
    February 11, 2016

    Security cameras can provide vital clues to the police to identify and trace the people involved in unlawful activities let it be a criminal tress passing, burglary or mob attack or arson. To track all the movements inside and outside of a premise, you need to use the suitable security camera system.

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.


This entry was posted on June 26, 2015 by in Articles, Infrared Emitter.
%d bloggers like this: