3 ms·
Philly cops used surveillance van marked 'Google Maps'
- sbierwagen 10y agoIt quoted a Kansas man with experience in public-safety technology as saying the van contained gear including "infrared cameras to find plate numbers and letters via temperature differentials between those characters and the surrounding background through optical character recognition." This guy is confusing near infrared (0.75 µm) with thermal infrared. (8–15 µm) Near infrared cameras are cheap. Thermal infrared cameras are expensive (exotic materials needed for the optics) and have poor resolution, which makes them a really poor choice for machine vision stuff. License plate cameras are near infrared.