facial recognition @ 200ft
- Thread starter farnk
- Start date
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Required resolution | Axis Communications
At night, I doubt you will be able to adequately illuminate the face
Required resolution | Axis Communications
At night, I doubt you will be able to adequately illuminate the face
I don't mind adding an external IR illuminator if it helps
awsum140
Known around here
Sure you can....Hollywood does it all the time in movies.
The two main challenges to doing this are long focal length and IR range. You are going to need a relatively long focal length. The exact length will depend on imager size and resolution but to get somewhere in 50 to 100ppf at 200' distance, you will need a focal length of 20 - 50mm. At the same time, you (probably) will need a camera that delivers IR at 60+ meters (i.e., 200' ~ 60 meters). Important to keep in mind that most cameras overspecify their IR range so even if you get a camera specified for 60m IR range, the IR illumination at 60 meters will be fairly dim.
Net/net, it's possible but you may need to experiment with a few cameras. If you can afford it a PTZ would work well here as they tend to be designed for local focal lengths plus longer IR ranges than a typical bullet fixed camera.
Net/net, it's possible but you may need to experiment with a few cameras. If you can afford it a PTZ would work well here as they tend to be designed for local focal lengths plus longer IR ranges than a typical bullet fixed camera.
50mm lens on 1/3" sensor give you about 20ft width at 200ft.
in daytime, 100ppf for a 2M/1080p cam would probably work, but
night would probably warrant a bigger lens...
Maybe a box cam that takes a C/CS lens, so you can go to 100mm?
as for IR, something like this (at narrowest setting) could probably get some IR in that range:
US $56.26 40% OFF|Video Surveillance 5 80 Degree Adjustable focus 12V Night Vision 850nm IR Infrared Illuminator Light lamp For CCTV Cameras-in CCTV Accessories from Security & Protection on Aliexpress.com | Alibaba Group
may need more than one...
in daytime, 100ppf for a 2M/1080p cam would probably work, but
night would probably warrant a bigger lens...
Maybe a box cam that takes a C/CS lens, so you can go to 100mm?
as for IR, something like this (at narrowest setting) could probably get some IR in that range:
US $56.26 40% OFF|Video Surveillance 5 80 Degree Adjustable focus 12V Night Vision 850nm IR Infrared Illuminator Light lamp For CCTV Cameras-in CCTV Accessories from Security & Protection on Aliexpress.com | Alibaba Group
may need more than one...