A certain camera position and view angle are required for high-quality face recognition.
Minimum requirements for parameters for facial recognition cameras.
|Number of streams||Support for dual stream with independent configuration.|
|Stream resolution||With a recognition distance of 4m – not less than 1920x1080px;|
With a recognition distance of up to 4m, at least 1280x720px.
|Stream properties||The aspect ratio of the video should match the aspect ratio of the actual scene to prevent geometric distortion.Stream typeAspect ratioHD 1280×720 Constant Bitrate: 2.5 MBit/sec, 25 frames/sec16:9FullHD 1920×1080 Constant Bitrate: 4.0 MBit/sec, 25 frames/sec16:9If the image is distorted, the camera should transmit the correct SAR (DAR) parameter in the stream.|
|Keyframe (i-frame) interval||at least 1 keyframe per second|
|Focal length of the lens||from 4mm.|
|Lens type||Fixed (motorized varifocal is recommended).|
|Matrix||1/1.8’’ Progressive Scan CMOS.|
|S/N ratio||> 50 dB.|
|Photosensitivity||0.002lc (F1.2) – 0.0002lc (F1.4).|
|Image enhancement||Hardware WDR from 120dB.|
|Electronic shutter lag||from 1/100 s;slow shutter support.|
|Video bitrate||for the resolution of 1920x1080px – 4 MBit/sec;for the resolution of 1280x720px – 2.5 MBit / sec.|
|Environmental conditions||from -40 ° С to + 55 ° С (for video surveillance cameras) and from 0 ° С to + 55 ° С (for CCTV cameras of internal execution).|