Common Terms and Concepts in Video Surveillance and Imaging Systems (Part-2)
Common Terms and Concepts in Video Surveillance and Imaging Systems (Part-2)
19. #Characteristic #Impedance
The Characteristic Impedance of a coaxial cable is the impedance which would be measured on an infinite length of un-terminated open circuit cable. When cables used are less than an infinite length, a resistor of the same value has to be substituted to ensure matching and maximum power transfer. Coaxial cables used in CCTV are designed to have a Characteristic Impedance of 75 Ω.
20. #Chroma #Burst
A reference signal included in an analogue video signal after the horizontal synchronisation line pulse to synchronise the chrominance component of the signal.
21. #Chrominance (C)
The part of a colour video signal that carries all the colour information.
22. #CIF (Common Intermediate Format)
A measurement of image resolution equal to 352 x 288 pixels.
23. #C-Mount
A mounting standard for box camera lenses. The lens flange surface to the focal point is 17.5mm. A C-mount lens can be used on a CS fitting camera when an adaptor ring (5mm) is fitted, or if the camera has sufficient back focus adjustment.
24. #CMOS (Complementary Metal Oxide Semiconductor)
A sensor type found in VSS Cameras.
25. #CODEC (Compressor/Decompressor)
A device that compresses and decompresses digital signals.
26. #Colour Correction Filter
Also known as an IR Cut Filter, it is used to prevent IR light from reaching the image sensor of a camera to make the colour video produced by the camera appear the same as seen by the human eye. Failure to remove IR light from colour images causes the video to look washed out and have a pink tint.
27. #Composite Video
The complete analogue SD or HD video signal. The video signal comprises video and synchronising pulses.
28. #Compression
Techniques used in surveillance systems to reduce file sizes. Typical compression formats used for video are MJPEG, MPEG-4, Wavelet, H.264, and H.265.
29.# CS-Mount
A mounting standard for box camera lenses. The lens flange surface to the focal point is 12.5mm. A CS-mount lens may not be used on a C fitting camera as it will be impossible to focus it.
30. #dB (Decibel)
A logarithmic ratio between two signals. It is not a unit of measurement.
31. #DC (Direct Current)
Direct current is the unidirectional flow of electric charge
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Source: LinkedIn
Credits: Mr. Sujith CM
