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KnowledgeSeeker
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Post subject: Noob question  Posted: Thu Jan 01, 2009 9:21 pm |
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Joined: Nov 2008
Posts: 4
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Hi there, i just started to learn what is CCTV all about. so do anyone of you mind to tell me what does TVL mean? Is there any big difference between a dome camera with 380TVL and 480 TVL?
Spec below which 1 better resolution, save cost,clear view? eg: for Day use . Does TVL's value effect the output? Please assist me. Thank You.
1)
IR Space Dome Camera (380TVL)
1/3" SONY Super HAD CCD, 380TVL, 3.8mm Fixed Lens,
AWB, AGC, 100mm dome size, 2-Axis, 12VDC,
24 LEDs, 1 CdS Sensor, 0.00Lux(IR LED On)
IR LED's Visibility Range : 15 meter (850nm, 30˚)
and
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1/3" SONY Super HAD CCD, 480TVL, 3.8 mm Fixed lens,
AWB, AGC, 85mm dome size, 2-Axis
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Sawbones
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Post subject: Posted: Thu Jan 01, 2009 10:10 pm |
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Joined: Aug 2008
Posts: 531
Location: USA, below the Mason Dixon
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TVL is "TV Lines," and is loosely analogous to resolution.
So the more, the better.
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cctvexpert
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Post subject: Posted: Sun Jan 04, 2009 1:15 pm |
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Joined: May 2004
Posts: 117
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The more lines, the closer the lines together and the closer the lines together the higher the potential video quality.
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ispy4u2
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Post subject: Posted: Mon Jan 05, 2009 12:56 pm |
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Joined: Dec 2008
Posts: 25
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Since the topic has been addressed on TVL, what is your camera requirements?
Indoor or Outdoor?
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ak357
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Post subject: Posted: Mon Jan 05, 2009 1:14 pm |
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Joined: Nov 2005
Posts: 899
Location: Canada
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cctvexpert wrote: The more lines, the closer the lines together and the closer the lines together the higher the potential video quality.
What determines how close are lines ?
Thanks
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cctvexpert
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Post subject: Posted: Sun Jan 11, 2009 7:31 am |
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Joined: May 2004
Posts: 117
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what determines how close lines are together is the resolution that has been selected
CIF is 352 x 240
2CIF is 704 x 240
4CIF is 704 x 480
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