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Could somebody tell me what TV lines are


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#1 Richardson Leao

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Posted 25 April 2008 - 03:37 AM

Hi All,

sorry for my ignorance but I need a video camera to do a film scanning device and I am a bit confused with the terminology. What is the advantage of a camera with more TV lines? And would the TVL be equal to the pixel resolution of the ccd, let's say, PAL, 720x5andsomething, wouldn't the no. of vertical lines be equal to=5andsomething? But I've seen cams that have 470TVL and full frame pal resolution. What does it mean?

Also, just to not bother u twice, can someone indicate for me a nice PAL video capture comp card (for uncompressed video or DV25 compression - NO MPEG).

Thanks heaps!
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#2 John Sprung

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Posted 25 April 2008 - 02:45 PM

TV lines are a measure of resolution that originated in the early analog TV days. They would shoot charts consisting of alternating black and white lines of equal width. Originally it was line pairs per picture height, both for vertical and horizontal. But counting individual lines rather than pairs gives you a bigger number, so the marketing departments seem to like that way better now. ;-)




-- J.S.
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