Television lines
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It has been suggested that this article or section be merged with Lines of resolution. (Discuss) Proposed since November 2011. |
Television lines (TVL) is a specification of an analog camera's or monitors's horizontal resolution power. It is alternatively known as Lines of Horizontal Resolution (LoHR), aka lines of resolution [1]. The TVL is one of the most important resolution measures in a video system. The TVL can be measured with the standard EIA-1956 resolution chart[2].TVL also makes a variation on horizontal angle of display from a video camera, i.e. The more the TV Lines depending on the size of lens, the smaller/narrower the angle of coverage but better picture quality.
TVL is defined as the maximum number of alternating light and dark vertical lines that can be resolved per picture height.[3][4] A resolution of 400 TVL means that 200 distinct dark vertical lines and 200 distinct white vertical lines can be counted over a horizontal span equal to the height of the picture. For example, on 4 x 3 inch monitor with 400 TVL, 200 vertical dark lines can be counted over 3 inch width on monitor (Note that the 3 inch of monitor height is used rather than the 4 inch of whole monitor width).
TVL is an inherent quality of a camera or monitor and should not be confused with the horizontal scanning lines of broadcast television systems, which e.g. for a PAL system are 625 lines, and for the NTSC system 525 lines.[5]
TVL also makes a variation on an angle of display from a video camera, i.e. The more the TV Lines depending on the size of lens the smaller the angle of coverage but better picture quality.
[edit] See also
[edit] References
- ^ Video Demystified, 4th edition ISBN 0-7506-7822-4
- ^ QA-70-1 Video Resolution Pattern (EIA-1956) Product Specifications
- ^ Overview and resolution
- ^ White Paper: Understanding Image Resolution
- ^ Overview and resolution
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