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TV Lines

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 . 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

TVL.pdf

TVL is defined as the maximum number of alternating light and dark lines that can be resolved. A resolution of 400 TVL means that 200 distinct dark lines and 200 distinct white 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.