Glossary of Terms for Security Camera Systems

TVL (TV Lines)

Analog surveillance video resolution is measured in terms of broadcast TV lines as viewed on a monitor screen. Video quality is charted with converging lines of higher and higher density. The TVL resolution number is the line density where the camera is no longer able to reproduce individual lines. The higher this number is, the better the picture.


TVL Example

The digital recording resolution can be expressed in effective pixel dimensions.

Typical pixel dimensions:

480 TVL 510 x 492
600 TVL 768 x 494
650 TVL 811 x 508
700 TVL 976 x 582

Learn how Digital Recorders interact with TVL images