Resolution is the measure of the detail that you see in your video. This is typically measured in Television Lines(TVL).
With a higher TVL rating, you’ll have better definition, clarity and picture quality. The camera scans an image in a series of lines running horizontally.
Each horizontal line is made up of a number of elements. Resolution is a measure of the quantity of both the horizontal lines and the elements in each line.
The TVL has a direct correlation to the number of pixels on the CCD image sensor. Resolution measures the number of horizontal lines a camera uses to produce an image.
Horizontal resolution measures the number of elements making up each horizontal line.
Vertical and horizontal resolutions usually yield a 3:4 ratio relationship (for example, 600 vertical lines to 800 elements in each line).
The higher the camera’s resolution, more detail is visible because the lines are closer together and there are more elements in each individual line.
TVL gives you an "apples to apples" comparison between cameras. Picking a camera with a higher TVL resolution will ensure greater clarity and detail will be visible in your video images.
