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Pixels Per Foot

A beginner’s guide to PPF

What is the role of PPF in selecting an IP camera?

Ensuring high quality surveillance IP video can be a challenge — beginning with specifying cameras to achieve the level of quality

needed for operational requirements. The traditional way of specifying surveillance cameras was by resolution, for example

selecting a 1080p model over a 720p for a critical area. However, this method has proven inexact, resulting in too much or too lit-

tle quality. A newer, more accurate way is to specify pixels per foot (PPF) density. While some may find this new method confus-

ing or complex, the mathmatics behind it are actually quite simple as this brief will explain.

CALCULATING PPF

The formula for calculating PPF is . Let’s look at an example: the installer has aHorizontal Pixels divided by Field of View width

2MP IP camera with a resolution of 1920 (H) x 1080 (V). The Horizonal Field of View for the area being monitored is 100 feet wide.

Therefore, PPF is 19.2 based on 1920 divided by 100. But is 19.2 PPF enough? Is it too much? Let’s look:

Toshiba America Information Systems, Inc. Surveillance & IP Video Products www.toshibasecurity.com ||

19.2 PPF40 PPFMore than 40 PPF

Image lacks detail with

little or no facial feature

recognition and a non-

readable license plate.

Not all facial features

can be made out. Plate

numbers can be read

but not state.

Clearly can see all

facial features, and can

read license plate num-

bers and state.

Obviously, the more pixels, the higher the resolution and the easier it is to recognize faces and license plates. The down-

side is that higher resolution requires more bandwidth and storage space.

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