Toshiba IKS-WB9518 Manual

Toshiba Overvågningskamera IKS-WB9518

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Side 1/4

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 PPF 40 PPF More 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.

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

PPF DECREASES AS DISTANCE INCREASES

The “field of view” or FOV refers to the physical limits on the visual boundaries you are viewing. In the case of a security camera,

the field of view is impacted by two factors:

1. the focal length of the lens

2. the size of the imaging sensor

The lens determines the field of view captured. A wide angle lens will view objects that are close to the camera, while a telephoto

lens will see objects further away. The higher the focal length (mm) of the lens, the more magnification. The lower the number, the

wider the angle of view. When you use a high resolution camera you must select a high resolution or Mega-pixel lens that will

maintain the high resolution. We suggest using one of the many available online lens calculators that will help determine the dis-

tance to the object, width of the field of the view and lens focal length (f in mm).

The is the distance across the image while refers to the height of the image. Typically, the vertical fieldhorizontal field vertical field

of view is approximately 70 percent of the horizontal field of view. Therefore, the total field of view is more like an angular field

where the further you get from a camera, the wider the field becomes and the lower the PPF. The FOV must be set up so that

the widest scene width (furthest away) still gives the correct PPF, especially for good facial images. In general, a PPF of 10 is

usable for tracking of motion. A PPF of 20 will work for general security applications, while a PPF of 40 provides forensic level

details. A PPF of 60 or above delivers highly detailed images. Identifying a face in some circumstances may require a PPF over

200 to capture minor details like scars, eye color or tattoes, depending on lighting.

Produkt Specifikationer

Mærke:	Toshiba
Kategori:	Overvågningskamera
Model:	IKS-WB9518

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