DORI (Detection, Observation, Recognition, Identification) How To Measure How Far a Surveillance Camera Can See?

The DORI  or Detection, Observation, Recognition, Identification standard that is a standard for how far a camera will see and is based on the IEC EN62676-4: 2015 International Standard. Unlike DRI Johson Criteria which is for thermal cameras DORI is designed for visible and uses PPM  (Pixels Per Meter) to define what Detection (25PPM), Observation (62PPM), Recognition (125PPM), and Identification (250PPM) are for visible light surveillance cameras. By using these PPM values, it is possible to select a specific camera sensor/lens combination and verify that it will provide the performance needed in each application based on the criteria given above. 

Detection 25PPM- The detection level allows for reliable and easy determination of whether a person or vehicle is present.

Observation 62PPM - The observation level gives characteristic details of an individual, such as distinctive clothing, while allowing a view of activity surrounding an incident.

Recognition 125PPM - The recognition level determines with a high degree of certainty whether an individual shown is the same as someone that has been seen before. 

Identify 250PPM - The identification level enables the identity of an individual beyond a reasonable doubt

Just scratching the surface
We wrote this white paper in an effort to explain the rating systems we
use while also giving end users an idea of the actual performance they can
expect from their thermal and visible/NIR cameras. That said, this information
just scratches the surface of the many considerations that go into building
long-range surveillance cameras.

In addition to VIS/NIR and thermal, Infiniti also offers active IR illumination,
SWIR, and other sensors such as LRF, Radar and more. We do not limit our
customers to any one technology; rather we custom build solutions that
typically use multiple sensors depending on the project.

There are also many additional aspects to consider when building a camera
system, such as cooled vs uncooled thermal, size and weight, stabilization,
connection and control, environmental and ingress protection, international
trade regulations and more; all of which need to be considered alongside
budget and availability.

At Infiniti we excel at designing customized systems to suit your specific
needs. We can examine your situational requirements, location conditions
and project budget and recommend the best system (or systems) available
within that budget. We are also experienced in configuring multi-camera
systems complete with multichannel recording, wired or wireless networking,
access control, radar integration and more.

Contact us today for our expert advice on the ideal solution for you.

The examples here simulate the amount of detail if you were to digitally zoom into the image. Please note that these image simulations assume optimum imaging conditions, however many factors such as atmospheric conditions, heat waves, available light, subject motion or camera shake can degrade image clarity, and most of these issues are amplified at longer distances.