Understanding DORI Standard in CCTV

Understanding DORI Standard in CCTV

Currently, the role of CCTVs in the world of security is undeniable. Moreover, it’s probably safe to say that the main usage of CCTVs right now is for security reasons. 

Used for monitoring your assets to surveying activities, just the presence of CCTV cameras in your area could highly reduce the chances of security incidents happening. 

Even more, if any security incidents still ended up happening, footage captured from your CCTV cameras could be used to help find the cause of it and used as evidence for criminal activities. 

As technology developed, variations of CCTV cameras available in the market (such as Dome, Turret, or PTZ cameras just to mention a few) increased. Each with its own advantages and disadvantages, and price ranges.

With that many choices that come with varying prices you might be asking “Which CCTV cameras could secure my assets optimally?”. 

A very good question that you need to ask prior to setting up your CCTV camera. Because at the end of the day, CCTV is an investment you make to help you secure anything that you want to secure. 

The last thing you wanted to do is make an investment in a CCTV camera and then ask questions such as, “Why does my CCTV camera didn’t work as I thought it would?” or “Why does the image look blurry?”.

Well, one thing that you should remember is that a CCTV camera is still a device, and the optimal use of a device depends on the ability and the knowledge of the one using it. 

So, with CCTV cameras, one of the most important things you need to understand is the DORI. 

What is DORI?

In the “dictionary” of CCTV cameras, DORI stands for:

  • Detection
  • Observation
  • Recognition
  • Identify

It is a standard (IEC EN62676-4: 2015) given by the International Electrotechnical Commission or IEC to determine the ability of CCTV camera lenses in capturing images by using PPM (Pixels Per Meter) as the unit of measurement.

Higher PPM number means a clearer image captured by the CCTV camera, and the distance that a camera could achieve a certain PPM number depends on the capacity of its lens.

This ability of capturing images at a certain PPM number determines if an object could be detected, observed, recognized, and identified. 

Then, what’s the difference between detection, observation, recognition, and identification and what’s the standard PPM numbers given for each of those levels?

The DORI Level Explained

It’s easier to explain the different levels in the DORI by using an example. 

Below is the DORI specification of a 6 MP CCTV camera that has two choices of lenses (2.8 mm lens and 4 mm lens). 

Detection (25 PPM)

The detection level is where the CCTV operator will be able to detect the existence of a person or vehicle. The PPM number required for the detection level is 25 PPM.

In this case, the 6MP CCTV camera with 2.8 mm lens will only be able to detect a certain object as a person or a vehicle if the said object is within 71.3 meters from the camera. 

While the 4 mm lens will already be able to detect the said object within 92 meters from the camera. 

Observation (62 PPM)

At the observation level, the CCTV operator will be able to observe certain characteristics of the person – such as the clothing worn by the person – or the vehicle. 62 PPM is required in the observation level.

With the 6MP CCTV camera, the observation level can be achieved at 28.3 meters using the 2.8 mm lens or 36. 5 meters with the 4 mm lens. 

Recognition (125 PPM)

In the recognition level, the CCTV camera operator will be able to recognize the person (they might be someone that the operator has seen before), or the vehicle captured by the camera. 

In certain conditions, the license plate of the vehicle could also even be seen clearly.

The PPM number required for this level is 125 PPM

So, the CCTV operator using this CCTV camera will be able to recognize the person or vehicle if it is within 14.3 meters using the 2.8 mm lens or 18.4 meter using the 4 mm lens. 

Identification (250 PPM)

The last level in the DORI is the identification level that is achieved with 250 PPM. In the identification level, the CCTV operator will be able to identify the person or the vehicle beyond a reasonable doubt.

Using the 6 MP CCTV camera, the CCTV operator will be able to identify the person or the vehicle once it is within 7.1 meter from the camera if using the 2.8 mm lens. 

The 4 mm lens will already be able to achieve 250 PPM if the person or the vehicle is within 9.2 meter from the camera. 

Nawakara Understand Your Needs

Having the knowledge of DORI will help you choose the best camera and its lens that suit your needs. 

But there are still a lot of things (such as sensors used, stabilization, shape and size) to consider to really make sure that your CCTV camera will function optimally in securing your assets.

In Nawakara, CCTV is part of our Electronic Security System integrated security that are tailored to your needs. 

Every place has their own security risks and challenges. Prior to offering our products, we will conduct field research to do an assessment of the risk factor and difficulty level you face. This is done to mapped areas that needed high protection. 

After that we will recommend the best CCTV cameras with the purpose of eliminating blank spots and maximizing your assets security. 

These spots that we recommend are what we thought to be crucial and vital, such as high traffic areas (for example, lobbies or receptionists’ areas), that will ensure your daily operations will run smoothly. 

More than that, our Electronic Security System could also be integrated with Nawakara Command Center service that works 24/7 to secure your business. 

Contact us through this link for further information. 

Our experts will ensure that your CCTV security will function optimally from every aspect, including the DORI, tailored to your needs. 

In all shape or type, CCTV is an important part of Nawakara’s integrated security solution within the Nawakara Plan-Prevent-Protect framework. 


Our team are ready to serve you

Send Questions