D.O.R.I. stands for Detect, Observe, Recognize, and Identify, and it is a classification system used in surveillance and security applications to describe the levels of detail that different video surveillance cameras can provide at various distances. This classification helps in selecting the appropriate camera for specific security needs. Here’s a detailed explanation of each component:




  • Purpose: To determine if there is a presence of a person or object in the field of view.
  • Typical Use Case: General surveillance where the primary goal is to be alerted to the presence of activity.
  • Detail Level: The image quality is sufficient to notice movement or presence but not enough to see detailed features.
  • Distance Example: A camera might detect a person at a distance of 50 meters.


  • Purpose: To monitor activity and understand what is happening in the area.
  • Typical Use Case: General monitoring where there is a need to see the context of actions without requiring detailed facial features.
  • Detail Level: Provides a clearer view than detect, allowing observers to understand the actions of people and objects.
  • Distance Example: A camera might observe activity at a distance of 30 meters.


  • Purpose: To recognize familiar individuals or objects.
  • Typical Use Case: Areas where it is necessary to identify familiar faces or objects but not in great detail.
  • Detail Level: The image quality is sufficient to recognize known individuals or objects, such as identifying employees or distinguishing between types of vehicles.
  • Distance Example: A camera might recognize a person at a distance of 15 meters.


  • Purpose: To clearly identify individuals or objects, providing detailed facial features or other identifying characteristics.
  • Typical Use Case: High-security areas where clear identification is crucial, such as entrances to restricted areas.
  • Detail Level: The highest level of detail, allowing for clear identification of individuals and objects, similar to the quality needed for use in court or law enforcement.
  • Distance Example: A camera might identify a person at a distance of 5 meters.

Practical Applications

The D.O.R.I. standard helps security professionals and system designers choose the right cameras and place them optimally to meet specific surveillance objectives. For example:

  • Perimeter Security: Use cameras with a good “Detect” range.
  • Parking Lots: Cameras with “Observe” capabilities can monitor general activity.
  • Building Entrances: Cameras with “Recognize” or “Identify” capabilities ensure clear identification of individuals entering and exiting.

By understanding these levels, we can better plan the design and installation of your surveillance systems to ensure they meet the necessary security requirements.