A surveillance system is only as valuable as the evidence it can provide.

At Castle Security Systems, we design and deliver commercial and industrial video surveillance solutions designed around your specific risks, operations, and security objectives.

Unlike traditional camera installations focused on simply adding coverage, we apply proven design principles to ensure every camera has a purpose - strategically positioned, configured, and optimized to deliver the level of detail required when it matters most.

Using industry-recognized DORI performance criteria, we design systems that achieve defined outcomes - from detecting activity and observing events to recognizing individuals and identifying critical details.
The result is more than a camera system. It is a purpose-built security solution designed to protect people, assets, and operations with confidence.

DORI (Detection, Observation, Recognition, Identification)

What is DORI?

DORI is a standardized framework used in video surveillance to describe and quantify a camera’s ability to capture detail at various levels - Detection, Observation, Recognition, and Identification. It provides a practical performance benchmark for matching camera capabilities to operational needs in security, defense, and monitoring systems.

Relationship to Other Standards

Adopting DORI helps ensure that surveillance systems meet intended operational outcomes - for example, identifying a face at an entry point or detecting motion at a perimeter. It enhances interoperability, procurement clarity, and regulatory compliance within the global security industry.

About DORI

Application in Surveillance Design

DORI is a standardized framework used in video surveillance to describe and quantify a camera’s ability to capture detail at various levels: Detection, Observation, Recognition, and Identification. It provides a practical performance benchmark for matching camera capabilities to operational needs in security, defense, and monitoring systems.

System designers use DORI values to determine camera placement, lens selection, and resolution requirements. By linking pixels per meter to scene width and sensor resolution, they can predict at what distance each DORI level is achievable. This allows optimized coverage while balancing cost, bandwidth, and storage.

Practical Significance

Adopting DORI helps ensure that surveillance systems meet intended operational outcomes - for example, identifying a face at an entry point or detecting motion at a perimeter. It enhances interoperability, procurement clarity, and regulatory compliance within the global security industry.

Standard Information

Key Facts
  • Standard basis: European Committee for Standardization EN 62676-4 (derived from IEC 62676-4).
  • Purpose: Defines measurable image detail levels for camera selection and system design.
  • Measurement unit: Pixels per meter (ppm).
  • Primary domains: Video surveillance, perimeter security, law enforcement, and public safety.
Relationship to Other Standards

DORI is part of the EN/IEC 62676 video surveillance standards series, which establishes performance guidelines for digital CCTV systems. Unlike older qualitative models, DORI provides an objective, quantifiable framework enabling consistent specification and testing across manufacturers.

Framework and Definitions:

The DORI model divides image quality into four operational levels:

  • Detection: Ability to reliably see an object’s presence (≈25 ppm).
  • Observation: Ability to determine characteristics or movement (≈62 ppm).
  • Recognition: Ability to classify an object type, such as identifying a person vs. a vehicle (≈125 ppm).
  • Identification: Ability to recognize a specific individual or object (≈250 ppm). These thresholds provide standardized reference points independent of subjective interpretation.

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