In the realm of CCTV, “DORI” represents Detection, Observation, Recognition, and Identification.
- Detection – This level ensures accurate and straightforward identification of the presence of a person or vehicle.
- Observation -The observation stage provides specific details about an individual, such as unique attire, while offering a view of the activities surrounding an event.
- RecognitioN -At the recognition stage, it is possible to determine with a high level of certainty whether an individual shown is the same as someone previously encountered.
- IdentifY – The identification phase facilitates the recognition of an individual’s identity.
What is the DORI standard system?
The DORI standard system, which aligns with the IEC EN62676-4: 2015 International Standard, outlines various levels of detail for Detection (25PPM), Observation (62PPM), Recognition (125PPM), and Identification (250PPM) in visible light surveillance cameras. These PPM values allow for the assessment of cameras based on their sensor/lens combination to ensure they meet the necessary performance criteria for each specific application. Manufacturers commonly present the minimum DORI results on their camera datasheets.
When and why use DORI results?
The DORI distance serves as a “general proximity” measure, simplifying the process of selecting the ideal camera for your requirements.
For instance, below are the DORI distances corresponding to a 4.0MP camera with 2.8mm, 3.6mm, and 6mm lenses:From the information provided, it is evident that a 4.0MP camera equipped with a 6mm lens can recognize an individual at a distance of 12m, whereas a 2.8mm lens requires the person to be 4m away from the lens for identification. This difference is attributed to the higher pixel density on the sensor with the 6mm lens.
By increasing the pixel count, the range over which a person can be identified expands. For instance, an 8.0MP camera with a 2.8mm lens offers the following DORI Distance: Detect (25px/m) 69m, Observe (63px/m) 28m, Recognize (125px/m) 14m, Identify (250px/m) 7m. This represents an enhancement compared to the 4MP camera with the same lens, increasing the identification distance from 4m to 7m. Opting for the 8MP camera would be suitable for a broader view and the capability to identify someone 7m away from the camera. Additionally, choosing a motorized camera allows for lens adjustments to optimize sensor utilization by focusing solely on the targeted area or object, thereby increasing pixel density, as a reminder, narrowing the field of view enhances pixel density.
Therefore, DORI Distance provides a simple and efficient method to select the most appropriate camera based on the object or area under observation and the desired level of detail for recording.
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- Detection – This level ensures accurate and straightforward identification of the presence of a person or vehicle.
