What is DORI?
DORI stands for Detection, Observation, Recognition and Identification. DORI is based on the international standard IEC EN62676-4:2015, which describes how much detail in pixels per meter (PPM) a surveillance camera must provide to enable four levels of visual perception. This is usually expressed as a distance rating, in meters (or kilometers, miles or feet), and is listed in a camera's technical specifications under DORI Distance:
- Detection (25 PPM): You determine whether something or someone is present. For example, you perceive a shadow, movement, or change in the environment, but without clear details;
- Observation (62 PPM): Recognizing behavior and context. You can observe what's happening and what type of person or object is involved. For example, you see someone committing a burglary, but you can't determine exactly what's happening;
- Recognition (125 PPM): You distinguish a person or object because you're already familiar with it. For example, you recognize your neighbor, a colleague, or a familiar object based on certain characteristics;
- Identification (250 PPM): You can clearly recognize someone, even if you've never seen them before. Think of visible features like scars, tattoos, or skin color. This level of detail is important for situations where reliable identification is required, for example, for legal evidence.
Why DORI
The goal of DORI distance is to provide a rating system to determine the effective detection distance for a camera, depending on the desired level of detail. With DORI, detection requires only 25 pixels per meter (ppm), while identification requires 250 ppm. This means a camera can detect objects at a distance ten times greater than it can identify them.
DORI distance allows you to quickly and easily select the most suitable camera for the object or area you want to observe and the level of detail you want to capture. You can use DORI distance as a basis for making your selection.
As an example, take a look at the Tiandy TC-C321N and compare this camera with other Tiandy-cameras.
Note: Not all surveillance cameras yet specify the DORI distance.
