This is due to pixel density being much higher on the sensor with the 6mm lens (less wide and less tall field of view with same number of pixels).
The DORI distance is calculated based on sensor specification and lab test result according to EN 62676-4 which defines the criteria for Detect, Observe, Recognize and Identify respectively.įor example, here are the DORI distances for the same 4.0MP camera with 2.8mm, 3.6mm, and 6mm lenses:įrom above you can see that a 4.0MP camera with 6mm lens and Horizontal 83° and Vertical 31° field of view can identify someone at 12m whereas a 2.8mm lens with Horizontal 104° and Vertical 57° field of view requires the person to be 4m from the lens to identify them. The DORI distance is a “general proximity” of distance which makes it easy to pinpoint the right camera for your needs. DORI stands for Detect, Observe, Recognise, Identify. Most of our cameras have been classified using the DORI system. Stay with us, there is a system that makes this easier to understand. This means that an object may be further away than a lower pixel density camera and still have more detail on the object. Higher pixel density results in more detail. This can be expressed as a formula: Pixel Density = Horizontal Field of View / Number of Pixels (H) Field of view impacts on the definition of the recorded video as the wider the field of view for the same number of pixels, the less detail is recorded (the same number of pixels has to record a larger area).
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