How is Wide Dynamic Range (WDR) Measured?

Measuring wide dynamic range

Understanding how WDR technology works in varying environments is an essential factor in ensuring that it’s as effective as possible. Developing WDR requires a specific scientific approach to tackle the challenges posed by different lighting conditions and environments. While WDR may not always function correctly in extreme lighting conditions, it can help to reduce the environmental effects on the recorded footage.

The science behind it involves measuring illuminance and brightness (in decibels) to manage the lux, which refers to the light level at a given time of the day.

Decibels	Darkest to Brightest Ratio
10 dB	20
100 dB	40
1000 dB	60
10000 dB	80
100000 dB	100

Measuring decibels is critical since it’s the industry standard for the kind of sensor a camera requires. Conversely, lux doesn’t require matching measurement but will match a given scenario. For instance, .2 to 1 lux is equivalent to a night with a full moon, 500 to 1000 lux is typically an office environment, and 100,000 lux represents direct sunlight.

This information is crucial for manufacturers to develop technology that suits normal environments. While our eyes are sensitive to a wide range of light, most security cameras aren’t unless equipped with WDR technology. Regular offices, rooms with windows, garages, and typical work environments typically use normal WDR to combat glare and dark spots. Meanwhile, areas like lobbies, corridors near outdoor entrances, or areas prone to car light beams require super-wide dynamic range cameras.