Wide Dynamic Range
The wide dynamic range this is a feature used by cameras with the IP network which includes variations of a scene’s lighting condition. Sometimes we want to take photographs in a room whose lighting is directed to a particular part of the room which will make some places bright and others darker than they are supposed to be. For example, instinctually a person can decide to go to the window in other to get a good shot. In this situation, a normal camera would pick only the person in front of the window while the background of the picture will be nothing but darkness. A camera with the wide dynamic range feature processes the image in a way that all the background and foreground objects are visible together regardless of their lightening conditions.
How it Works
Because cameras can only capture what is under the balanced lightening conditions between high contrast and low contrast overexposed or underexposed images tend to be difficult to capture when using the normal camera.
WDR technology cameras have developed sensors that produce a wide area of lightening which allows them to record in a greater light frequency.
Together with recording wider lightening area more precisely, the WDR-enhanced camera has two other ways of weighing the lights to get better pictures. Mapping of tones let the camera or software brighten dark areas or darken light areas automatically.
How it Works
In other words, the camera takes plenty shoots a scene at different levels of exposure. This creates identical images in both the exposed and underexposed which the camera joins together. The recorded image you see is created by taking the most balanced parts of both images. This system requires very fast and very light sensitive sensors and is only advantageous to professional cameras.
There are numerous monitoring conditions that cause different lighting scenes. The most challenging situation is when there are lots of differences in the level of lights consecutively in a scene which is commonly referred to as WDR (wide dynamic range) scene.
EXAMPLES OF THIS SITUATION INCLUDE:
- Vehicles that enter tunnels or parking lot, with daylight and low level of light indoor.
- Surroundings with lots reflections (light), e.g. office buildings with plenty windows or shopping malls.
- Monitors for entrance doors with daylight outside and a dark indoor surrounding. This is very common in office and retail applications.
- In the city surveillance, transportation and perimeter surveillance and other outdoor applications in which a part of the scene us under direct sunlight and another part is in deep shadow.
- Vehicles with strong headlights, driving directly towards the camera.