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Wide Dynamic Range
Panasonic security/surveillance cameras have processing functions that can display objects in both bright areas and dark areas to solve this problem.
What's Dynamic Range ?
The range of the areas show the illuminance range, and the ratio of this brightness is expressed in decibel [unit:dB].
The table on the right shows the relation between illuminance ratio and dB.
Reference : dB = 20 log ( Brightest [lx] / Darkest [lx] )
Illminance and Dynamic Range
Lux [lx] is used as an index representing this illuminance.
This indicates the amount of light per unit of time.
As a guide, the moonlight of the full moon is about 0.2 lux.
Also, if trying to see the bright part like the image of "B", the dark part can not be seen.
In such a wide range-contrast environment, it is possible to generate an image with appropriate brightness by combining a dark image and a bright image. (WDR Function)
The security / surveillance camera with a WDR function like the image of "C" can record clear images in bright and dark areas by combining bright and dark areas.
144dB Super Wide Dynamic Range(Super WDR)
In a room with large windows, the face of the person in the room looks dark for the backlight.
Although raising the brightness makes the face visible, there is a disadvantage that the background image blown out highlights.
Panasonic's Super WDR synthesizes images at different shutter speeds, You can see both brigth areas and dark areas.
Shoot brightly in dark places with a slow shutter speed and shoot so that it does not blown out highlights in bright places with fast shutter speed.
By combining these different shutter speed images, a wide dynamic range is realized.
The Panasonic EXTEME series security / surveillance cameras achieve 144 dB, which is over 133 dB of the conventional.
Reference : Security/surveillance camera products (WDR)