The basic concept of WDR, what is WDR?

Wide dynamic range (WDR) is an abbreviation for Wide Dynamic Range, which means wide dynamic range.

In the figure below, the image on the right is taken by a wide dynamic range camera.

In simple terms, dynamic range is the range of brightness values for the brightest and darkest objects that can normally display details in the same frame captured by the camera. The greater the dynamic range, the more likely it is that objects that are too bright or too dark will display properly in the same frame.

According to the encyclopedia, when the high brightness area and the shadow, backlight and other relatively low brightness areas under the illumination of strong light sources (daylight, lamps or reflections, etc.) exist at the same time in the image, the bright area of the image output by the camera will become white due to excessive **, and the dark area will become black due to insufficient exposure to pure light, which seriously affects the image quality. The camera has limitations on the brightest and darker areas of the same scene, and this limitation is commonly referred to as "dynamic range".

WDR is a technical term for a camera, and in layman's terms, it is the ratio of the brightest and darkest areas of an image when it can be seen clearly. When the flashlight shines directly into your eyes, you can't see the scene around the flashlight clearly, because the human eye is not wide and dynamic enough. In order to deal with this problem, the camera generally adopts secondary technology, the flashlight time is shorter, so that it is not too bright, and the time around the flashlight is longer, so that it is not too dark, and finally the two are combined through the algorithm to make the brightest place and the darkest place can be seen clearly.

The better the WDR, the wider the range of brightness that can be recognized.

WDR is a technique used to allow the camera to see the features of an image in a very strong contrast. When the high brightness area of Zen Li is disturbed under the illumination of a strong light source (daylight, lamps or reflections, etc.) and the relatively low brightness areas such as shadows and backlights exist in the image at the same time, the bright area of the image output by the camera will become white due to excessive **, and the dark area will become black due to insufficient **, which seriously affects the image quality. The camera's performance of the brightest and darker areas in the same scene is limited, and this limitation is commonly referred to as "dynamic range".

Ultrawide dynamic range is a very strong contrast that allows the camera to see the image in a particularly bad color.

WDR cameras are dozens of times more than traditional cameras with only 3:1 dynamic range. Natural light is arranged from 120,000 lux to the starry night.

When the camera looks out of the window from indoors, the illumination of the interior is 100 lux, while the illumination of the outside landscape may be 10,000 lux, the contrast is 10,000 100 = 100:1. This contrast can be easily seen by the human eye, because the human eye can handle 1000:

1 contrast ratio, however, the traditional CCTV camera will have a big problem with handling it, the traditional camera only has a 3:1 contrast performance, it can only choose to use the 1 60 seconds electronic shutter to get the indoor target correct**, but the outdoor image will be cleared (all white); Or alternatively, the camera chooses 1 6000 seconds to achieve a perfect outdoor image**, but the indoor image will be cleared (completely black). It's a trap of luck that has been around for a long time since the invention of the camera. And the beam.

WDR is a feature that allows the camera to see the image in very strong contrast. WDR cameras are dozens of times more than traditional surveillance cameras with only 3:1 dynamic range.

Natural light is arranged from 120,000 lux to the starry night. When the surveillance camera looks out of the window from the inside, the indoor illumination is 100 lux, while the illumination of the outside scenery may be 10,000 lux, the contrast is 10,000 100 = 100:1.

WDR cameras are also known as ultra-WDR cameras.