What is WDR in CCTV system and what are its types?

In the context of a CCTV system, WDR (Wide Dynamic Range) refers to a feature or technology that helps cameras capture high-quality images in scenes with varying lighting conditions. It allows the camera to handle situations where there are both bright and dark areas in the same frame, ensuring detailed visibility across the entire image.

WDR technology in CCTV systems typically utilizes one of the following methods:

• Digital WDR: This method involves software-based image processing techniques. The camera captures multiple frames of the same scene with different exposure levels. Then, algorithms combine the properly exposed parts of each frame to create a single composite image with a balanced exposure. Digital WDR is often more affordable and commonly found in many CCTV cameras.

• True WDR or Wide Dynamic Range Sensors: True WDR cameras employ specialized image sensors with a wider dynamic range than standard sensors. These sensors can capture a greater range of light intensities, from bright highlights to dark shadows, in a single frame. True WDR sensors are designed to handle challenging lighting conditions and provide superior image quality with enhanced details in both bright and dark areas. However, cameras with true WDR sensors tend to be more expensive.

It's essential to note that the terminology and specific features may vary among manufacturers. Some may use different terms like "Super WDR" or "Ultra WDR" to describe their technologies, but the fundamental purpose remains the same: to capture clear and well-exposed images in scenes with varying light levels.