Generating high quality images in low light conditions is a fundamental and essential element of video surveillance camera, and noise reduction technology is especially important for network-based video surveillance camera in order to optimize transmission and storage efficiency. In extreme low light environment where the amount of light is insufficient, the level of noise remains the same while the components of image signals decrease, ultimately resulting in greater noise effects. High level of noise degrades the image discrimination power and increases the size of the data when compressing image, which causes reduction of transmission and storage efficiency.
Through SSNR (Smart Super Noise Reduction), Hanwha Techwin’s unique low light image process technology, we are able to provide clear color images in dark environments with limited light by effectively reducing the noise and by minimizing the afterimage (motion blur) of objects. Through this, the size of image data is also significantly reduced allowing efficient storage and network transmission.
Low Light Level Image Processing Technology
First, in a low light environment, it is critical to design a lens capable of minimizing the loss of light to deliver maximum amount of light to the sensor.
Hanwha Techwin’s own accumulated optical design technology made it possible to achieve the world’s best F0.94 lens design technology for ultra-low light camera.
Nighttime Color Image Comparison between Previous Model (top/ 1/2.8” 2M, F1.4) and Wisenet X extraLUX Series XNO-6085R (bottom/ 1/1.9” 2M, F 0.94)
Second, it is necessary to have a high sensitivity sensor which reacts well, even in low light environments.
Hanwha Techwin’s extraLUX Series, a family of Wisenet X Series, is featured with 1/1.9" sensor that has outstanding sensitivity and Signal to Noise Ratio (SNR) to provide excellent performance for low light environments.
Nighttime Color Image Comparison between Previous Model (left) and Wisenet X Series (right)
Third, high complexity image processing technology is required.
Based on many years of experience in the image processing industry, Hanwha Techwin has developed a high performance noise reduction technology and an image correction technology which maintains brightness, color reproducibility and sharpness in extreme low light environments. We have put together these technologies and named it Smart Super Noise Reduction (SSNR) technology. Hanwha Techwin’s SSNR is an advanced spatio-temporal noise reduction technology optimized for video surveillance cameras.
Noise Reduction Application – Before (top) / After (bottom)
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