SDNR ( Super Digital Noise Reduction )

A DVR’s recorded file size is reduced by a massive 70% when using a MPEG format and by 40% when using a JPEG format.

Super Digital Noise Reduction (SDNR) is designed to do what it says; reduce noise in video images, especially under low light conditions.

Reduced noise in video images has a number of effects.

Firstly, images are cleaner, sharper and retain more detail, and as the whole reason for using CCTV systems is to capture and use images, this is certainly a desirable benefit.

Secondly, when images are captured in low light applications, it is usually the high levels of noise which make them unusable.  Therefore, if the level of noise can be eliminated, or even greatly reduced, the performance of a camera will obviously be greatly enhanced.

Finally, reduced noise can help to keep image file sizes down when recorded digitally.  This is because image compression works by looking for redundancy in images.  This can either be a lack of motion and change, or areas of continual tone, depending upon which algorithm is being used.  However, image noise is perceived by the compression engine as being change or a varied area of tone, and subsequently file sizes are larger as there is less redundancy.  However, where noise is eradicated, image file sizes can be greatly reduced.

As such, SDNR not only benefits the system with regard to image capture, but also in regard to low light performance and digital video archiving.  Therefore, it does represent a significant step forward...