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Signal distortion, or "noise", is an unavoidable by-product of amplifiers in digital processing for cameras. Even when working at optimal level, digital amplifiers, whether used in audio or video applications, create some noise. This happens in both Analog CCTV cameras, digital SDI cameras and IP security cameras since all use some signal gain software. 

Video "noise" can take the form of "static", fog, speckles (Snow), haze, fuzz, transparent color blocks and other visual artifacts that make your security camera images look less than crystal clear. Therefore noise reduction is an important aspect of surveillance camera design and selection. It becomes even more important as display technology advances and gives people the ability to view higher resolution images like UHD (4K) and 8K CCTV.

Various methods have been used over the years, implemented through hardware and software, to clean up video generated by CMOS and CCD video sensors. One of the simplest forms of noise reduction compares one frame to the next, and removes any oddities that do not appear in each frame. Complex algorithms determine exactly what is an "oddity" to be removed. This is an example of "temporal noise reduction".

Temporal noise reduction is not sufficient for high resolution imaging, especially if it involves moving objects or low light imaging. 2D-DNR is a form of temporal noise reduction, and was developed to work with low light security camera images that are amplified.

2D-DNR works best to clean up the foreground of an image. This can noticed when you look at security camera footage of a street lamp at night, for instance. The area closest to the security camera will appear to be clear, while areas further away will appear "salt-and-peppery". Moving objects can also be an issue in a strictly 2D-DNR system, and can appear blurry or leave fading trails. Movement can "confuse" the 2D-DNR system. 3D-DNR was designed to remove this limitation.

3D-DNR adds "spatial noise reduction" to 2D-DNR techniques. This type of noise reduction compares pixels within the same frame as well as frame-to-frame. It removes the grainy
appearance of low light images, handles moving objects without leaving trails, and makes images clearer and sharper. All of the amplification processing can also add some levels of motion blur and shutter speed delays so amplification should always be used sparingly.  

Even if image quality is not the main goal, there's another reason to want a camera with good noise reduction. If a security DVR is recording your surveillance camera footage, then it's also recording the noise. Noise, when it reaches your DVR, causes two issues you want to know about.

First, video noise inflates file size, since the DVR is recording the image plus the noise. A predominantly black, night-time image that would normally create a small, compact files would run much larger sue to alternating noise. Compression codecs like h.265 and h.264 will be forced to save all the salt and peppery spots, the haze, and the shifting patterns resulting from noise at much larger file sizes. Over time, file size adds up, and all hard drives have a limited storage space. This is a problem that can be prevent with good WDR.

Second, video noise can trigger motion detection if the DVR is set up to use it. This can cause false alarms, annoying emails from the automated notification system, and create storage consumption complaints.

The continuous balance of amplification through signal gain controls and digital filters like WDR are an important part of the programming steps. Quality control programs like Cortex QC6 insure that your users will enjoy the best settings available.  

Make sure to provide the highest quality cameras you can to your clients before they have these problems. Getting a poor video image is often enough to make people want to buy a high quality camera. If it isn't, paying for more HDD space, or wanting a high quality motion detection system that avoids false positives often changes their minds.

Using the trademark QC6® system, many Cortex security cameras are built from the ground up with balanced 3D-DNR as well as other noise reduction techniques like advanced automatic gain control (AGC), adaptive tone reduction (ATR), high/intense light reduction (HLR), and more. The list includes COR-HD89TRV, COR-HD80V, COR-HD88TRV, and more. 

Call a Sales Representative (888-573-2333) today to see the entire list, and to get wholesale prices!

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Many of Miami’s traffic focused recording systems use DVRs and NVRs with analytic properties that can provide Motion based intelligent functions
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Smart phones like iPhones and android-based Samsung galaxy models are extremely common and utilize apps which allow complete monitoring from remote locations and over 4G and LTE networks.
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Many video card manufacturers are now producing dedicated solutions for multi monitor output and TV wall style deployments.
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Cortex security continually finds new ways to improve on their unique line of CCTV and access control systems. In 2018, Cortex introduced the Medallion series of hybrid DVRs and PoE NVRs that are a perfect compliment to the new 5 and 8 megapixel 4 in 1 coax cameras and 2k / 4k IP cameras joining the line.

4K UHD DVR for coax HD camera and IP PLUS channels

Installers enjoy complete interchangeable models that share the Cortex View apps for IOS and Android mobile devices plus a device management software suite. As more commercial CCTV projects face the threat of improperly deployed retail level surveillance cameras, it is reassuring to find a line of affordable, professional security cameras that can be offered. Along with ease of use and a user-friendly layout, the Medallion Digital video recorders can be configured with legacy analog cameras while providing future proof video inputs up to 4k UHD on Coax and IP channels.

The Cortex Medallion Series has built-in Analog HD signal tuning that enables installers greater fine-tuning for multi-format mixes and cable distance balance. A complete suite of analytics is also accessible from the DVR and NVR interface when integrated with Medallion IP cameras.

The Medallion DVR series can accept signals on coax from AHD, TVI, CVI, and analog plus IP cameras via network connections. Full networkability can be achieved by mixing existing legacy cameras with new HD camera models.

Combined with powerful multi-function HD cameras, the Cortex Hybrid DVRs are well suited for commercial and industrial applications and provide contractors with quality control from our USA based testing centers in Miami, Tampa Florida and Phoenix Arizona. Miami CCTV installers are taking full advantage of these affortabily priced systems that allow them to bring 5MP and 8MP cameras to their everyday customer.

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The new 5MP camera series from Cortex are revolutionary models that can be a perfect fit for many jobs and projects. The intelligent on-board technology supplied allows installers and end users to take full advantage of the latest technology in security cameras. Five megapixel camera models have seriously raised the bar for resolution but more importantly, have truly increased performance in extreme low light situations which is when most crimes occur.
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From digital IP cameras and SDI digital over coax to analog AHD/TVI the Hybix puts the best video quality at your fingertips!Can you correctly identify the resolution?
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3-D printers are everywhere. From limbs and prosthetics for human beings to small chips and plastic filler components on automobiles and airplanes, 3-D accessories that are instantly fabricated are now reality! The security field has also started to dabble in three-dimensional printing technology for accessories or custom creations that would normally require mass production. No longer is there a minimum order requirement for a device that only requires 10 individual sites for a project rollout.

Thank you for taking the time to view our website. As a homeowner, give yourself piece of mind by protecting your home and family. We here at CCTV Core have our "EYE" on surveillance and are here to help you with your security system needs.
Regards, CCTV CORE TEAM More Technical | Security | Training Articles-Pages If you enjoyed this article you may enjoy these.
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Aside from high-security for tourist who expect the highest level of protection when at sea, cruise ship security and surveillance requires additional corrosive resistant properties that sometimes can be a challenge for many suppliers of CCTV and Access control solutions.
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Picking up good video images during the day can be hard enough with all the random factors you can't control, but picking up good images at night is always more difficult. And night time is when people become much more concerned about image pickup. Slow shutter speed is a technique that, essentially, allows the video sensor of a CCTV camera to accumulate enough light to operate in conditions the human eye would perceive as complete darkness. It is sometimes called Sens-up, Sense Up, or similar variations, and depends on controlling the electronic shutter integral to electronic video sensor operation. To understand Sens-up (or Sense Up), you must have at least a basic understanding of electronic shutter operation.

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