10 Best Security Camera of 2020

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Surveillance camera guide

Surveillance Cameras – Over time
The camera was developed to take still and moving pictures, initially for film and television. In the 1960s, the development in Europe made a significant step and made the transmission of moving images in good resolution possible. This not only brought the film and TV transmission, but also made it possible to use a camera as a monitoring tool.

Surveillance Camera – More than just a surveillance tool
When talking about a camera as a surveillance tool, it does not mean monitoring only employees or customers in the banking sector. A Security Camera Rather, it provides an additional safety factor, which on the one hand is intended to be a deterrent and, on the other hand, helps in the investigation of criminal offenses. Even in the private sector, the camera is often used for the protection of belongings. The quality of the cameras is also getting better and better in the private sector, helping to identify thieves. Most commercially available surveillance cameras are already including night vision. Thieves have no chance to go undetected.

Types of surveillance cameras
There are different types of surveillance cameras. These are categorized according to the criteria image quality, recording and transmission type. Generally, the following two categories are distinguished:
– Analog cameras
– Digital cameras

Analog cameras transmit their images via cable, while digital cameras are further distinguished according to their transmission paths.

analog Security Camera
Analog cameras were initially not developed for surveillance but to enable filming and to transmit film and television images. In the 60s, the so-called interlace method was developed for smooth image transmission. This method works with the transmission of fields, which are generated as a so-called „frame“ from an image. The transmission frequency of the transmitted half-images is upregulated so far that the human eye perceives them as a camera image or a jerk-free television transmission. Analog cameras are wired, which means the image is wired to a connected one monitortransfer. The standard used with analog cameras is the PAL standard.

PAL standard – or 4: 3 format
PAL is the abbreviation for „Phase Alternative Line“ and describes with the term the above-mentioned interlace method. An image is split into two half-images. Two half images correspond to 625 raster lines and 25 images are transmitted per second. The PAL standard or the interlace method produces images in 4: 3 format. Just like TVDepending on the model, surveillance monitors also show the transmitted image with varying degrees of sharpness in different image qualities. The picture is taken from the Security Camera by coaxialtransferred to one or more monitors. The quality of the transmission ranges from maximum PAL standard to 20% blurred images. Since the 1960s, a lot has happened in electrical engineering and computer technology, and the trend is also moving away from analogue models and towards digital cameras when it comes to acquiring surveillance cameras.

Digital cameras for surveillance
Digital cameras offer many advantages over analogues. Thanks to integrated computer chip and memory systems (CMOS and more), the signals of a digital camera are algorithmically calculated, up-regulated and thus reproduced or reproduced true to the original. Depending on the transmission method of the camera signal or connected monitor, the picture is recorded in HD quality and played back. Depending on the camera filter and built-in functional components, even night shots in top quality are possible. The surveillance cameras available on the market differ not only in their recording quality and functionality, but also in the transmission mode. The images of the cameras can be transmitted in the following ways:
– By coaxial cable
– via LAN connection
– via Wi-Fi
– via powerline connection
– via Bluetooth

Via coaxial cable
Surveillance cameras transmit audio and video signals in HD quality via coaxial cable. HD-SDI, short for High Definition Serial Digital Interface, allows in this way the connection of modern digital cameras with „old“ video monitors. The advantage is that the surveillance cameras can be gradually replaced by digital and the old monitor system does not need to be replaced first. Of course, the transmission via coaxial cable is always upgradable and can be transferred to HD monitors.

Via LAN connection
The surveillance cameras are connected to a network or server (s) via LAN cable using this method. This works with a private network via the connection via DSL modemor with a corporate network by connecting through one or more servers. The advantage of this type of connection is that any device that has access to the network can also access the connected cameras. The private user can thus per tablet. PCor mobileon the Security Camera access. For most commercial, digital surveillance cameras, the matching APP for mobile phone, tablet and PC is included.

Via WLAN
Some of the commercially available surveillance cameras transmit their data via Wi-Fi. This means that the camera can be integrated into the domestic WLAN network or dialed as a stand-alone WLAN. Again, the access succeeds with WLAN-enabled mobile phones, tablets or PCs. However, this type of transmission is limited by the range. The wireless receiver that records the data should not be out of range of the wireless network. In commercial WLAN cameras, the range is usually 10 to 30 meters. However, this method poses a major security risk, as it is essential to assign a password to protect against unauthorized access and to change it regularly.

Via powerline connection
Instead of the LAN cable, the connection and data transfer between the camera and a network is via the power connector. This has the advantage that the transmission is less susceptible to interference.

Via Bluetooth
The connection and data transfer via Bluetooth is also offered for some surveillance models. However, only a small range of a few meters up to 10 meters is possible via Bluetooth. This means that the receiver should be in the immediate vicinity of the camera, which is not possible with large areas to be monitored.

Buy one Security Camera – What should be considered?
When buying a security camera, there is a lot to consider. First, the choice between analog and digital is important. Nowadays, purchasing an analog surveillance camera is no longer worthwhile. The transmitted audio and video signals are usually not of good quality and cheap digital alternatives with HD resolution have long been commercially available. Digital cameras transmit in HD and usually have a built-in night vision function, thanks to integrated LEDs. The types of transmission are varied and do not always indicate who is suitable for which digital camera. In general, the wired systems such as LAN, coaxial or powerline cable transmission are recommended. These methods are less susceptible to interference and unauthorized persons do not gain access as quickly. Furthermore, it is important to first determine the required number of surveillance cameras. Which corners are particularly favorable for a burglary, z. B. front door, patio / balcony door, cellar door, window areas and so on. When monitoring a company, it becomes even more complex. Therefore, a specialist should be consulted prior to purchasing surveillance in
struments.

Conclusion
The range of security cameras is huge. Digital cameras should be preferred due to large differences in quality, the analog cameras. In the transmission paths, ensure safe and interference-free audio and video signal transmission. For larger projects and monitoring areas, a specialist should be consulted. In general, very good surveillance cameras that are safe, interference-free, digital and broadcast in HD quality, to get a good price. A comparison of individual offers as well as the consultation with a specialist are always worthwhile.

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*Last update on 2020-11-04 / Affiliate links(we get a commission when you buy on amazon) / Images from Amazon Product Advertising API