DIPOL Weekly Review – TV and SAT TV, CCTV, WLAN

The fastest camera in the world.

In an article published in the Nature Communications journal, scientists from the California Institute of Technology presented a new imaging technique that can capture videos at a shocking 70 trillion (70x10¹²) frames per second. In earlier works on imaging techniques based on silicon sensors, the rates of up to millions of frames per second were achieved. It is not enough, however, to capture and document the most volatile physical phenomena such as nuclear fusion or fluorescent radioactive decay. Scientists usually investigate these ultrafast effects by triggering them multiple times and repeatedly observing them in different time intervals. Such approach reduces considerably the possibility of registering and observing some phenomena.

Diagram of the CUSP system
(source: http://www.nature.com)

The Lihong Wang technique, developed by the professor of medical and electrical engineering sciences at Caltech, is known as the Compressed Ultra-Fast Spectral Photography (CUSP). It utilizes short laser light pulses lasting one femtosecond (0.000.000.000.000001 seconds). The entire system is split into two parts: the imaging and lighting sections. In the imaging section, an interchangeable system of lenses records the scene while splitting the light beam into two paths. At the end of one of them, there is a camera recording the non-diffused light. In the second path, there is a DMD (digital micromirror device) module for encoding the recorded image into a pseudo-random binary stream which, in the form of light, is then transmitted to the streak camera. Such cameras record changes in light intensity vs. time (they are used, among others, in autonomous vehicles as part of the LIDAR system). The lighting (illumination) section generates and directs ultra-short laser pulses to the scene being recorded. The system generates 70 trillion pulses per second, which translates into the same number of fps of the recorded footage.

TRISET B2CA - halogen-free coaxial cable.

From July 1, 2017 in the EU, all installation cables in buildings are considered to be construction products subject to applicable regulations. The CPR Directive requires manufacturers to develop and make available the Declaration of Performance (DoP), as well as to mark products covered by the relevant CE mark. The EN50575 specifies the requirements for: performance in fire conditions, test and evaluation methods for power, control and telecommunications cables used in buildings with a specific fire resistance class. With the introduction of the common European reaction to fire classes, designers and architects have at hand clear regulations regarding the use of the appropriate types of cables. To achieve increased fire safety levels, cable manufacturers recommend the use of B2CA cables in special-purpose buildings that must meet very tight safety requirements (e.g. in hospitals, nurseries, high-rise buildings, office buildings and nursing homes).

A new type of coaxial cable, TRISET B2CA E1020_500 suitable for MATV/SMATV antenna systems in public buildings is now available in DIPOL offer. The cable has a LSOH sheath (halogen-free insulation). In the event of a fire, the cable does not spread flame, smoke emission is very low and the released gases are not corrosive.

Key features:

• complies with A++ class requirements
• reaction to fire class acc. to CPR - B2ca-s1a,d1,a1
• 1.05 mm copper core
• low loss
• high screening efficiency
• 82% braid coverage
• 5-year warranty
• LSOH cable

Optical video converters – PTZ control.

All models of video converters Ultimode support RS485 data transmission, e.g. control signals to PTZ cameras. The transmission does not require any additional configuration, it is only important to properly connect the wiring and employ typical ready-to-use resources of CCTV systems implemented in PTZ cameras, DVRs, keyboards or other control devices.

The concept of ​​using optical video converters.
Transmission of video signal from the camera to the DVR and PTZ camera control.

The requirements for the communication between a control unit or DVR and a PTZ camera:

If the external keyboard is not used to control PTZ, only the DVR (controlled as part of the HD-TVI protocol), the RS-485 port of the DVR should be connected to the receiver of the video converter set. With no such connection, it will not be possible to control the camera, since the control signals in the coaxial cable (HD-TVI) are not transmitted by optical fiber (only video signal is transmitted).

Support for 8 MP cameras in HUHI series DVRs.

Cameras with a resolution of up to 8 MP are available in the TurboHD system. Such a high resolution is ideal for monitoring wide scenes, ensuring the right image quality expressed as pixel density, i.e. the number of pixels per meter of the height of the observed frame or object. With 4K resolution, it is possible to record four times more details than with cameras having the 2 MP (1080p) sensors, and thus a more useful image is obtained.

HTHI series and selected models of the HUHI series DVRs are dedicated to 8 MP cameras (with some functional restrictions), which are listed in the table below.

Dedicated controller for the Omada TP-Link system.

The OC200 N2560 controller has been designed to centrally manage a whole network of EAP series devices. Features including as real-time monitoring of traffic statistics and their analysis through built-in data visualization tools, guest authentication via the captive portal, system upgrading and restarting, and easy network scaling - will help manage the WiFi network.

EAP TP-Link Omada Cloud Controller OC200 N2560

Key features:

With the controller, the network administrator can set the authentication of wireless clients through a captive portal. This method requires the user to perform appropriate actions (such as approving conditions of use or logging in to the system) in order to gain access to the network. These activities are then verified by the appropriate server or database prepared by the administrator.

Documenting construction progress using the Hikvision IP camera.

Hikvision IP cameras can sequentially take and record pictures, as well as they can perform such operations in response to some events. In the sequence mode, one can create e.g. the history of the progress of construction of a building. This solution saves the user a plenty of disk space (memory card/server), while ensuring that the construction process is well documented. The ideal cameras for this purpose are those with microSD interface (F or G0 and G1 symbols in the camera name). The time interval can range from 1 s to 7 days. Additionally, the schedule can be configured in such a way as to take the pictures during working hours i.e. at certain times of the days of the week, when the construction crew is on the spot, for example from Monday to Friday, from 8:00 - 16:00, e.g. with 1-hour interval (see below).

Hikvision cameras supporting this function:

What is the maximum range of TurboHD signal transmission? In TurboHD system, the video signal and power supply can be transmitted using coaxial cables or twisted pair cables. The transmission range depends on the cable type, required resolution and smoothness of the video. Exceeding a certain minimum results in a significant reduction in the image quality: loss of detail and blurring, and in the case of even longer distances, loss of synchronization and the image disappearance...>>>more

For the M75051 TurboHD 4.0 camera with the RG-59 cable, the range is 700 meters

People counting camera