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En el mercado hay una gran variedad de tarjetas microSD para la captura de vídeo en edge de la red. Dado el papel que desempeñan en un entorno de videovigilancia es fundamental elegir la más adecuada. Ziv peace, de Western Digital, explica en esta tribuna cuales son los elementos que hay que tener en cuenta.

Camara videovigilancia

With the increased demands of safety and security at the global level, coupled with the support of the advances in IP cameras and camera technology 360 degrees, the video surveillance industry is growing. The market research made indicates expected that this global industry will reach a 39,3 billions of dollars in revenue in 2023, driven by a CAGR (Annual compound growth rate) of 9,3% of 2018 to 2023.

Video surveillance is not only to capture images (to monitor an event or incident when it occurs), but that also analyzes the data offering, providing actionable information that can improve operational efficiency, better understand customers purchase behavior or simply provide added value and intelligence to businesses.

To ensure that the quality of the data is good enough to extract the details needed to take advantage of the information provided, surveillance cameras have also evolved technologically, no solo con las capacidades ampliadas que rodean el zoom óptico y el rango de movimiento, sino también con mejoras del ratio señalruido (S2N), sensibilidad a la luz (and the minimum illumination required to get usable images), wide dynamic ranges (WDR) to change foreground and background lighting requirements, and of course, resolutions of higher quality.

Camara videovigilancia

Therefore expected that 4K Ultra HD-compatible network cameras will grow from the 0,4% in 2017 to the 28% in 2021, which represents a staggering growth of the 170% annual and it will require three to six times the storage space of video 1080 p depending on used compression technology.

Surveillance cameras are usually connected to a network video recorder (NVR), acting as a gateway or a local server, collecting data from cameras and running video management software (VMS), as well as the analysis of the data. The capture of this information depends on the route of communication between individual cameras and the NVR. If this connection is lost, whether intentional or not intentional, or due to a malfunction, video is not captured and the system ceases to perform its operations.

For this reason, has become common use of microSD cards in surveillance cameras as a fail-safe mechanism. Despite the loss of connectivity to the NVR, the camera can record and capture images in raw locally until restore network, that in itself could take much time depending on the personnel for maintenance and the availability of the equipment, weather conditions or other unforeseen. Dado que las tarjetas microSD desempeñan un papel fundamental como mecanismo de seguridad para garantizar la disponibilidad del servicio, es importante elegir la tarjeta más adecuada para la captura de secuencias de vídeo.

Camara videovigilancia

Características clave a tener en cuenta

Hay muchas tarjetas microSD diferentes entre las que elegir para la captura de vídeo en edge de la red, ya que van desde capacidades de nivel industrial hasta nivel comercial o minorista, y todas las que se encuentran en el medio. Para ayudar a despejar algunas de estas dudas, estas son las características clave que una tarjeta microSD debe tener para la captura en videocámaras.

  • Diseñada para vigilancia:

A medida que el mercado experimenta un crecimiento constante, los proveedores de almacenamiento quieren participar de este crecimiento y lo han hecho con una serie de tarjetas microSD readaptadas, reempaquetadas y reorientadas para la videovigilancia, pero sin mucha fiabilidad, rendimiento o capacidades específicas para este uso.

To add the absence of specifications of mean time between errors (MTBF) to the equation, the reliability of the microSD card is usually a perceived measurement (measured in hours of operation) how relatively vague and hidden under metrics associated with the resolution of the camera and the compression ratio. Thus, When you select a microSD card for surveillance cameras in edge, the choice must include a provider that is reliable, have experience and a guaranteed portfolio of video surveillance storage on microSD card technologies.

  • High resistance:

Resistance, in what refers to the microSD card, represents the number of rewrites (program/Erase cycles) What are possible until the card already not can store data correctly. The writeback operation is cyclical so a new recording sequence replaces the previous content to write about it until the card is filled, and the cycle repeats.

The greater the resistance, the greater the performance of the card until it should be replaced. Resistance is also measured in terabytes written (TBW) or the number of hours that the card can record continuously (While the data is overwritten) until an error occurs.

  • Condition monitoring:

Condition monitoring is a desirable capability that currently not many microSD card support, and which allows the host system to check if a card resistance levels are low and must be replaced. Have a card that supports this capability enables system integrators and operators have the ability to perform preventative maintenance that will help reduce system errors, as well as the associated maintenance costs.

  • Performance:

To capture continuous recording raw workflows, Cards microSD into surveillance cameras perform write operations between the 70/90% weather, while reading the captured footage is done between the 10/30%.

La diferencia en el rendimiento de lectura/escritura depende de si la tarjeta se utiliza en una cámara con inteligencia artificial (IA) o una estándar. Encontrar una tarjeta que sea apta para escritura y pueda proporcionar suficiente ancho de banda para capturar adecuadamente los datos transmitidos y sea rentable, requiere que se encuentre entre las capacidades de tarjetas industriales rápidas y las comerciales más lentas.

Un ancho de banda en el rango de 50 MB/sg para escrituras y 80 MB/sec for reading is the usual and sufficient microSD card used within surveillance cameras.

  • Temperature ranges:

Since microSD cards must be designed for continuous operation in extreme weather conditions and great a variety of climates, whether they are inside or outside, It is compatible with various temperature ranges is another feature to keep in mind.

Given the broad spectrum of temperatures required by the camera manufacturers, the microSD card implemented within the surveillance cameras should withstand temperature ranges from - 25 degrees Celsius to 85 degrees Celsius, or in extreme cases, even up to - 40 ° Celsius.

  • Capacity:

It is also important to select the right capacity, Since you must have a minimum level to ensure that there is enough space to store the material for several days or weeks before they are overwritten or restore connectivity to the NVR.

Although 64 GB se consideran la capacidad óptima para las tarjetas microSD instaladas en las cámaras de vigilancia actuales, la capacidad de 32 GB puede ser apta en instalaciones de videovigilancia más modestas o de nivel más básico. In the future, serán importantes incluso mayores capacidades para casos de uso específicos y se convertirán en capacidades estándar a medida que el mercado evolucione.

Al elegir la tarjeta microSD de almacenamiento adecuada para implementar en su sistema de videovigilancia, hay que asegurarse que esté diseñada específicamente para esta aplicación: que incluye los niveles adecuados de resistencia y rendimiento para capturar flujos continuos, puede soportar desafíos ambientales y un rango amplio de temperatura y permite mantenimiento preventivo para proporcionar años de servicio.

Es fundamental que el sistema de vigilancia pueda recopilar secuencias de vídeo tanto si la cámara está conectada a un NVR como si se trata de una cámara independiente, Since the collection of images on the basis of the surveillance system is the most crucial error. Thus, fail-safe mechanisms are required to maintain the camera recording until restore network.

Ziv peace, Western DigitalZiv peace

Director of Product Marketing, Embedded and integrated solutions of Western Digital
 
 
 
 

 

 

 


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By • 20 Sep, 2018
• Section: Computer Security, Tribunes, CCTV