Sistemi DVR

What is a DVR system?

Il DVR system allows you to record the security video captured by your CCTV camera and watch it again when you need it. This is critical to site security. In case of security threat or criminal attack, DVR system will ensure that you have security video as evidence, and it can also let you identify the attacker. In fact, businesses of all sizes should develop the habit of backing up their data regularly to protect you in the event of physical damage or theft.

Currently available DVR systems can often record videos of up to 16 CCTV security cameras at the same time, which is called “multi-channel recording”. DVR also tends to be equipped with a hard drive to enable you to store and back up recorded movies. In addition, more advanced DVR products will support cloud storage and even include some applications to help you monitor real-time streams when you leave the website.

Che cos'è un videoregistratore digitale?

Il videoregistratore digitale (DVR), ovvero il videoregistratore digitale, utilizza la registrazione su disco rigido rispetto al tradizionale videoregistratore analogico, per cui viene spesso chiamato hard disk recorder, noto anche come DVR.

È un sistema informatico per l'archiviazione e l'elaborazione delle immagini. Ha le funzioni di videoregistrazione a lungo termine, registrazione, monitoraggio remoto e controllo di immagini/voce. Il DVR adotta la tecnologia di registrazione digitale ed è di gran lunga superiore alle apparecchiature di monitoraggio analogiche per quanto riguarda l'elaborazione delle immagini, l'archiviazione delle immagini, il recupero, il backup, la trasmissione in rete e il controllo remoto. Il DVR rappresenta la direzione di sviluppo del sistema di monitoraggio TV ed è il prodotto preferito del sistema di monitoraggio TV sul mercato.
Il videoregistratore digitale è dotato di un disco rigido incorporato. Gli utenti possono avviare la registrazione senza inserire alcun tipo di supporto di memorizzazione. Se si tratta di una telecamera analogica, la registrazione video digitale supporta funzioni come l'accesso remoto, il rilevamento del movimento, la riproduzione in tempo reale, la registrazione e il backup. Per l'intrattenimento domestico, i segnali televisivi entrano direttamente nel videoregistratore digitale, per poi essere convertiti in formato digitale con l'aiuto del codificatore MPEG-2. Da qui, vengono trasmessi a due canali di trasmissione. Da qui, vengono trasmessi a due diversi obiettivi: uno al disco rigido per l'archiviazione e l'altro allo schermo del televisore per la visione. Le versioni più recenti dei videoregistratori digitali possono registrare contemporaneamente diversi video da canali diversi.
Rispetto ad altri metodi di registrazione video, il videoregistratore digitale presenta molti vantaggi evidenti. Rispetto ad altri dispositivi simili, il sistema di videoregistrazione digitale è facile da configurare e utilizzare. Inoltre, richiede meno spazio di archiviazione e può fornire una qualità d'immagine superiore. Il videoregistratore digitale ha anche una maggiore velocità di recupero dei dati e una capacità antirumore.
Tuttavia, rispetto al software di gestione video o al videoregistratore di rete, il videoregistratore digitale non è in grado di supportare più telecamere su un unico sistema e non può elaborare così tanti fotogrammi al secondo. Non hanno i vantaggi della capacità di elaborazione dei dispositivi periferici dei sistemi più recenti, come il software di gestione video e il videoregistratore di rete.

What is the difference between DVR and NVR?

DVR stands for digital video recorder, NVR stands for digital video recorder and network hard disk video recorder. NVR uses advanced IP camera. With the help of Internet connection, they have the ability to record and store video clips by themselves. On the other hand, the DVR system uses an analog camera. These cameras themselves cannot store and record CCTV images. They transmit the unprocessed video stream to the DVR through coaxial cable, and then the DVR processes the video.
The digital video recorder encodes and stores video signals, while the NVR stores video encoded by the camera. “

What are the resolution characteristics of the DVR system?

When evaluating the resolution characteristics of the DVR system, one thing to remember is the ‘frames per second’ metric, because this will help ensure that the safety video you record is of high enough quality.
Frames per second is essentially the number of still images recorded by the DVR per second. The photos eventually pieced together into a video. Although this sounds a little outdated, it’s how video lenses work – even in the Hollywood world. An American radio movie is shot at 30 frames per second. That is to say, the movie every second includes 30 still images, which are continuously connected together to form a flow.
The larger the number of FPS, the better the image quality. Because DVR is responsible for recording your video clips, you need to make sure to select the appropriate FPS. Usually, DVR allows you to determine the FPS you need so that you can try and test your requirements on your website. Just make sure you can accurately recognize the changes of face, details and high-risk areas.
It is not uncommon for DVR marketing materials to mention 400 frames per second. Although this sounds shocking – especially compared with the quality of 30 frames per second of Hollywood blockbusters – it only means that the DVR can hold 400 frames per second, this number will be divided according to the number of CCTV cameras you have on the website. Therefore, if you have a CCTV system consisting of 20 security cameras, the frame rate of each camera will reach 20 (400 FPS divided by 20 security cameras).

What should I pay attention to when selecting a DVR system?

Before purchasing a DVR system, you should find out the following questions:

• How high is FPS?
• How much area do you need to cover?
• How high resolution and image definition do you need?
• Do you need to add more CCTV cameras to your website? If so, this may reduce the FPS potential of DVR.
• What is the view of your security camera? What is the focal length of the lens? This may affect the image quality of distant parts of the object or site, resulting in inconsistent resolutions of different lenses. For example, an ultra wide (180 degree) lens is great for overall safety monitoring, but due to the angle of the fish tank, it is likely to distort the effect of face recognition and make the lens unusable.
• Is audio important?
• What are the lighting conditions, weather conditions and obstacles that affect the quality of cloud images?

It’s also worth seeing the video management system install CCTV security camera and DVR, because the average time people pay attention to the video lens is 20 minutes: “VMS or built-in analysis can remind you of suspicious activities and apply analysis, so as to improve your business operation.” if you are considering installing a camera with built-in analysis function:

• Don’t just rely on the sales manual – talk to the manufacturer;
• You should know that VMS is integrated with DVR manufacturers only because of “the graphics workload involved in importing the user interface”;
• Find out if it’s user friendly;
• Find independently tested software.

Cina DVR system manufacturer www.tractility.com offers Digital video recorder (DVR).