DVR-järjestelmät

What is a DVR system?

The 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.

Mikä on digitaalinen videonauhuri?

Digitaalinen videonauhuri (DVR) eli digitaalinen videonauhuri käyttää kiintolevytallennusta verrattuna perinteiseen analogiseen videonauhuriin, joten sitä kutsutaan usein kiintolevytallentimeksi, joka tunnetaan myös nimellä DVR.

Se on tietokonejärjestelmä kuvien tallennukseen ja käsittelyyn. Siinä on pitkäaikainen videotallennus, tallennus, etävalvonta ja kuvan / äänen hallinta. DVR käyttää digitaalista tallennustekniikkaa ja on huomattavasti parempi kuin analogiset valvontalaitteet kuvankäsittelyn, kuvien tallennuksen, haun, varmuuskopioinnin, verkkolähetyksen ja kauko-ohjauksen osalta. DVR edustaa TV-seurantajärjestelmän kehityssuuntaa ja on markkinoiden suosituin TV-seurantajärjestelmän tuote.
Digitaalisessa videonauhurissa on oma sisäänrakennettu kiintolevyasema. Käyttäjät voivat aloittaa tallentamisen asettamatta mitään tallennusvälineitä. Kun kyseessä on analoginen kameratallennus, digitaalinen videotallennus tukee toimintoja, kuten etäkäyttöä, liiketunnistusta, reaaliaikaista toistoa, tallennusta ja varmuuskopiointia. Kotiviihdettä varten televisiosignaalit syötetään suoraan digitaaliseen videonauhuriin ja muunnetaan sitten digitaaliseen muotoon MPEG-2-kooderin avulla. Sieltä se siirretään kahteen eri kohteeseen, joista toinen tallennetaan kiintolevylle ja toinen näytetään televisioruudulla katselua varten. Digitaalisen videonauhurin uudemmassa versiossa voidaan tallentaa eri kanavien eri videoita samanaikaisesti.
Digitaalisella videonauhurilla on monia ilmeisiä etuja verrattuna muihin videotallennusmenetelmiin. Muihin vastaaviin laitteisiin verrattuna digitaalinen videonauhurijärjestelmä on helppo asentaa ja käyttää. Ne vaativat myös vähemmän tallennustilaa ja voivat tarjota korkeamman kuvanlaadun. Digitaalisella videonauhurilla on myös nopeampi tiedonhakunopeus ja kohinanestokyky.
Verrattuna videonhallintaohjelmistoon tai verkkovideonauhuriin, verrattuna muihin järjestelmiin, digitaalinen videonauhuri ei kuitenkaan pysty tukemaan useita kameroita yhdessä järjestelmässä eikä se voi käsitellä niin monta kuvaa sekunnissa. Niillä ei ole uudempien järjestelmien, kuten videonhallintaohjelmiston ja verkkovideonauhurin, reunalaitteiden käsittelykyvyn etuja.

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.

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