Network recorders (NVR) are used to decode, display and store the video streams of the IP cameras present in the network.
Advanced coding methods, such as the H.265+ codec developed by Dahua Technology, allow the bandwidth of incoming data streams to be reduced by a large amount.
Compared to HDCVI DVR recorders, network cameras do not need to be connected to the recorder by cable. If the cameras are on the same network, the recorder can display them on the user interface and you can easily select which cameras you want to integrate into your recorder.
Network video recorders with integrated PoE ports can, in addition to transmitting video, audio and control signals, also supply the network cameras with power via the network connection. This saves you time and material - especially when it comes to cabling.
The Dahua Ultra, Pro and Lite series network recorders are tailored to different use cases. The Ultra series recorders offer the best performance and the highest quality. The Pro series are perfect for medium-sized projects that need to balance performance and budget. Lite series recorders are designed for the best price-performance ratio and adhere to Dahua's strict quality standards. Dahua network recorders are equipped with different video channel capacities and components to suit different application scenarios.
The Ultra, Pro and Lite recorders can only analyse events captured by a network camera with AI function! To be able to use AI functions such as "counting people" or improved motion detection (SMD), you always need a camera that also offers the respective AI function.
All three series support the evaluation of the following AI functions:
- IVS, perimeter protection, tripwire, area intrusion, object added/removed,...
- Improved motion detection (SMD) with human/vehicle filter
- Person count
- Area frequency graph (heat map)
The Pro and Ultra series also offer you the possibility to rectify the image of a fisheye camera.
The WizSense network recorder from Dahua Technology offers the user AI functions for integrated IP cameras. The recorder uses advanced deep-learning algorithms, with a focus on reliable detection of people and vehicles. This enables the user to react quickly to defined scenarios.
The following AI functions are supported by the recorder for IP cameras. The number of channels supported depends on the recorder type.
- Perimeter protection or
- Face detection / face comparison or
The WizMind network recorder from Dahua Technology provides the user with AI functions for connected IP cameras. The recorder uses advanced deep learning algorithms, with a focus on the reliable recognition of people and vehicles. This enables the user to react quickly to defined scenarios.
The following AI functions are supported by the recorder for IP cameras. The number of supported channels depends on the recorder type (only one rule per selection is possible):
- Perimeter protection or
- Face detection / face identification or
- Video metadata
In addition, the WizMind recorders support the evaluation of the following AI functions in combination with a camera that also supports these features:
- Number plate recognition
- People counting
- Heatmap (area frequency map)
- Body temperature measurement
Perimeter protection is an AI feature that allows you to draw a tripwire or an area on the live image of your camera. By selecting the "Human" and "Vehicle" filters, you can have an alarm triggered when the tripwire is crossed or when an object (human or vehicle) defined in the filter enters the defined area.
Recorders with face detection capability allow faces to be captured and stored in a database. For the stored face, the following attributes are estimated and stored: Age, gender, facial expression, glasses, mask and beard.
If the recorder supports the "face comparison" function, the recorder compares the photo with a previously created database after a face has been detected. If there is a match between a detected face and a face from the database, the recorder triggers an alarm. This function is often used to monitor house bans.
Smart recorders can capture metadata (called attributes) for a limited number of channels, even for images from cameras without AI functions. This includes information on gender, clothing, licence plate number, vehicle type and more.
In order to equalise the very high angle of view of a fisheye camera, recorders with the fisheye equalisation function offer you the option of displaying the camera image as a stretched panorama image, or as several individual images.
Dahua recorders are available in black and white.
Using the audio input of your recorder, you can connect a microphone to communicate via the speakers of the connected cameras.
You can connect various playback devices such as headphones or loudspeakers to the audio output of the recorder to play back the sound of the live image and the camera recordings.
The number of video inputs on the recorder indicates how many network cameras can be integrated in the user interface of the recorder. Therefore, when purchasing, pay attention to how many cameras you want to operate. Network cameras do not necessarily have to be connected directly to the recorder. However, the cameras and the network recorder must be in the same network.
The Ethernet connection, also called network connection, allows you to connect your HDCVI recorder to your network. In this way, network cameras can also be integrated into the recorder. The network connection also allows remote access to your recorder.
You can connect your recorder to screens or televisions via the HDMI (High-definition Multimedia Interface) connection. The HDMI multimedia interface also allows the transmission of an audio signal. In our shop you will find a variety of monitors that have been specially designed for use around the clock.
The VGA (Video Graphics Array) connector allows you to connect the recorder to monitors, compatible TVs or projectors. Please note that the VGA connector only transmits an analogue video signal.
Depending on your needs, Dahua Technology recorders offer up to 8 slots for hard drives. This allows you to store even large amounts of video material over a long period of time. You can quickly find out which size your selected recorder supports in the product description. At Controlex, we recommend the Purple series of hard drives from Western Digital. The WD Purple hard drives are specially designed for 24/7 use in the field of video surveillance. Normal hard drives are not suitable for the demanding requirements of continuous recording of multiple high-resolution videos and therefore wear out very quickly. In our shop you will find a large selection of hard drives that have been specially designed for use in video surveillance.
Via the alarm input of your recorder, you can trigger a variety of functions when an alarm is received. For example, you can arm IVS rules or start recordings on several channels at the same time. With the help of the Alarm Box, you can expand the number of your alarm inputs/outputs.Alarm Output
The alarm output of the recorder is used to transmit an alarm signal. The signal can be used to activate warning lights, sirens, cameras or other devices.
The incoming signals from the cameras at the recorder are to be understood as a data flow. This data flow, also known as a "bitstream", varies in size depending on the resolution and the amount of information being transmitted. To ensure that your recorder can reliably record a larger number of high-resolution cameras, be sure to pay attention to the maximum bandwidth (specified in megabits per second) when selecting a recorder.
Power-over-Ethernet is a technology that enables the simultaneous transmission and reception of data as well as the power supply via one cable. The PoE ports on the recorder allow you to supply your network cameras without a power cable. The power supply to the devices is provided via the network cable.
Wi-Fi enabled recorders allow the direct integration of Wi-Fi cameras into the recorder.