DVR knowledge
2024-10-12 20:00:42
One. What is a hard disk recorder
A Digital Video Recorder (DVR), or a digital video recorder, is a hard disk video recorder compared to a conventional analog video recorder and is often referred to as a DVR. It is a computer system for image storage processing. It has the functions of long-term recording, recording, remote monitoring and control of images/voices. DVR integrates video recorders, picture splitters, pan/tilt lens control, alarm control, and network transmission. With five functions in one, one device can replace the functions of a large number of devices in an analog surveillance system, and it will gradually gain an advantage in terms of price. DVR adopts digital recording technology and is far superior to analog monitoring equipment in image processing, image storage, retrieval, backup, network transmission, and remote control. DVR represents the development direction of TV monitoring system and is currently on the market. The preferred product for television monitoring systems.
Currently, the mainstream DVRs in the market use compression technologies such as MPEG-2, MPEG-4, H.264, and M-JPEG, while MPEG-4 and H.264 are the most common compression methods in China; they are divided from the compression card. Compression and hard compression are two types. Soft pressure is greatly affected by the CPU. Most of them cannot be displayed and recorded in real time. Therefore, they are gradually compressed and eliminated. The number of camera input channels is divided into 1, 2, and 4 channels. 6-way, 9-way, 12-way, 16-way, 32-way, or even more; in general, according to the system structure can be divided into two categories: PC-based PC-based DVR and off-PC architecture embedded DVR. Here we mainly talk about PC DVR and embedded DVR.
PC type DVR: This kind of framework DVR takes the traditional PC as the basic hardware, takes Win98, Win2000, WinXP, Vista, Linux as the basic software, equipped with the image acquisition or the image acquisition compression card, compiles the software to become a complete system. The PC is a universal platform. The PC's hardware replacement speed is fast. Therefore, the PC-based DVR's product performance is easier to upgrade, and software corrections and upgrades are also more convenient. The realization of various functions of PCDVR depends on various kinds of boards, such as video and audio compression cards, network cards, sound cards, and graphics cards. This type of card-based system is prone to unreliable problems in system assembly, maintenance and transportation. It can not be used in the field of industrial control. It is only suitable for commercial office environments where the reliability is not high.
Embedded DVR: Embedded systems generally refer to non-PC systems, devices or devices that have computer functions but are not referred to as computers. It is a micro-dedicated computer system with application-centric, hardware-software-reduced, and strict requirements on functions, reliability, cost, volume, and power consumption. Simply put, the application software and hardware of the embedded system integration system are integrated, which is similar to the working mode of the BIOS in the PC. It has the characteristics of small software code, high automation, and fast response, and is particularly suitable for real-time and multi-task requirements. application. Embedded DVR is an embedded system based on embedded processor and embedded real-time operating system. It uses a dedicated chip to compress and decompress images. The embedded operating system mainly completes the control and management of the whole machine. Such products do not have so many modules and redundant software functions of PCDVR. They have targeted the stability of software and hardware during design and manufacturing. Therefore, such products are of stable quality and will not cause problems due to crashes. The storage speed, resolution, and picture quality of the video and audio compression stream have greatly improved, and in terms of functionality, it is no worse than the PCDVR. The embedded DVR system is built on the integrated hardware structure. The entire video and audio compression, display, and network functions can all be implemented by a single board, which greatly improves the reliability and stability of the entire system hardware.
II. The main functions of the hard disk recorder
1. Surveillance: Surveillance function is one of the most important functions of hard disk video recorders. Whether it can monitor the camera's screen in real time and clearly is a core problem of surveillance systems. Most hard disk recorders can do real-time and clear monitoring at present. .
2. Video: The video effect is the core and vitality of the digital host. The real-time and clear images are seen on the monitor. The playback effect recorded is not necessarily good. The most important effect of the forensics is to watch the video effect. Under normal circumstances, Video effects are more important than monitoring effects. Most DVR videos can be recorded in real-time at 25 frames per second. Some video recorders have a total of less than 5 frames per second. Usually, the resolution is CIF or 4CIF. One camera recording takes about 180 MB to 1 GB for 1 hour. hard disk space.
3. Alarm function: mainly refers to the detector input alarm and image video frame alarm, after the alarm system will automatically open the recording function, and through the alarm output function to turn on the corresponding spotlight, alarm and network output signal. Image motion detection is the main alarm function of the DVR.
4. Control function: mainly refers to the control of the camera through the host for the full range of camera heads and lenses, which is generally accomplished through a dedicated decoder and keyboard.
5. Network function: Through simple identification of the local area network or wide area network, the host can perform various monitoring and recording control operations, which is equivalent to the local operation.
6. Password authorization function: In order to reduce system failure rate and illegal entry, passwords are required to stop recording, arming and disarming the system and entering programming, so that unauthorized persons are not allowed to operate. Generally, they are divided into multi-level password authorization systems.
7.Work schedule: It is possible to program the working time of a certain camera during a certain period of time. This is also a unique function of the digital host. It can pre-arrange the changes of holidays and work schedules into the program. In the sense of achieving unattended.
A Digital Video Recorder (DVR), or a digital video recorder, is a hard disk video recorder compared to a conventional analog video recorder and is often referred to as a DVR. It is a computer system for image storage processing. It has the functions of long-term recording, recording, remote monitoring and control of images/voices. DVR integrates video recorders, picture splitters, pan/tilt lens control, alarm control, and network transmission. With five functions in one, one device can replace the functions of a large number of devices in an analog surveillance system, and it will gradually gain an advantage in terms of price. DVR adopts digital recording technology and is far superior to analog monitoring equipment in image processing, image storage, retrieval, backup, network transmission, and remote control. DVR represents the development direction of TV monitoring system and is currently on the market. The preferred product for television monitoring systems.
Currently, the mainstream DVRs in the market use compression technologies such as MPEG-2, MPEG-4, H.264, and M-JPEG, while MPEG-4 and H.264 are the most common compression methods in China; they are divided from the compression card. Compression and hard compression are two types. Soft pressure is greatly affected by the CPU. Most of them cannot be displayed and recorded in real time. Therefore, they are gradually compressed and eliminated. The number of camera input channels is divided into 1, 2, and 4 channels. 6-way, 9-way, 12-way, 16-way, 32-way, or even more; in general, according to the system structure can be divided into two categories: PC-based PC-based DVR and off-PC architecture embedded DVR. Here we mainly talk about PC DVR and embedded DVR.
PC type DVR: This kind of framework DVR takes the traditional PC as the basic hardware, takes Win98, Win2000, WinXP, Vista, Linux as the basic software, equipped with the image acquisition or the image acquisition compression card, compiles the software to become a complete system. The PC is a universal platform. The PC's hardware replacement speed is fast. Therefore, the PC-based DVR's product performance is easier to upgrade, and software corrections and upgrades are also more convenient. The realization of various functions of PCDVR depends on various kinds of boards, such as video and audio compression cards, network cards, sound cards, and graphics cards. This type of card-based system is prone to unreliable problems in system assembly, maintenance and transportation. It can not be used in the field of industrial control. It is only suitable for commercial office environments where the reliability is not high.
Embedded DVR: Embedded systems generally refer to non-PC systems, devices or devices that have computer functions but are not referred to as computers. It is a micro-dedicated computer system with application-centric, hardware-software-reduced, and strict requirements on functions, reliability, cost, volume, and power consumption. Simply put, the application software and hardware of the embedded system integration system are integrated, which is similar to the working mode of the BIOS in the PC. It has the characteristics of small software code, high automation, and fast response, and is particularly suitable for real-time and multi-task requirements. application. Embedded DVR is an embedded system based on embedded processor and embedded real-time operating system. It uses a dedicated chip to compress and decompress images. The embedded operating system mainly completes the control and management of the whole machine. Such products do not have so many modules and redundant software functions of PCDVR. They have targeted the stability of software and hardware during design and manufacturing. Therefore, such products are of stable quality and will not cause problems due to crashes. The storage speed, resolution, and picture quality of the video and audio compression stream have greatly improved, and in terms of functionality, it is no worse than the PCDVR. The embedded DVR system is built on the integrated hardware structure. The entire video and audio compression, display, and network functions can all be implemented by a single board, which greatly improves the reliability and stability of the entire system hardware.
II. The main functions of the hard disk recorder
1. Surveillance: Surveillance function is one of the most important functions of hard disk video recorders. Whether it can monitor the camera's screen in real time and clearly is a core problem of surveillance systems. Most hard disk recorders can do real-time and clear monitoring at present. .
2. Video: The video effect is the core and vitality of the digital host. The real-time and clear images are seen on the monitor. The playback effect recorded is not necessarily good. The most important effect of the forensics is to watch the video effect. Under normal circumstances, Video effects are more important than monitoring effects. Most DVR videos can be recorded in real-time at 25 frames per second. Some video recorders have a total of less than 5 frames per second. Usually, the resolution is CIF or 4CIF. One camera recording takes about 180 MB to 1 GB for 1 hour. hard disk space.
3. Alarm function: mainly refers to the detector input alarm and image video frame alarm, after the alarm system will automatically open the recording function, and through the alarm output function to turn on the corresponding spotlight, alarm and network output signal. Image motion detection is the main alarm function of the DVR.
4. Control function: mainly refers to the control of the camera through the host for the full range of camera heads and lenses, which is generally accomplished through a dedicated decoder and keyboard.
5. Network function: Through simple identification of the local area network or wide area network, the host can perform various monitoring and recording control operations, which is equivalent to the local operation.
6. Password authorization function: In order to reduce system failure rate and illegal entry, passwords are required to stop recording, arming and disarming the system and entering programming, so that unauthorized persons are not allowed to operate. Generally, they are divided into multi-level password authorization systems.
7.Work schedule: It is possible to program the working time of a certain camera during a certain period of time. This is also a unique function of the digital host. It can pre-arrange the changes of holidays and work schedules into the program. In the sense of achieving unattended.
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