DVR (Digital DVR) is a second-generation monitoring system that has developed rapidly after more than a decade of analog video recording systems. The initial DVR uses a microcomputer and Windows platform, and installs a video compression card and corresponding DVR software in the computer. Different types of video cards can connect 1/2/4 channels of video, support real-time video and audio, and are the first generation of analog monitoring system upgrades. A digital solution, also known as a soft compression scheme.
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Characteristics of DVR system: The collection and storage of video and audio signals are mainly in digital form with high quality; the system functions are powerful and perfect; the information system can exchange data; the application flexibility is better. According to the structure of the hard disk recorder, it can be divided into a PC type hard disk recorder and an embedded hard disk recorder.
PC-type hard disk recorder: The early DVR was developed on the basis of PC. It is based on the video capture card, using software to achieve compression and storage, taking up a lot of system resources, with the introduction of video compression standards and With the development of dedicated chips, the structure of PC-type digital hard disk recorders has evolved into the structure of image compression cards + commercial computers, also known as hard compression.
Tag: DVR embedded
Embedded DVRs generally refer to non-PC systems that write internal operating systems and applications onto dedicated chips to become video surveillance devices for a specific application. The embedded digital hard disk recorder adopts integrated design and integrates functions such as video capture, video compression, video storage, pan/tilt lens control and remote transmission to ensure the stability and reliability of the system. With the advancement and use of technology The need for a network-type embedded digital hard disk recorder with multiple network interfaces, using TCP/IP protocol to realize remote transmission of LAN and WAN.
The digital video recorder (DVR: DigitalVideoRecorder) was originally used in the security monitoring field such as finance and transportation. The image capture device such as the camera saves the required monitoring content in a specific format on the hard disk, so that any content can be selected for playback at any time. Since the storage medium is based on a hard disk rather than a conventional tape, we simply call it a "DVR." By configuration, digital DVR can easily realize data format conversion, encrypted storage, remote control, rate control and multi-channel simultaneous recording and playback. These are based on the characteristics of new technologies in the electronics and communication industry in recent years. It replaces traditional video recording methods based on traditional tape media. These new features, especially their high reliability and reusability, are equally tempting for the TV broadcast industry.
Future DVR development trend
1. clarity
Sharpness has always been a key indicator for customers to choose products. Image quality is a core issue in evaluating the quality of digital video recorders. With the development of high-definition technology and the popularity of high-definition cameras, HD DVR will be the research and development target of the next generation of DVR manufacturers.
2. More efficient compression algorithm
In order to meet the needs of high-definition storage, improve image storage time, and reduce the bandwidth occupied during transmission, DVR vendors are developing more efficient compression algorithms. The currently widely used compression algorithm is simplified H.264.
3. Centralized storage
With the advancement of digital technology, the amount of data that needs to be stored is increasing, and meeting the requirements of high storage is an important issue that DVR vendors need to face. Currently, storage methods mainly include embedded hard disks, disk arrays, and network storage. Video surveillance system from analog data acquisition, transmission, storage to digital data collection, transmission, storage, from the original space limit to the current remote monitoring, remote storage, remote recovery technology applications, with the improvement of the system, is also After a step-by-step evolution and improvement, the future will integrate NAS, SAN, ISCSI and other technologies, and complete the storage of data directly through the network is also an inevitable trend of storage technology development.
4. Interface
With the popularity and development of digital devices, video recorders are required to be more flexible and versatile in data storage and video and audio input and output. On the basis of complying with international agreement standards, expanding the application range of DVR and the stability of interface applications will be an important technical direction to meet the needs of market development.
5. Interface
Improving the software operating interface and increasing the added value of software profits is a direction that every DVR vendor is looking forward to. Starting from the details of appearance, interface, operating habits, etc., changing the image of China's manufacturing, the DVR is closer to the user's use; the application of the graphical interface, the clarity of the color will bring a new feeling to the people, is the customer Select the basic indicator of the product. Vigorously improving GUI development technology and user-friendly design will become an important external factor in the application of DVR market.
6. Intelligent technology
Intelligent technology enables the "eye" function of the video surveillance system to have a certain "brain" thinking and judgment ability, so that the identification and processing of the personnel who need to be on duty should be handed over to the computer, thereby greatly reducing the workload of the on-duty personnel and improving the security quality. Through automatic intelligent analysis of camera video images, the target automatic lock tracking, automatic warning, automatic alarm, automatic recording and other functions are realized. The use of intelligent analysis technology to improve the added value of products is the direction pursued by all manufacturers, is the fundamental manifestation of enhancing the core competitiveness of enterprises, and is also the main means to enhance international competitiveness. With the advancement of projects such as “Safe Cityâ€, massive video information has made DVRs to solve storage problems on the one hand, and to provide strong support for remote or local retrieval on the other hand.
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