DVR (digital video recorder) is more than a few years ago following the analog video systems after the rapid development of second generation surveillance system.
Initial DVR using computer and Windows platform, in the computer to install video compression card and the appropriate DVR software, different types of video cards can be connected to 1/2/4-channel video, supports real-time video and audio, are the first generation analog digital monitoring system upgrade, also known as soft compression scheme.DVR system features: video and audio signal acquisition, storage, mainly to digital form and higher quality; system function more powerful and perfect; and information systems can exchange data; application flexibility.
Press the video recorder's structure can be divided into PC-DVR and DVR.PC-DVR: early DVR is a PC based on development, is in the video capture card, use software compression, and storage, take up significant system resources, along with the video compression standards promulgated and dedicated chip development, PC-based digital video recorder structure development for image compression card + commercial computer structure, also called hard compression method.
DVR generally refers to non-PC system, the internal operating system and applications written to a dedicated on-chip, as the application for a specific video monitoring equipment.
Embedded digital video recorder uses the integration of design, integration, video capture, video compression, video storage, PTZ camera control and remote transmission functions to ensure system stability and reliability, along with advances in technology and the use of need, has multiple network interfaces, using the TCP/IP Protocol, and implementation of LAN, Wan remote transmission function of network-embedded digital video recorder.Digital video recorder (DVR: DigitalVideoRecorder) initially applied to the financial, transportation, security monitoring, camera, and so video capture device that you want to monitor the content in a specific format to save on your hard disk, so you can choose at any time any content for playback.
Because of the storage media is based on the hard disk instead of the traditional tape, we simply call it "DVR". Through configuration, Digital hard disk recorders can easily achieve data format conversion, encrypted storage, remote control, rate control and multichannel recording and playback simultaneously, which is based on the recent electronic and communications sector the characteristics of the new technology to make it in the monitoring area completely replace traditional tape-based media means of traditional video. These new features, especially its high reliability and reusability, TV production and broadcasting industry, is also very attractive.The next two years, the trend of DVR
1. the definition
Clarity has always been customer choice product of a key indicator, the image quality is the evaluation of the quality of digital video recorders.
With high definition technology development and universal access to high-definition camera, HD DVR is the DVR manufacturers next generation product development goals.2. more efficient compression algorithm
In order to meet the needs of high-definition storage, improve image storage time, reduce the amount of bandwidth transfer, DVR manufacturers are development of more efficient compression algorithm, the universal application of the compression algorithm is simplified H.264.
3. centralized storage
As digital technology advances, the amount of data to be stored is growing to meet the demands of high storage DVR manufacturers need facing an important task.
The current storage mode are embedded hard disk drive, disk array and network storage. Video surveillance system from the analog data collection, transmission, storage, to digital data collection, transmission, storage, from the original space restrictions to now save remote monitoring, remote, remote recovery technology, with the perfection of the system, or you are experiencing evolutionary step by step, the future will be integrated NAS, SAN, ISCSI, etc, the data directly through the network for complete storage is storage technology development trend.4. the interface
As the popularity of digital devices and development, requirements for video recorders in data storage and audio input and output and a more flexible and versatile.
In line with international agreements on the basis of the standards, expanding the application range, DVR interface application stability, will meet the market development needs of an important technology direction.5. interface
Improve software interface, upgrading software profits added value is every DVR manufacturers have looked forward to the change of a direction.
From the look and feel, interface, operational practices, and other details, change China specifically to the manufacturing of image, DVR closer to the user's use; graphical interface applications, color clarity will be to bring a completely new feel, is the foundation of customers choose products. Promoting the development of GUI technology, humanized design, will become the DVR market applications of an important external factors.6. smart technology
Smart technology that allows video surveillance system "eyes" function to have a certain "brains" on the judgment, that the original needs to be on duty to intervene in recognition, processing by computer, thus greatly reduce on-duty staff workload, improve security and quality.
Through the camera video images for automatic intelligent analysis objective automatically lock tracking, automatic alarm, automatic alarm, automatic video recording capabilities. Using intelligent analysis technology to increase the added value of products is the manufacturer's direction, is to enhance the core competitiveness of enterprises, is also at strengthening the international competitiveness of the principal means. With the "safe city" and other projects, mass video information makes the DVR on the one hand to solve storage problems, on the other hand also to remote or local retrieval provides strong support.
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