The advent of the era of high-definition surveillance has brought unlimited possibilities to the development of the security industry. In order to be able to make a difference in the new market of high-definition, all manufacturers have all strengths and hope to win through innovation in various technologies, solutions and applications Good reputation and recognition of customers in the HD market. The following is a detailed interpretation of the manufacturer's innovative new technology-HDCVI technology, in order to bring some inspiration to the industry.
During the development of high-definition video in the security industry, whether it is technology or systematic application, it has experienced the practice and exploration of various standards and protocols. Nowadays, HD-SDI and network technology are the main technologies of high-definition monitoring, and each has its own advantages to seize the market share of high-definition. Recently, some manufacturers have launched HDCVI technology. As a new force, how should HDCVI systems emerge in the booming security market?
In the era of high-definition surveillance, megapixel cameras have become the industry's entry standard, and the product form is mainly divided into two camps: HD-SDI cameras and high-definition network cameras. Among them, HD-SDI cameras follow the transmission standard of the radio and television system, transmitting 720P and 1080P uncompressed digital video signals; high-definition network cameras compress images in H.264 and other formats, and use the network to transmit compressed video. The HDCVI technology uses completely different technical methods from these two. This article will analyze the prospects of the HDCVI system from three aspects: technology comparison analysis, system solutions, and technology development trends.
Comparison and analysis with various HD technologies
HDCVI technology is based on coaxial cable transmission of high-definition composite video signals, using analog modulation technology, progressively transmitting 1280H (1280x720) and 1920H (1920x1080) resolution high-definition video signals. HDCVI technology has a megapixel-level carrying capacity, including 1280H @ 25fps, 1280H @ 30fps, 1280H @ 50fps, 1280H @ 60fps, 1920H @ 25fps, 1920H @ 30fps six formats. The monitoring system using HDCVI technology can achieve lossless and delay-free video and audio transmission and data communication between devices from HD cameras to HD DVRs, and ensure that HD videos are reliably transmitted within a distance of 500 meters and above.
HDCVI PK HD-SDI technology
Compared with HD-SDI technology, HDCVI has a competitive advantage in the field of high-definition video transmission over coaxial cables. First, both HDCVI and HD-SDI transmission technologies can transmit high-definition video with 720P and 1080P effective resolution, but HDCVI has inherent advantages in transmission distance.
First of all, HD-SDI can currently transmit 100 meters in a better transmission medium environment. Even if the next version of the HDcctv Alliance v2.0 uses compression technology, the transmission distance can only be achieved in a better transmission medium environment. The theoretical 300 meters. HDCVI can currently transmit at least 500 meters with 75-3 cable and very low signal distortion; when using 75-5 or better cable, the transmission distance can be further extended, while also ensuring the transmission of video quality;
Second, HD-SDI has poor anti-interference ability, especially in environments with high-frequency radiation, such as mobile phones and wireless routers. Strong high-frequency wireless electromagnetic radiation interferes with HD-SDI, resulting in high bit errors in video data The rate is manifested by abnormal images, flower screens, and inability to lock. HDCVI adopts low-frequency analog modulation technology, which essentially avoids the interference of high-frequency wireless electromagnetic radiation from the technical principle. Even in a strong interference source environment, it can still ensure high-quality image transmission;
Third, in the actual construction of HD-SDI, there are strict requirements for the choice of wiring environment and construction method, mainly manifested in the requirement for high quality of the installed cable, and the connection is not allowed midway; the welding quality of the connection terminal and the installation path are low Radiation, etc., all put high demands on the quality of construction personnel, construction costs, the complexity of installation and maintenance, and the design of route alignment. HDCVI technology follows the construction requirements and wiring specifications of simulated standard definition, and ordinary weak current construction personnel can quickly deploy high-definition monitoring subsystems.
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