Pvc Self-adhesive Floor Stickers pvc self adhesive flooring,peel and stick vinyl floor stickers,removable vinyl floor stickers,PVC floor glue floor sticker,pvc adhesive floor wallpaper JIANGSU ARTSTYLE DECORATION MATERIALS CO..LTD , https://www.artstyledecor.com
At the transmitting end, the network camera integrates image acquisition, video compression coding, communication control and transmission interface, and the video data is output through the IP network.
In the image acquisition part, CCD and CMOS sensors are designed for different needs. CMOS has certain advantages in high pixel, and CCD has better adaptability to monitoring scenes. In the video compression coding part, different compression algorithms and algorithm implementations determine the quality and coding efficiency of HD images. In the communication control part, the adaptability, security, code stream encapsulation format and transmission function of the network depend on the planning and design of the monitoring system. In the transmission interface part, different network access methods, such as wireless and wired, can be well supported; in addition, some network cameras also integrate other interfaces required for monitoring, such as alarm, control, and intercom.
At the receiving end, through decoding, output to a high-definition display device, such as an LCD, through a recording device, to record high-definition images.
Since the code stream of high-definition images is large, generally above 3 Mbps, image recording is an important part of realizing high-definition video recording. To record HD webcam images, we can use the following methods:
PC-NVR
Embedded NVR
Hybrid DVR
Either way, you should have the following requirements, such as:
Ensure that the video storage period requires sufficient storage space;
Ensure the validity of multi-channel concurrent records, that is, there should be no bottlenecks in the recording process;
Convenient and fast retrieval and playback efficiency;
With loop coverage, the efficiency of recording and retrieval should be guaranteed after multiple coverages;
Reliability and cost performance should meet the requirements of monitoring business.
PC-NVR uses PC-DVR development technology, and the SDK provided by HD network camera can be used for secondary development. The storage technology can be DAS, NAS, IPSAN, etc.
HD technology standard
High-definition video surveillance has developed rapidly in recent years, mainly to solve the problem that people cannot see the details in the normal monitoring process. "High definition" means "high resolution". The definition of high definition comes from the digital TV field. HDTV, also known as "HDTV", is a high definition TV standard format determined by the American Society of Motion Picture and Television Engineers. The definition of television is measured by the number of horizontal scanning lines. Its centralized HD division is as follows:
(1) 1080i format is a standard digital TV display mode. 1125 vertical scanning lines, 1080 visible vertical scanning lines, 16:9, resolution 1920×1080, interlaced/60Hz, horizontal frequency 33.75KHz.
(2) 720p format, which is a standard digital TV display mode. 750 vertical scanning lines, 720 visible vertical scanning lines, 16:9, resolution 1280×720, progressive/60Hz, line frequency 45KHz.
(3) 1080p format is a standard digital TV display mode. 1125 vertical scan lines, 1080 visible vertical scan lines, 16:9, resolution 1920×1080 progressive scan, professional format.
HDTV refers to the TV standard that supports 1080i, 720p and 1080p.
At present, the traditional monitoring system in the security industry can reach the standard definition. After digital encoding, it can generally reach the resolution of 4CIF or D1, which is about 440,000 pixels, and the resolution is between 300 and 500 TV lines. IP surveillance of the camera, if you want to achieve the clarity of 800 TV lines, then the resolution of the network camera should reach at least 1280x720, about 900,000 pixels; if you use a 2 megapixel network camera, you can achieve ultra high definition images. A network camera with a 16:9 aspect ratio is required, which corresponds to a resolution of 1920x1080 and a 4:3 aspect ratio network camera with a resolution of 1600x1200. The security industry is more borrowing the HD division standard in the TV field, commonly known as "HD" and "SD". Network cameras with resolutions up to 1080i and 720p have appeared in the security market because the network provides a high guarantee for the transmission of high-definition video. Of course, there are also analog cameras with high-definition transmission interfaces, such as guns or all-in-ones with Y/Pb/Pr and VGA interfaces.
Therefore, here we borrow a radio and television standard: a camera capable of reaching megapixels, with a 1080p resolution display device and corresponding transmission channel, can form a monitoring system that can be called high definition. There is currently no universal HD standard in the security video surveillance industry. Some manufacturers believe that the image reaches D1 is high-definition, and some manufacturers believe that more than 480 lines are high-definition, and there are different opinions. Here we can look at the DVR national standards. In 2006, the National Standard for Video Surveillance and Surveillance Digital Video Recording Equipment GB20815-2006 issued by the General Administration of Quality Supervision and Inspection of the People's Republic of China stipulates that the DVR is classified into Class A (resolution not less than 4CIF) and Class B (resolution less than 4CIF). According to the evaluation criteria of the above manufacturers, the A-class products in the DVR are high-definition products, and the B-class is a general-purpose product, that is, 4CIF (resolution 704×576) is high-definition, and CIF (resolution 352×288) is ordinary. Sharpness.
With the advancement of science and technology, "HD" technology will inevitably be introduced into the field of video surveillance, and the HD standard of the video surveillance industry will continue to improve.
High-definition monitoring basics: High-definition network cameras provide video surveillance sources. They have HD encoding and IP encapsulation of video, and carry high-definition images through IP networks, enabling high-definition surveillance and video surveillance.