Astronaut and you clarify several basic issues of HD network cameras
2018-04-25 09:00:29
The basis of high-definition surveillance is the front-end, namely, high-definition network cameras. Only in this stage, high-definition video can be realized in storage, display, browsing, and other links. This article will discuss with you some of the basic issues related to high definition network cameras.
What is HD monitoring?
For video surveillance, image clarity is undoubtedly the most critical feature. The clearer the image, the more obvious the details, the better the viewing experience, and the higher the accuracy of application services such as intelligence. So image clarity is the eternal pursuit of video surveillance.
The standard for measuring image sharpness is resolution, and the unit is pixel. The larger this value, the clearer the image. The so-called HD, SD, the difference is also reflected here. The dividing line between the two is megapixels or 720p, reaching megapixels or 720p is HD. Based on such standards, CIF and D1, which currently dominate the video surveillance market, are standard definition.
Whether it is from the perspective of resolution, display effect or fluency, HD has more advantages than SD. In terms of resolution, the resolution of 720p is 9 times that of CIF, the resolution of 1080i/1080p is 20 times that of CIF, and in the same display environment, HD will be much clearer. From the display effect, HD supports both large-screen display and 16:9 wide-screen display, which can greatly enhance the user's viewing experience. In terms of fluency, HD supports higher frame rates. For example, 720p and 1080i/1080p can both support 60 frames per second or 60 fields per second, and its image fluency is twice as high as standard definition. Therefore, high-definition monitoring will inevitably replace standard definition monitoring.
Why HD front end monitor must be HD network camera?
We know that traditional SD monitoring is divided into analog, digital, and network types. The front end of the analog monitor is an analog camera, and the back end is a matrix. The digital surveillance front end is also an analog camera and the back end is a DVR. There are two types of network monitoring front-ends, one is an analog camera + video encoder, one is a network camera, and the back end is a platform. In other words, in the era of SD surveillance, there are many types of analog cameras, network cameras, video encoders, and analog cameras at the front end.
Then why did the high-definition monitoring era, the front end must be high-definition network camera? There are two main reasons.
First, high-definition monitoring must be networked. It must be based on video compression processing and transmitted over an IP network. This is the only way to control the transmission cost of high-definition video.
Uncompressed high-definition video signals after the acquisition have both analog and digital transmission methods. Analog transmission generally uses YPbPr component transmission, and one HD video signal needs three coaxial cables to transmit at the same time. Digital transmission generally uses DVI, HDMI, or HD-SDI transmission. The transmission distance of DVI or HDMI is only a few meters, which is not suitable for monitoring and transmission. Although HD-SDI can transmit about 100 meters, it has high requirements for coaxial cables. Cable prices are also very expensive. Whether it is analog or digital transmission, the transmission cost of uncompressed high-definition video signals is significantly higher than that of analog SD video signals. With video compression coding and transmission over IP networks, the difference in transmission costs between high-definition video and standard-definition video is small.
Second, the efficiency and cost of directly using high-definition network cameras for front-end processing are better than using high-definition video encoders and high-definition cameras.
The current high-definition video sensor is mainly CMOS. The CMOS sensor directly outputs the digital video signal. In the infrared camera, the digital high-definition video signal is directly compressed and encoded by the DSP or ASIC, and then transmitted in a networked manner, and the output is higher than the direct output of the camera. The signal is economical and the processing efficiency is higher.
This is why all high-definition surveillance front-ends we can see on the market today are HD network cameras.
Guangzhou Aosin Electronic Technology Co., Ltd. specializes in the development of the security monitoring industry. Its “Tianshida Onsee†brand million HD monitoring equipment: million HD cameras, HD video decoders, central management servers, platform management software, and providing high-definition Monitoring system solution! Make monitoring more clear, more stable, and more affordable.
Guangzhou Aosin Electronic Technology Co., Ltd. Fax Company Telephone National Free Hotline Telephone Company Address: Room 904, Dexing Mansion, Fengxing Plaza, No. 25, Tianhe South Road, Guangzhou
- Astronomical Technology Department
What is HD monitoring?
For video surveillance, image clarity is undoubtedly the most critical feature. The clearer the image, the more obvious the details, the better the viewing experience, and the higher the accuracy of application services such as intelligence. So image clarity is the eternal pursuit of video surveillance.
The standard for measuring image sharpness is resolution, and the unit is pixel. The larger this value, the clearer the image. The so-called HD, SD, the difference is also reflected here. The dividing line between the two is megapixels or 720p, reaching megapixels or 720p is HD. Based on such standards, CIF and D1, which currently dominate the video surveillance market, are standard definition.
Whether it is from the perspective of resolution, display effect or fluency, HD has more advantages than SD. In terms of resolution, the resolution of 720p is 9 times that of CIF, the resolution of 1080i/1080p is 20 times that of CIF, and in the same display environment, HD will be much clearer. From the display effect, HD supports both large-screen display and 16:9 wide-screen display, which can greatly enhance the user's viewing experience. In terms of fluency, HD supports higher frame rates. For example, 720p and 1080i/1080p can both support 60 frames per second or 60 fields per second, and its image fluency is twice as high as standard definition. Therefore, high-definition monitoring will inevitably replace standard definition monitoring.
Why HD front end monitor must be HD network camera?
We know that traditional SD monitoring is divided into analog, digital, and network types. The front end of the analog monitor is an analog camera, and the back end is a matrix. The digital surveillance front end is also an analog camera and the back end is a DVR. There are two types of network monitoring front-ends, one is an analog camera + video encoder, one is a network camera, and the back end is a platform. In other words, in the era of SD surveillance, there are many types of analog cameras, network cameras, video encoders, and analog cameras at the front end.
Then why did the high-definition monitoring era, the front end must be high-definition network camera? There are two main reasons.
First, high-definition monitoring must be networked. It must be based on video compression processing and transmitted over an IP network. This is the only way to control the transmission cost of high-definition video.
Uncompressed high-definition video signals after the acquisition have both analog and digital transmission methods. Analog transmission generally uses YPbPr component transmission, and one HD video signal needs three coaxial cables to transmit at the same time. Digital transmission generally uses DVI, HDMI, or HD-SDI transmission. The transmission distance of DVI or HDMI is only a few meters, which is not suitable for monitoring and transmission. Although HD-SDI can transmit about 100 meters, it has high requirements for coaxial cables. Cable prices are also very expensive. Whether it is analog or digital transmission, the transmission cost of uncompressed high-definition video signals is significantly higher than that of analog SD video signals. With video compression coding and transmission over IP networks, the difference in transmission costs between high-definition video and standard-definition video is small.
Second, the efficiency and cost of directly using high-definition network cameras for front-end processing are better than using high-definition video encoders and high-definition cameras.
The current high-definition video sensor is mainly CMOS. The CMOS sensor directly outputs the digital video signal. In the infrared camera, the digital high-definition video signal is directly compressed and encoded by the DSP or ASIC, and then transmitted in a networked manner, and the output is higher than the direct output of the camera. The signal is economical and the processing efficiency is higher.
This is why all high-definition surveillance front-ends we can see on the market today are HD network cameras.
Guangzhou Aosin Electronic Technology Co., Ltd. specializes in the development of the security monitoring industry. Its “Tianshida Onsee†brand million HD monitoring equipment: million HD cameras, HD video decoders, central management servers, platform management software, and providing high-definition Monitoring system solution! Make monitoring more clear, more stable, and more affordable.
Guangzhou Aosin Electronic Technology Co., Ltd. Fax Company Telephone National Free Hotline Telephone Company Address: Room 904, Dexing Mansion, Fengxing Plaza, No. 25, Tianhe South Road, Guangzhou
- Astronomical Technology Department