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In the current field of video surveillance, IPC network high-definition cameras have become a trend. Faced with various forms of IPC in engineering projects, there are generally some misunderstandings in resolution, infrared distance, compatibility, and remote access.
Misunderstandings:
Analog Cameras We generally use line counts (TVLs) to represent the sharpness of a camera. Web cams generally use resolution to represent sharpness.
The current mainstream IPC resolutions are:
720P:1280*720, corresponding to 1 million pixels, recommended stream: 2M;
960P: 1280*960, corresponding to 1.3 million pixels, recommended stream: 3M;
1080P: 1920*1080, corresponding to 2 million pixels, recommended stream: 4-5M;
1536P: 2048*1536, corresponding to 3 million pixels, recommended stream: 5M;
4K: 3840*2160, corresponding to 8 million pixels, stream: 8M or more;
Misunderstanding 1: The higher the resolution, the better
High-resolution, high-stream: Selecting the appropriate resolution depends on the actual needs of the project, the current encoding is H.264 algorithm, the higher the resolution, the greater the stream, the more space occupied by the hard disk per unit of time, The cost of IPC is getting lower and lower, but hard drive costs that can't be ignored have risen linearly. Therefore, the IPC resolution used by most projects is based on 960P and 1080P.
In addition, at present, the market is mixed, and manufacturers who do not pay attention to the brand image are usually attracted to the eye with high scores and low code streams. However, if the number of frames is not enough (less than 25 frames/s), the picture is not real-time, and the resolution is higher. egg;
Misunderstanding 2: The higher the resolution, the better the night vision effect
Not necessarily, the night vision effect is mainly to look at the IPC's CMOS chip's photosensitivity, chip illumination is not to force, the resolution is no better than the night vision effect.
Infrared radiation distance error:
Infrared bolt machine parameters will be marked on the infrared range, such as: infrared distance of 50 meters. However, in actual use, some engineering companies generally reflect that the infrared distance is not enough, and the marked parameters have moisture.
Aside from falsifying product parameters, 50 meters of parameters generally refer to the infrared radiation distance under the appropriate lens. The infrared light we see is actually a light cup for concentrating light. The light cup has an angle. The principle of a flashlight lamp cup is the same. The narrow-angle radiation is far, and the wide-angle radiation is near. The specification of the lamp cup matches the camera's lens.
This is a good understanding of the infrared distance marked 50 meters, the actual optional 4mm wide-angle lens, infrared gun irradiation distance must reach less than 50 meters.
Therefore, in the project design phase, the deployment of infrared cameras needs attention at the same time: perspective, lens, infrared distance and other factors. Otherwise, the source of the design phase will be wrong, and the final result will be no better.
Misunderstandings:
At present, the HDV network monitoring system is the most widely used ONVIF compatible protocol, and has become the platform standard for unified management of domestic network cameras. Therefore, the high-definition network cameras provided by the manufacturers should be able to support the latest version of the ONVIF protocol, which can be compatible with the use of more products and unified management to achieve interconnection and data sharing.
Even so, compatibility issues in IPC selection still deserve attention.
Different brands at the front and back end can implement most of the IPC functions through the ONVIF protocol. However, due to the limitations of the public protocol, some functions of the back end cannot be used for the camera, such as the modification of the IP address, parameter setting, and alarm linkage. . Although the camera's client or IE browser can maximize the function of the camera, but taking into account the integrity, the use of the same brand before and after the use of proprietary protocol docking is the best choice.
In addition, different brands of ONVIF protocol docking problems, there are still some uncertainties, on the issue of compatibility, if not measured by yourself, it is best to listen to the views of manufacturers, compatibility issues from manufacturers to give test opinions and results.
Remote access errors:
In the era of network monitoring, remote access has become an essential requirement for monitoring projects. However, often the results are often unsatisfactory. Engineers' friends often feed back the remote access screen too often, or they often drop the line. Now do some analysis on the root cause of this problem:
P2P penetration technology
P2P is an abbreviation of English Peer-to-Peer (Peer to Peer) and is also referred to as "Peer to Peer." The P2P (Point-to-Point Communication) technology is a new network technology that relies on the computing power and bandwidth of the participants in the network instead of gathering the dependencies on a few servers.
Advantages: no port mapping, each device has a unique ID registration registration, simple and convenient set-up, point-to-point connection, plug and play, apply to the access side has no fixed IP environment;
Disadvantages: Devices generally need to rely on third-party P2P servers for registration, and cloud server stability is the key to stable access;
Fixed IP technology:
The front-end IPC is a fixed external network IP, self-built forwarding service, and remote addressing directly accesses the fixed IP.
Advantages: No dependence on third-party platforms, its own fixed IP, good stability.
Disadvantages: higher costs, technical difficulties, and difficult maintenance.
Bandwidth is the key:
Usually we have access to broadband ADSL or fiber-optic line, the bandwidth is generally known as 10M or 100M, this number generally refers to the downlink bandwidth. However, our remote access to the IPC occupies the upstream bandwidth of the visited end. In general, 10M optical fiber line, the uplink bandwidth will not exceed 2M, that is, if you want to use the 720P resolution screen for remote access, all the way is very reluctant.
In order to solve this problem, in the actual application of the project, remote access we usually use substream to upload, such as: D1/CIF. If the remote picture quality needs to be synchronized with the site, only the private network or leased line will be built, but the cost will not be affordable for the general project.
Therefore, in the phase of project negotiation, the engineering contractor’s friends are the highlight of the project. However, Party A’s expectations cannot be overestimated. It should allow Party A to have a clear understanding of the bandwidth issue. Otherwise, the effect cannot meet the design expectations. Too much trouble for project acceptance is lost.