As the saying goes, "The layman looks at the excitement, the insider looks at the doorway"; let you face a product that you are not familiar with, I believe that you can only say about it, which is to know why it is not known. I believe that many people don't know much about security monitoring. From a small white to a person in the industry, it is not a one-off event. Today, I am a teacher, and I have opened a crash course for netizens. How to let everyone quickly judge and monitor The camera is good or bad.
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Bell~~~~[Security Monitoring Crash Course] Start the class! This is the first class. We don't need to introduce more. It is very simple. In this class, we need to understand the monitoring products. Surveillance cameras are the highlight of security products. Let's start with the camera. Classmates, take notes and listen to class!
Security monitoring crash course and text teach you to be a monitoring expert
First of all, in the first lesson we can learn from the most basic. Judging whether a product is good or bad must be external and internal. This is the common standard for all products, as is the surveillance camera. From the housing of the surveillance camera we can initially determine the quality of this product. The good outer casing is made of pure aluminum alloy die-casting. It has a heavy feeling on the hand and is not easy to corrode, deform and break. The poor outer casing is made of recycled metal wire and is light in the hand. Brittle, easy to break, deform. Obviously, we can give the product a score in the workmanship process.
Surveillance camera outer casing is good or bad at a glance - "hard" road
Regardless of the texture of the surveillance camera's casing, the user simply confirms whether the merchant is at the core of the product or at the core of making money. Perhaps consumers can also choose products that are slightly more expensive, and they will not choose low-quality surveillance cameras. After all, these security products are to provide everyone with a safe guarantee.
The second lesson: infrared light. For surveillance cameras, not only must people meet the needs of daytime monitoring, but night surveillance missions are more important. It is essential to monitor infrared light in a night vision environment. From the first generation of infrared lamps to the current third-generation infrared lamps, the arrangement of infrared lamps also determines the service life of the products. In this way, infrared lamps play an important and fragile role in surveillance cameras.
Infrared light control board is very important
A good infrared light board, uniform illumination, long life; the light board will be developed with a control panel for the voltage and current instability of the transformer, for self-regulation of steady voltage; and the poor light board is not only cheap to use The wick, even the most basic control board. As we all know, the distance of infrared light is limited. Many JS forcibly increase the power, sacrifice the service life of the infrared light, and let the infrared light reach a farther distance. After three months, the light source will start to decay, night vision. The range may be changed from the original 20 meters to 5 meters until it disappears. Infrared lamp attenuation is an inevitable result, but if a surveillance camera night vision function cannot be used continuously for more than one year, then this product directly locates the non-conforming product.
Lesson 3: Monitor the lens for good or bad. Xiaobian has written many articles about the selection of surveillance cameras. The good lens IR night vision focus adjustment is precise, the lens surface coating is fine, and the transparency is excellent; many lenses even reach megapixels, which can be carried out with high-line machines. Matching can fully exploit the advantages of high-line cameras. Poor lens IR night vision focus is unstable, the infrared light is easy to run at night, the lens surface coating is very poor, more importantly, not to mention megapixels, perhaps even 300,000 pixels are difficult to meet the standard.
Monitor the lens's microfocus problem
The surveillance lens is like a human eye. If there is a problem with the eye, no matter what kind of image can be recorded. If the person's eyes can't focus and his eyes are scattered, it's hard to tell what kind of state the person is currently in.
Lesson 4: Boarding. The surveillance camera is a highly concentrated electronic product, like a computer motherboard with different slots, capacitors and other 0110110 digital commands. Different board structures can be seen from the experience of the manufacturer, and the solutions promoted by the R&D companies are also commendable; they can fully utilize the advantages of the high-speed board machine, with lightning protection design and wide power supply design. When the voltage and current are unstable, the board is rarely burnt. On the contrary, some small security workshops will always shoddy and even buy some used electronic components and re-weld them on the board.
Enterprise strength determines the board design
For surveillance cameras, there are not many standards for judging the quality of products by the naked eye. As far as the store is concerned, as the trend of surveillance camera price transparency increases, we can feel that surveillance products are no longer out of reach. Even online malls can launch surveillance cameras one after another. Perhaps high-end security products take industry solutions and civilian security products can coexist with 3C products.
An enterprise monitoring product design plan (picture from Baidu Library)
In addition to today's four classes, Xiao Bian also reminds everyone that surveillance cameras can't be too cheap, and it is better to measure the camera's good and bad from the image. A qualified monitoring product needs to undergo high temperature aging for 24 to 48 hours. It can be said that this is a test of the quality of the surveillance camera in a simulated environment; the image generated by the aging product still conforms to the standard, so that it can be smooth. Arrived in the store.
When conditions permit, Xiaobian suggests that users can verify the good or bad of the product through the actual test method. In particular, the analog surveillance cameras with relatively mature technology can be seen directly after being connected with the monitor; we will do an imaging test with different lenses and different illumination environments. Whether it's product appearance or actual functional testing, perhaps today's content will make you feel good.
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