A webcam connected to your computer makes it possible for a hacker to use the webcam to spy on you. Whether the hacker is doing it for entertainment or for industrial espionage, it's a definite privacy issue at a minimum. If you still need to have a webcam, keep your computer as secure as possible and consider using a webcam with a light that lets you know when its active, unplugging it when you aren't using it or putting a piece of tape or a sticky note over its lens when you aren't using it.
2020-05-08
When it comes to the working principle of USB cameras, Camorui Electronics has to start from the beginning, and then start with the classification of cameras.
Cameras are divided into two categories: digital cameras and analog cameras. The analog camera can convert the analog video signal generated by the video capture device into a digital signal, and then store it in the computer. The video signal captured by the analog camera must be converted into a digital mode by a specific video capture card, and compressed before it can be converted to a computer for use. The digital camera can directly capture the image, and then transfer it to the computer through the serial, parallel or USB interface. Nowadays, the cameras in the computer market are basically digital cameras, and the digital cameras are mainly USB digital cameras using a new data transmission interface. Most of the products currently visible on the market are these products. In addition, there is a product that works with video capture cards, but it is not yet mainstream.
Due to the rapid popularity of personal computers and the high overall cost of analog cameras, the transmission speed of the USB interface is much higher than that of the serial and parallel ports. Therefore, the current market hotspot is mainly the digital camera with the USB interface. The following mainly refers to the digital camera with USB interface.
The working principle of USB camera
The working principle of the camera is roughly as follows: the optical image generated by the lens (LENS) is projected onto the surface of the image sensor, and then converted into an electrical signal, which is converted into a digital image signal after A/D (analog to digital conversion), and then sent to the digital The signal processing chip (DSP) is processed in the processing, and then transmitted to the computer through the USB interface for processing, and the image can be seen through the monitor.
Kamorui Electronics will introduce the advantages and disadvantages of usb cameras. I hope that when you buy, you can learn more about it so that you can buy which one is most suitable for you. The computer can use ordinary USB chat camera to do enterprise-level intelligent monitoring.
Advantages of USB camera：
The price is low, and the USB camera is now the standard configuration. The technical threshold is low, and users do not need to know too much professional knowledge, just install it directly. It can be deployed quickly without setting up a dedicated server.
Disadvantages of USB camera：
The camera cannot be arranged for a long distance. Generally, the USB extension cable is only about 10 meters. If it is too long, the power supply of the USB camera will be insufficient or unstable. The reflection sensitivity is not as good as the professional camera. The general USB camera only has 30 frames per second. Our company's usb3.0 can reach 60 frames per second high-speed USB camera.
A single computer only holds a small number of lenses. This is limited by the total USB bandwidth of the computer motherboard. Therefore, some computers can open 2 cameras at the same time, while others can open 5 cameras. The professional ones can be 16 channels, 32 channels and so on.
Software is that software compressed video occupies a large amount of CPU, which has certain requirements for computer configuration, and professional monitoring has hard compression, which uses hardware to complete video compression, which takes up less CPU.
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