Choosing a webcam from A4TECH

The development of modern technologies is proceeding very quickly, and now it is possible to communicate with people thousands of kilometers away not only by telephone, but also via video communication. All that is needed is a small detail - a webcam.

The webcam was released in 1991. Its use was very interesting. It was located at the University of Cambridge, where a group of scientists worked. Her task was to track the presence of coffee in the coffee maker. Special software was written for it, and from any computer located in the laboratory, it was possible to connect via a client connection, where the image was broadcast in real time.

Today they have become more advanced, and are used for calls and conferences, for video surveillance and photographs at the front desk. The peculiarity of the video communication technique is that more attention is paid to the speed of information transmission, rather than to the picture and sound.

There are lines of webcams with a PTZ device, they have a built-in 360 ° video surveillance function.

The matrix is ​​the basis of the mini-camera. Today, two main ones are used:

• CMOS - sensor matrix;
• CCD - a matrix of this format transmits a high quality picture with a low level of "noise".

There are two types of device connection:

• wired - work is done via the USB connector;
• wireless — a two-part connection — a transmitter and a receiver — usually using Wi-Fi to pass the signal.

The camera is fixed in several ways:

• monitor mount - mounted on a laptop or on a desktop computer monitor;
• desktop - have a stable mount, you can conveniently place it on any flat surface;
• universal - made with a special clip in the form of a stand, easily placed on any surface.

Many cameras have additional features:

• built-in microphone;
• backlight;
• autofocus;
• face tracking function.

These functions are not included in the basic webcams, these options have more complex series of cameras, however, add-ons do not significantly increase the cost of the device, the A4Tech brand produces a line that is available to the owner of any budget.

The range of cameras is extensive, all of them are made with an original design, and each line has its own functionality.

• Models with standard resolutions. This line includes A4Tech PK-8MJ, which has an unusual case, thanks to which you can adjust the height of the device. Has the ability to take a snapshot. Desktop mount.

• With a folding case. The line is represented by the A4Tech PK-810G camera. Externally, the camera is a small rectangular block connected to the support by a flexible cable. USB wired connection.

The stand of the web device is universal.

• Flexible base device - A4Tech PK-333E. The body is made in a classic design, which looks like a DVR. Clothespin mount. The ability to rotate the camera 360 degrees.

High Resolution Webcams - A4Tech PK-910H Series. The connection, as with previous models, is via USB. The viewing angle is 60 degrees. The main advantage is the system color compensation, which provides a good picture even in low light. The presence of the "multisampling" system smooths out distortions in the video communication mode.

The first and most important criterion from which to start when choosing a webcam is the purpose of using the device. For home calls via the Internet, simpler models are also suitable, if the device is purchased for official events, high-resolution models are required using a high-quality image.

Key features to look for when buying a camera:

• matrix type;
• resolution is one of the most important parameters on which the image quality depends;
• sensitivity;
• the number of transmitted frames per second;
• focusing;
• connection type;
• additional functions.

Webcams have a different set of characteristics, but the main selection criteria are similar. Depending on their price, they are equipped with additional features and have a unique external design. In addition, some models have video surveillance capabilities and are equipped with a motion sensor.

The following video provides an overview of the A4-Tech PK-770G webcam.