Questions and answers on industrial camera selection

What are the steps to choose an industrial camera? What parameters do I need to know when selecting an industrial camera? This article mainly introduces the relevant knowledge of common selection of industrial cameras.

1. What is the meaning of pixel depth in http://www.dhkj123.com/ industrial cameras?

    The digital signal output by a digital camera, that is, the gray value of a pixel, has a special number of bits, which is called the pixel depth. For black and white cameras, the orientation of this value is usually 8-16bit. The cell depth defines the number of gray levels in which gray levels are illuminated by dark channels. For example, for an 8-bit camera, 0 means full darkness and 255 means full light. A number between 0 and 25 represents a certain brightness indicator. 10bit data has 1024 gray levels and 12bit has 4096 gray levels. For each application we have to carefully consider whether we need very fine gray levels. Increasing from 8-bit to 10-bit or 12-bit can indeed increase the measurement accuracy, but it also reduces the speed of the system and increases the difficulty of system integration (increased cables and larger sizes), so we must also choose carefully.

2. What are the general steps for selecting a camera at http://www.dhkj123.com/?

The first step is to first know the system accuracy requirements and the resolution of the industrial camera;

The second step is to know the system speed requirements and the imaging speed of the industrial camera;

The third step is to consider the industrial camera and the frame grabber together, because this involves the matching of the two;

The fourth step is the comparison of prices.

3. Which of the industrial cameras need to match the frame grabber for normal use?

    Industrial cameras need to match the frame grabber for normal use, and generally need to match the following:

a. For video signal matching, there are two formats for black and white analog signal cameras, CCIR and RS170 (EIA). Generally, the capture card supports both industrial cameras;

b. Matching resolution, each board only supports cameras in a certain resolution range;

c. Matching of special functions. If the special functions of the camera are used, first determine if the board used supports this function. For example, if multiple cameras are to take pictures at the same time, the capture card must support multiple channels. If the camera is scanned progressively , Then the capture card must support progressive scanning;

d. Match the interface to determine whether the interface between the camera and the board matches. Such as CameraLink, Firewire1394, etc.

4. How to set the "Automatic Gain Control" function in industrial cameras?

    The industrial camera has a video amplifier that amplifies the signal from the CCD to a level that can be used. The amplification, that is, the gain, is equivalent to a high sensitivity. However, in a bright light environment, the amplifier will overload and distort the video signal. When the switch is ON, the lens aperture is fully opened in low brightness conditions, and the gain is automatically increased to obtain a clear image. When the switch is OFF, natural and low-noise images can be obtained at low brightness.

5. How to choose a frame grabber?

    When purchasing and using frame grabbers, two key factors to consider are: the reliability of the hardware and the support of the software. All other things being equal, a complex card with more devices will dissipate more heat than a card with fewer devices. Good design will use more ASIC (Application-specific integrated circuits) and programmable devices to reduce the number of electronic devices and achieve higher functionality. You can also choose cards with fewer useless functions to reduce unnecessary hassles.

    Overvoltage protection is an important indicator of reliability. Close to high voltage will generate a strong surge in the video cable. Adding an overvoltage protection circuit to the video input and I / O port can protect the capture card from high voltage breakdown caused by electromagnetic interference in the industrial environment. When choosing a capture card, you must also consider whether the software to be used by this vision system is compatible with the capture card, whether it is convenient to use, and whether its software requires payment.