Briefly describe the calibration board for machine vision applications

   In machine vision applications, the use of calibration boards is very necessary, because for precision measurement, the distortion of the lens itself is inevitable, and at the same time, it needs to achieve the accuracy that satisfies the customer. Therefore, the image itself is required to be very real and accurate, otherwise the software level No matter how high it is, it is still processed based on images with errors, and the final result will definitely have a large error.

High-precision system calibration is the premise and foundation for precise measurement and inspection of machine vision systems. It can improve the accuracy index of your measurement system in two steps.
The first is error measurement and evaluation. The high-precision calibration system realizes this process through the image collected by the ultra-precision professional image calibration plate in your machine vision system environment, and cooperates with the professional calibration algorithm. The system can accurately obtain The error value at any position within the field of view, and based on this error data, the accuracy level of the machine vision system is evaluated.
The second step is the correction and compensation of the error image. The calibration system performs position correction and compensation for each pixel information on the image based on the error data obtained in the first step. This process involves image translation, rotation, interpolation, reconstruction, brightness compensation, etc. A precision image algorithm. After correction and compensation, the image can more accurately reflect the actual situation of the item being measured, achieving the purpose of precise measurement and detection.
Any machine vision system involving position and dimensional accuracy must be calibrated, but the calibration method can be appropriately selected according to different application fields. In general, the accuracy of the calibration system should be in the same order of magnitude as the accuracy requirements of the measurement system, and the calibration error should not be greater than For a measurement unit, for example, the accuracy requirement of the measurement system is ±50 microns, then the accuracy of the calibration system must reach 10 microns, and the calibration system error cannot be greater than 10 microns.