Cameras are now appearing more and more in daily life, and have brought a lot of convenience to life, such as recognizing license plate numbers when entering and exiting parking lots, calculating distances in monitoring, etc. Everyone is very familiar with the camera, but the calibration plate that is often bound to it is not familiar to everyone, or even heard of at all, so what is a calibration plate?
The calibration plate is a panel with a specific pattern, which is used to calibrate the lens distortion of machine vision, machine vision, image measurement, photogrammetry, and 3D reconstruction, determine the conversion relationship between physical size and pixels, and establish a geometric model of camera imaging. So what is calibration?
Let’s look at a picture first:

Given only one picture, we cannot judge the size of this product, so we add a ruler:

We can now measure the size of the product according to the scale of the ruler now. Then let’s look at another picture:

For us, this is a black and white checkerboard grid, but in the digital world of computers, this is an array of 0s and 1s. For example, a black grid is 0 and a white grid is 1. A rule is set in the visual system, the length of each number is 1, that is, the width of each grid is 1, and then we put the product on it:

At this time, the computer can calculate the length and area of the product according to the rules we set. At this time, the calibration plate plays the role of size calibration. Lens distortion will occur during the imaging process:

Now in order to correct the distortion after imaging, we need to use an algorithm to correct it,

Use the calibration plate as a standard to set the algorithm to correct the lens image to get as realistic a picture as possible.
The calibration plate is a very important product in industrial production. The checkerboard pattern is the most widely used pattern and the easiest pattern to design and produce, so it is relatively common. However, with the widespread use of camera lenses and the increasing role of machine vision, the usage scenarios are becoming more and more diverse and complex, and the usage methods and corresponding algorithms of calibration boards in different application scenarios are strongly related. Combination patterns can be designed according to the way of use to adapt to different application scenarios, so the customization of the calibration plate is a trend, and it is very important to choose an excellent calibration plate supplier. OSTHK is a very suitable supplier. It can provide customized calibration plates with high precision and various materials. Engineers and customer service can provide very complete services. Welcome to consult.