Barrel distortion(桶形畸变)是一种成像画面呈桶形膨胀的畸变现象，通常在广角镜头下出现。最近在调试生态监测相机时就遇到了非常典型的桶形畸变，会影响到对于监测对象的定位精确性。

Barrel distortion: When straight lines are curved inwards in a shape of a barrel, this type of aberration is called “barrel distortion”. Commonly seen on wide angle lenses, barrel distortion happens because the field of view of the lens is much wider than the size of the image sensor and hence it needs to be “squeezed” to fit. As a result, straight lines are visibly curved inwards, especially towards the extreme edges of the frame.1

$$\therefore ~\tan{\left(K\cdot\sqrt{x_{1d}^2+y_{1d}^2}\right)}=\frac{\sqrt{x_1^2+y_1^2}}{h}.$$

📷之后有时间的话，希望能够写成代码检验一下这个算法的适用性🐶

1. Mansurov, N. (July 5, 2020). What is Lens Distortion? photography life. Retrieved on Nov 16, 2022. Link ↩︎