OpenCVSharp UndistortPoints函数参数InputArray src怎么定义成一个点

public static void UndistortPoints(InputArray src, OutputArray dst, InputArray cameraMatrix, InputArray distCoeffs, InputArray r = null, InputArray p = null);

InputArray src怎么定义成某个像素点。

https://blog.csdn.net/xfortius/article/details/7748141