中文说明：输入控制点对，即可得到畸变校正系数。此例中使用最近临插值。如要得到更好效果，可换用双线性或3次插值。
English Description：
The distortion correction coefficient can be obtained by inputting control point pairs. In this example, nearest neighbor interpolation is used. For better results, bilinear interpolation or cubic interpolation can be used.