新的桶形畸变的点阵样板校正方法

摘要

为了校正广角镜头的桶形畸变,提出一种新的桶形畸变数字校正方法.它使用点阵样板校正的方法,根据畸变图和理想图中圆点的位置关系,得出畸变图像素在X轴和Y轴方向上的偏移量曲面,采用三次B插值函数对曲面插值；由曲面插值获取像素点的偏移量,对各像素进行坐标转换得到校正图像；然后对图像进行了双线性插值的灰度重建.仿真结果表明,该方法使图像的坐标位置和灰度都得到很好的校正.%In order to correct the barrel distortion of wide-angle lens, a new method for distortion correction for barrel distortion was proposed. Adopting the lattice model calibration method, according to the location relation of dots between distortion image and ideal figure, the offset surfaces in X-and Y-axis direction about distorted pixels were got. Then, the cubic B-spline interpolation function was adopted to interpolate the surface. Thus, the offsets of each pixel were obtained in the distorted image. Furthermore, the pixels shift was rectified to achieve an undistorted image by coordinate conversion. And then the bilinear interpolation was used to reconstruct the gray level of pixels. The simulation results show that the proposed method can make a good correction of the coordinate position and gray value.