关键词: 广角镜头, 畸变校正, 曲面插值, 图像处理, 桶形失真

Abstract: 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.

Key words: wide-angle lens, distortion correction, surface interpolation, image processing, barrel distortion