【摘要】 为了减小光电成像测量系统存在的非线性畸变,提高测量精度,提出了一种基于多项式变形法的栅格图像畸变校正方法。提取带有桶形畸变的栅格图像中的栅格交叉点作为控制点,利用光学成像关系推算出栅格交叉点的理想无畸变位置,构成控制点对。对畸变图像和校正后图像的像素位置对应关系建立线性方程组,通过最小二乘法实现两者像素之间的坐标变换,并且采用双线性插值法确定校正后栅格图像中像素的灰度值。对带有桶形畸变的栅格图像进行了畸变校正实验,结果表明,多项式变形法能够自动、有效地校正图像畸变。更多还原

【Abstract】 In order to decrease nonlinear distortion of electro-optical imaging measurement system,a distortion correction method based on polynomial warping method is proposed to improve measure precision. Cross points of the black lines can be found and regarded as control dots by image segmentation and thinning of a grid image with barrel distortion.According to imaging characteristic of an optical system,coordinates of cross points in an undistorted image can be calculated from ones in the distorted grid image. Based on relationships among pixel locations of the distorted image and undistorted image,linear equations can be set up. Coordinates transformation is performed by least-squares method. And intensity information of pixels can be computed by bilinear interpolation method. The proposed method is tested to correct the grid image with barrel distortion. Experimental results show that the proposed method can correct image distortion automatically and efficiently.更多还原