光轴外扩式布置的双目相机图像立体校正

摘要： 针对宽视野光轴外扩式布置双目图像采集和显示系统的图像立体校正问题，利用三维重建误差，提出了一种基于双目图像视差特性的立体校正方法.在分析光轴外扩式布置双目相机图像视差特性的基础上，针对相机光心与显示投影中心间的位置误差和相机光轴与显示视轴间的角度误差，建立图像仿射变换、水平视差畸变和垂直视差的校正函数，利用一组空间采样点的三维重投影误差作为目标函数通过优化方法求解校正参数.仿真实验表明：在视轴外扩夹角为30°时，本方法可以有效地消除光心位置误差和光轴角度误差对图像视差造成的影响.真实图像校正实验表明：校正后的图像水平畸变小，在显示宽视野双目图像时，能保持正确的三维立体感.
关键词：中图分类号：文献标志码： A

Stereo Correction of Binocular Images with Optical Axes Divergent Arrangement

Abstract： The traditional stereo correction method based on epipolar geometry is difficult to apply to the binocular imaging and display system with optical axes divergent arrangement for wide field of view. To address this problem, using 3D reconstruction error, a stereo image correction method was proposed based on the disparity characteristics of the binocular images. First, the features of horizontal and vertical disparity of the images captured by binocular imaging system with divergent optical axes was analyzed. Then, based on these characteristics, a pair of affine transformation was proposed for the position error between the optical centers of the binocular cameras and the corresponding projection centers of the wide vision HMD(Head Mounted Display), and two functions of horizontal disparity distortion correction and vertical disparity correction were proposed for the angular deviation between the optical axes of binocular cameras and the corresponding visual axes of the wide vision HMD. Finally, the stereo correction parameters were calculated using the optimization solution with 3D re projection errors of a set of 3D spatial points. Simulation results show that this method can effectively eliminate the effects on the stereo disparity of the binocular images caused by the position error of optical center and the angular deviation of optical axes when the divergent angle of visual axes is up to 30 °. Real image correction experiment results show that the corrected images have small horizontal distortion, and can provide correct 3D senses with a wide field of view.
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