全景视觉是计算机视觉领域中的关键技术之一, 而投影模型在全景技术中又起到了非常重要的作用。为了减少柱面投影带来的水平直线畸变以及保证不同摄像机之间图像接合处的平滑性, 本文针对多摄像机全景系统提出了基于柱面的多平面全景投影技术, 该技术首先通过对每个摄像机图像平面做柱面投影来实现柱面全景图像。然后在根据柱面全景中的内容进行水平二次划分为几个子图像。最后, 对划分后的子图像再按照反柱面投影模型进行一次多平面投影就得到水平直线畸变较小的全景图像。实验结果表明该方法校正后的全景图像中水平直线的曲率不大于0.002, 同时还保证了不同图像平面接合处的平滑性。

Panorama vision is one of crucial technologies in computer vision, and the selection of projection model plays an important role in panorama. In order to decrease the horizontal line distortion which cylinder projection brings and make conjunction between different camera-images more smooth, a multi-plane projection technology based on cylinder projection is proposed for multi-camera panorama system. Firstly, the cylinder panorama image is constructed by cylinder projection. Then cylinder panorama is divided into several sub-images horizontally by image content. At last, all sub-images are projected by anti-cylinder projection and the horizontal line distortion in the final panorama is decreased. Experiments show that the projection method can improve the horizontal line curvature to no more than 0.002, meantime ensure the smoothness between two different image planes.