会聚式相机获取的视差图像的梯形失真校正
Keystone Distortion Rectification of Parallax Images Captured by Toed-in Cameras
作者：王爱红(四川大学 电子信息学院)；王琼华(1.四川大学 电子信息学院，四川 成都 610065;2.四川大学 视觉合成图形图像技术重点学科实验室，四川 成都 610065)；李大海(四川大学 电子信息学院)；李小方(四川大学 电子信息学院)
Author：Wang Aihong(School of Electronics and Info. Eng., Sichuan Univ.)；Wang Qionghua(1.School of Electronics and Info. Eng., Sichuan Univ.,Chengdu 610065,China;2.State Key Lab. of Fundamental Sci. on Synthetic Vision,Sichuan Univ.,Chengdu 610065,China)；Li Dahai(School of Electronics and Info. Eng., Sichuan Univ.)；Li Xiaofang(School of Electronics and Info. Eng., Sichuan Univ.)
收稿日期：2010-01-22 年卷（期）页码：2011,43(2):72-75
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：垂直视差；梯形失真；会聚式相机；视差图像
Key words：vertical parallax;keystone distortion;toed-in cameras;parallax image
基金项目：国家自然科学基金资助项目(60877004)
中文摘要
为了消除会聚式相机所拍摄的视差图像中由于梯形失真引入的垂直视差，基于立体成像时同一深度的物点应具有同一水平视差且不存在垂直视差的原理，提出了在相机拍摄场景中的某一深度放置标定板并以中相机所拍摄的标定板图像作为参考视差图像来校正其他待校正视差图像的方法。以标定板特征点在待校正视差图像及参考视差图像中的坐标值建立待校正视差图像在校正前后的坐标映射关系，并通过图像采样得到校正后视差图像。实验结果表明,该方法有效地减小甚至消除了视差图像中的垂直视差，具有可行性，对提高立体显示效果具有指导意义。
英文摘要
Based on the principle that the objects represented at a certain depth in stereoscopic displays have the same horizontal parallax and no vertical parallax, a parallax image rectification method was proposed to eliminate the vertical parallax in the parallax images induced by keystone distortion in toed-in cameras. A calibration board was put in the scene at a certain depth and its central parallax image was regarded as a reference parallax image. According to the coordinate values of the feature points in the unrectified parallax image and the reference parallax image, the coordinate mapping relationship between the unrectified and the rectified parallax images was built up, and then the rectified parallax image was obtained by sampling. The experimental results showed that the method was reliable to reduce or even eliminate the vertical parallax of the parallax images and helpful to improve stereoscopic display effect.
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