会聚式相机获取的视差图像的梯形失真校正

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筹图像来校正其他待校正视筹图像的方法.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止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.

Keystone Distortion Rectification of Parallax Images Captured by Toed-in Cameras

When stereoscopic images are shot, the parallax images captured by toed-in cameras produce keystone distortion which introduces unexpected vertical parallax and worsens the stereoscopic display effect. Based on the principle that the objects represented at a certain depth in stereoscopic display have same horizontal parallaxes and no vertical parallaxes, the left and right parallax images are rectified by regarding the central parallax image as a reference image. The rectification process is composed of two steps: one is building the coordinates relationship between the unrectified and rectified images using polynomial fitting and the other is sampling using bilinear interpolation. The experiments show that the method is reliable. And the research helps to improve stereoscopic display effect.