一种基于图像单应性矩阵的投影仪标定方法

A calibration method of projector based on the homography between the images

投影仪标定是计算机视觉的关键技术之一,针对实际应用中摄像机和投影仪相对位置关系,提出一种基于摄像机和投影仪图像单应性矩阵的投影仪标定方法.对捕获的图像进行背景差分、特征点提取等操作得到投影图像和摄像机图像之间的单应性矩阵,进而获得投影仪参数矩阵,完成投影仪标定.经实验论证,该方法操作简单,反投影像素误差在0.3到1个像素之间,证明了该方法的有效性.

Projector calibration is one of the key technologies in computer vision.This paper presented a calibration method of projector based on the positional relationship between the camera and projector. The method established the relation which was one to one correspondence of pixels between the image of the camera and projector image.The projector calibration was completed when getting homography between the projected image and the camera image by a series of operations to the captured image such as background subtraction,feature points extraction and so on.The method was simple and the experimental results indicated the method was practical,since the back projection error was between 0.3to 1pixel units.