Stereo cameras have been widely used for three-dimensional (3D) imaging, and their performances are highly depended on the calibration accuracy. This paper presents a marked-crossed fringe pattern for the calibration of stereo cameras. Some coded markers are also encoded into the crossed fringe pattern, and the feature points are encoded into the carried phase. Two wrapped phase maps are recovered by using the Fourier transform, and the markers are extracted and decoded for absolute phase unwrapping. Referring to the absolute phase values, the one-to-one mapping between the world points and the image points can be established to calibrate the stereo cameras. Compared with the traditional method, the proposed method adopts global coding, which can flexibly select any part of the feature points for calibration and obtain high-precision camera parameters. Simulations and experiments show the effectiveness of the method.

立体相机已广泛用于三维（3D）成像，其性能高度依赖于校准精度。本文提出了一种用于标定立体相机的标记交叉条纹图案。一些编码标记也被编码到交叉条纹图案中，特征点被编码到携带相位中。使用傅立叶变换恢复两个缠绕的相位图，提取和解码标记以进行绝对相位解缠。参考绝对相位值，可以建立世界点和图像点之间的一对一映射来校准立体相机。与传统方法相比，本文提出的方法采用全局编码，可以灵活选择任意部分特征点进行标定，获取高精度的相机参数。仿真和实验表明了该方法的有效性。