基于数码体视显微镜的微小物体三维重建

New Micro Object Reconstruction Method Based on Digital Stereo Microscope

将显微双目系统看作一个整体,提出了基于极线校正的体视显微镜三维重建方法.根据平行双目成像原理建立简易的三维重建模型,实现了对实验物体的三维坐标恢复.首先,采用近似欧式极线校正算法校正原始拍摄立体标定图像,并只需标定2个三维重建参数;然后用非局部代价聚合匹配算法匹配立体图像得到视差值;最后根据立体成像几何法得到物体三维重建坐标.实验结果表明：X和Y方向测量误差为3%,Z方向测量误差为3.2%~9.1%,故在允许误差下可用于测量微小物体的三维尺寸.

Due to the difficult and cumbersome camera parameter calibration process in stereo microscopic image reconstruction and the vertical displacement in camera＇s imaging of the same object caused by small deviation of actual stereo microscope＇s parallel optic path, a new three-dimensional reconstruction method for stereo microscopic image is proposed in this paper, where epipolar rectification is used by regarding microscope binocular system as a whole. The proposed method uses three-dimensional reconstruction model to recover three-dimensional coordinates of test object with considering the characteristics of parallel binocular imaging principle. To obtain rectified stereo images and calibrate two three-dimension reconstruction parameters, Quasi-Euclidean epipolar rectification algorithm is utilized into original stereo image. Then, disparity map is obtained by using non-local cost aggregation matching algorithm on rectified stereo image. Finally, according to three-dimensional imaging geometry technique, the coordinates of three-dimension reconstruction are recovered. Experimental results show that for the proposed method, its measurement error in the directions X and Y is about 3% and while one in the direction Z is 3.2%-9.1%, which indicates that the proposed method can be used to measure three-dimensional size of micro object within tolerance error.