将小型双目立体视觉系统应用于小尺度测量,分析了CCD像素的不连续性对测量准确度的影响,探讨了系统结构参量基线距、焦距以及物距与测量误差之间的关系.当考虑像素不连续性时,视差值与测量距离之间呈阶梯状曲线关系,测量误差随基线距以及焦距的增大而减小,随物距的增大而增大.此外在实际测量中系统测量准确度达98.89%.该研究可为双目立体视觉小型系统的设计及搭建提供参考和指导.

A compact binocular stereo vision system was used for measurement in small scale. This paper analyzed the influence of CCD pixel discontinuity on the measurement accuracy and then built the relationship between structural parameters (baseline,focal length and object distance) and distance measurement errors. When considering the discontinuity of pixels,the relationship curve about measuring distance and disparity was of a stair-step shape. The measurement error decreased with the increase of the baseline and the focal length,while it gradually increased along with the object distance. The measurement accuracy of our system can reach 98.89%. Our valuable theory can be offered for optimization design of the binocular stereo vision system which is applied in small scale measurement.