在物理学中，物距就是指物体到透镜光心的距离。用英文字母u表示。对于透镜而言，通过光心且与光轴垂直的平面，即是物方主平面也是像方主平面重合。物距与像距存在共轭关系，物距越远，像距越近；相反，物距越近，像距越远。在进行光学计算时，严格地讲，物距应为被摄体平面与镜头前主面间的距离。
照相机聚焦精度检查仪是检校照相机物距刻度精度的专用仪器。
The inspection instrument of camera focus accuracy is specialized in surveying the camera focus accuracy.
利用物距、像距法测量薄透镜的焦度是几何光学中最常用的方法。
Measuring the focal lengths of thin lens by means of object distance and image distance is a commonly utilized method in geometric optics.
因此，提出了一种新的通过物距变化恢复景物全局深度信息的方法。
Therefore, in this paper, a novel Depth from Defocus (DFD) method is proposed to solve this problem.
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