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本文提出了超广角井下电视系统视场角的概念及标定，以及利用该电视系统对井内落物尺寸进行精确测量的方法。文中对误差产生的原因进行了分析。
This paper presents the concept and calibration of the field of view of the ultra-wide-angle downhole television system and the method of accurately measuring the size of fallen objects in the well using the television system. The paper analyzes the causes of error.