Deducing 3-d spatial image parameters according to 2-d section or the image parameters on projecting plane. the required feature informations are extracted and processed.
根据二维截面或投影面上的图象参数去推断三维的空间图象参数，提取需要的特征信息并自动地进行处理及输出特征参数值。
The projecting lines are discussed by using the line of intersection in horizontal ( H ) plane, profile ( W ) plane and frontal ( V ) plane.
并讨论相贯线在水平（H）面，侧立（W）面，正立（V）面上的投影线。
The optical indicator is used for projecting the external curser onto the imaging plane.
光学指示器用于将外部光标投影于显像平面上。
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