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1.发明授权
公开(公告)号：US5694142A
公开(公告)日：1997-12-02
申请号：US340783
申请日：1994-11-17
IPC分类号： A61B17/00 , A61B6/03 , A61B19/00 , G06F3/00 , G06F3/01 , G06F19/00 , G06T1/00 , G06T17/40 , G09G5/00
CPC分类号： G06F3/013 , A61B90/36 , G06F19/321 , G06F19/3437 , G06F19/3481 , A61B2090/365 , A61B2090/371 , A61B2090/372 , A61B2090/502 , G06F19/3406
摘要： An interactive three-dimensional (3D) pointing device for selecting points within a subject employs a tracking device which determines the position of the operator, a semi-transparent screen positioned by the operator and the subject and provides this information to a model workstation. The model workstation superimposes computer graphic images of internal structures of the subject on a the semi-transparent screen through which the operator is viewing the subject. The superimposed image is derived from image data either previously generated and stored or obtained with an imaging system. The images of the internal structures are registered with the operator's view of the external structures of the operator. The operator interactively views internal and external structures and the relation between them simultaneously, while moving the screen to select 3D target points at an image depth within the subject. Optionally other input devices may be used to identify current `target points` as selected points. The 3D points are then provided to an output device which utilizes them. Another embodiment employs stereoscopic viewing methods to provide 3D representations of the internal images superimposed on external structures to allow the operator to employ parallax to select 3D points.
摘要翻译： 用于选择对象内的点的交互式三维（3D）定点设备使用确定操作者的位置的跟踪设备，由操作员和被摄体定位的半透明屏幕，并将该信息提供给模型工作站。 模型工作站将被摄体的内部结构的计算机图形图像叠加在操作者正在观看主体的半透明屏幕上。 叠加的图像从先前生成并存储或获得成像系统的图像数据导出。 内部结构的图像以操作员对操作者的外部结构的视图进行记录。 操作者在移动屏幕的同时在内部和外部结构以及它们之间的关系上交互地观察在主体内的图像深度处选择3D目标点。 可选地，可以使用其他输入设备来将当前的“目标点”识别为所选择的点。 然后将3D点提供给利用它们的输出装置。 另一实施例采用立体观看方法来提供叠加在外部结构上的内部图像的3D表示，以允许操作者使用视差来选择3D点。
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公开(公告)号：US5835994A
公开(公告)日：1998-11-10
申请号：US269928
申请日：1994-06-30
申请人： William John Adams
发明人： William John Adams
CPC分类号： G05F3/262
摘要： A current mirror employs a voltage drop means in the input current path to set the voltage difference between the gates of the mirror driving FET and the mirror cascode FET. In cases where the voltage difference is chosen to be less than the voltage drop across a diode-connected FET, the current mirror will permit an increased output voltage swing relative to that permitted by a prior art cascode current mirror.
摘要翻译： 电流镜在输入电流路径中使用电压降装置来设置反射驱动FET和反射镜共源共栅FET的栅极之间的电压差。 在电压差选择为小于二极管连接的FET上的电压降的情况下，电流镜将允许相对于现有技术的共源共栅电流镜允许的输出电压摆幅增加。
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