The methods of generating and displaying tomograms on the depth indicated by glances for the computer assisted surgery system.

针对患者体表存在重叠断层图像的手术辅助系统，研究了在指定深度上快速生成断层图像和根据眼睛扫视计算深度的方法。其基本思想是，生成图像的深度与物体图像的视差之间存在数学关系，即相同深度处的物体在辐射图像上具有相同的视差。这个想法导致简单的算法，以将图像移位到与所指示的深度处的视差对应的位置，并将移位后的图像添加到标准图像。该方法一般在计算机上运行，如图像处理单元。第二，开发了根据操作者的眼睛选择要显示在头戴设备上的图像的方法。扫视参数是从检测眼睛虹膜的装置获得的，然后，由操作者指示的图像深度可以被计算。在计算过程中，采用新的方法消除了影响计算准确性的眼睛轻微运动，从而得到了眼睛的主要运动。开发的系统是由几台个人计算机构成的，这意味着，即使在狭窄的房间里也可以设置该系统。

For the operation assistant system with overlapping tomograms on the body of a patient, the methods of generating tomograms fast on the indicated depth and calculating the depth from eyes'glances are developed.First, the fast and convenient method of generating tomograms is developed. The basic idea is that a mathematical relation exists between the depth of the generated image and the disparity of object images, that is, the objects at the same depth has the same disparity on the radiated images. This idea leads to the simple algorithm to shift an image to the position corresponding to the disparity at the indicated depth and add the shifted image to the standard image. This method generally runs on a such computer as the image processing unit.Second, the method is developed to select the image to be displayd on the Head Mounting Device according to the operato's eyes. The glance parameters are obtained from the device detecting the irises of the eyes and, then, the image depth indicated by the operator ca be calculated. On the calculation, the new method is applied to eliminating a slight movement of eyes that gives a bad influence to the accuracy of computation and the main movement of eyes can be obtained. The developed system is constructed from a few personal computers, that means, this system can be set even in a narrow room.