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

针对患者体表层析图重叠的手术辅助系统，提出了在指示深度上快速生成层析图的方法和从眼睛的目光中计算层析图深度的方法。首先，提出了一种快速简便的层析成像方法。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，即相同深度的物体在辐射图像上具有相同的视差。这个想法导致了简单的算法将图像移动到与指定深度的视差相对应的位置，并将移动的图像添加到标准图像中。这种方法通常在像图像处理单元这样的计算机上运行。其次，根据操作者的眼睛选择显示在头戴设备上的图像。通过对人眼虹膜进行检测，得到人眼的扫视参数，进而计算出操作者指示的图像深度。在计算中，采用新方法消除了影响计算精度的轻微眼球运动，得到了眼部的主要运动。所开发的系统是由几台个人电脑组成的，这意味着即使在一个狭窄的房间里，这个系统也可以设置。

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.