为提高版图电路提取效率，提出了一种新的层次式版图电路提取方法。
A new hierarchical approach for layout circuit extraction was presented to increase its efficiency.
由面阵CCD摄像机摄取刀形图像，通过硬件解调电路提取刀形轮廓数据并送入计算机。
The image of tool form is taken by a matrix CCD camera. The data of tool form are collected into PC through the hardware demodulation circuits.
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