Finally, scale space analysis method is used to refine each point in the coarse centerline in its cross-section plane. Thus, an accurate centerline is obtained.
最后，对该中心路径上的每一点，利用尺度空间分析法在其所在的管腔横截面内进行修正，最终得到一条精确的中心路径。
The image subtracting method and the point to arc projection extremum algorithm can derive the pointer and scale marks quickly, and separate the long and short graduation line.
基于差分图像确定投影原点的点弧线投影极值新算法，可快速获取仪表指针和分度线参数，且能区分分度线长短。
The principle, method, experiment facilities and result of the realization of the International Temperature Scale of 1990(ITS\|90) above silver freezing point at NIM are described.
叙述中国计量科学研究院复现我国银凝固点以上国际温标（ITS 90 ）的原理、方法、仪器设备、实验结果、温标不确定度评定以及参加国际关键比对的初步结果。
The principle, method, experiment facilities and result of the realization of the International Temperature Scale of 1990(ITS\|90) above silver freezing point at NIM are described.
叙述中国计量科学研究院复现我国银凝固点以上国际温标（ITS 90 ）的原理、方法、仪器设备、实验结果、温标不确定度评定以及参加国际关键比对的初步结果。
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