物质有三态，空间有三维，而三角测量是我们寻找自己坐标的方式。
There are three states of matter, three dimensions. Triangulation is how we get our bearings.
改进的方法是将激光三角测量头装在三坐标机上以代替触针，从而实现了非接触测量，但此法仍然受到三坐标机本身的限制。
Now a laser triangle measuring device instead of test probe is installed on the three-coordinate measuring machine, but this method is still limited by the three-coordinate measuring machine itself.
对应特征点的三维重建是根据三角测量的方法计算其投影矩阵，然后用奇异值分解求出特征点的三维齐次坐标。
Feature points' 3d coordinates are computed through singular value decomposition of projector matrix, then compute projector matrix by triangulation.
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