By using calibrated image, it can measure plane absolute displacement of worktable automatically via feature point extraction and gray vector matching.
该方法采用事先通过标定的图像，对自然标志(特征点)的提取和基于灰度向量匹配来完成绝对位移的测量。
2
The other kind of feature points are those where the absolute value of the scalar product of its normal vector and the view vector is less than a threshold.