图像梯度修正是将图像梯度方向旋转到尽量与法向量在图像平面的投影反向一致的方向上。
The revision of the image gradient is to revolve it to the reverse direction of the normal vector's projection on the image plane.
将电动力方向与水动力方向一致的电场定义为正向电场，反之则为反向电场。
If the direction of the electrokinetic power is consistent with that of the hydraulic power, the electric field is defined as positive electric one, otherwise, as the negative electric field.
在产品的误差检验和反向工程中，为了实际测量的需要以及保证测量数据的一致性，用三坐标测量机进行测量之前必须建立相应的测量坐标系。
In order to ensure the coherence of the measuring data, measuring-coordinate system must be created firstly before the part is measured and checked by coordinate measuring Machine (CMM).
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