Light from a low Angle, but not so low that your subject is obscured by its own shadow.
请保持光源处在较低的角度，但也不要放的太低以至于你的主题因为处于自身的阴影而模糊不清。
2
Firstly, the learning ability of support vector machine is used to detect cloud in remote sensing image, and combining the information of solar Angle, cloud shadow area is detected.
The rule graph of cloud layer and shadow was generated by the detection of cloud layer and shadow using support vector machine and information of solar Angle.