如果你把闪光灯打到你旁边或身后的墙上，相对于拍摄主体来说，此时的光源面积要比直接将闪灯打到主体上要大的多。
If you bounce the flash off a wall to the side of you, or behind you, then the source of light relative to the subject, is much larger than if you had shot with the flash straight on.
在线光源软阴影生成算法的基础上，作者提出了运用快速面积估计生成面光源的软阴影的算法。
Based on an algorithm of soft shadows for linear light, the author purposed an algorithm of soft shadows for area light by area approximation.
本研究利用微控制器作为控制单元，结合LED光源和传感器设计研制了一种便携式叶面积仪。
In this research, the portable leaf area meter is designed by combining microcontroller with light source LED and light sensor.
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