ShadowRecovery：恢复图像阴暗区域的信息。
ShadowRecovery: Recover image information in darked regions.
哪里二个阴暗的区域交叉的彼此我们有砖瓦的形状。
Where two shaded areas cross each other we have the shape of a tile.
下面的图像夸张的展现了这一情况。当然，阴暗的区域也可以用粗的线条。
The image below shows an exaggerated example of this. Also areas that fall into shade can have a heavier line.
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