There are three aspects concern with this study:Firstly, the semiotic characteristic of Single-outline Flat-color image and separated visual elements;
这部分的研究主要从三个方面展开：一是单线平涂图像构成元素的符号性及整体图像的符号性；
Since viewpoint correction only works on flat surfaces, any image which is viewpoint corrected must only have control points placed on a single flat surface.
由于观点修正只能在平坦的表面，任何形象，是纠正必须只能有控制点放在一个平坦的表面。
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