A plane pattern of equilateral - dodecagon based camera self - calibration 基于正十二边行平面模板的摄象机自标定
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Ancient chinese architecture uses a variety of shapes : the square , rectangle , triangle , hexagon , octagon , dodecagon , cross , circle , and semicircle 中国古代建筑采用多种不同的外形：正方形、长方形、三角形、六角形、八角形、十二角形、十字形、圆形和半圆形。
