他们的系统根据图像中的视觉编码来推导图像坐标到物体坐标的变换。
Their system induces the transformation between code coordinate system and image coordinate system with visual codes in the image.
假设物体和目标的世界坐标已知，那么广告牌技术将会是一个简单的几何操作。
Assuming that both the objects and target positions are known in world coordinates, then billboarding becomes a simple geometrical operation.
使用物体的局部，原始坐标。
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