空间仿射坐标系的平行投影问题在计算机图形识别、跟踪目标及三维实体重建中具有重要意义。
Parallel projection of the affine coordinate system has a significant impact on computer graphics recognition, object's tracking or solid model reconstruction.
实体是具有标识且您可以修改的对象，而这些结果将是无法更改和持久化的投影。
Entities are objects that have identity and that you can modify, whereas these results would be projections that cannot be changed and persisted.
然后再经模型重建和重投影，可获取实体在任意视点下的图像。
Then the image can be got in any viewpoint by modeling reconstruction and reprojection.
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