运动的变换不是必须共面的， 也不必须是同心的。
The motion transformation is not necessary coplanar, nor must it be concentric.
分析空间四边平面加工过程中产生不共面的原因，提出了合理标注空间平面尺寸的方法并阐述了其理论根据。
The reason for noncoplane generated by space four latera during machining is analysed. The way for rational marking standard space plane dimensions and its theoretical bases are expounded.
利用棋盘格角点共面特点，将平面到平面的变换引入到角点检测中，实现了角点的自动粗定位。
Since X - corners coplanar, a plane - to - plane transform is introduced and rough location of X - corners is realized.
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