文章还对坐标变换过程中的电磁功率不变性原则进行了讨论。
This paper also discusses the principle of the electromagnetic power unchangeableness to some extent.
用功率谱的方法对任意景物在空间频域进行分析表明，功率谱对于自然景物具有一定的不变性。
Different scenes are analyzed in the power spectrum spatial frequency domain, it can be shown that the power spectrum of most natural scenes is of invariability.
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