Noisy images with a periodic structure can be cleared by utilizing optical periodic average method.
利用光学周期平均法能够清晰地描绘带有噪声的周期性图象。
The substructure method was introduced to set up mathematical model of finite periodic composite structure, to solve its wave equation, and to derive its time-average power flows.
采用子结构法，建立了有限周期复合结构的数学模型，求出了数学模型的波动解，并推导出模型的时间平均功率流。
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