Effectively suppresses low to high frequency noises.
有效地抑制低频率到高频率的噪声。
It divides the useful region twice and effectively suppresses the rotate distortion when the image was taken.
对有效虹膜区域进行两次划分，有效的抑制了采集图像时旋转失真的影响。
So the method of rotating diffuser effectively suppresses laser speckle, which has simple optical structure and is easy to implement.
证明了旋转散射片的方法能有效减少复合散斑，具有光学结构简单、实施性强等优点。
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