DWDM系统的传输质量受到线性和非线性两类效应引起的损害影响，导致光信号噪声比下降，误码率增大。
The transmission quality of DWDM system is affected by the damages from linear and nonlinear effects so the ratio of optical signal to noise is reduced and the bit error rate is increased.
然而，图像在采集和传输的过程中易受到各种噪声的干扰，图像的质量会受到不同程度的损害，这对图像后续更高层次的处理是十分不利的。
However, images are easy to be polluted by all kinds of noise in its acquisition or transmission, which degrades the quality of original images and has unfavorable influence on consequent processing.
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