利用自开发软件，对图像进行灰度变换和直方图均衡化处理后，采用频域同态滤波的方法对图像进行降噪滤波处理。

After the gray transformation and the histogram equalization, these images were filtered by a frequency-domain homomorphic filter, hence noises in the images were greatly reduced.

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伊顿的软件主要用于分析液压系统的特点，优化降噪。

Eaton's software analyzes hydraulic system characteristics to optimize the noise reduction.

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