A ring Re, (M) iff each nonzero homomorphic image of R either contains a nonzero M-ideal or has an essential ideal.

一个环R∈（M）当且仅当R的每一个非零同态象或者包含一个非零M理想或者有本质理想。

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Image preprocessing: the image is processed by several algorithms including gray level stretch, homomorphic processing and image smoothing, and then the quality of image gets better.

图像预处理：采用灰度变换、同态滤波和平滑等方法对图像进行处理，提高了图像的质量。

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In this paper, multiplication model of speckle image in imaging lidar is analyzed, and then suppression processing for the speckle image is finished by homomorphic wavelet filter.

分析了激光成像雷达系统中所成的散斑像的乘法模型 ，并在此基础上利用一基于小波的同态滤波器对被散斑污染的图像进行了消噪处理。

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