The contents in the paper include acoustic image preprocessing, feature extraction of texture and shape, and classifier design.

内容涉及声图像的预处理、纹理和形状特征的提取，以及分类器的设计等。

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The image fractal dimension feature describes the complexity and the roughness of texture.

图像的分数维特征描述了纹理的复杂度和粗糙度。

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The description and extraction of SAR image texture feature is important to texture segmentation.

SAR图像纹理特征的描述和提取是纹理分割的关键。

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