Since we now have television and sonar, we are able to examine the bottom of the sea quite well.

由于我们现在有电视和声纳，我们就能够很好地研究海洋底部了。

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In military engineering applications, identification of sea bottom types are vary important for match field location, low-frequency sonar distance forecast, and choosing the location for submarine.

军用方面，匹配场定位、低频远程声纳作用距离预报、潜艇沉底隐蔽地点选择等方面都有广泛的应用。

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Side-scan sonar image (SSI) must be segmented into regions of shadow, sea-bottom-reverberation, and object-highlight before underwater object can automatically be detected and recognized.

为了利用侧扫声呐进行水下目标自动探测和识别，首先必须将声呐图像分为目标高亮区、海底混响区和目标阴影区。

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