由于激光照射下的水下图像含有大量的散斑噪声，严重影响图像的质量。
To recognize underwater target, extraction must be performed well because there is a lot of speckle noise in underwater laser images.
海杂波指雷达波束照射到海面上后引起的后向散射杂波，是海防预警雷达的主要噪声干扰。
Sea clutter is the backscatter from fluctuant sea surface. Sea clutter is the major noise interference of seaborne radar.
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