... 天空；天空状况 sky 天空背景噪音 sky background noise 天空亮[度]温[度] sky brightness temperature ...
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Infrared images for warship targets in sky -sea background have some characteristics, such as the low target-to-background contrast, great noise and so on.
海天背景下舰船目标红外图像的目标背景对比度低，噪声大。
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