Spectral enhancement includes linear contrast stretch, non-linear contrast stretch, histogram equalization and histogram matching etc.
光谱增强包括线性反差拉伸、非线性反差拉伸、直方图均衡化和直方图匹配等方法。
The targets SNR(Signal Noise Ratio)and contrast are very low when the target is in the sea background in which there are sea waves and the reflexing light from the stretch welter.
海面背景下海面及连绵起伏的波浪反光使图像的信噪比和对比度都较低，而且舰船目标像素较少。
The targets SNRand contrast are very low when the target is in the sea background in which there are sea waves and the reflexing light from the stretch welter.
海面背景下海面及连绵起伏的波浪反光使图像的信噪比和对比度都较低，而且舰船目标像素较少。
The long stretch of foreign concessions frequented by thousands of merchants on one side of the Huangpu River and the vast patch of natural crops on the other side formed a striking contrast.
浦江两岸形成了一边是外商云集的十里洋场，一边是以自然农作物为主的大片农田的鲜明对照。
The long stretch of foreign concessions frequented by thousands of merchants on one side of the Huangpu River and the vast patch of natural crops on the other side formed a striking contrast.
浦江两岸形成了一边是外商云集的十里洋场，一边是以自然农作物为主的大片农田的鲜明对照。
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