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面向水体的HY-1B/COCTS图像条带噪声去除

DOI: 10.6046/gtzyyg.2015.04.07, PP. 41-46

Keywords: HY-1B/COCTS,条带噪声,水体,矩匹配法,质量评价

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Abstract:

HY-1B/COCTS是我国自主研发的第2颗海洋卫星HY-1B星搭载的水色水温扫描仪(Chineseoceancolorandtemperaturescanner,COCTS)。由于COCTS的不同探测器对地物光谱响应有差异,其图像的行间存在明暗的条带噪声。针对COCTS图像在水色遥感中的应用特点,在分析可见光-近红外波段地物光谱特征的基础上,使用其第4和第8波段数据构建的归一化差分水体指数(normalizeddifferencewaterindex,NDWI)提取图像的水体信息;采用矩匹配法对COCTS图像水体区域的条带噪声进行去除,并以均值、标准差、信噪比、偏度、峰度、信息熵和平均梯度7个指标对条带噪声去除后的COCTS图像进行质量评价。结果表明,该方法能有效消除图像的条带噪声,使图像质量得到改善。

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