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对近地天空的红外图像特性进行了统计分析。具体分析了近地天空长波红外(8～12μm)图像在晴空、有云、阴天和晚上的均值、方差、水平和垂直扫描线、灰度直方图的规律。结果表明,天空图像灰度均值与大气温度成正比;阴天红外图像方差较小;图像垂直扫描线上灰度值呈线性变化;水平扫描线上图像灰度值基本不变;图像直方图的分布与拍摄天气和时间有关。
The infrared image characteristics of near-Earth sky were analyzed statistically. The regularity of average, variance, horizontal and vertical scanning lines and grayscale histograms of longwave infrared (8 ~ 12μm) near-Earth sky images in clear sky, cloudy, cloudy and evening are analyzed in detail. The results show that the average gray value of the sky image is proportional to the atmospheric temperature; the variance of the cloudy infrared image is small; the gray value of the vertical scanning line changes linearly; the gray value of the image on the horizontal scanning line is basically unchanged; Distribution and shooting weather and time.