摘要
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 of the sky near the ground is analyzed statistically.The mean of gray level, variance, horizontal and vertical scanning line, histogram of long-wave(8～12 μm)infrared images of the sky near the ground are analyzed. The images consist of 100% sunny, 100% cloudy, cloudy and night. Result about the analysis is also given. The relation between gray level mean and atmospheric temperature is linear. The variance of 100% cloudy sky image is small. Gray level linearly changes in vertical scanning line and keeps stable in horizontal scanning line. The histogram of image depends on the weather and time.
出处
《红外与激光工程》
EI
CSCD
北大核心
2003年第6期610-612,共3页
Infrared and Laser Engineering
关键词
长波红外
红外图像
统计分析
直方图
Long-wave infrared
Infrared image
Statistical analysis
Histogram
