不同天气条件下户外场景图像生成方法研究

大气介质和天气条件的变化使户外场景图像的生成相当复杂。文中分析了不同天气情况下大气介质对成像的影响，给出了由天气参数：拍摄时间、日出、日落时间、温度、风速、相对湿度、太阳照度等计算湍流大气调制传递函数MTEsc，由能见距离和光程计算气溶胶调制传递函数MTFa的方法，由两者的乘积得出总的大气传递数MTF，再利用大气传输理论，由总调制传递函数生成不同天气条件下的图像；文中还给出了图像生成的具体流程。实验表明：模拟生成的图像与实际拍摄的图像非常接近，获得了满意的实验结果。

Research on out-door scene image generation approach under different weathers

Different kinds of atmospheric media and variation of weather conditions make the generation of out-door scene image specially complex. In this paper, the influence of atmospheric media in different weathers on imaging for out-door scene is analyzed firstly. Then the formulas for MTF\-\{se\} by sensed time, sunrise time, sunset time, temperature, wind speed, relative humidity, solar flux and the formulas for MTF\-a by visibility distance, path length are given. The overall MTF is the product of MTF\-\{se\} and MTF\-a. Furthermore, the method of synthesizing image by MTF and the schemetic flow of image generation are presented. Finally, the simulated images are compared with the gray level ones captured in different weathers in our experiment, and the results are promising.