Cloud Radiation Image Analysis And Processing

Clouds were mainly described in this thesis. Firstly radiation characteristic of the blocky clouds were theoretically talked about, and some conclusions were got. Secondly in order to prepare for researching clouds' radiation luminance characteristic with real sky pictures, experiments were combined with image processing, and a suit of method was got to deal with clouds pictures.The main research results were as follow:(1) Accorded to the blocky clouds' characteristic, Monte-Carlo and d-Eddington approximate methods were used to solve the three-dimensional radiation transfers equation of the blocky cloud. When using Monte-Carlo method, every side of cubic clouds' downward and upward radiation characteristic was got. When using d-Eddington method, isolate clouds' reflectivity changed with thickness, horizontal size and the sun day vertex angle were got.(2) A suit of experimental facilities was set up to get sky images. The camera (IstDL type) and the lens (55mm-200mm) were used to get sky image at the same time, same place and same position every day.(3) A suit of method was set up to deal with sky images (cloud images), including turning into grey image, image compression, drawing image grey histogram, comparing with two images' grey value, getting image relevant length, drawing image's three-dimension of grey level etc. In these methods, useful information was got for researching cloud radiation luminance.(4) Image process's results were used, and three schemes were put forward to simulate cloud, including relevant length method, grey superpose method and fractal method. Accorded to the questions that we met in simulating clouds, every method's advantage, disadvantage and every method's feasibility were pointed out.(5) On the basis of clouds radiation luminance, fractal method was used to simulate clouds. And fractal interpolation method was used to simulate sky scene with clouds.