An air chamber simulation method for scattering ambient foggy images in underground coal mines
In underground mining environment,surveillance images are subject to fogging degradation because of dust scattering and it is difficult to conduct environmentally controlled experiments in situ for fogging and defogging investigation.Therefore,we define the degree of image fogging using the relative average gradient,analyze the composition of the dust particle sizes in the mine,propose the method for compose experiment powder to simulate different mining dust,and design and build an air chamber to simulate the mining scattering environment.The results indicate that:Firstly,the degree of fogging defined by the average gradient is better than other commonly used evaluation parameters and its evaluation results are consistent with the human eye perception;the degree of fogging of underground mining images can reach 80%,when the image details merge in the foggy blurring effect.Secondly,with microscopic observation method,99%of underground mining dust has particle size less than 30 μm and the proportion with the particle size less than 10 μm is about 93%.Thirdly,the foggy image generated from the simulated air chamber not only covers the range of the image fogging degree of real mining surveillance images,but also shows the diffusion effect of light scattering,which is more consistent with real surveillance images compared with computer-based fogging algorithm,proving the advantage of the air chamber method.
万方数据
维普
