Refuge chamber image processing algorithm based on combination of median filter and time domain recursive noise reduction

摘要

To lower down the pepper salt noise and the impulse noise for the mine refuge chamber image as well as to reserve the image detail information, we propose the combined method of the median filtering and time domain recursive noise reduction. First, the median filtering method will be adopted to process the refuge chamber image; and then different filtering coefficients will respectively adopted to conduct time domain recursive noise reduction for the images processed by the median filtering. The results have shown that: the method combined with median filtering and time domain recursive noise reduction can remove the image noises and, meanwhile, it can relatively well reserve the detail information contained in the image as well as provide good visual effect; therefore, it is superior to the single median filtering method or the single time domain recursive noise reduction method, which has provided a new train of thought to improve emergency refuge system in coal mine.