Abstract
According to the poor image quality of the surveillance systems in coal mine, an integrated image clarity method was presented which combined adaptive multi-level noise reduction median filter based on the direction in the spatial domain to denoise the image, with multi-wavelet transform to enhance the lowlight image quality in the transform domain. This integrated approach incorporates the benefits of spatial domain and transform domain noise reduction and enhancement. It can reduce the impulse noise effectively, while retaining good image detail in coal mines. Examples show that the integrated approach can greatly improve image clarity in coal mines which thereby can improve readability of the image, and this is of considerable value for coal mine safety monitoring.
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