Abstract: Aiming at underground mine light uneven, much noise was interfused in S3C6410 field information recorder during collection and transmission of image, the picture was fuzzy and contrast ratio was low. Noise source of this system collection port was analyzed, several classical wavelet threshold de-noising method were compared based on wavelet threshold de-noising theory proposed by Donoho, de-noising effect of peak signal noise ratio was obtained, image enhance method of adaptive wavelet threshold de-noising and histogram modification combination was proposed. The performance was good and the image quality was improved with noise removing from CCD camera.

Key words: Underground image, Noise detection, De-noising, Contrast ratio