Abstract
Removal model based on local variance normalized can remove noise significantly in flat area but slowly and maintains the texture details poorly. Therefore,global variance normalized was proposed to measure spatial detail,and then a new diffusion coefficient was given. New removal model used the new diffusion coefficient to accelerate denoising and then used the old diffusion coefficient to remove the uneven and black dots. Experimental results show that new model not only removes noise quickly and effectively while protecting texture details better,and the SNR and PSNR are slightly higher than the model with only one diffusion coefficient.
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