Patent ID: 7515763
Filing Date: 2009-04-07
Classification: G06K,G06T

Abstract:
1. A method for denoising a noisy image, the method comprising: using a processor to perform the steps of: (a) transforming the noisy image using a wavelet transform with a plurality of levels to obtain a plurality of components; (b) for each point in the wavelet transform domain at each of the plurality of levels, calculating the magnitude from the two wavelet coefficients at the same position and same scale in the wavelet transform components from the plurality of components obtained in step (a); (c) for each of the plurality of levels, calculating a pointwise singularity strength from the magnitudes calculated in step (b) and classifying each wavelet coefficient into a class of irregular wavelet coefficients or into a class of edge-related and regular wavelet coefficients in accordance with the pointwise singularity strength; (d) performing a MMSE-based filtering on the edge-related and regular coefficients in a subplurality of the components; (e) for a second subplurality of the components, performing an MMSE-based filtering on the irregular wavelet coefficients and an FWM-based filtering for the edge-related and regular wavelet coefficients; and (f) performing an inverse wavelet transform to reconstruct the denoised image.