Exponential nonlinear Volterra filters for contrast sharpening in noisy images. - Rui J. P. deFigueiredo; Sean C. Matz (ICASSP, 1996)

A Localized Nonlinear Method for the Contrast Enhancement of Images. - Sean C. Matz; Rui J. P. de Figueiredo (ICIP (3), 1999)

A nonlinear technique for image contrast enhancement and sharpening. - Sean C. Matz; Rui J. P. de Figueiredo (ISCAS (4), 1999)

Nonlinear Image Contrast Enhancement Based on Munsell's Scale. - Sean C. Matz; Rui J. P. de Figueiredo (ICASSP (2), 2006)

A nonlinear image contrast sharpening approach based on Munsell's scale. - Sean C. Matz; Rui J. P. de Figueiredo (IEEE Trans. Image Process., 2006)