Before revision:  We propose a new PnP scheme, based on the Half-Quadratic Splitting proximal algorithm, combining external and internal priors. Moreover, differently from other existing PnP methods, we propose a deep denoiser acting on the image gradient domain.
After revision:  We propose a new PnP scheme, based on the Half-Quadratic Splitting proximal algorithm, combining external and internal denoisers as priors, defined on the image gradient domain.