Method and device for digital image restoration

A method for restoring a digital image, the digital image to be restored being derived from an initial image acquired by an image acquisition device having an associated acquisition instrumental noise, the method including the steps of:

• obtaining an intermediate digital image with restitution of the associated acquisition instrumental noise;
• denoising the intermediate digital image to obtain a denoised intermediate digital image;
• and
• deconvoluting the denoised intermediate digital image to obtain a restored digital image, wherein the step of obtaining an intermediate digital image comprises sub-steps of:
• obtaining, by applying a transformation called compression transformation, of a representation of the digital image to be restored by a plurality of coefficient blocks, each coefficients block of the plurality of coefficient blocks corresponding to a pixels block of the digital image to be restored;
• for at least one processed coefficient of a coefficients block:
• calculating a noise threshold as a function of a value representative of an image acquisition instrumental noise model;
• comparing an absolute value of the at least one processed coefficient to the noise threshold;
• and
• when the absolute value of the at least one processed coefficient is higher than or equal to the noise threshold, the at least one processed coefficient is left unchanged,
• when the absolute value of the at least one processed coefficient is lower than the noise threshold, replacing the absolute value of the at least one processed coefficient with a noise value depending on the value representative of the image acquisition noise model.