Method for processing a digital image

A method for processing a digital image B1, the image B1 being a convolution of an image F and a point spread function h, comprising removing noise from the image B1 so as to produce an image B′ of reduced noise, and calculating F based upon B′,

• wherein the amount of noise in an image is calculated using an algebraic expression involving the gradient of a function P(x) obtained by inverse Fourier transform of {tilde over (B)}(q)/{tilde over (h)}(q).

A method for processing a digital image B1, the image B1 being a convolution of an image F and a point spread function h, comprising removing noise from the image B1 so as to produce an image B′ of reduced noise, and calculating F based upon B′,

• wherein calculating F involves calculating an inverse Fourier transform of the algebraic expression {tilde over (B)}(q)/{tilde over (h)}(q). wherein {tilde over (B)}′(q)is the Fourier transform of the image B′ of reduced noise, and {tilde over (h)}(q)is the Fourier transform of h.

A method for processing a deconvoluted image B, the image B having been deconvoluted according to a deconvolution filter D, the method comprising reducing correlation between the image and the deconvolution filter,

• wherein an amount of correlation is calculated in a plurality of images P, and an image P′ is selected among the images P as an image having essentially minimal correlation with the deconvolution filter.

A method for obtaining a radius r of a point spread function h describing an out-of-focus distortion of a digital image B, the method comprising a step of calculating a gradient at a plurality of pixels in the image B, in which a radius r(x) is calculated at each of the plurality of pixels based upon the gradient.

A method for processing a digital image B1, the image B1 being a convolution of an image F and a point spread function h, comprising removing noise from the image B1 so as to produce an image B′ of reduced noise, and calculating F based upon B′,

• further comprising a step of producing the image B′ from an image B0, where the image B0 was obtained using a digital camera that applies a transformation to a light level detected at a pixel, the transformation having an inverse, wherein B1 is obtained from the image B0 by applying to the image B0 the inverse transformation.