Abstract: The invention concerns a method and a device for digital image restoration. The digital image to be restored comes from an initial image acquired by an image acquisition device having an associated acquisition instrumental noise. The method comprises the following steps: —obtaining (30) an intermediate digital image with restoration of the acquisition instrumental noise, —denoising (32) the intermediate digital image in order to obtain a denoised intermediate digital image, —deconvolution (34) of the denoised digital image in order to obtain a restored digital image.

Abstract: The invention concerns a method and a device for digital image restoration. The digital image to be restored comes from an initial image acquired by an image acquisition device having an associated acquisition instrumental noise. The method comprises the following steps: obtaining (30) an intermediate digital image with restoration of the acquisition instrumental noise, denoising (32) the intermediate digital image in order to obtain a denoised intermediate digital image, deconvolution (34) of the denoised digital image in order to obtain a restored digital image.

Abstract: The invention relates to a method and device for characterizing at least one optical aberration of an optical system of an image acquisition device, the optical system having an associated optical transfer function that is dependent on the aberrations, the image acquisition device being capable of acquiring at least two images in a field of image capture in a manner so as to introduce a differential aberration between the two images, each image being defined by a digital image signal. The method includes the obtaining (50) of a first image and a second image of a same given zone of the field of image capture, the second image being acquired with a differential aberration (?aberr) relative to the first image, each image acquisition having an associated optical transfer function.

Abstract: The invention relates to a method and device for characterising at least one optical aberration of an optical system of an image acquisition device, the optical system having an associated optical transfer function that is dependent on the aberrations, the image acquisition device being capable of acquiring at least two images in a field of image capture in a manner so as to introduce a differential aberration between the two images, each image being defined by a digital image signal. The method includes the obtaining (50) of a first image and a second image of a same given zone of the field of image capture, the second image being acquired with a differential aberration (?aberr) relative to the first image, each image acquisition having an associated optical transfer function.

Abstract: According to a first aspect, the invention relates to a method for calibrating alignment errors of a sight mark of an on-board imaging system inside an observation satellite, wherein a reference image of a scene is compared with a secondary image of the scene acquired by the imaging system, characterized in that the reference image and the secondary image consist of exposures of the scene acquired by the imaging system, the direction of motion of the observation satellite during the exposure of the secondary image being opposite to the direction of motion of the observation satellite during the exposure of the reference image.