1. A method for processing an image acquired by means of a guide consisting of a plurality of optical fibres, comprising: for each optical fibre, isolating a zone corresponding to the optical fibre on the acquired image, wherein each zone is locally processed individually by: calculating a flux for each zone on the acquired image, calculating a flux for each of a plurality of zones on a set of reference images comprising a parasite background image and an adjustment image, and calibrating the fluxes of the acquired image using the fluxes of the set of reference images; and reconstructing the acquired image from the calibrated fluxes of the acquired image so as to eliminate a pattern due to the optical fibres.