Method for imaging a body part of a user according to a predetermined positioning instruction by means of a system comprising a computer and an electronic device comprising a video-capturing device able to acquire images of said body part of the user and a display screen, the method comprising the following steps: - a first step of acquiring, by means of the video-capturing device, a first image containing said body part of the user, - a step of characterizing, in said first image, by means of the computer, a first position of the body part of the user, - a step of determining, by means of the computer, a second position of said body part of the user different from the first position, - a processing step in which the computer retrieves a video stream of images acquired by the video-capturing device and containing said body part, generates modified images as the images of said video stream are acquired by modifying, in the acquired images, the positioning of the body part, with a view to displaying, on the display screen, doctored video feedback corresponding to said modified images, so as to engender a self-correction by the user of the positioning of said body part according to said predetermined positioning instruction, the modification of the images being such that a position of said body part according to said predetermined positioning instruction on the display screen corresponds to a position of the body part according to said second position in an image acquired by the video-capturing device, and so that the movement of the body part in the doctored video feedback is consistent with the change in positioning of the body part in the acquired images, a movement of the body part with respect to the electronic device in a direction engendering a movement of the body part in the same direction in the doctored video feedback, - a second step of acquiring, by means of the video-capturing device, a second image containing said body part of the user, during the processing step. - a first step of acquiring, by means of the video-capturing device, a first image containing said body part of the user, - a step of characterizing, in said first image, by means of the computer, a first position of the body part of the user, - a step of determining, by means of the computer, a second position of said body part of the user different from the first position, - a processing step in which the computer retrieves a video stream of images acquired by the video-capturing device and containing said body part, generates modified images as the images of said video stream are acquired by modifying, in the acquired images, the positioning of the body part, with a view to displaying, on the display screen, doctored video feedback corresponding to said modified images, so as to engender a self-correction by the user of the positioning of said body part according to said predetermined positioning instruction, the modification of the images being such that a position of said body part according to said predetermined positioning instruction on the display screen corresponds to a position of the body part according to said second position in an image acquired by the video-capturing device, and so that the movement of the body part in the doctored video feedback is consistent with the change in positioning of the body part in the acquired images, a movement of the body part with respect to the electronic device in a direction engendering a movement of the body part in the same direction in the doctored video feedback, - a second step of acquiring, by means of the video-capturing device, a second image containing said body part of the user, during the processing step.