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 . <EOS>