Abstract: The present invention relates to a computer-implemented method for classification of a picture to be analyzed, by attribution of a grade thereto, comprising: a) determining the distance between the picture to be analyzed and pictures from a database of graded pictures; b) selecting from within the database of graded pictures a predetermined number of the closest neighboring pictures or neighboring pictures which are at a distance from the picture to be analyzed below a threshold; c) determining the mean of the grades of the selected neighboring pictures; d) attributing the mean grade to the picture to be analyzed; and e) displaying the mean grade attributed to the picture to be analyzed on an output device.