A method to transmit a label between two images, characterized in that the method includes the following steps: providing a first image, the first image comprising several sets of connected points, each set being characterized by a label, providing a second image, from the second image, determining several sets of connected points, superimposing the two images to determine the common parts and non-common parts of the sets in the first and second image, giving each common part of the second image, the label of the set in the first image with which said part is common, giving each non-common part of the second image in contact with a single set of connected points in the first image, the label of said set, giving a new label to each non-common part of the second image not in contact with any set in the first image.