Patent ID: 8787612
Filing Date: 2014-07-22
Classification: G06F,G06T,H04N

Abstract:
1. A method of marking a copy of a series of images of a same size, wherein the copy is marked with a code that uniquely identifies the copy, the method performed via a device and comprising steps of: a) defining a grid of P separate numbered virtual fields so that the grid covers at least part of each image of the series; b) obtaining a random or pseudo-random value between 1 and P inclusive; c) marking M consecutive images in the series of images by placing a visible mark in the virtual field with a number corresponding to the random or pseudo-random value, and skipping N consecutive images in the series of images immediately following the M consecutive marked images; and iterating steps b) to c) at least once; wherein values of M and N vary according to a random, pseudo-random or other sequence.