Patent ID: 6212285
Filing Date: 2001-04-03
Classification: G06T,H04N

Abstract:
A method of embedding information comprising a plurality of bits in a host image comprised of points, each point having a parameter value, the method comprising the steps of:a. defining a plurality of discrete zones within the image, each zone comprising a plurality of points;b. generating an ordered series of pseudo-random numbers for each bit to be embedded;c. assigning each pseudo-random number of each series to a first or a second group;d. for each series, within a single zone, associating each pseudo-random number with a point;e. designating each point associated with a pseudo-random number assigned to the first group to be a first point and designating each point associated with a pseudo-random number assigned to the second group to be a second point; andf. creating an altered host image by performing, within each zone, operations comprising:i. increasing the parameter value of at least some first points and of a first patch of points surrounding each of the at least some first points andii. decreasing the parameter value of at least some second points and of a second patch of points surrounding each of the at least some second points, thereby embedding within the zone information comprising a bit for each series of pseudo-random numbers, such that the information embedded in all zones contains identical embedded information.