Global patent index - EP 0985313 A1

EP 0985313 A1 2000-03-15 - METHOD FOR HIDING BINARY DATA IN A DIGITAL IMAGE

Title (en)

METHOD FOR HIDING BINARY DATA IN A DIGITAL IMAGE

Title (de)

VERFAHREN ZUM VERSTECKEN VON BINÄREN DATEN IN EINEM DIGITALEN BILD

Title (fr)

PROCEDE DE DISSIMULATION D'INFORMATIONS BINAIRES DANS UNE IMAGE NUMERIQUE

Publication

EP 0985313 A1 (FR)

Application

EP 99938027 A

Priority

  • FR 9900485 W
  • FR 9804083 A

Abstract (en)

[origin: FR2775812A1] The invention concerns a method for hiding a primary digital information (Iinf1) in an initial digital document, in particular an initial multimedia document (Iorig), characterised in that it consists in: first breaking down the initial document (Iorig), by determining a reference digital document (Iref) a function of the initial digital document (Iorig) in particular by a fractal method, and a secondary digital information (Iinf2) a function of the primary digital information to be hidden, such that the sum of the reference digital document (Iref) and said secondary digital information (Iinf2) is a substantially modified document (I'orig) equal to the initial digital document (Iorig); inserting the secondary digital information (Iinf2) thus determined in said initial document, by computing a modified image (I'orig) constituted by the sum of said reference digital document (Iref) and said secondary digital information (Iinf2)so as to obtain a modified digital document (I'orig) close to the initial document (Iorig) but integrating substantially indiscernible the primary digital information (Iinf1) to be hidden. Said method enables to retrieve digital information hidden in a multimedia document in a dual manner. Said method, based on the concept of auto-similarity, and ensures, under certain conditions, that the input information is not visible, prevents image manipulations, and can finally be retrieved without providing knowledge of the original documents.

IPC 1-7 (main, further and additional classification)

H04N 1/32

IPC 8 full level (invention and additional information)

G06T 1/00 (2006.01); H04N 1/32 (2006.01)

CPC (invention and additional information)

G06T 1/0028 (2013.01); H04N 1/32203 (2013.01); H04N 1/32208 (2013.01); H04N 1/32267 (2013.01); H04N 2201/3233 (2013.01); H04N 2201/327 (2013.01)

Citation (search report)

See references of WO 9945696A1

Designated contracting state (EPC)

DE ES FR GB GR IE IT

EPO simple patent family

FR 2775812 A1 19990910; EP 0985313 A1 20000315; US 6643383 B1 20031104; WO 9945696 A1 19990910

INPADOC legal status

2006-04-12 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20051001

2000-09-06 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION):

- Ref Legal Event Code: RBV

- Designated State(s): DE ES FR GB GR IE IT

2000-05-17 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000308

2000-03-15 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE ES FR GB GR IE IT