Title:
HIDING IMAGES IN HALFTONE PICTURES
Document Type and Number:
WIPO Patent Application WO2002043000
Kind Code:
A3
Abstract:
A method for hiding at least one pattern within a visible representation of the other different pattern is presented. The method is carried out by an encoding device and consists of selecting a predetermined key function, and utilizing this function to cerate a binary halftone representation of the visible pattern, in which said at least one pattern is hidden. This halftone representation is such that each cell therein has halftone dots' position distribution corresponding to the gray-level distribution of the at least one hidden pattern. By processing the binary halftone representation by a two-dimensional spatial correlator based on the key function, data representative of the at least one hidden pattern can be extracted.
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Inventors:
ROSEN JOSEPH (IL)
Application Number:
PCT/IB2001/002194
Publication Date:
July 25, 2002
Filing Date:
November 21, 2001
Export Citation:
Assignee:
S H HI START LTD (IL)
ROSEN JOSEPH (IL)
ROSEN JOSEPH (IL)
International Classes:
G06T1/00; (IPC1-7): G06T1/00
Foreign References:
| US5734752A | 1998-03-31 | |||
| US5790703A | 1998-08-04 | |||
| US6088123A | 2000-07-11 |
Other References:
BAHARAV Z ET AL: "WATERMARKING OF DITHER HALFTONED IMAGES", PROCEEDINGS OF THE SPIE, SPIE, BELLINGHAM, VA, US, vol. 3657, 25 January 1999 (1999-01-25), pages 307 - 316, XP000949151
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