Image analysis – Applications
Reexamination Certificate
2006-04-18
2006-04-18
Ahmed, Samir (Department: 2623)
Image analysis
Applications
C713S176000
Reexamination Certificate
active
07031491
ABSTRACT:
A method of determining a partition into distinct regions of a set of coefficients representative of at least a part of an image in order to insert a watermark comprises the following steps:generation (E501) of a centred pseudo-random sequence (w) equal in size to the cardinal number (N) of the said set of coefficients, formed from centred pseudo-random sub-sequences;modulation (E502) of the said set of coefficients by the said centred pseudo-random sequence (w) in order to insert the same information bit on the said set of coefficients; andchecking (E504–E508), over each region, of a criterion of detectability of the information bit inserted by modulation.Use especially for determining an adaptative partition as a function of a criterion of detectability of an information bit inserted on each region.
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Donescu Ioana
Nguyen Eric
Onno Patrice
Ahmed Samir
Bhatnagar Anand
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