Image analysis – Applications
Reexamination Certificate
2007-05-22
2007-05-22
Bella, Matthew C. (Department: 2624)
Image analysis
Applications
C382S250000, C380S201000
Reexamination Certificate
active
10400581
ABSTRACT:
A local phase filter (315) for pre-processing data (310) including a watermark (320) is disclosed. The data (310) is pre-processed before detecting the watermark by correlation of the data (310) with the watermark (320). The local phase filter (315) starts by dividing the data (310) into a set of smaller sub-spaces. The frequency coefficients of the data contained in each sub-space are then computed, and the frequency amplitudes of the frequency coefficients are then spectrally shaped. Preferably, the amplitudes of the frequency coefficients of the sub-space are set to a predetermined function. Finally, filtered watermarked data is formed, having the same size as that of the data (310), by adding the filtered data of each sub-space together in the sub-space's original position.
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Azarian Seyed
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
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