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Abstract

A method for inserting a watermark signal into data to be watermarked. The method includes the steps of: applying a partial watermark extraction to unwatermarked data for generating a first set of intermediate extracted values; identifying a first set of target values that are to replace the intermediate extracted values; computing the difference between the first set of target values and the first set of intermediate extracted values; and adding the computed difference throughout the unwatermarked data. In a preferred embodiment of the method of the present invention, the step of identifying a first set of target values that are to replace the intermediate extracted values further includes the substeps of: applying a transform to the first set of intermediate extracted values; applying a further partial watermark extraction to the transformed first set of intermediate extracted values to obtain a second set of intermediate extracted values; identifying a second set of target values that are to replace the second set of intermediate extracted values; computing the difference between the second set of target values and the second set of intermediate extracted values; adding the computed difference throughout the transformed first set of intermediate extracted values to obtain a transformed first set of target values; and applying an inverse transform to the first set of transformed target values to obtain the first set of target values.

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First Claim