21-07-2023 дата публикации
Номер: CN116467685A
Принадлежит:
The invention discloses a reversible database watermark embedding and extracting method, and belongs to the field of digital watermarking, the embedding method comprises the following steps: S1, preprocessing database data, carrying out row scrambling on database tuples, and uniformly grouping the tuples after row scrambling; s2, dividing the database into a blank set and a shadow set in each group, and executing a diamond predictor on the attribute value of the shadow set to obtain a prediction error value; s3, counting the frequency of the absolute value of the prediction error value of the shadow set, and constructing a prediction error histogram of the shadow set; s4, for the prediction error histogram of the shadow set, determining an embedded carrier and embedded watermark information thereof; s5, watermark embedding and attribute value modification are carried out through a histogram translation method; and S6, repeating the steps S1 to S5 for the blank set in the second layer embedding ...
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