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Title: A new similarity degree of digital watermarks
Authors: Li, L
Zhang, D 
Ruan, L
Keywords: Digital watermarking
Normalized correlation
Similarity degree formula
Issue Date: 2011
Source: ICIC Express Letters, 2011, v. 5, no. 3, p. 727-731 How to cite?
Journal: ICIC Express Letters 
Abstract: The popular formulas of evaluating the similarity of digital watermarks have serious drawbacks: when the similarity degree is 1, the watermarks are not unique. This paper firstly analyzes the drawbacks in the popular formulas, then proposes a new similarity degree formula, which weakens the shortcomings of the existing formulas and overcomes the lack of uniqueness in theory. From the experimental results, the new formula not only does well in evaluating the watermark's similarity degree, but also is in good accordance with visual perception.
ISSN: 1881-803X
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