Abstract
Almost all of the previous watermarking methods utilize some form of correlation or matched filter during watermark detection. The conventional correlation detector provides optimal performance when the watermarked image goes through additive white noise. In this paper, we propose to use a circular harmonic function (CHF) correlation filter instead of the conventional matched filter at the detector. In this way, we can achieve rotation tolerant correlation peak at the detector. During the filter design, conflicting filter design parameters can be optimally traded off while achieving desired correlation peak in response to rotation of the image. The proposed detector can be used with any watermarking method where rotation of the watermark should be detected. As the filter design can be done off-line, the proposed method can be used in real-time watermark detectors.
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Kim, H., Kumar, B.V.K.V. (2004). Rotation-Tolerant Watermark Detection Using Circular Harmonic Function Correlation Filter. In: Kalker, T., Cox, I., Ro, Y.M. (eds) Digital Watermarking. IWDW 2003. Lecture Notes in Computer Science, vol 2939. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-24624-4_20
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DOI: https://doi.org/10.1007/978-3-540-24624-4_20
Publisher Name: Springer, Berlin, Heidelberg
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