Robust and blind watermarking technique in DCT domain using inter-block coefficient differencing

In this paper, a robust blind watermarking technique, based on block-based DCT coefficient modification is proposed. The difference between two DCT coefficients of the adjacent blocks at the same position is calculated. Depending upon the watermark bit to be embedded; this difference is brought in a...

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Bibliographic Details
Published inDigital signal processing Vol. 53; pp. 11 - 24
Main Authors Parah, Shabir A., Sheikh, Javaid A., Loan, Nazir A., Bhat, Ghulam M.
Format Journal Article
LanguageEnglish
Published Elsevier Inc 01.06.2016
Subjects
Blind watermarking
Blinds
Blocking
Coefficient differencing
Coefficients
Digital signal processing
Hybrid attacks
Mathematical analysis
Robustness
Watermarking
Hybrid attacks
Blind watermarking
Robustness
Coefficient differencing
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Summary:In this paper, a robust blind watermarking technique, based on block-based DCT coefficient modification is proposed. The difference between two DCT coefficients of the adjacent blocks at the same position is calculated. Depending upon the watermark bit to be embedded; this difference is brought in a particular predefined range which is achieved by modifying one of the two DCT coefficients. The amount of modification to a DCT coefficient of a block depends upon the scaling variable, DC coefficient and median of certain zig-zag ordered AC coefficients of that block. The robustness of the proposed scheme has been examined for various singular and hybrid attacks. Comparison results reveal that the proposed technique has a higher degree of robustness against various singular and hybrid attacks. Further a watermark of good quality is extracted even after various simultaneous attacks on the system.
Bibliography:ObjectType-Article-1
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ISSN:1051-2004
1095-4333
DOI:10.1016/j.dsp.2016.02.005