A novel blind robust image watermarking in DCT domain using inter-block coefficient correlation

This paper presents a novel blind watermarking algorithm in DCT domain using the correlation between two DCT coefficients of adjacent blocks in the same position. One DCT coefficient of each block is modified to bring the difference from the adjacent block coefficient in a specified range. The value...

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Bibliographic Details
Published inInternational journal of electronics and communications Vol. 68; no. 3; pp. 244 - 253
Main Authors Das, Chinmayee, Panigrahi, Swetalina, Sharma, Vijay K., Mahapatra, K.K.
Format Journal Article
LanguageEnglish
Published Elsevier GmbH 01.03.2014
Subjects
DCT
Image watermarking
Inter-block correlation
Robustness
Inter-block correlation
Image watermarking
Robustness
DCT
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ISSN1434-8411
1618-0399
DOI10.1016/j.aeue.2013.08.018

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Summary:This paper presents a novel blind watermarking algorithm in DCT domain using the correlation between two DCT coefficients of adjacent blocks in the same position. One DCT coefficient of each block is modified to bring the difference from the adjacent block coefficient in a specified range. The value used to modify the coefficient is obtained by finding difference between DC and median of a few low frequency AC coefficients and the result is normalized by DC coefficient. The proposed watermarking algorithm is tested for different attacks. It shows very good robustness under JPEG image compression as compared to existing one and also good quality of watermark is extracted by performing other common image processing operations like cropping, rotation, brightening, sharpening, contrast enhancement etc.
ISSN:1434-8411
1618-0399
DOI:10.1016/j.aeue.2013.08.018