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A Robust DCT based Digital Image Watermarking using Random Mid-band Coefficient Exchange Scheme for Gray Scale Images
| International Journal of Computer Applications |
| Foundation of Computer Science (FCS), NY, USA |
| Volume 100 - Number 8 |
| Year of Publication: 2014 |
| Authors: Alisha Parnami, Ankit Gupta, Gagan Parnami |
10.5120/17543-8127
|
Alisha Parnami, Ankit Gupta, Gagan Parnami . A Robust DCT based Digital Image Watermarking using Random Mid-band Coefficient Exchange Scheme for Gray Scale Images. International Journal of Computer Applications. 100, 8 ( August 2014), 6-10. DOI=10.5120/17543-8127
Abstract
Various watermarking algorithm has been developed in recent years. The two-dimension DCT and its counterpart Inverse 2-D DCT, are the most complex parts in the DCT-based watermarking systems. In this paper, the watermark to be inserted in the cover image is encrypted through a proposed encryption strategy to enhance the overall security instead of embedding the exact watermark bits. Every unique sequence of four bits is mapped to a unique sequence of length eight. These sequences are generated by a seeded pseudo-random generator. Due to this, size of the bits becomes double but the advantage is that the watermark cannot be detectable through normalized correlation. The encrypted watermark is inserted into the image using proposed randomized discrete cosine transform (DCT) based mid-band coefficients exchange scheme. To extract the original watermark, it is required to decrypt the extracted bits. Mapping with the same pseudo-random sequences is done. The strategy is robust against the blind watermark detection. Different Gray scale images of size (512* 512) have been used in this approach. The proposed method shows better results in terms of PSNR.
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