Main Article Content
The paper proposed a novel steganographic technique based on Discrete Cosine Transform (DCT) for multimedia copyright protection in frequency domain. The transformation is implemented on sub-image block called mask of size 2 x 2 of spatial components in row major order for the entire image. After transformation the host image gets converted into sub band images. For embedding we choose middle frequency ranges. Single bit of authenticating secret message/image is fabricated in the real part of middle frequency component of each sub-image block. A minor re-adjustment is incorporated in the first component of each mask after embedding to keep the pixel values positive and non fractional in spatial domain. This approach improves the performance of the Steganographic technique compared to earlier techniques. Robustness is achieved through embedding secrete bits in variable positions of the carrier image byte determined by pseudo random value and subsequent masking. Experimental results depict enhanced performance of the proposed watermarking technique in terms of PSNR, IF, and MSE.
Keywords: QFT, DFT, DCT, MD and TDSTIA
Submission of a manuscript implies: that the work described has not been published before, that it is not under consideration for publication elsewhere; that if and when the manuscript is accepted for publication, the authors agree to automatic transfer of the copyright to the publisher.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work
- The journal allows the author(s) to retain publishing rights without restrictions.
- The journal allows the author(s) to hold the copyright without restrictions.