Abstract
In this paper, the spread spectrum watermarking in wavelet domain is optimised by using a number of techniques to make it more efficient when executed by a platform running on mobile devices. The proposed techniques can be executed efficiently and consume less computational and power resources as compared to the conventional spread spectrum-based watermarking. The proposed technique represents binary bits in the watermark using symbols, wherein each symbol represents at least 2 binary bits. A symbol is then mapped into a pseudo noise sequence and embedded in the digital image. Our analytical results show that our schemes reduce the number of operations required for watermarking by ∼50%, while our experimental results show that our schemes save about ∼59 and ∼67% in processing time and energy consumption, respectively.
Acknowledgement
This work was supported by King Abdulaziz City for Science and Technology, National Science, Technology and Innovation plan (NSTIP) grant numbers 32–702 and 34–988.