Wireless Ad Hoc Networks
A mobile ad hoc network is a relatively new term for an old technology – a network that does not rely on pre-existing infrastructure. Roots of this technology could be traced back to the early 1970s with the DARPA PRNet and the SURAN projects. The new twitch is the application of this technology in the […]
Wavelet based digital image watermarking
A wavelet-based watermark casting scheme and a blind wa- termark retrieval technique are investigated in this research. An adap- tive watermark casting method is developed to rst determine signif- icant wavelet subbands and then select a couple of signi cant wavelet coecients in these subbands to embed watermarks. A blind watermark retrieval technique that can […]
Feature Based Robust Digital Image Watermarking Scheme
A robust digital image watermarking scheme that combines image feature extraction and image normalization is proposed. The goal is to resist both geometric distortion and signal processing attacks. We adopt a feature extraction method called Mexican Hat wavelet scale interaction. The extracted feature points can survive a variety of attacks and be used as reference […]