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This paper presents a novel method of blind image watermarking in contourlet domain. We have used spread spectrum technique for additive watermark embedding. A correlation detector is used to detect the embedded pseudorandom sequence. The binary logo thus retrieved proves authenticity of the image. The similarity of the retrieved binary logo with the(More)
— We propose a Path Unaware Layered Routing Protocol (PULRP) for dense underwater 3D sensor networks. An up-link transmission is considered, where a set of underwater sensor nodes report events to the sink node. PURLP algorithm consists of two phases. In the first phase (layering phase), a layering structure is presented which is a set of concentric(More)
We propose a unified cross layer routing protocol with multiple constraints for CDMA multihop cellular networks (MCN). Multiple constraints are imposed on intermediate relay node selection and source to destination path selection. The relay node constraints for routing protocol design are cooperation, interference caused to other nodes and sufficient(More)
A better approach for training a multi-layered feedforward network for pulse compression is presented. The Bayesian regularization technique used for training the network for pulse radar detection results in superior performance in terms of signal-to-sidelobe ratio compared to the Backpropagation algorithm. The presented method also has better range(More)
The authors propose a new hybrid watermarking scheme for copyright protection of color images using contourlet transform and singular value decomposition. The host color image and color watermark images are decomposed into directional sub-bands using contourlet transform and then applied Singular value decomposition to mid frequency sub-band