With widespread of the Internet as well as the numerous applications that involve audio signals and systems, the issue of ownership proof become imperative. In this paper, we present an audio watermark scheme that is ...
详细信息
With widespread of the Internet as well as the numerous applications that involve audio signals and systems, the issue of ownership proof become imperative. In this paper, we present an audio watermark scheme that is based on Empirical Mode Decomposition and Hilbert Huang Transform. The audio signal is decomposed into several mono-component signals or Intrinsic Mode Functions to serve as the addressee for watermark. The watermark is a pseudo random number which is added to the highest and lowest Intrinsic Mode Functions of the signal to generate what we call the modified IMFs which is in turn added to the remaining IMFs to produce the watermarked signal. Our experimental results show that the proposed method is robust against signal processing attacks such as MP3, time scale modification, resizing, and others. The obtained results meet the recommended imperceptibility signal to noise ratio.
We propose a novel Markovian segmentation model which takes into account edge information. By construction, the model uses only pairwise interactions and its energy is submodular. Thus the exact energy minima is obtai...
详细信息
Grain size of forged nickel alloy is an important feature for the mechanical properties of the material. For fully automatic grain size evaluation in images of micrographs it is necessary to detect the boundaries of e...
详细信息
We present a visualization and manipulation framework for three-dimensional medical environments. The MVC architecture of the. framework allows the use of different API technologies such us OpenGL and DirectSD, differ...
详细信息
We present a visualization and manipulation framework for three-dimensional medical environments. The MVC architecture of the. framework allows the use of different API technologies such us OpenGL and DirectSD, different model representations, and controllers. This facilitates the implementation of medical applications offering resources commonly needed by such systems. Two case studies are shown as examples of such applications
We present a method to efficiently simulate fluid flows through tubular structures such as pipes and blood vessels. The method relies on the structure's centerline and for that purpose we present an algorithm to g...
详细信息
We present a method to efficiently simulate fluid flows through tubular structures such as pipes and blood vessels. The method relies on the structure's centerline and for that purpose we present an algorithm to generate an approximate centerline of a tubular structure defined by an ordinary polygonal mesh. As an additional benefit, this center-line provides approximations of measures about the tubular structure such as length of regions of interest and cross-section diameters. The fluid is simulated with the smoothed particle hydrodynamics method and the fluid-structure interaction is simplified to provide interactive rates. The particles can be colored according to physical quantities to better visualize the evolution of the fluid's state in narrow and otherwise obstructed areas.
Skeleton extraction is essential for general shape representation. A typical skeletonization algorithm should obtain the ability to preserve original object's topological and hierarchical properties. However, most...
详细信息
An approach for applying a structural texture analysis method to automatic visual inspection of fabric samples in the textile industry is presented. The main steps (image preprocessing, image segmentation, model descr...
详细信息
暂无评论