3D geometry is one of the most extensively used data in military, engineering, and multimedia communication. In a distributed environment, efficient visual data exchange is desirable for real-time collaboration. Geometry compression is an effective way to distribute high-volume geometry data within limited bandwidth and storage capacity. In this paper, a new time-varying 3D geometry compression...

In today’s world of computers everyone is communicating their personal information through the web. So, security main concern from research point view. Steganography can be used for purpose information. Storing and forwarding embedded specifically in public places gaining more attention day by day. this work, Integer Wavelet Transform technique along with JPEG (Joint Photograph Expert Group) co...

This paper presents a computational algorithm for identifying power frequency variations and integer harmonics by using waveletbased transform. The continuous wavelet transform (CWT) using the complex Morlet wavelet (CMW) is adopted to detect the harmonics presented in a power signal. A frequency detection algorithm is developed from the wavelet scalogram and ridges. A necessary condition is es...

This paper proposes a three-dimensional (3D) integer wavelet transform with reduced amount of rounding noise. Non-separable multi-dimensional lifting structures are introduced to decrease the total number of lifting steps. Since the lifting step contains a rounding operation, variance of the rounding noise generated due to the rounding operation inside the transform is reduced. This paper also ...

This paper presents a novel reversible data-embedding method for digital images using integer wavelet transform and companding technique. This scheme takes advantage of the Laplacian-like distribution of integer wavelet coefficients in high frequency subbands, which facilitates the selection of compression and expansion functions and keeps the distortion small between the marked image and the o...

With the tremendous amount of images distributed over Internet, image authentication has drawn extensive attention for integrity verification. For instance, watermarking fragile to malicious modifications while robust to data compression has been proposed for image authentication. However, the security of watermark has not received enough attention yet. In this paper, we propose a secure semi-f...

Semi-fragile watermark fragile to malicious modifications while robust to incidental manipulations is drawing many attentions in image authentication. However, watermark security has not received enough attention yet. Lifting scheme can construct second generation wavelets. With regard to the first generation wavelets, its implementation is easier, simpler and faster than the Mallat algorithm. ...

Abstract: Digital Image watermarking is one of the most active and challenging subjects in the information hiding research because it is an efficient solution to protect the copyright of the digital media. This paper proposes a new robust watermarking approach based on the selection of singular features of host image into which the watermark has to embed. The host image initially subjected to a...