Fragile watermark based on polarity of pixel points

A fragile watermarking scheme for authenticating images based on the Yeung-Mintzer scheme is proposed in this paper. This scheme does provide a better protection against all the attacks proposed for Yeung-Mintzer scheme. A polar set derived from the image blocks is used in the embedding process. The center pixel values of image blocks are perturbed by small quantities in such a way that the perceptual quality of the image is not modified. This paper also analyse the security level with respect to other attacks

Compression performance of JPEG encryption scheme

Recent development in the Internet and Web based technologies require faster communication of multimedia data in a secure form. A number of encryption schemes for MPEG have been proposed. In this paper, we evaluate the compression performance of JPEG which has been encrypted with the zig-zag permutation algorithm, suggest a security enhancement to the scheme, and propose an alternative to entropy coding recommended by JPEG to compensate for the compression drop occurring due to permutation

Design of a Nano Coated Heat Exchanger Working With Organic Nanofluids Using Hybrid Technique

In this paper, we developed the ANFIS to predict the thermal and hydrodynamic properties of two types of Newtonian nano-modules used as crust, shell and tube heat exchanger (STHE). The input data for the ANFIS model are the apparent density of the nanoparticles, the Reynolds number, the thermal conductivity of the nanoparticles, and the brand number. According to the Particle Swam Optimization (PSO) algorithm, multi-component optimization is performed to reduce the overall pressure, increase the heat transfer coefficient and increase the number of nanofluid cores in the STHE. During the optimization, the pressure of the nanofluids decreased and the number of noses (tube side) was calculated using the ANFIS model. The best ANFIS is a combination of spatial neural network and phase organization. Despite the stability of the nanofluids, the heat transfer during cooking is significantly reduced due to its resistance to minerals. The formation and laceration of nanoparticle particles have been experimentally studied. The Comparison of experimental thermal conductivity coefficients between the results of the relationship with ANFIS shows high efficiency and accuracy of the synthetic neural network provided in thermal conductivity data.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author

Compression Tolerant DCT Based Image Hash

With the advent of Internet image authentication has become a central part of research in security. Since JPEG has recommended discrete cosine transform as one of the steps in image compression systems, a hash function which utilizes discrete cosine decomposition is desirable. In this paper, we propose a discrete cosine based hash function which distinguishes acceptable level of compression from image processing modifications such as Median filtering, Gaussian noise addition, and FMLR attack. To increase manipulation detection, we optimize the number of AC coefficients needed in smoothing

Analysis of Composite Leaf Spring Enhanced With Nanoparticles

Weight reduction is now the main issue in automobile industries. In this work due to reduce the weight of steel spring with composite leaf spring due to high strength ratio is need to improve. The main aim is to compare to the load carrying capacity, stiffness and weight savings of composite leaf spring with that of steel leaf spring at rated-load and over-load condition. The analysis has been carried out for the leaf spring made up of steel and Composite materials. Composite specimens are fabricated with two different staking sequences like the (resin with clay and enhanced with Nanoparticles). The thickness and width for constant cross section is maintained on the moulding techniques. The design of multi leaf spring was modeled in PRO-E and imported in ANSYS 14.5.the dimensions of an existing multi leaf spring is taken for modeling and analysis of a laminated composite multi leaf spring with different composite sequence materials subjected to the same load as that of steel spring