In this era, network security has become an issue of importance, on which lot of research is going on. We have proposed a two level image encryption method using elliptic curve cryptography (ECC) which has been made more efficient by Markov random field (MRF). In this method a texture image generated using seed by MRF. This seed is use as secrete key that generated by elliptic curve method. XOR...

Spectral sharpening of speech has been proposed as a possible method for improving speech understanding by listeners with hearing loss. Animal neural physiological data and cochlear models differ in their predictions as to the potential success of spectral sharpening for improved speech recognition. Data from early implementations of spectral sharpening are also ambiguous. Our recent investigat...

Abstract: Wald’s protocol is the most widely accepted protocol to assess pan-sharpening algorithms. In particular, the synthesis property—which is usually validated on a reduced scale—is thought to be a necessary and sufficient condition of a success image fusion. Usually, the synthesis property is evaluated at a reduced resolution scale to take the original multispectral (MS) image as referenc...

We determine the possible eigenvalues of elliptic matrices A,B, C in PU(2, 1) satisfying ABC = 1. This is done by describing geometrically the image of a certain momentum map for the (non-compact) group action of PU(2, 1) by conjugation on C1 × C2 where C1 and C2 are fixed elliptic conjugacy classes in PU(2, 1). Surprisingly, this image is not always convex, rather it is the union of one, two o...

–In real time remote sensing it is necessary to know the quality of images obtained from the different satellite sensors. Pan-sharpening enhances the spatial information of input raw multispectral images. This paper focuses on the evaluation and analysis of eight frequently used image quality assessment methods to determine the preservation of spectral and spatial integrity in the pan-sharpened...

Given an elliptic curve E/Q, the torsion points of E give rise to a natural Galois representation ρE : Gal(Q/Q) → GL2(Ẑ) associated to E. In 1972, Serre showed that [GL2(Ẑ) : Im ρE ] ≥ 2 for all non-CM elliptic curves. The main goal of this paper is to exhibit an elliptic surface such that the Galois representations associated to almost all of the rational specializations have maximal image. Fu...

A scheme that integrates digital signature and data hiding to provide hi–tech authentication for palette images is proposed in this paper. The scheme extracts digital signature from the original palette image and embeds it back into the same palette image, avoiding additional signature file. Digital signature generation is employed using elliptic curve based public key cryptosystem. The perform...

This paper presents a fuzzy edge guided image sharpening technique. Sharpened image is obtained by subtracting the smoothed image of an input image from itself. Image smoothening is carried out with median filtering technique. Median filtering technique is a process of replacing the concerned pixel by the median value of pixels within a block as the concerned pixel is at center. Smoothening is ...

Previously we have presented a selective sharpening method for monochrome images. Our method is based on the simultaneous nonlinear reaction-diffusion time-evolution equipped with a nonlinear diffusion term, a reaction term and an overshooting term, and can sharpen degraded edges blurred by several causes without increasing the visibility of random noise. This paper extends our method to select...

Optical character recognition (OCR) is a technology to digitize paper-based document digital form. This research studies the extraction of characters from Thai vehicle registration certificate via Google Cloud Vision API and Tesseract OCR. The performance both OCR APIs also examined. 84 color image files comprised three sizes/resolutions five characteristics. For suitable type comparison, greys...