This paper presents a novel algorithm and architecture for digital frequency synthesis DFS . It is based on a simple difference equation. Simulation results show that the proposed DFS algorithm is preferable to the conventional phase-locked-loop frequency synthesizer and the direct digital frequency synthesizer in terms of the spurious-free dynamic range SFDR and the peak-signalto-noise ratio P...

The comparison between two approaches, JPEG and Compressive Sensing, is done in the paper. The approaches are compared in terms of image compression. Comparison is done by measuring the image quality versus number of samples used for image recovering. Images are visually compared. Also, numerical quality value, PSNR, is calculated and compared for the two approaches. It is shown that images, re...

This paper investigates the use of fractal coding for image compression and reconstruction. The encoder exploits self-similarity of the image at different resolutions, mapping larger blocks of the image to similar smaller blocks through a series of contractive transformations. The decoder can apply these transformations iteratively to any image, and recover the original. We show that varying th...

This paper present performance-based comparative analysis on wavelet image compression using different wavelet-based techniques. This research covers some background of wavelet analysis, data compression and how different wavelets techniques were used in image compression. The techniques involved in the comparison process are ASWDR, SPIHT, and the new standard JPEG2000. The compression performa...

We adopt the coding/decoding method of image processing based on the direct and inverse fuzzy transforms defined in previous papers. We have considered 100 images of sizes 256 × 256 (pixels) extracted from the wellknown database Corel Galery (Arizona Directory). A comparison with the coding/decoding method based on the fuzzy relation equations with the Lukasiewicz triangular norm is also presen...

In this work, we present a model-aided coder that incorporates 3-D shape and motion information to improve the performance of a video coding system. The 3-D shape model of a rigid body is estimated from the video sequence directly. Using the shape model, the 3-D motion of the rigid body and the background global motion are also estimated for video coding. Experimental results show that bit-rate...

The objective of this paper is to propose a novel method for enhancing end to end QoS of multimedia applications in mobile adhoc networks by using DiffServ approach and Multi Description Coding. The enhancement is achieved by implementing the Multi Description Coding (MDC) at application layer along with Connectionless Light Weight Protocol (UDPLite) in transport layer, Multipath routing and DI...

We show that the vector quantizer (VQ) techniques can be used to optimize a matching pursuit dictionary and improve the PSNR performance at low bitrates. The basis functions are the shape part, and the inner product values are the gain part of the VQ. The performance is evaluated based on a comparison of the PSNR in encoding motion residuals obtained using a matching pursuit coder with a refere...

The higher resolution image can be reconstructed from lower resolution images using SuperResolution (SR) algorithm based on Support Vector Regression (SVR) by combining the pixel intensity values with local gradient information. Support Vector Machine (SVM) can construct a hyperplane in a high or infinite dimensional space which can be used for classification. Its regression version, Support Ve...

introduction non-invasive fluorescent reflectance imaging (fri) is used for accessing physiological and molecular processes in biological media. the aim of this article is to separate the overlapping emission spectra of quantum dots within tissue-equivalent phantom using svd, jacobi svd, and nmf methods in the fri mode. materials and methods in this article, a tissue-like phantom and an optical...