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When signals exhibit non-Gaussian statistics, nonlinear signal processing techniques offer advantages over their linear counterparts. Nonlinearity in high-resolution synthetic aperture radar (SAR) imagery is an intrinsic phenomenon often overlooked in the radar literature. In this paper, we study the nonlinear dynamics, and the effect of detection, in SAR imagery. To this end, two complementary methods...
This article presents a novel method of classification of plants using their leaves. Major plant species have unique leaves which are different from each other by features as shape and texture. The primary step for the identification is detection of the edges of plant leaves which is done by Otsu's algorithm, texture features from Gray Level Cooccurrence Matrix and binary morphology. We propose a...
In this paper, three moment invariants techniques have been used to extract the shape properties of the image. There are geometric moment, zernike moment and united moment invariants. These moment invariants have been used to analyze the image due to its invariant features of an image based on scaling factor and rotation. A set of equations known as intra-class analysis has been applied to measure...
Airborne ultrasonic images are not often used in practice, mainly because of the poor air propagation properties of ultrasonic frequencies and high necessary computation resources. The availability of powerful signal processors and the need to have solutions in some special environments, such as dark, smog or fog, require the reconsideration of airborne ultrasonic images, using classic or classic...
We use a Ground Penetrating Radar (GPR) to localize eggs of sea turtles laid in sand. GPR technology has been developed to detect subsurface structures, and successfully applied in archeology, civil engineering, and demining. Typical uses rely on relatively strong signals due to high contrast in dielectric properties of the buried manmade objects and the soil. Signal to noise ratios in our task are...
We study the constant false alarm rate matched subspace detector (CFAR MSD) of a signal observed under additive noise following a complex elliptically symmetric (CES) distribution which include the class of compound-Gaussian (CG) distributions as special cases. We prove that the detector is distribution-free under the null (signal free) hypothesis and derive simple expressions for the probability...
Morphological analysis is a relatively new signal processing method for the extraction of bearing fault features. Its main idea is to intersect the morphological shape of a signal with a structuring element (SE). Among all different SEs, flat structuring element is popularly used in morphological analysis because of its straightforward shape and effectiveness in revealing bearing fault cyclic features...
This paper proposes a new synchronous control law to perform multiple mobile robots trajectory tracking while maintaining time-varying formations. Each robot is controlled to track its desired trajectory while synchronizing its motion with the two nearby robots to maintain the desired time-varying formation. The dynamic model of the wheeled mobile robot (WMR) is derived, so as, it can be divided into...
Handwriting recognition is the ability of a computer to receive and interpret intelligible handwritten input. Recognition systems are divided into two categories: holistic approach and analytical approach. A holistic approach handles the whole input image, while analytical approach involves two steps namely; segmentation and combination. Handwriting recognition began long time ago mainly in Latin...
The modern age is characterized by great professional and private multi-media production of which the largest percentage are images. Search a large number of images from the user's perspective is almost always based on content. The aim of this work is to create a database search algorithm for images that is content based. Starting from the features matrix, algorithm is based on working with color,...
The Mobile Hall Sensor Array system is a dynamic moving device capable of ferromagnetic shape evaluation based on the magnetic flux leakage testing principle. The device consists of a linearly integrated 1-D Hall Sensor array to detect magnetic field changes on a ferromagnetic shape under evaluation. The signal processing application software residing on a computer is developed for the Hall sensor...
The paper presents a design and fabrication technology of the pinnae, i.e. external ear in the context of biomimetic sonar heads building for in air sonar applications. The basic steps and formula of the design process are described followed by a description of the fabrication technology for various sizes and shapes of pinnae. The experimental measurements are focused on voltage sensibility and pattern...
The problem of finding a pair of biorthogonal functions for the case of finite and discrete signals is considered. Starting from two initial functions which are not necessarily biorthogonal, a general procedure to construct biorthogonal ones is given. Compared to previous orthogonalization methods, this method is more general, flexible and also more systematic. Numerical results are also given to...
This paper is concerned with the development of the wearable sensor system for recognizing Braille. We have developed a compact wearable sensor using a Polyvinylidene Fluoride (PVDF) film. The sensor output is obtained with the sensor mounted onto a fingertip moving over Braille manually. The operation examination for visually-impaired and healthy subjects who are blindfolded is carried out. From...
In this paper, an investigation is made on how sidelobes can be suppressed in ultrawideband-ultrawidebeam (UWB) Synthetic Aperture Radar (SAR) using apodization. Due to the special properties of UWB SAR such as very wide integration angle and very large relative bandwidth, the support for the spectrum of a SAR image differs distinctively from a rectangle, which is the normal approximation in narrowband-narrowbeam...
In this paper an application, implemented functions and data base of welds defects destined to an Intelligent System for Radiogram Analysis ISAR for welds quality inspection is presented. System has to improve information contained in the radiogram, extract defects and decide on welds quality taking into account the relevant regulations.
In the last decades, many solutions have been proposed to cope with high Peak-to-Average Power Ratio (PAPR) of OFDM communication systems. We propose here to address the high PAPR of signals whose spectrum's amplitude respects a given mask. A versatile framework based on Set Theoretic Estimation is presented and opens doors to new algorithms as the Reflection Onto Convex Sets algorithm. The latter...
A method to identify, thanks to RF signals, the letters of the alphabet is presented in this paper. Every letter, when integrated, or realized with metallic strips, on dielectric substrate and excited with an electromagnetic wave exhibits an electromagnetic signature. This signature is unique and characterizes the RCS of the radiating letter. Consequently, it could be used for identification/recognition...
A common practical problem when implementing signal model-fitting procedures is that of the frequency local minima. Unfortunately, conventional optimization methods, like Steepest Descent, Newton's Method and Conjugate Gradients (CG) are subject to this problem. What is worse, if the estimated frequency is not correct, the estimated signal amplitude and decay rate will be incorrect. In this paper,...
Intelligent Fiber Optic Systems Corporation (IFOS) is developing a Fiber Bragg Grating (FBG) integrated Structural Health Monitoring (SHM) sensor system capable of load monitoring as well as detecting, locating and quantifying cracks and de-laminations in composite structures such as smart composite wings with embedded FBG sensors. This paper describes an approach that enables analysis of complex...
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