Performance Comparison of Different Sparse Array Configurations for Ultra-Wideband, Near-field Imaging Applications

Cetin, Beyzat Talat
Alatan, Lale
The aim of this study is to compare the performance of different multiple-input multiple-output (MIMO) array topologies, intended to be used in ultra-wideband (UWB) near-field imaging applications, by using an analysis method that does not include the effects of image reconstruction algorithm. For this purpose, maximum projection method, previously proposed for the analysis of UWB arrays under far-field conditions, is utilized and modified to obtain two way beam patterns of UWB arrays operating in the near-field. The side lobe levels of these beam patterns are shown to be a clear performance criterion for evaluating the performance of sparse antenna arrays. Numerical simulation results are compared with previously reported results for some commonly used array configurations and a good agreement is observed.


The Fast Multipole Method for Sparse Solution of Linear Inverse Scattering Problems
Miran, Emre Alp; Koç, Seyit Sencer (2018-11-02)
The sparse solution for the linear inverse problems provide useful results for many fundamental engineering applications such as radar imaging. The studies in the literature has shown that the computational methods for the sparse solution tend to be slow as the imaging problem gets electromagnetically large, therefore the image reconstruction gets harder for the existing computational resources. The fast multipole method (FMM) can reduce the number of operations and the memory requirement for the solution o...
3D object recognition using scale space of curvatures
Akagündüz, Erdem; Ulusoy, İlkay; Department of Electrical and Electronics Engineering (2011)
In this thesis, a generic, scale and resolution invariant method to extract 3D features from 3D surfaces, is proposed. Features are extracted with their scale (metric size and resolution) from range images using scale-space of 3D surface curvatures. Different from previous scale-space approaches; connected components within the classified curvature scale-space are extracted as features. Furthermore, scales of features are extracted invariant of the metric size or the sampling of the range images. Geometric ...
Performance improvement of a 3-D configuration reconstruction algorithm for an object using a single camera image
Özkılıç, Sibel; Platin, Bülent Emre; Department of Mechanical Engineering (2003)
Performance improvement of a 3-D configuration reconstruction algorithm using a passive secondary target has been focused in this study. In earlier studies, a theoretical development of the 3-D configuration reconstruction algorithm was achieved and it was implemented by a computer program on a system consisting of an optical bench and a digital imaging system. The passive secondary target used was a circle with two internal spots. In order to use this reconstruction algorithm in autonomous systems, an auto...
Performance evaluation of saliency map methods on remotely sensed RGB images
Sönmez, Selen; Halıcı, Uğur; Department of Geodetic and Geographical Information Technologies (2016)
Predictive applications of human eye visualization so called saliency map computational models become more attractive in image processing studies. Saliency map highlights regions that are distinctive from their surrounding in the images in interest. In this study, various computational models for salient region detection are investigated on remotely sensed images. The computational methods considered are Itti-Koch, Graph-Based Visual Saliency, Saliency Detection by Combining Simple Priors, Frequency-tuned S...
Performance improvement of a 3d reconstruction algorithm using single camera images
Kılıç, Varlık; Platin, Bülent Emre; Department of Mechanical Engineering (2005)
In this study, it is aimed to improve a set of image processing techniques used in a previously developed method for reconstructing 3D parameters of a secondary passive target using single camera images. This 3D reconstruction method was developed and implemented on a setup consisting of a digital camera, a computer, and a positioning unit. Some automatic target recognition techniques were also included in the method. The passive secondary target used is a circle with two internal spots. In order to achieve...
Citation Formats
B. T. Cetin and L. Alatan, “Performance Comparison of Different Sparse Array Configurations for Ultra-Wideband, Near-field Imaging Applications,” 2017, Accessed: 00, 2020. [Online]. Available: