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PII: S232251141300001-2
Iris Image Denoising With Contourlet Transform

Original Research, B1

J. World. Elect. Eng. Tech., 2(1): 01-04, 2013

ABSTRACT: The purpose in this paper is using a Contourlet transform and for denoising iris image. First in this paper we segment the image with Daugman methods. Then we try mapping the iris disk to 64×512 pixels with using convert polar coordinates to Cartesian. We applied preprocessing before the feature extraction that will improve the efficiency of image in feature extraction stage. The results show that the signal to noise when we used form Contourlet for image denoising is better that when we used other filter for image denoising.
Keywords: Contourlet, denoise, iris, segmentation.

PII: S232251141300002-2

Fast Iris Recognition

Original Research, B2

J. World. Elect. Eng. Tech., 2(1): 05-08, 2013

ABSTRACT:The purpose of this paper is to achieve a system with fast response. Necessary pre-processing to achieve the feature extraction stage are image segmentation, image normalization, image quality improvement and image denoising. After above steps we need to extract features and encode them .in this paper we used Symlet4 wavelet transform for extract features. Then we propose two algorithms for fast response of identification system. Our first suggestion is to convert all database two classes. Anyone who wants to confirm identify, import their code and so all details converted  into two classes .someone who wants to confirm identify is a class and remaining data is another class. The second proposed approach is using a threshold for similarity measure.
Keywords: Contourlet transform, iris recognition, Symlet, Gauss-Laplace, normalized, segmentation.

PII: S232251141300003-2
A New Miniaturized UWB  CPW-Fed Slot Antenna With  Tapering Feed Line

Original Research, B3

J. World. Elect. Eng. Tech., 2(1): 09-012, 2013

ABSTRACT: A planar CPW-fed monopole slot antenna, with tapered feed line and H- shaped slot in ground plane is presented. The antenna has been printed on FR4 substrate with the dimension of 14mm×18mm×1mm. The experimental results demonstrate that the impedance bandwidth of proposed antenna ranges from 3.3 to 13 GHz for VSWR ≤ 2, and according to the simulation it has omnidirectional radiation pattern in H-plane and symmetrical in E-plane.
Keywords: Ultra wideband antennas, Coplanar waveguide, slot antennas.

PII: S232251141300004-2
A Simple Defected Ground Structure (DGS) for Reduction of Mutual Coupling in Closely-Spaced Microstrip Arrays

Original Research, B4
Habashi A., Mirzamohamadi F., Habashi S., Nourinia J.
J. World. Elect. Eng. Tech., 2(1): 13-16, 2013

ABSTRACT: A sufficient and simple method to minimize the mutual coupling between closely-spaced microstrip antennas in an H-plane array format, operating at the same frequency is presented. More isolation can be provided through multiple rectangular defected ground structures (DGSs) between the antennas. Inter-element mutual coupling before and after using the proposed DGSs is investigated. The length, width and number of the rectangular DGSs have been optimized for more mitigating the mutual coupling (S12). Position of the DGSs is also the other important factor to have a best performance. By using this technique, more than 31 dB isolation between two patch antennas with a side by side distance of only 1/4 free-space wavelength at resonance frequency of 9.2 GHz can be obtained.
Keywords: Mutual coupling reduction, patch antenna array, defected ground structures.