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Adaptive Segmentation for Unconstrained Iris Recognition

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Computers, Materials & Continua 2024年第2期78卷 1591-1609页

作者： Mustafa AlRifaee Sally Almanasra Adnan Hnaif ahmad Althunibat Mohammad Abdallah thamer alrawashdeh Faculty of Architecture and Design Al-Zaytoonah University of JordanAmman11733Jordan Faculty of Computer Studies Arab Open UniversityRiyadh11681Saudi Arabia Faculty of Science and Information Technology Al-Zaytoonah University of JordanAmman11733Jordan

In standard iris recognition systems,a cooperative imaging framework is employed that includes a light source with a near-infrared wavelength to reveal iris texture,look-and-stare constraints,and a close distance requirement to the capture *** these conditions are relaxed,the system’s performance significantly deteriorates due to segmentation and feature extraction ***,a novel segmentation algorithm is proposed to correctly detect the pupil and limbus boundaries of iris images captured in unconstrained ***,the algorithm scans the whole iris image in the Hue Saturation Value(HSV)color space for local maxima to detect the sclera *** image quality is then assessed by computing global features in red,green and blue(RGB)space,as noisy images have heterogeneous *** iris images are accordingly classified into seven categories based on their global RGB *** the classification process,the images are filtered,and adaptive thresholding is applied to enhance the global contrast and detect the outer iris ***,to characterize the pupil area,the algorithm scans the cropped outer ring region for local minima values to identify the darkest area in the iris *** experimental results show that our method outperforms existing segmentation techniques using the UBIRIS.v1 and v2 databases and achieved a segmentation accuracy of 99.32 on UBIRIS.v1 and an error rate of 1.59 on UBIRIS.v2.

关键词： Image recognition color segmentation image processing localization

Intelligent Approach for Traffic Orchestration in SDVN Based on CMPR

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Computers, Materials & Continua 2021年第6期67卷 3749-3763页

作者： thamer Alhussain ahmad Ali AlZubi Abdulaziz Alarifi Department of E-Commerce College of Administrative and Financial SciencesSaudi Electronic UniversitySaudi Arabia Department of Computer Science Community CollegeKing Saud UniversitySaudi Arabia

The vehicle ad hoc network that has emerged in recent years was originally a branch of the mobile ad hoc *** the drafting and gradual establishment of standards such as IEEE802.11p and IEEE1609,the vehicle ad hoc network has gradually become independent of the mobile ad hoc *** Internet of Vehicles(Vehicular Ad Hoc Network,VANET)is a vehicle-mounted network that comprises vehicles and roadside basic *** multi-hop hybrid wireless network is based on a vehicle-mounted self-organizing *** compared to other wireless networks,such as mobile ad hoc networks,wireless sensor networks,wireless mesh networks,etc.,the Internet of Vehicles offers benefits such as a large network scale,limited network topology,and predictability of node *** paper elaborates on the Traffic Orchestration(TO)problems in the Software-Defined Vehicular Networks(SDVN).A succinct examination of the Software-defined networks(SDN)is provided along with the growing relevance of TO in *** the technology features of SDN,a modified TO method is proposed,which makes it possible to reduce time complexity in terms of a group of path creation while simultaneously reducing the time needed for path reconfiguration.A criterion for path choosing is proposed and justified,which makes it possible to optimize the load of transport network *** up,this paper justifies using multipath routing for TO.

关键词： SDVN traffic orchestration vehicular networks multipath routing

An Automated Approach to Generate Test Cases From Use Case Description Model

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Computer Modeling in Engineering & Sciences 2019年第6期119卷 409-425页

作者： thamer A.Alrawashed Ammar Almomani ahmad Althunibat Abdelfatah Tamimi Department of Software Engineering Alzaytoonah University of JordanAirport StreetAmmanJordan IT-department Al-Huson University CollegeAl-Balqa Applied UniversityP.O.BoxSaltJordan

Test complexity and test adequacy are frequently raised by software developers and testing ***,there is little research works at this aspect on specification-based testing at the use case description ***,this research proposes an automatic test cases generator approach to reduce the test complexity and to enhance the percentage of test ***,to support the infrastructure for performing automatic,this proposed approach refines the use cases using use case describing template and save it in the text ***,the saved file is input to the Algorithm of Control Flow Diagram(ACFD)to convert use case details to a control flow *** that,the Proposed Tool of Generating Test Paths(PTGTP)is used to generate test cases from the control flow ***,the genetic algorithm associated with transition coverage is adapted to optimize and evaluate the adequacy of such test cases.A money withdrawal use case in the ATM system is used as an ongoing case *** results show that the generated test cases achieve high coverage with an optimal test *** automatic test case generation approach is effective and ***,it could promote to use other test case coverage criteria.

关键词： Software testing test cases software specifications genetic algorithm

Influence of diversion angle on water and sediment flow into diversion channel

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International Journal of Sediment Research 2020年第6期35卷 600-608页

作者： Nashwan Kamalaldeen Alomari Badronnisa Yusuf thamer ahmad Mohammad Abdul Halim Ghazali Department of Dams and Water Resources College of EngineeringUniversity of Mosul Department of Civil Engineering Faculty of EngineeringUniversiti Putra MalaysiaUPM Serdang Department of Water Resources Engineering University of Baghdad

Accumulation of the sediment in the stream of the diversion channels adversely affects its operational *** channels are often constructed perpendicular to the main *** this study,the water flow and sediment transport in the diversion channel with different angles were investigated in an attempt to maximize water discharge and minimize sediment discharge.A physical model with movable bed was used to simulate water and sediment flow with five diversion angles(θ) between(30°-90°).Moreover,three bed width ratios(Br)(the relation between diversion to main channel bed width) between 30% and 50% and five total discharges between(7.25 L/s to 12.25 L/s) were considered for each case of(θ).The results showed,up to 10%,increasing in proportion discharge ratios for 30 and 45 diversion angles compared with 90° diversion *** results also showed that the lowest diversion sediment concentration was provided by the(0) of *** all scenarios,the average proportion concentration reduction was 64%,compared with 90°diversion *** observation of the diversion system mechanism confirmed that decreased(θ) result in decreased sediment concentrations in the diversion *** conclusion,the diversion channel water and sediment discharge could be effectively managed by changing the(θ) to 30° or 45° instead of 90°.

关键词： Diversion channel Diversion angle Lowest diversion sediment concentration Bed width ratio Sediment concentration

Detection and Classification of Hemorrhages in Retinal Images

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Computer Systems Science & Engineering 2023年第2期44卷 1601-1616页

作者： Ghassan Ahmed Ali thamer Mitib ahmad Al Sariera Muhammad Akram Adel Sulaiman Fekry Olayah College of Computer Science and Information Systems Najran UniversityNajran61441Saudi Arabia Department of Studies in Computer Science University of MysoreMysoreIndia

Damage of the blood vessels in retina due to diabetes is called diabetic retinopathy(DR).Hemorrhages is theﬁrst clinically visible symptoms of *** paper presents a new technique to extract and classify the hemorrhages in fundus *** normal objects such as blood vessels,fovea and optic disc inside retinal images are masked to distinguish them from *** masking blood vessels,thresholding that separates blood vessels and background intensity followed by a newﬁlter to extract the border of vessels based on orienta-tions of vessels are *** masking optic disc,the image is divided into sub-images then the brightest window with maximum variance in intensity is *** the candidate dark regions are extracted based on adaptive thresholding and top-hat morphological *** are extracted from each candidate region based on ophthalmologist selection such as color and size and pattern recognition techniques such as texture and wavelet *** different types of Support Vector Machine(SVM),Linear SVM,Quadratic SVM and Cubic SVM classiﬁer are applied to classify the candidate dark regions as either hemor-rhages or *** efﬁcacy of the proposed method is demonstrated using the standard benchmark DIARETDB1 database and by comparing the results with methods in *** performance of the method is measured based on average sensitivity,speciﬁcity,F-score and *** results show the Linear SVM classiﬁer gives better results than Cubic SVM and Quadratic SVM with respect to sensitivity and accuracy and with respect to speciﬁcity Quadratic SVM gives better result as compared to other SVMs.

关键词： Diabetic retinopathy hemorrhages adaptive thresholding support vector machine

Mode-locked fiber laser in the C-band region for dual-wavelength ultrashort pulses emission using a carbon nanotube saturable absorber

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Chinese Optics Letters 2019年第5期17卷 30-33页

作者： Kuen Yao Lau Pin Jern Ker ahmad Fauzi Abas Mohammed thamer Alresheedi Mohd Adzir Mahdi Electronics Research Group. Institute of Power Engineering Uni ver sit i Tenaga Nasional43000 Kajang SelangorMalaysia Department of Electrical Engineering College of EngineeringKing Saud UniversityRiyadh 11421Kingdom of Saudi Arabia Wireless and Photonics Networks Research Centre Faculty of EngineeringUniversiti Putra Alalaysia43400 UPM Ser dangSelangorJMalaysia

A saturable absorber is commonly employed to generate an ultrashort laser with a mode-locking scheme. In an erbium-doped fiber laser system, the laser regimes of either 1530 or 1550 nm wavelength are procured based on the absorption profile of the erbium-doped fiber. The absorption of the erbium-doped fiber is designed to emit at both wavelengths by controlling the net gain of the laser cavity. Subsequently, simultaneous erbium-doped fiber laser emission is attained at 1533.5 and 1555.1 nm with the pulse duration of 910 and 850 fs, ***, this work maximizes the output portfolios of a mode-locking fiber laser for dual-wavelength ultrashort pulses emission.

关键词： mode-locking scheme C-band region dual-wavelength ultrashort pulses emission using

Broad bandwidth SOA-based multiwavelength laser incorporating a bidirectional Lyot filter

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Chinese Optics Letters 2018年第9期16卷 22-26页

作者： Abdul Hadi Sulaiman Muhammad Zamzuri Abdul Kadir Nelidya Md Yusoff Noran Azizan Cholan Fairuz Abdullah ahmad Fauzi Abas Mohammed thamer Alresheedi Mohd Adzir Mahdi Wireless and Photonic Networks Research Center Faculty of Engineering University Putra Malaysia 43400 UPM Serdang Malaysia Institute of Power Engineering Universiti Tenaga Nasional Jalan IKRAM-UNITEN 43000 Kajang Malaysia Department of Physics Kulliyyah of Science International Islamic University Malaysia 25710 Kuantan Malaysia Razak School of Engineering & Advanced Technology Universiti Teknologi Malaysia Kuala Lumpur Jalan Sultan Yahya Petra 54100 Kuala Lumpur Malaysia Department of Communication Engineering Faculty of Electrical and Electronics Engineering Universiti Tun Hussein Onn Malaysia 86400 Batu Pahat Malaysia Department of Electrical Engineering College of Engineering King Saud University Riyadh 11421 Saudi Arabia

We demonstrate a broad bandwidth multiwavelength laser based on a bidirectional Lyot filter and a semiconductor optical amplifier with a mechanism of intensity-dependent loss as the flatness agent. A wide bandwidth of a multiwavelength spectrum of 32.9 nm within a 5 dB uniformity is obtained under optimized polarization param- eters. For this case, the number of generated lasing lines is 329 with a fixed wavelength separation of 0.1 nm. The power stability of this multiwavelength laser is less than 1.35 dB within 200 min time frame. This shows that the bidirectional Lyot filter provides an alternative option for multiwavelength generation in laser systems.

关键词： SOA Broad bandwidth SOA-based multiwavelength laser incorporating a bidirectional Lyot filter PMF HWP