23 research outputs found
Hand gesture recognition for multimedia applications
Get PDFHand gesture is potentially a very natural and useful modality for human-machine interaction. It is considered to be one of the most complicated and interesting challenges
in computer vision due to its articulated structure and environmental variations. Solving such challenges requires robust hand detection, feature description, and viewpoint invariant classification.
This thesis introduces several steps to tackle these challenges and applies them in a hand-gesture-based application (a game) to demonstrate the proposed approach.
Techniques on new feature description, hand gesture detection and viewpoint invariant methods are explored and evaluated. A normal webcam is used in the research as input
device. Hands are segmented using pre-trained skin colour models and tracked using the CAMShift tracker. Moment invariants are used as a shape descriptor.
A new approach utilising the Zernike Velocity Moments (ZVMs, first introduced by Shutler and Nixon [1,2]), is examined on hand gestures. Results obtained using the
ZVMs as spatial-temporal descriptor are compared to an HMM with Zemike moments (ZMs). Manually isolated hand gestures are used as input to the ZVM descriptor which generates vectors of features that are classified using a regression classifier. The performance of ZVM is evaluated using isolated, user-independent and user-dependent data.
Isolating (segmenting) the gesture manually from a video stream for gesture recognition is a research proposition only and real life scenarios require an automatic hand
gesture detection mechanism. Two methods for detecting gestures are examined. Firstly, hand gesture detection is performed using a sliding window which segments sequences of frames and then evaluates them against pre-trained HMMs. Secondly, the set of class-specific HMMs is combined into a single HMM and the Viterbi algorithm is then used to find the optimal sequence of gestures.
Finally, the thesis proposes a flexible application that provides the user with options to perform the gesture from different viewpoints. A usable hand gesture recognition
system should be able to cope with such viewpoint variations. To solve this problem, a new approach is introduced which makes use of 3D models of hand gestures (not postures) for generating projections. A virtual arm with 3D models of real hands is created. After that, virtual movements of the hand are simulated using animation
software and projected from different viewpoints. Using a multi-Gaussian HMM, the system is trained on the projected sequences. Each set of hand gesture projections is
marked with its specific class and used to train the single multi-class HMNI with gestures across different viewpoints
A Comparative Study on Using Zernike Velocity Moments and Hidden Markov Models for Hand Gesture Recognition
No full textThe effect of low serum bicarbonate values on the onset of action of local anesthesia with vertical infraclavicular brachial plexus block in patients with End-stage renal failure
No full textVertical infraclavicular brachial plexus block is utilized in patients with chronic renal failure at the time of creation of an arterio-venous fistula (AVF). The aim of this study is to test the effect of impaired renal function, with the resulting deranged serum electrolytes and blood gases, on the success rate and the onset of action of the local anesthetics used. In this prospective clinical study, we investigated the effect of the serum levels of sodium, potassium, urea, crea-tinine, pH, and bicarbonate on the onset of action of a mixture of lidocaine and bupivacaine administered to create infraclavicular brachial plexus block. A total of 31 patients were studied. The success rate of the block was 93.5 % (29 patients). The mean onset time for impaired or re-duced sensation was found to be 8.9 ± 4.7 mins and for complete loss of sensation, was 21.2 ± 6.7 mins. There was no significant association with serum sodium, potassium, urea, creatinine or the blood pH level (P> 0.05). The bivariate correlation between serum bicarbonate level and the partial and complete sensory loss was -0.714 and -0.433 respectively, with significant correlation (P= 0.00, 0.019). Our study suggests that infraclavicular block in patients with chronic renal failure carries a high success rate; the onset of the block is delayed in patients with low serum bicarbonate levels
Heat exchange at the air-sea interface in the Red Sea by equilibrium temperature method
No full text1684-1689For estimating the net heat flux by equilibrium temperature method, the Red Sea is divided into five regions (South, South Central, Central, North Central and North) each extending 3o latitude from near Bab-el-Mandab (13 o N) to Suez Canal (≈28oN). Monthly averages of oceanographic and meteorological data 1995-2012 (1ox1o grid) over the Red Sea are from Comprehension Ocean Atmosphere Data Sets (COADS) and National Oceanic and Atmospheric Administration (NOAA). On an annual basis sea gains heat of 8 and 10 Wm-2 respectively in the South and South Central region. In the Central, North Central and North regions the loss of heat is about 22, 30 and 75 Wm-2 respectively. As a whole the annual average loss of heat from the Red Sea is 22Wm-2. Earlier studies also conclude a net loss of heat at the surface which is compensated by advective heat flux through Bab-el-Mandab varying from 7 to 19 Wm-2
DEA window analysis for assessing efficiency of blistering process in a pharmaceutical industry
No full textc-MET immunostaining in colorectal carcinoma is associated with local disease recurrence
No full textHeart Disease in Adult Syrian Refugees: Experience at Jordan University Hospital
Get PDFBackground: Since 2011, 1.26 million Syrians have immigrated to Jordan, increasing demands on Healthcare service. Information about cardiovascular disease (CVD) in Syrian refugees in general, and specifically in Jordan, is unknown. Objectives: The study aimed to describe CVD in Syrian refugee adults who were referred to Jordan University Hospital (JUH) in terms of diagnosis, presentation, outcome, sources of funding for treatment, and to follow these patients after their discharge. Methods: From January 2012 to October 2016, retrospective analysis was performed on the data of Syrian patients who were referred to JUH. This study describes the diagnoses, treatment, and outcome. It also discusses the funding sources; a follow-up was conducted until January 2017. Results: There were 969 patients referred to JUH with CVD; median age was 56 years, 686 (72.2%) of them were males and 283 (27.8%) were females. Of the patients, 584 had hypertension (60%), 308 (31%) had diabetes mellitus, 281 (29.0%) suffered from dyslipidemia, and 237 were smokers (24%). There were 69.6% who had coronary artery disease (CAD) and 20 patients (2%) had valvular heart disease. Treatment was offered to 489 patients (49.5%), but only 322 (65.8% of treatment offered and 33.2% of referrals) of them received the intended treatment. Mortality rate was 3% and loss of follow-up was 49.2%. Funding for procedures mostly came from the Jordanian Health Aid Organization, the United Nations, NGOs, and charities. Sixty-four (13.3% of referred) patients were denied any funding during the time frame of this study. Conclusions: CVD is a major issue for both Syrian refugee patients and the Jordanian healthcare system. CAD and classic cardiovascular risk factors (specifically arterial hypertension, diabetes, and dyslipidemia) are most common in this specific population. Inadequate primary healthcare, suboptimal living conditions, lack of funding, and loss of patient contact are among the major challenges facing this vulnerable population
Upper Limb Ischemia Due to Arterial Thrombosis after COVID-19 Vaccination
No full textThis report describes a case of a 60-year-old male patient who received the first dose of the AstraZeneca vaccine and presented to the emergency department complaining of left hand pain and paresthesia. Investigations revealed upper limb ischemia; he was hospitalized for further management
Giant Spontaneous Femoral Artery Pseudoaneurysm Treated with Covered Stents : Report of a rare presentation and review of literature
Get PDFWe report the case of a 62-year-old woman who presented with a one-month history of a pulsatile mass, with no antecedent trauma or intervention. Imaging showed a large pseudoaneurysm (PSA) of the distal portion of the left superficial femoral artery. The PSA was treated successfully with endovascular placement of covered stents
Mediastinal Bronchogenic Cysts: Clinical Presentation, Diagnosis, and Treatment Outcomes
Get PDFBackground and aims: Bronchogenic cysts are rare mediastinal tumors caused by foregut malformations. Although surgery remains the definitive form of diagnosis and treatment, we can reach a diagnosis by imaging modalities. This retrospective study aims to analyze our experience with bronchogenic cysts and present a discussion of the demographics of patients, patient signs and symptoms, and cyst complications, as well as a surgical approach for resection and surgical outcomes for patients described in this study.Methods: This retrospective, descriptive cross-sectional study reviewed the medical records of 12 patients who were formally diagnosed with bronchogenic cysts by histopathology and treated surgically between 2010 and 2020. We reviewed the medical records of all patients, including age, location of the cyst, symptoms, complications, imaging techniques, and surgical interventions.Results: In total, twelve bronchogenic cyst cases were included. Eight mediastinal cysts (two intrathymic) and four intraparenchymal cysts. One patient was asymptomatic, and the remaining 11 were symptomatic. The most common symptoms were chest pain, dyspnea, and cough. Four cases suffered from severe bronchogenic cyst complications, of which three had pneumonia and one atelectasis. The longest axis of a bronchogenic cyst ranged from 2–11cm (mean = 4.52cm). All 12 patients underwent complete surgical resection of the cyst without postoperative complications or recurrence.Conclusion: Although bronchogenic cysts are rare, they should be considered in the differential diagnosis of diagnosing mediastinal tumors. In both symptomatic and asymptomatic cases, complete surgical resection is the best option to prevent future recurrence and complications, such as malignancy
