The Review of Algorithms to Correct Barrel Distortion Image

2012 ◽  
Vol 628 ◽  
pp. 403-409 ◽  
Author(s):  
Min Qi ◽  
Xiao Xi Zhang ◽  
Da Jian Li ◽  
Yang Yu Fan
Keyword(s):  
Coordinate Transformation ◽  
Affine Transformation ◽  
Basic Theory ◽  
Degree Polynomial ◽  
Research Directions ◽  
Advantages And Disadvantages ◽  
Polynomial Transformation ◽  
Polar Coordinate ◽  
The Common ◽  
Barrel Distortion

Aiming at solving the problem of correcting barrel distortion of image, this paper concluded the common correction algorithms into three types which include Affine Transformation, Two Degree Polynomial Transformation and Polar Coordinate Transformation, and introduced the basic theory of each of their representative algorithm. Then, analyzed and compared the advantages and disadvantages of them according to the correction experiments. At last, pointed out the research directions and difficulties of this field. In conclusion, Polar Coordinate Transformation is the most appropriate method to correct barrel distortion image, and the improved algorithm based on Polar Coordinate Transformation is more flexible to work out current difficulties of this aspect.

scholarly journals Research on PIV Algorithm for Matching of Particle Images Based on Affine Transformation

2021 ◽  
Author(s):  
Jia Li ◽  
Da-Long TAN ◽  
Fei Zhao ◽  
Xiang-Ji Yue
Keyword(s):  
Coordinate System ◽  
Coordinate Transformation ◽  
Affine Transformation ◽  
Particle Image ◽  
Polar Coordinate System ◽  
Polar Coordinate ◽  
Affine Line ◽  
Image Pairs ◽  
Rigid Body Transformation ◽  
Particle Images

Abstract For the problems of distortion and rotation in the matching of particle images of turbulent motion, according to the nature of affine transformation, using log-polar coordinate transformation, the matching is achieved by performing correlation calculations on the image line by line, and developed a matching algorithm (Turbulent Particle Image Matching, abbreviation: TPIM) for particle image pairs with affine transformation and rigid body transformation: by moving the interpretation window, the algorithm is no longer restricted by displacements of particles; by setting the affine lines according to the angle of the image in the log-polar coordinate system and using the affine line as the matching unit, the decoupling of different transformation factors is realized; according to the characteristic of non-uniform sampling in log-polar coordinate transformation, based on the principle of not losing image information, by reasonably setting the image mask and the rate of sampling, establishing the image pyramid and the relative coordinate system, the algorithm complexity is reduced to about 15% of the original. The experimental results of various types of particle images show that the matching accuracy of the TPIM algorithm can reach more than 99%.

scholarly journals Extraction and Analysis of Tetrahydrocannabinol, A Cannabis Compound in Oral Fluid

2016 ◽  
Vol 9 (1) ◽  
pp. 30
Author(s):  
Wei Zhang ◽  
Jun Wang ◽  
Zhiyuan Mi ◽  
Jiangtao Su ◽  
Xiangyu You ◽  
...  
Keyword(s):  
Drug Testing ◽  
Oral Fluid ◽  
Solid Phase ◽  
Extraction Methods ◽  
Liquid Extraction ◽  
Phase Extraction ◽  
Advantages And Disadvantages ◽  
Liquid Liquid Extraction ◽  
The Common ◽  
Common Target

Although misuse and abuse of Cannabis is well known, the health benefits have been proved by various biomedical studies. Tetrahydrocannabinol (THC) is the major active substance in leaves of Cannabis, which is the common target for drug testing. In field drug testing, oral fluid (OF) has its unique advantages over other specimens such as blood, urine, and hair. Thus the study of THC in OF is gaining popularity in Cannabis research. In this review, extraction methods are introduced in three categories, which are Liquid-Liquid Extraction (LLE), Solid Phase Extraction (SPE), and Supercritical Fluid Extraction (SFE). Examples of application with each method will be covered. Advantages and disadvantages of these methods will be compared. In addition, methods in analysis following extraction will be briefly discussed.

Cognitive Interview

2018 ◽  
Vol 299 ◽  
pp. 91-98
Author(s):  
Maria Witewska ◽  
Keyword(s):  
Law Enforcement ◽  
Common Law ◽  
Cognitive Interview ◽  
Western Countries ◽  
Advantages And Disadvantages ◽  
The Common ◽  
Polish Law ◽  
Judicial Systems

The article aims at presenting the topic of cognitive interview (CI) taking into account its advantages and disadvantages, as well as the usefulness of its application in Polish law enforcement during pre-trial proceedings. Due to the wide application of this method of questioning, mainly in countries with the common law judicial systems, it is worth considering which of the achievements of combined science and practice from Western Countries may be adapted in Poland. Are there any contraindications to conduct interviews by means of this method? If not, the question arises – what benefits it can bring to Polish practice.

An Inverse Force Analysis of a Planar Two-Spring System

1994 ◽  
Author(s):  
Thomas M. Pigoski ◽  
Joseph Duffy
Keyword(s):  
The Other ◽  
Spring Stiffness ◽  
Force Analysis ◽  
Degree Polynomial ◽  
Real Solutions ◽  
Variable Elimination ◽  
Spring System ◽  
The Common ◽  
Resultant Length ◽  
Inverse Force

Abstract A closed-form inverse force analysis was performed on a planar two-spring system. The two springs were grounded to pivots at one end and attached to a common pivot at the other. A known force was applied to the common pivot of the system, and it was required to determine all of the assembly configurations. By variable elimination, a sixth degree polynomial in the resultant length of one spring was derived, and from this, six real solutions of the point of application of force were obtained. Following this, the applied force was incremented along a line and the six paths of the moving pivot were tracked starting from the zero-load configurations. An analysis of these results showed stability phenomena indicating the workspace of this system contained regions of negative spring stiffness and points of catastrophe.

scholarly journals Imaging Review of Skeletal Tumors of the Pelvis—Part I: Benign Tumors of the Pelvis

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Gandikota Girish ◽  
Karen Finlay ◽  
Yoav Morag ◽  
Catherine Brandon ◽  
Jon Jacobson ◽  
...  
Keyword(s):  
Plain Film ◽  
Clinical History ◽  
Benign Tumors ◽  
Resonance Imaging ◽  
Advantages And Disadvantages ◽  
Radiologic Evaluation ◽  
Imaging Characteristics ◽  
The Common ◽  
Magnetic Resonance Imaging Mri ◽  
Pelvic Lesions

The osseous pelvis is a well-recognized site of origin of numerous primary and secondary musculoskeletal tumors. The radiologic evaluation of a pelvic lesion often begins with the plain film and proceeds to computed tomography (CT), or magnetic resonance imaging (MRI) and possibly biopsy. Each of these modalities, with inherent advantages and disadvantages, has a role in the workup of pelvic osseous masses. Clinical history and imaging characteristics can significantly narrow the broad differential diagnosis for osseous pelvic lesions. The purpose of this review is to familiarize the radiologist with the presentation and appearance of some of the common benign neoplasms of the osseous pelvis and share our experience and approach in diagnosing these lesions.

scholarly journals 2 + 1 Highways: Overview and Future Directions

2018 ◽  
Vol 2018 ◽  
pp. 1-13
Author(s):  
Manuel Romana ◽  
Marilo Martin-Gasulla ◽  
Ana T. Moreno
Keyword(s):  
Urban Areas ◽  
High Performance ◽  
White Paper ◽  
Future Directions ◽  
Research Directions ◽  
Traffic Volumes ◽  
Primary Means ◽  
The Common ◽  
Rural Access ◽  
Transportation Research

Most of the rural transportation system is composed of two-lane highways, and many of them serve as the primary means for rural access to urban areas and freeways. In some highways, traffic volumes can be not high enough to justify a four-lane highway but higher than can be served by isolated passing lanes, or can present high number of head-on collisions. In those conditions, 2 + 1 highways are potentially applicable. This type of highway is used to provide high-performance highways as intermediate solution between the common two-lane highway and the freeway. Successful experiences reported in Germany, Sweden, Finland, Poland, or Texas (US) may suggest that they are potentially applicable in other countries. The objective of this white paper is to provide an overview of the past practice in 2 + 1 highways and discuss the research directions and challenges in this field, specially focusing on, but not limited to, operational research in association with the activities of the Subcommittee on Two-Lane Highways (AHB40 2.2) of the Transportation Research Board. The significance of this paper is twofold: (1) it provides wider coverage of past 2 + 1 highways design and evaluation, and (2) it discusses future directions of this field.

scholarly journals Podejście zadaniowe (enfoque por tareas) a strategie komunikacyjne w nauczaniu języka hiszpańskiego jako obcego

Neofilolog ◽  
1970 ◽  
pp. 247-256
Author(s):  
Małgorzata Spychała
Keyword(s):  
Language Learners ◽  
Final Section ◽  
Communicative Competence ◽  
Teaching Approach ◽  
Advantages And Disadvantages ◽  
The Common ◽  
Sample Set

The article discusses task-based learning (TBL) in Spanish: enfoque por tareas, which is a teaching approach whose aim is to develop the learner’s communicative competence as well as to help the teacher activate language learners in the classroom – in this case learners of Spanish. The article describes the main objectives of the task and projects defined in the Common European Framework, including the proposed activities designed to fulfill a given task. The final section presents a sample set of lessons following TBL and analyzes the advantages and disadvantages of this approach.

scholarly journals Sonic Logging Vs PIT untuk Mendeteksi Integritas Pondasi Tiang

2011 ◽  
Vol 2 (2) ◽  
pp. 1031
Author(s):  
Gouw Tjie Liong
Keyword(s):  
Basic Theory ◽  
Load Testing ◽  
Destructive Testing ◽  
Pile Capacity ◽  
Advantages And Disadvantages ◽  
Integrity Testing ◽  
First Category ◽  
Sonic Logging ◽  
Second Category ◽  
Pile Integrity

Non destructive testing on piles can be divided into two main categories. The first category is to find out the integrity of the piles, such as pile integrity testing (PIT) and sonic logging. The second category is to find out the pile capacity, such as dynamic load testing/pile driving analysis. Since the early 1990s, the application of the tests was brought into practice and gained its popularity in Indonesia. However, the basic theory behind the testing has not been widely disseminated. This study tries to elaborate the first category of the testing, i.e. the pile integrity testing and sonic logging. The basic theory, the advantages and disadvantages, the application, the limitation and the interpretation of those techniques shall be discussed. Comparison on case studies of those testing methods also shall be given. 

Modes of Ventilation

2019 ◽  
Author(s):  
Michael J Harrison
Keyword(s):  
Respiratory Rate ◽  
Pulmonary Ventilation ◽  
Lung Ventilation ◽  
Intrathoracic Pressure ◽  
Jet Ventilation ◽  
Hemodynamic Stability ◽  
Advantages And Disadvantages ◽  
Basic Parameters ◽  
Anesthesia Machines ◽  
The Common

Lung ventilation is required to maintain oxygenation and eliminate carbon dioxide. The basic parameters of ventilation—tidal volume, respiratory rate, airway resistance, and lung and thoracic compliance—all combine to affect the airway pressure. These parameters, in turn, can affect cardiac output and hemodynamic stability through their effect on intrathoracic pressure and on venous return to the heart. Since the 1950s, many machines have been designed to allow the physician to optimize ventilation. These designs have revolved around three physical variables: volume, pressure, and time. Volume is required to overcome the anatomic respiratory dead space and allows gas exchange in the alveoli. Pressure is required to inflate the elastic system comprising the lungs and thorax, but must also be limited to prevent tissue damage. Time not only determines the respiratory rate but also the rate of flow of gas in and out of the lungs. Many permutations of these basic parameters in anesthesia machines are available today. Knowledge of the common forms of ventilation and their advantages and disadvantages will guide the anesthesiologist in choosing from among these various complex systems. This review contains 5 figures, 3 tables, and 27 references. Key words: CPAP, HFOV, IMV, IPPV, jet ventilation, PEEP, pressure cycled, pulmonary ventilation, SIMV, spontaneous, volume cycled

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