Dynamic Template Tracking System with Application to the Detection of the Railway Spike Defects

2013 ◽  
Vol 846-847 ◽  
pp. 1124-1128
Author(s):  
Rong Hu ◽  
Xiao Qing Luo
Keyword(s):  
Tracking System ◽  
Complex Function ◽  
Correlation Coefficients ◽  
Matching Function ◽  
Point Multiplication ◽  
Computation Efficiency ◽  
Traditional Algorithm ◽  
Point To Point ◽  
Real Time Identification ◽  
Dynamic Template

This paper presents a novel correlation-based tracking algorithm, which is a generalization of the dynamic template correlation regional tracking (DTCRT) algorithmthe template is dynamic and the correlation is regional, and in particular the target image quality is not always good. The algorithm does not make use of the point-to-point multiplication and then summarizing as the traditional algorithm does. Instead, the DTCRT algorithm introduced. This fact helps to overcome several shortcomings of the point-to-point multiplication and then summarizing. The target is represented by the correlation coefficients. If the correlation coefficient is less than a threshold one can judge then the spike is defected. Since the matching function is a very complex function, the DTCRT algorithm is used to optimize it. Experiments demonstrate the effectiveness, significance and computation efficiency of the proposed railway spike tracking method in real-time identification.

The relationship between physical match performance and 48-h post-game creatine kinase concentrations in English Premier League soccer players

2016 ◽  
Vol 11 (6) ◽  
pp. 846-852 ◽  
Author(s):  
A Scott ◽  
JJ Malone ◽  
R Morgans ◽  
D Burgess ◽  
W Gregson ◽  
...  
Keyword(s):  
Creatine Kinase ◽  
Tracking System ◽  
Correlation Coefficients ◽  
Soccer Players ◽  
Large Individual ◽  
Premier League ◽  
Coaching Process ◽  
The Relationship ◽  
English Premier League ◽  
Physical Match

The aim of the investigation was to determine the relationship between blood creatine kinase and physical match performance in 15 elite male soccer players competing in the English Premier League. Blood samples were collected 48 h following a competitive match and analysed for creatine kinase concentration immediately after collection. Physical match performance data were collected using a computerised tracking system (Prozone®) from >6 matches for each player. Mean ± S.D creatine kinase concentration 48 h post-match was 520 ± 224 µ.mol.l−1. Large individual variation in creatine kinase response at this time point was observed (184 µ.mol.l−1 to 1573 µ.mol.l−1). No significant correlation coefficients were observed between the chosen indicators of physical match performance and creatine kinase concentration 48 h post-match. These data suggest that creatine kinase concentrations are elevated as a consequence of playing a soccer match. Creatine kinase may also be of limited value in supporting important decisions in the coaching process.

scholarly journals Study on Electric-Magnetic-Acoustic Signal Regularity and Its Correlation during Rock Shear Failure

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Huilin Jia ◽  
Yue Niu ◽  
Xiaofei Liu ◽  
Enyuan Wang
Keyword(s):  
Acoustic Signal ◽  
Damage Evolution ◽  
Shear Failure ◽  
Tracking System ◽  
Correlation Coefficients ◽  
Coupling Model ◽  
Electric Signal ◽  
Rock Materials ◽  
Coal Rock ◽  
Electric Signals

http://mts.hindawi.com/update/) in our Manuscript Tracking System and after you have logged in click on the ORCID link at the top of the page. This link will take you to the ORCID website where you will be able to create an account for yourself. Once you have done so, your new ORCID will be saved in our Manuscript Tracking System automatically."?>During mining activities, the deformation and damage of coal rock materials might result in coal rock dynamic disasters, such as rock burst. It leads to serious casualties and property losses. Generally, the occurrence of dynamic failure of coal and rock are caused by shear failure of coal seam. Geophysics signals are generated and related to damage evolution in this loading process. In this paper, sandstone samples were subjected to shear failure laboratory experiments, and the electric-magnetic-acoustic signal regularity was measured and analyzed comparatively. The results indicated magnetic signals were more correlated with stress and acoustic emission (AE) signals, while the amplitude of electric signal fluctuation was larger when main failure occurred. With the increase of sample size and shear strength, the strength of electric-magnetic-acoustic signals increased. The correlation coefficients between the magnetic signal and stress as well as AE energy were superior to those of electric signals. The coupling model between AE and electric signals was established, which shows good statistical correlation. This study lays the foundations for further interpreting the generation mechanism of the electric signal. It provides a new method to indicate the damage evolution of coal rock materials.

An Improved Algorithm of Improved Computation Efficiency on LTS Hausdorff Distance

2013 ◽  
Vol 347-350 ◽  
pp. 3217-3221
Author(s):  
Hui Wang ◽  
Guo Jia Li ◽  
Jun Hui Pan ◽  
Fu Hua Shang
Keyword(s):  
Hausdorff Distance ◽  
Curve Segment ◽  
Original Algorithm ◽  
Search Path ◽  
Computation Efficiency ◽  
Traditional Algorithm ◽  
Better Than ◽  
Improved Algorithm

The computation efficiency of traditional algorithm is not high, and there is more time consuming. This paper presents an effective method for improved hausdorff distance, depth correction of logging curves is based on improved Hausdorff distance. In this method. On the basis of existing LTS hausdorff distance, the contrast curve segment is divided into neighborhood in an area, the LTS hausdorff distance is calculated by using engineering approximate, and the improving methods of search path is put forward, which ensures that the improved algorithm is better than the original algorithm has high computing efficiency and accuracy in theory.

scholarly journals Detecting Diabetic Retinal Neuropathy Using Fundus Perimetry

2021 ◽  
Vol 22 (19) ◽  
pp. 10726
Author(s):  
Takayuki Baba
Keyword(s):  
Diabetic Retinopathy ◽  
Neuronal Damage ◽  
Morphological Changes ◽  
Tracking System ◽  
Treatment Modalities ◽  
Retinal Sensitivity ◽  
High Background ◽  
Vascular Abnormalities ◽  
Wide Range ◽  
Point To Point

Fundus perimetry is a new technique for evaluating the light sense in the retina in a point-to-point manner. Light sense is fundamentally different from visual acuity, which measures the threshold for discriminating and perceiving two points or lines, called the minimum cognoscible. The quality of measurement of retinal sensitivity has dramatically increased in the last decade, and the use of fundus perimetry is now gaining popularity. The latest model of fundus perimetry, MP-3, can be used for a wide range of measurements and has an advanced eye tracking system. High background illumination enables accurate measurement of mesopic retail sensitivity. Recent investigations have shown that neuronal damage precedes vascular abnormalities in diabetic retinopathy. The loss of retinal function has also been reported prior to morphological changes in the retina. In this review, the importance of measuring retinal sensitivity to evaluate visual function in the early stages of diabetic retinopathy was discussed. The usefulness of retinal sensitivity as an outcome measure in clinical trials for treatment modalities is also presented. The importance of fundus perimetry is promising and should be considered by both diabetes researchers and clinical ophthalmologists.

scholarly journals Integrating video tracking and GPS to quantify accelerations and decelerations in elite soccer

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Eduard Pons ◽  
Tomás García-Calvo ◽  
Francesc Cos ◽  
Ricardo Resta ◽  
Hugo Blanco ◽  
...  
Keyword(s):  
Tracking System ◽  
Correlation Coefficients ◽  
Video Tracking ◽  
Descriptive Statistics ◽  
Intra Class Correlation ◽  
Professional Soccer ◽  
Coefficients Of Variation ◽  
Acceleration And Deceleration ◽  
Negative Relationships ◽  
Video Tracking System

AbstractThe aim of this study was to analyze the degree of agreement comparing number and distance covered in different acceleration and deceleration sections registered by a video tracking system (MEDIACOACH) and a GPS device (WIMU PRO) during official competition. Data from a Spanish professional club were registered over the course of a season. First, the descriptive statistics presented more bursts of accelerations and decelerations in WIMU PRO than in MEDIACOACH, whereas the distances covered recorded by both systems were similar. Second, negative relationships were found (i.e., negative bias) comparing WIMU PRO to MEDIACOACH in the number of accelerations and decelerations between 0/1 m/s2 and ½ m/s2 (p < 0.05), and in the distances covered in accelerations and decelerations (p < 0.05) between 0/1 m/s2 and in accelerations and decelerations registered between 2/3 m/s2 and more than 3 m/s2. Moreover, the differences in means (i.e., standardized mean bias) across the two devices were trivial (> 0.19) and small (0.2–0.59) for most variables. The standardized typical errors in the estimate (TEE) were moderate (0.3–0.59) and small to moderate (0.1–0.29 to 0.3–0.59), respectively. Also, the Intra class Correlation Coefficients (ICCs) for agreement and consistency between systems showed good and excellent values (> 0.90). The magnitude of change in means (%) between systems, defined as the percentage change between the numbers or values, was below 14% and 7% for number and distances covered, respectively. All scores in the smallest worthwhile change were lower than 9% and in the coefficients of variation were lower than 95% and 15%, respectively. Thus, both systems demonstrated an acceptable degree of agreement and could be useful in analyzing players’ acceleration demands in professional soccer. However, caution is required when interpreting the results and a comparison with a gold standard is required in order to validate both systems.

scholarly journals Portable, open-source solutions for estimating wrist position during reaching in people with stroke

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jeffrey Z. Nie ◽  
James W. Nie ◽  
Na-Teng Hung ◽  
R. James Cotton ◽  
Marc W. Slutzky
Keyword(s):  
Open Source ◽  
Tracking System ◽  
Wearable Sensors ◽  
Correlation Coefficients ◽  
Arm Movement ◽  
Optical Tracking ◽  
Optical Tracking System ◽  
Reaching Task ◽  
Rehabilitation Outcomes ◽  
Wrist Position

AbstractArm movement kinematics may provide a more sensitive way to assess neurorehabilitation outcomes than existing metrics. However, measuring arm kinematics in people with stroke can be challenging for traditional optical tracking systems due to non-ideal environments, expense, and difficulty performing required calibration. Here, we present two open-source methods, one using inertial measurement units (IMUs) and another using virtual reality (Vive) sensors, for accurate measurements of wrist position with respect to the shoulder during reaching movements in people with stroke. We assessed the accuracy of each method during a 3D reaching task. We also demonstrated each method’s ability to track two metrics derived from kinematics-sweep area and smoothness-in people with chronic stroke. We computed correlation coefficients between the kinematics estimated by each method when appropriate. Compared to a traditional optical tracking system, both methods accurately tracked the wrist during reaching, with mean signed errors of 0.09 ± 1.81 cm and 0.48 ± 1.58 cm for the IMUs and Vive, respectively. Furthermore, both methods’ estimated kinematics were highly correlated with each other (p < 0.01). By using relatively inexpensive wearable sensors, these methods may be useful for developing kinematic metrics to evaluate stroke rehabilitation outcomes in both laboratory and clinical environments.

scholarly journals Performance behavior of prediction filters for respiratory motion compensation in radiotherapy

2017 ◽  
Vol 3 (2) ◽  
pp. 429-432
Author(s):  
Alexander Jöhl ◽  
Yannick Berdou ◽  
Matthias Guckenberger ◽  
Stephan Klöck ◽  
Mirko Meboldt ◽  
...  
Keyword(s):  
Time Delays ◽  
Tracking System ◽  
Correlation Coefficients ◽  
Support Vector ◽  
Linear Filter ◽  
Good Prediction ◽  
Local Regression ◽  
The Neural Network ◽  
Mitigation Methods ◽  
Performance Behavior

AbstractIntroduction: In radiotherapy, tumors may move due to the patient’s respiration, which decreases treatment accuracy. Some motion mitigation methods require measuring the tumor position during treatment. Current available sensors often suffer from time delays, which degrade the motion mitigation performance. However, the tumor motion is often periodic and continuous, which allows predicting the motion ahead. Method and Materials: A couch tracking system was simulated in MATLAB and five prediction filters selected from literature were implemented and tested on 51 respiration signals (median length: 103 s). The five filters were the linear filter (LF), the local regression (LOESS), the neural network (NN), the support vector regression (SVR), and the wavelet least mean squares (wLMS). The time delay to compensate was 320 ms. The normalized root mean square error (nRMSE) was calculated for all prediction filters and respiration signals. The correlation coefficients between the nRMSE of the prediction filters were computed. Results: The prediction filters were grouped into a low and a high nRMSE group. The low nRMSE group consisted of the LF, the NN, and the wLMS with a median nRMSE of 0.14, 0.15, and 0.14, respectively. The high nRMSE group consisted of the LOESS and the SVR with both a median nRMSE of 0.34. The correlations between the low nRMSE filters were above 0.87 and between the high nRMSE filters it was 0.64. Conclusion: The low nRMSE prediction filters not only have similar median nRMSEs but also similar nRMSEs for the same respiration signals as the high correlation shows. Therefore, good prediction filters perform similarly for identical respiration patterns, which might indicate a minimally achievable nRMSE for a given respiration pattern.

Calibration Device Development for Spherical Solar Radiation Sensors

2015 ◽  
Vol 4 (2) ◽  
pp. 371-376 ◽  
Author(s):  
Tadashi Takakura ◽  
Morikuni Miyahira ◽  
Maro Tamaki ◽  
Masako Akutsu ◽  
Takae Usui ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Tracking System ◽  
Correlation Coefficients ◽  
Similar Data ◽  
Disk System ◽  
Spherical Type ◽  
Flat Type ◽  
Declination Angle ◽  
Calibration Device ◽  
Radiation Sensors

Measuring the solar radiation received by a plant canopy is necessary to analyze its physiological aspects. A spherical photodiode has been developed for this purpose. However, a horizontally set calibrated solarimeter using a flat type sensor cannot be used for calibration because it must remain unaffected by the cosine law. Therefore, an inexpensive automatic tracking solar disk system has been developed for the calibration of a spherical type solarimeter. A calibrated solarimeter was mounted on the tracking system and was inclined according to the altitude and the declination angle of the location on the day of the experiment. The system calibrated all four spherical solarimeters with high correlation coefficients . Some data exceed the so-called solar constant, which is measured similarly, but outside of the earth atmospheric layer because the device developed this time measured hemispherical solar radiation normal to the sun disk. Similar data were reported even from horizontal measurements.

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