Improvements of Infrared Touch Screen Calibration Algorithm Based on Affine Transformation

2014 ◽  
Vol 716-717 ◽  
pp. 1341-1345
Author(s):  
Wen Ming Guo ◽  
Gang Wang
Keyword(s):  
Affine Transformation ◽  
Touch Screen ◽  
The Other ◽  
Pass Rate ◽  
Sample Point ◽  
Affine Transform ◽  
Calibration Algorithm ◽  
Windows 8

Because the affine transformation can realize the coordinate translation, rotation, scaling, it is applied to calibrate the touch screen. But,requirements for touch errors of Windows 8 is ±0.5mm,and the pass rate of sample point must reach 4%.Therefore, simply use the method of draw-point to collect the sample point has been unable to meet the requirement of accuracy. This paper tries to propose two improved calibration algorithm based on affine transform, one method use drawing lines instead of marking point, the other devides the screen into a plurality of areas to use multiple calibration. This two kind of methods can effectively improve the calibration precision.

scholarly journals GEOMETRY AND TEXTURE MEASURES FOR INTERACTIVE VIRTUALIZED REALITY INDOOR MODELER

2015 ◽  
Vol XL-4/W5 ◽  
pp. 43-48 ◽  
Author(s):  
K. Thangamania ◽  
R. Ichikari ◽  
T. Okuma ◽  
T. Ishikawa ◽  
T. Kurata
Keyword(s):  
Affine Transformation ◽  
Indoor Environment ◽  
Texture Mapping ◽  
Labor Cost ◽  
Single Image ◽  
Prototype Implementation ◽  
Affine Transform ◽  
Multiple View ◽  
Shape From Texture

This paper discusses the algorithm to detect the distorted textures in the virtualized reality indoor models and automatically generate the necessary 3D planes to hold the undistorted textures. Virtualized reality (VR) interactive indoor modeler, our previous contribution enables the user to interactively create their desired indoor VR model from a single 2D image. The interactive modeler uses the projective texture mapping for mapping the textures over the manually created 3D planes. If the user has not created the necessary 3D planes, then the texture that belong to various objects are projected to the available 3D planes, which leads to the presence of distorted textures. In this paper, those distorted textures are detected automatically by the suitable principles from the shape from texture research. The texture distortion features such as the slant, tilt and the curvature parameters are calculated from the 2D image by means of affine transformation measured between the neighboring texture patches within the single image. This kind of affine transform calculation from a single image is useful in the case of deficient multiple view images. The usage of superpixels in clustering the textures corresponding to different objects, reduces the modeling labor cost. A standby database also stores the repeated basic textures that are found in the indoor model, and provides texture choices for the distorted floor, wall and other regions. Finally, this paper documents the prototype implementation and experiments with the automatic 3D plane creation and distortion detection with the above mentioned principles in the virtualized reality indoor environment.

3D Animated Movies, Touch Screen Applications and Visual Motor Development of Five-Year-Old Children

2019 ◽  
pp. 787-796
Author(s):  
Seçil Yücelyiğit ◽  
Neriman Aral
Keyword(s):  
Motor Skills ◽  
Motor Development ◽  
Preschool Education ◽  
Touch Screen ◽  
The Other ◽  
Control Group ◽  
Interactive Applications ◽  
Visual Motor ◽  
And Control ◽  
Research Show

This study is implemented to investigate the effects of 3D animated movies and interactive applications on visual motor development of five year old children. The research has been performed in pretest-posttest-permanence test, experimental pattern with control group. For four months, every fifteen day experimental groups (24 children) watched eight episodes of 3D animated movies; 12 of them performed the interactive applications with computer while the other 12 performed the same applications with worksheets. 14 children in control group engaged merely their preschool education. Test of Visual Motor Skills-3 was used to collect and evaluate the visual motor skills of children. Since the data of the research was not distributed normally, non-parametric Kruskal Wallis, Friedman and Wilcoxon tests were used to analyze the data. The results of the research show that the visual motor skills of children who engaged the study in both test and control groups, had improved significantly.

Study on Calibration Algorithm of Embedded Touch Screen

2014 ◽  
Vol 9 (4) ◽  
Author(s):  
Ping-yong Li ◽  
Zhong-wen Li
Keyword(s):  
Touch Screen ◽  
Calibration Algorithm

Research on Multi-Point Calibration and Touch Pressure of Touch-Screen

2012 ◽  
Vol 198-199 ◽  
pp. 1290-1293 ◽  
Author(s):  
Xiu Hong Jiang ◽  
Fu Hai Duan ◽  
Rui Guo
Keyword(s):  
Touch Screen ◽  
Test Results ◽  
Pressure Threshold ◽  
Calibration Algorithm ◽  
Point Set ◽  
Two Measures ◽  
Target Environment ◽  
Low Sensitivity ◽  
Coordinate Conversion ◽  
Calibration Coefficients

In view of the inaccuracy and low sensitivity of resistive touch-screen in small point target environment, two measures were proposed. First, based on the existing three-point calibration algorithm, more points were sampled to improve coordinate conversion precision, greedy algorithmm reduced the random calibration point set, and least squares algorithm fit the final calibration coefficients. Another measure was to utilize the touch pressure measurement and pressure threshold decision to remove invalid click. Finally, test results show that multi-point calibration with greedy algorithm can improve the precision of coordinate calibration, and the adoption of pressure decision can effectively enhance the system’s adaptability to touch intensity.

Research and Test on User Privilege Elevation Method in Windows 8

2014 ◽  
Vol 610 ◽  
pp. 752-755
Author(s):  
Jiang Du ◽  
Hao Wang ◽  
Jia Yu Yang
Keyword(s):  
Operating System ◽  
Control System ◽  
User Interface ◽  
System Security ◽  
The Other ◽  
Privilege Management ◽  
Interface Function ◽  
Operating System Security ◽  
Windows 8

Windows 8 is the latest release of Microsoft operating system, the user interface, function and safety have been greatly improved. The user privilege has played a part in operating system security, which can greatly prevent worm programs. The Windows 8 privilege management inherits from Windows Vista’s UAC (User Account Control) system and improved it. Now there are two types of method to elevate user privilege, one is aim at the UAC in Ring 3 mode, the other is attack the kernel of operating system in Ring 0 mode. This paper is primarily analyzing and testing these methods.

Design of Resistance Touch Screen Based on S3C6410 Embedded System

2014 ◽  
Vol 556-562 ◽  
pp. 1491-1494 ◽  
Author(s):  
Ying Wang ◽  
Ri Bo Ge ◽  
Mei Hua Li
Keyword(s):  
Embedded System ◽  
Touch Screen ◽  
Sampled Data ◽  
Algorithm Optimization ◽  
Filtration Method ◽  
Point Mapping ◽  
Practical Applications ◽  
Calibration Algorithm ◽  
Point To Point ◽  
Selection Of

This design uses Samsung ARM11 S3C6410 microprocessor and 4 wires resistive touch screen as the hardware foundation. Based on the hardware structure, the touch screen application is developed. System performance has been improved by means of the algorithm optimization of the sampled data and software filtration method, and lead to a strong practicability. In the end, three-point calibration algorithm is introduced for the offset problem of the screen coordinates, then the calibration matrix is decided by the selection of three-point, and then using software implementation to realize the calibration of point-to-point mapping relation, and finally make it more accurate in practical applications.

scholarly journals CPIRD: A successful Thai programme to produce clinically competent medical graduates

F1000Research ◽  
2015 ◽  
Vol 4 ◽  
pp. 158
Author(s):  
Yi Yanhua ◽  
Virasakdi Chongsuvivatwong ◽  
Hutcha Sriplung ◽  
Chulalak Rueanarong
Keyword(s):  
Estimating Equation ◽  
The Other ◽  
Pass Rate ◽  
Pass Rates ◽  
Chi Square ◽  
Grade Point ◽  
National Medical ◽  
Medical Study ◽  
Significant Difference ◽  
Medical License

The programme titled “Collaborative Project to Increase Production of Rural Doctors” (CPIRD) is a rural medical education project launched in 1994 in Thailand. This study aimed to compare the academic performances in medical study over five years and the pass rates in national medical license examinations (MLE) between students enrolled in CPIRD and two other tracks.Grade point average (GPA) over five years and results of MLEs for four cohorts of students enrolled from 2003 to 2006 in Prince of Songkla University were collected from the registration department. A longitudinal analysis was used to compare the GPA over time for medical students enrolled in CPIRD and those from the national and direct regional tracks through generalized estimating equation (GEE) models. The MLE pass rates were compared using chi-square and fisher's exact tests as appropriate.Female students dominated the CPIRD group. GPAs in the first three years in the CPIRD group were significantly lower than those of the other two groups, this disparity narrowed in the fourth and fifth years. For step one of the MLE (basic sciences), cohorts 2003 and 2006 of the CPIRD group had a significantly lower pass rate than the other two groups but there was no significant difference in cohort 2004 and cohort 2005. The CPIRD step two and three MLE pass rates were not significantly different from the national track in all cohorts and lower than the direct track only for step two in cohort 2003 and step three in cohort 2006. The step three pass rate of the CPIRD group in cohort 2004 was significantly higher than the other two tracks.Despite weaker competency in basic science, the CPIRD was successful in forming clinical competency.

scholarly journals Touch-screen-guided task reveals a prosocial choice tendency by chimpanzees (Pan troglodytes)

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5315 ◽  
Author(s):  
Renata S. Mendonça ◽  
Christoph D. Dahl ◽  
Susana Carvalho ◽  
Tetsuro Matsuzawa ◽  
Ikuma Adachi
Keyword(s):  
Pan Troglodytes ◽  
Touch Screen ◽  
The Other ◽  
Chance Level ◽  
Direct Benefit ◽  
Experimental Control ◽  
Self And Other

Humans help others even without direct benefit for themselves. However, the nature of altruistic (i.e., only the other benefits) and prosocial (i.e., self and other both benefit) behaviors in our closest living relative, the chimpanzee, remains controversial. To address this further, we developed a touch-screen-guided task that allowed us to increase the number of trials for a thorough test of chimpanzees’ prosocial and altruistic tendencies. Mother-offspring dyads were tested in the same compartment; one was the actor while the other was the recipient. In Experiment 1, the actor chose among three options: prosocial, selfish (only the actor benefited) and altruistic. To better understand the nature of the chimpanzees’ choices and to improve experimental control, we conducted two additional experiments. Experiment 2 consisted of two-option choices interspersed with three-option choices, and in Experiment 3 the two-option choice were blocked across all trials. The results of Experiment 1 clearly showed that chimpanzees acted prosocially in the touch-screen-guided task, choosing the prosocial option on an average of 79% of choices. Five out of the six chimpanzees showed the preference to act prosocially against chance level. The preference for the prosocial option persisted when conditions were changed in Experiments 2 and 3. When only selfish and altruistic options were available in Experiments 2 and 3, chimpanzees preferred the selfish option. These results suggest that (1) most individuals understood the nature of the task and modified their behavior according to the available options, (2) five out of the six chimpanzees chose to act prosocially when they had the option to, and (3) offspring counterbalanced between altruistic and selfish, when given those two options perhaps to avoid suffering repercussions from the mother.

scholarly journals Affine Transformation for Landmark Based Registration Initializer in ITK

2011 ◽  
Author(s):  
Eun young Kim ◽  
Hans Johnson ◽  
Norman Williams
Keyword(s):  
Affine Transformation ◽  
Linear Equations ◽  
Affine Transform ◽  
Transformation Algorithm

This document describes an affine transformation algorithm as an additional feature for landmark based registration in ITK www.itk.org. The algorithm is based on the paper by Spath, H [1]. The author derives a set of linear equations from paired landmarks and generates an affine transform from them. The method implemented here gives more freedom in the choice of registration and/or initialization method in ITK. The submission describes ITK implementation of the algorithm.

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