Journal of Jilin University(Engineering and Technology Edition) ›› 2018, Vol. 48 ›› Issue (6): 1910-1916.doi: 10.13229/j.cnki.jdxbgxb20170681

Previous Articles     Next Articles

Smooth tracking with a kalman filter algorithm for capacitive touch panels

LI Ju-peng1(),ZHANG Zu-cheng1,LI Mo-yu1,MIAO De-fang2   

  1. 1. School of Electronic Information Engineering, Beijing Jiaotong University, Beijing 100044,China
    2. Chipone Technology (Beijing) Co.,Ltd., Beijing 100088,China
  • Received:2017-06-30 Online:2018-11-20 Published:2018-12-11

RICH HTML

 61   

PDF (PC)

352

Abstract:

Capacitive touch panels (CTPs) have been more popular owing to their excellent interactive performance. However, electronic magnetic interference, display noise and process variation negatively influence the accuracy of predictions of touch positions. A smooth tracking algorithm for capacitance touch panels based on Kalman filter was proposed. The original touch capacitance data and touch noise characteristic were detected using a micro-controller unit and a sensor integrated circuit. Additionally, the noise of touch trajectory was suppressed by Kalman algorithm timely through process model and measurement model of touch trajectory smooth system. Experimental results indicate that the proposed touch trajectory smooth algorithm has better performance compared to the traditional filtering algorithms, and the algorithm can be used to CTP systems.

Key words: information procession technology, capacitive touch panels(CTPs), touch tracking noise, Kalman filter, tracking quality evaluation

CLC Number: 

  • TP319

Fig.1

Signal acquisition system of the capacitive"

Fig.2

Touch tracking including noise of three circles"

Fig.3

Noise characteristics analysis of tracking"

Fig.4

Comparison of results for the three kinds of noises between filtering methods"

Fig.5

Comparison of filtering results"

Table 1

Comparison of performances between different algorithms"

Savg 原轨迹 MAF算法 Wavelet算法 本文算法
轨迹平滑度 计算时间/ms 轨迹平滑度 计算时间/ms 轨迹平滑度 计算时间/ms
T1 2.8211 1.1513 0.0028 4.2714 0.1185 0.3159 0.0049
T2 1.6202 0.4837 0.0096 2.4252 0.2911 0.1322 0.0114
T3 2.0209 0.6081 0.0048 2.6716 0.2173 0.2036 0.0071
T4 1.5286 0.4659 0.0102 2.2643 0.3823 0.1440 0.0145
T5 1.5667 0.5557 0.0059 2.5727 0.2003 0.1768 0.0084
T6 2.9968 1.0294 0.0029 4.8427 0.1147 0.3816 0.0046
T7 1.2842 0.4190 0.0049 2.9810 0.1826 0.1368 0.0066
T8 1.1489 0.3905 0.0059 2.7265 0.1991 0.1290 0.0071
T9 1.2371 0.4342 0.0049 3.1694 0.2223 0.1374 0.0071
T10 1.9440 0.7652 0.0064 4.1793 0.1384 0.2242 0.0103

Table 2

Comparison of performances between algorithms"

轨迹平滑算法 平均平滑度Savg 平均消耗时间/ms
MAF算法 0.6303 0.0059
Wavelet算法 3.2104 0.2067
本文算法 0.1982 0.0082
[1] Krein P T, Meadows R D . The electroquasistatics of the capacitive touch panel[J]. IEEE Transactions on Industry Applications, 1990,26(3):529-534.
doi: 10.1109/28.55954
[2] 詹思维, 魏廷存, 李博 , 等. 投射式电容触摸屏控制芯片设计[J]. 微电子学, 2013,43(3):365-368.
Zhan Si-wei, Wei Yan-cun, Li Bo , et al. Design of control chip for projection type capacitive touch screen[J]. Microelectronics, 2013,43(3):365-368.
[3] Heo S, Ma H Song J , et al. 72dB SNR, 240 Hz frame rate readout IC with differential continuous-mode parallel architecture for larger touch-screen panel applications[J]. IEEE Transactions on Circuits and Systems I: Regular Papers, 2016,63(7):960-971.
doi: 10.1109/TCSI.2016.2553319
[4] Lin Chih-lung, Li Chia-sheng, Chang Yi-ming . Pressure sensitive stylus and algorithm for touch screen panel[J]. Journal of Display Technology, 2013,9(1):17-23.
doi: 10.1109/JDT.2012.2220524
[5] Ragheb A N, Mohamed M G A, Kim H. Differentiator based sensing circuit for efficient noise suppression of projected mutual-capacitance touch screens [C]//International Conference on Electronics, Information, and Communications, Da Nang, Vietnam, 2016: 1-5.
[6] Lee J S, Yeo D H, Kwon H J , et al. An LCD-VCOM-Noise resilient mutual-capacitive touch-sensor IC chip with a low-voltage driving signal[J]. IEEE Sensors Journal, 2015,15(8):4595-4602.
doi: 10.1109/JSEN.2015.2423556
[7] Yeo D H, Kim S H, Noh H K , et al. A SNR-enhanced mutual-capacitive touch-sensor ROIC using an averaging with three specific TX frequencies, a noise memory, and a compact delay compensation circuit[J]. IEEE Sensors Journal, 2016,16(18):6931-6938.
doi: 10.1109/JSEN.2016.2589963
[8] Li B, Wei T C, Wei X M . A touch prediction and window sensing strategy for low-power and low-cost capacitive multi-touch screen systems[J]. IEEE Journal of Display Technology, 2016,12(6):646-657.
doi: 10.1109/JDT.2016.2517094
[9] Gao S, Mclean D, Jackson L . Reduction of noise spikes in touch screen systems by low pass spatial filtering[J]. Journal of Display Technology, 2016,12(9):957-963.
doi: 10.1109/JDT.2016.2550519
[10] Yang J H, Choi J M . Control circuit of touch screen and noise removing method[P]. United States Patent:US20130300690A1, 2012-04-25.
[11] Klein H W . Noise immunity of touch screen devices[R]. San Jose, USA:White Paper, Cypress Semiconductor Corporation, 2013.
[12] Anderson E . Reduce display noise in capacitive touch screens[R]. San Jose, USA:White Paper, Cypress Semiconductor Corporation, 2013.
[13] Won S P, Melek W W, Golnaraghi F . A kalman/particle filter-based position and orientation estimation method using a position sensor/inertial measurement unit hybrid system[J]. IEEE Transactions on Industrial Electronics, 2010,57(5):1787-1798.
doi: 10.1109/TIE.2009.2032431
[14] Li T H S, Su Y T, Liu S H , et al. Dynamic balance control for biped robot walking using sensor fusion, Kalman filter, fuzzy logic[J]. IEEE Transactions on Industrial Electronics, 2012,59(11):4394-4408.
doi: 10.1109/TIE.2011.2175671
[15] Yi Q M, Xie J H, Shi M. The application of an extended Kalman filter in the dynamic positioning system [C]//International Conference on Natural Computation, Fuzzy Systems and Knowledge Discovery, Changsha,China, 2016: 1945-1949.
[16] Wu Y L, Zhang Q, Shen Z P. Kalman filtering with multiplicative and additive noises [C]//World Congress on Intelligent Control and Automation,Guilin,China, 2016: 483-487.
[1] SU Han-song,DAI Zhi-tao,LIU Gao-hua,ZHANG Qian-fang. Saliency region detection combining absorbing Markov chain and manifold ranking [J]. Journal of Jilin University(Engineering and Technology Edition), 2018, 48(6): 1887-1894.
[2] XU Yan,SUN Mei-shuang. Enhancing underwater image based on convolutional neural networks [J]. Journal of Jilin University(Engineering and Technology Edition), 2018, 48(6): 1895-1903.
[3] HUANG Yong,YANG De-yun,QIAO Sai,MU Zhen-guo. Target detecting with conjugate CFAR in VHR SAR image [J]. Journal of Jilin University(Engineering and Technology Edition), 2018, 48(6): 1904-1909.
[4] LU Zhi-jun,ZHONG Chao,WU Jing-yu. Small feature segmentation method for Spaceborne SAR images [J]. Journal of Jilin University(Engineering and Technology Edition), 2018, 48(6): 1925-1930.
[5] TIAN Yan-tao, ZHANG Yu, WANG Xiao-yu, CHEN Hua. Estimation of side-slip angle of electric vehicle based on square-root unscented Kalman filter algorithm [J]. 吉林大学学报(工学版), 2018, 48(3): 845-852.
[6] ZHU Feng, ZHANG Bao, LI Xian-tao, WANG Zheng-xi, ZHANG Shi-tao. Gyro signal processing based on strong tracking Kalman filter [J]. 吉林大学学报(工学版), 2017, 47(6): 1868-1875.
[7] SHAN Ze-biao, LIU Xiao-song, WANG Chun-yang, SHI Yi-ran, SHI Yao-wu. Joint estimation of DOA and Doppler frequency for coherence and/or same-direction signals [J]. 吉林大学学报(工学版), 2017, 47(6): 1949-1956.
[8] LI Jing, ZHANG Jia-xu, ZHANG Yan-hua, CHEN Li-jun. Estimation of vehicle state and parameter based on strong tracking CDKF [J]. 吉林大学学报(工学版), 2017, 47(5): 1329-1335.
[9] LIN Nan, SHI Shu-ming, MA Li, KUI Hai-lin. Road grade estimation with grade change rate information [J]. 吉林大学学报(工学版), 2016, 46(6): 1845-1850.
[10] MO Yuan-fu, YU De-xin, GUO Ya-juan. Wireless channel load prediction algorithm based on grey relation in VANETs [J]. 吉林大学学报(工学版), 2016, 46(5): 1453-1457.
[11] XU Jie, QI Da-wei. Moving target localization based on improved weighted centroid and UKF algorithm [J]. 吉林大学学报(工学版), 2016, 46(4): 1354-1359.
[12] SONG Chuan-xue, XIAO Feng, LIU Si-han, LI Shao-kun, DUAN Liang, PENG Si-lun. State estimation of electric vehicle with in-wheel motors based on UKF [J]. 吉林大学学报(工学版), 2016, 46(2): 333-339.
[13] ZHANG Yong-bo, YI Bo-yu, KANG Long-yun. Novel observer design of permanent magnet synchronous motor for electric vehicles [J]. 吉林大学学报(工学版), 2015, 45(5): 1527-1534.
[14] ZHAO Jian, ZHANG Jin, ZHU Bing. Fuzzy sliding mode traction control based on road friction coefficient estimation [J]. 吉林大学学报(工学版), 2015, 45(4): 1036-1042.
[15] LIU Yu,HE You,WANG Hai-peng,DONG Kai. Augmented target tracking algorithm based on SRCKF for joint estimation of state and sensor systematic error [J]. 吉林大学学报(工学版), 2015, 45(1): 314-321.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] LI Shoutao, LI Yuanchun. Autonomous Mobile Robot Control Algorithm Based on Hierarchical Fuzzy Behaviors in Unknown Environments[J]. 吉林大学学报(工学版), 2005, 35(04): 391 -397 .
[2] Zhang He-sheng, Zhang Yi, Wen Hui-min, Hu Dong-cheng . Estimation approaches of average link travel time using GPS data[J]. 吉林大学学报(工学版), 2007, 37(03): 533 -0537 .
[3] Nie Jian-jun，Du Fa-rong，Gao Feng . Finite time thermodynamics of real combined power cycle operating
between internal combustion engine and Stirling engine with heat leak[J]. 吉林大学学报(工学版), 2007, 37(03): 518 -0523 .
[4] Bao Tie，Liu Shu-fen . Network fault management formal description based on Communication Sequential Processes （CSP）[J]. 吉林大学学报(工学版), 2007, 37(01): 117 -120 .
[5] . [J]. 吉林大学学报(工学版), 2007, 37(06): 1284 -1287 .
[6] Yang Qing-fang, Chen Lin . Division approach of traffic control work zone[J]. 吉林大学学报(工学版), 2006, 36(增刊2): 139 -142 .
[7] Li Cheng, Liu Zhi-hua, Zhang Ping . Analysis on stress and displacement of a composite flywheel composed of twolayer rotor with pre-displacement[J]. 吉林大学学报(工学版), 2007, 37(04): 828 -832 .
[8] Liang Ji-cai, Li Yi, Li Zhong-ran, Zhang Wei, Liu Cheng-de . Numerical simulation of filling process in resin transfer molding for automobile bumper[J]. 吉林大学学报(工学版), 2006, 36(增刊2): 15 -19 .
[9] Shen Chuan-liang，Liu Guo-jun，Dong Jing-shi，Yang Zhi-gang，Cheng Guang-ming . Piezoelectric multi-vibrator and single-chamber pump for precise drug delivery[J]. 吉林大学学报(工学版), 2007, 37(01): 89 -94 .
[10] Peng Ya-ping1，Guo Ying-nan, Huang Wei-jun，Tan Man-zhi，Dong Lei,Wang Zhi-wei . Cyclebycycle variation of ethanol homogeneous
charge compression ignition combustion[J]. 吉林大学学报(工学版), 2007, 37(02): 301 -0306 .
Copyright © Journal of Jilin University(Engineering and Technology Edition), All Rights Reserved.
Tel: +86-431-85095297　Fax: +86-431-85094074　E-mail: xbgxb@jlu.edu.cn
Powered by Beijing Magtech Co. Ltd