步態分析在很多應用中都扮演者一個重要的腳色，像是在病理症狀，身體狀況，醫療分析和運動學等等。從步態分析裡我們得知步伐速度、步伐距離、步伐時間和腳的移動軌跡和角度進而加以觀察一個人的生理資訊，像是腳在受傷前和受傷後的活動角度變化，擁有慢性阻塞性肺病(COPD)的人在步態測試中會有步伐趨緩的情形或者一些運動選手需要記錄自己的運動情形。
在這篇論文裡，我們提出了利用攝影機抓取人體並使用重心和重心到人的輪廓所建立的距離圖進而建立人體的模型包括頭、軀幹上部、軀幹下部、手和腳，並取這七個部分各自的重心當作我們的特徵點。在行走行為中，利用這些特徵點我們可以得到身體部位的角度資訊和步伐資訊去做步態分析，而得知測試者的身體狀況是否有異常。最後我們把演算法放到嵌入式系統搭配攝影機進行步態分析，如同在電腦上處理擁有良好的結果。

The gait analysis always plays an important role in different kinds of applications such as the disease symptoms, health condition, medical analysis, kinesiology and so forth. In the gait analysis, we are able to obtain the information of the pace speed, pace distance, pace period, and the movement track and angle of one's feet in order to observe the physiology of a person. For example, we can make good use of the pace analysis to observe the angle variation of patients' feet before and after the injury, keep pace with situations of slower paces towards those with COPD disease, or record the exercise scenarios of some athletes.

In this paper, we use video cameras to extract the human body outline and take advantage of the outline distance map measured between the gravity center and human body outline to establish the human body model including the head, upper body, lower body, hands and foot. What's more, we take the gravity center of these 7 different parts as our interest points. During the walking behaviour, we can obtain the angle and pace information of body parts to do the pace analysis by using these interest points and know if there is any abnormality for the health condition of subjects. In the end, we do the pace analysis with our proposed algorithm using cameras in the embedded system and receive good experimental results as shown on the C environment.

[1] Y. Wu, and S. Krishnan, ``Statistical Analysis of Gait Rhythm in Patients With Parkinson’s Disease," IEEE Transactions on Neural Systems and Rehabilitation Engineering, vol. 18, no. 2, pp. 150-158, April 2010.
[2] B. R. Celli, ``Pathophysiology of chronic obstructive pulmonary disease," Pulmonary Rehabilitation: Guidekines to Success. 4th. ed. Mosby Elsevier, pp. 18-29, 2009.
[3] L. Ciobanu, D. Pesut, V. Miloskovic, and D. Petrovic, ``Current opinion on the importance of pulmonary rehabilitation in patients with chronic obstructive pulmonary disease," Chinese Medical Journal, pp. 1539-1543, 2007.
[4] J.L. Astephen, K.J. Deluzio, G.E. Caldwell, M.J. Dunbar, C.L. Hubley-Kozey, ``Gait and neuromuscular pattern changes are associated with differences in knee osteoarthritis severity levels," Journal of Biomechanics, vol. 41., no .4 pp. 868–876, 2008.
[5] J. Jankovic, ``Parkinson’s disease: Clinical features and diagnosis," Journal of Neurology, Neurosurgery Psychiatry, vol. 79., no. 4, pp. 368-376, 2008.
[6] G. B. Moody, R. G. Mark, and A. L. Goldberger, ``PhysioNet: A web-based resource for study of physiologic signals," IEEE Engineering in Medicine and Biology Magazine, vol. 20., no. 3, pp. 70-75, May/Jun. 2001.
[7] Hooman Dejnabadi, Brigitte M. Jolles, and Kamiar Aminian, ``A New Approach for Quantitative Analysis of Inter-Joint Coordination During Gait," IEEE Transactions on Biomedical Engineering, vol. 55, no. 2, pp. 755-763, Feb. 2008.
[8] H. Lakany, ``Extracting a diagnostic gait signature," Pattern Recognition, pp. 1627-1637, 2008.
[9] Susu Jiang, Bofeng Zhang, Guobing Zou, and Daming Wei, ``The possibility of normal gait analysis based on a smart phone for healthcare," IEEE International Conference on Green Computing and Communications and IEEE Internet of Things and IEEE Cyber,Physical and Social Computing, pp. 2235 - 2240, Aug. 2013
[10] Cong Zong, Xavier Clady, Joseph Salini and Mohamed Chetouani, ``An embedded 3D human motion capture using the prediction provided from a walking model," The Fourth IEEE RAS/EMBS International Conference
on Biomedical Robotics and Biomechatronics, pp. 1740 - 1746, June. 2012
[11] Rafael G. Gonzalez; Richard E. Woods,``Digital image processing," 3rd., Addison-Wesley, 2010
[12] Chien, S.Y., Ma, S.Y., Chen, L.G.,``Partial-result-reuse architecture and its design technique for morphological operations with flat structuring elements," IEEE Trans. Circuits Syst. Video Technol, vol. 15, pp. 1156–1169, Sept. 2005
[13] Olivier Déforges, Nicolas Normand, Marie Babel,``Fast recursive grayscale morphology operators: from the algorithm to the pipeline architecture," Journal of Real-Time Image Processing, vol. 8, pp. 143-152, June. 2013
[14] Stamatakis, J., Cremers, J., Maquet, D., Macq, B., Garraux, G.``Gait feature extraction in Parkinson's disease using low-cost accelerometers," 2011 Annual International Conference of the IEEE onEngineering in Medicine and Biology Society(EMBC),pp. 7900 - 7903, Aug. 30 2011-Sept. 3 2011
[15] Tien, I., Glaser, S.D., Aminoff, M.J.``Characterization of gait abnormalities in Parkinson's disease using a wireless inertial sensor system," 2010 Annual International Conference of the IEEE on Engineering in Medicine and Biology Society(EMBC), pp. 3353 - 3356, Aug. 31 2010-Sept. 4 2010
[16] Long Wen , Jinwu Qian, Xiaowu Hu, Linyong Shen, Xi Wu, Changlin Yu,``Gait measurement and quantitative analysis in patients with Parkinson's disease for rehabilitation assessment," 2010 Annual International Conference of the IEEE on Engineering in Medicine and Biology Society (EMBC), pp. 286 - 291, 12-14 Dec. 2013
[17] Wahab, Y., Bakar, N.A.,``Gait analysis measurement for sport application based on ultrasonic system,"2011 IEEE 15th International Symposium on Consumer Electronics (ISCE), pp. 20 - 24, 14-17 June 2011
[18] Alahakone, A.U. , Senanayake, S.M.N.A., Senanayake, C.M.,``Smart wearable device for real time gait event detection during running," 2010 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS), pp. 612 - 615, 6-9 Dec. 2010
[19] Liu, T.,Inoue, Y., Shibata, K., Hirota, Y., Shiojima, K``A mobile force plate system and its application to quantitative evaluation of normal and pathological gait," 2010 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM), pp. 272 - 277, 6-9 July 2010
[20] Olivier Déforges, Nicolas Normand, Marie Babel,``Wearable wireless sensor for the gait monitorization of Parkinsonian patients," 16th IEEE International Conference on Electronics, Circuits, and Systems, 2009, pp. 215 - 218, 13-16 Dec. 2009
[21] Chan, H., Huiru Zheng, Haiying Wang, Sterritt, R., Newell, D.,``Smart mobile phone based gait assessment of patients with low back pain," 2013 Ninth International Conference on Natural Computation (ICNC), pp. 1062 - 1066, 23-25 July 2013
[22] Susu Jiang, Bofeng Zhang, Guobing Zou, Daming Wei,``The Possibility of Normal Gait Analysis Based on a Smart Phone for Healthcare," Green Computing and Communications (GreenCom), 2013 IEEE and Internet of Things (iThings/CPSCom), IEEE International Conference on and IEEE Cyber, Physical and Social Computing, pp. 2235 - 2240, 20-23 Aug. 2013
[23] Geman, O. ,``Data processing for Parkinson's disease: Tremor, speech and gait signal analysis," 2011 E-Health and Bioengineering Conference (EHB), pp. 1-4, 24-26 Nov. 2011
[24] SU, Y.,Atallah, Louism, Lo, Benny, Yang, Guang-Zhong.,``Gait and Balance Analysis for Patients with Alzheimer’s Disease Using an Inertial-Sensor-Based Wearable Instrument,"IEEE Journal of Biomedical and Health Informatics, pp. 1, June. 2011
[25] Li, Ling .,Chung, P., Wang, W., Pai, M.,Wang, C., Lin, C., Wu, H., Wang, J.``Feature extraction from ear-worn sensor data for gait analysis,"2014 IEEE-EMBS International Conference on Biomedical and Health Informatics (BHI), pp. 560 - 563, 1-4 June 2014
[26] Hyo-Seon Jeon, Jonghee Han, Won-Jin Yi, Jeon, BeomSeok, Kwang Suk Park.,``Classification of Parkinson gait and normal gait using Spatial-Temporal Image of Plantar pressure," 30th Annual International Conference of the IEEE on Engineering in Medicine and Biology Society, 2008, pp. 4672 - 4675, 20-25 Aug. 2008
[27] Meng-Fen Ho, Ke-Zen Chen, Chung-Lin Huang,``Gait analysis for human walking paths and identities recognition," IEEE International Conference on Multimedia and Expo, 2009}, pp. 1054 - 1057, June 28 2009-July 3 2009
[28] Doheny, E.P.,Foran, T.G., Greene, B.R.,``A single gyroscope method for spatial gait analysis," 2010 Annual International Conference of the IEEE on 2010 Annual International Conference of the IEEE, pp. 1300 - 1303, Aug. 31 2010-Sept. 4 2010
[29] Gafurov, D.,``Security Analysis of Impostor Attempts with Respect to Gender in Gait Biometrics,"First IEEE International Conference on Biometrics: Theory, Applications, and Systems, 2007, pp. 1-6, 27-29 Sept. 2007
[30] Desseree-Calais, E.F.,Legrand, L.R.,``First Results of a Complete Marker-Free Methodology for Human Gait Analysis," 27th Annual International Conference of the Engineering in Medicine and Biology Society, 2005, pp. 7455 - 7458, 17-18 Jan. 2006