Journal of Shanghai Jiaotong University ›› 2013, Vol. 47 ›› Issue (04): 589-593.

• Automation Technique, Computer Technology • Previous Articles     Next Articles

Visual Force Measurement Using Pseudo Zernike Moment Invariants

HU  Wen-1, LIU  Hong-Tao-1, HU  Chun-2, FAN  Ming-Xia-3, MO  Jin-Qiu-1, WANG  Shi-Gang-1   

  1. (1. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China;2. Center for Educational Technology, Jiangxi Science and Technology Normal University, Nanchang 330013, China; 3. Shanghai Key Lab. of Magnetic Resonance, East China Normal University, Shanghai 200062, China)
  • Received:2012-06-05 Online:2013-04-28 Published:2013-04-28

Abstract:  A new visual force measurement method was proposed to measure applied forces through analyzing pseudo Zernike moment invariants. First, a feature vector of pseudo Zernike moment invariants is used to describe the deformed microgripper shape in microassembly. This description indicates a function between the applied force and the feature vector of moment invariants. Then, a training set is established, where the input and the output represent the feature vector of moment invariants and the corresponding known applied force, respectively. Finally, a support vector machine (SVM) compares the feature vectors in the testing set with those ones in the training set, implements multiclass classification and estimates unknown applied forces in the testing set. The experiments on four different microcantilevers validate the proposed method.  

Key words: visual force measurement, pseudo Zernike moment invariants, support vector machine, multi-class classification

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