Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (2): 121-125.doi: 10.3969/j.issn.1000-565X.2010.02.023

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Detection Model of Geometric Shape of Lip Based on PS-Level Set

Feng Xiao-hui   He Qian-hua   Wang Wei-ning   Yan Le-pin   

  1. School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2009-02-12 Revised:2009-03-18 Online:2010-02-25 Published:2010-02-25
  • Contact: 贺前华（1965-），男，教授，博士生导师，主要从事语音识别及合成技术、音视频信号处理、模式识别等研究E—mail：eehe@seut．edu．cn E-mail:xh．feng@mail．scut．edu．cn
  • About author:奉小慧（1981-），女，博士生，主要从事音视频语音处理、口语语音识别、模式识别等研究．
  • Supported by:

    国家自然科学基金资助项目（60572141,60602014）

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Abstract:

In order to overcome the overconvergence and the premature convergence of lip boundary caused by the level set model for geometric shape detection, an improved level set model based on the prior shape （ PS-Level Set） is proposed. In this model, the prior shape information of lip is incorporated into an improved differential energy function, and the differences between the evolution shape curve and the prior shape curve are repeatedly compared during the curve-evolving process, which enables the evolution shape to gradually approach the prior one and to converge to the target object more accurately. Experimental results show that, as compared with the conventional level set model, the proposed model improves the detection accuracy by 8.38%.

Key words: lip reading, shape detection, level set model, curve evolution