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| Gait Recognition Based on Shape Context Descriptor |
| CHEN Shi1, MA TianJun1, HUANG WanHong2, GAO YouXing1 |
1.Computer Peripheral Institute, Xidian University, Xi’an 710071
2.Document and Information Center, Zhejiang Wanli University, Ningbo 315100 |
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Abstract A method for gait recognition using human silhouette analysis is proposed. For each image sequence, the binary silhouettes of a walking figure are firstly obtained by background subtraction. An intensity difference algorithm over all color channels is introduced for shadow removal. The shape context descriptors are then employed in silhouette analysis for providing the shape feature. Modified Hausdorff distance gives an idea of the similarity measure between feature vectors of silhouettes. A set of key stances that occur during the walk cycle of an individual is chosen. Combined with window shift technology, distances of silhouettes between key stance sets are computed for subject classification and recognition. The proposed approach is applied to CASIA gait database and Soton database. The correct classification rates of 91.25% and 86.97% are achieved respectively, which illustrate that the proposed method outperforms the existing methods. Experimental results also indicate that the recognition rate maximizes when the number of sample points is 200.
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Received: 06 April 2007
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2007, Vol. 20 
