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| Rotate Invariant Vector Extraction of Pressed Protuberant Characters on Metal Label and PCA Based Recognition |
| SONG Huai-Bo, LU Chang-Hou, LI Jian-Mei, LU Guo-Liang |
| School of Mechanical Engineering, Shandong University, Jinan 250061 |
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Abstract A sample vector formation method is presented to decrease the effect of the rotated characters on recognition rate. Firstly, the invariant features are extracted, such as centroid and principal axis. Then, the coordinate transformation is carried out and the image is converted to the polar coordinate system. Finally, the pixels are re-arranged according to the rules. The recognition is carried out directly on the gray-level images by adopting the improved PCA subspace method. Experimental results show that the proposed method can decrease the number of sieving samples with a higher recognition rate, compared with the typical method.
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Received: 05 November 2007
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2008, Vol. 21 
