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  2008, Vol. 21 Issue (6): 824-830    DOI:
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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.
Key wordsProtuberant Character Recognition      Principal Component Analysis (PCA)      Feature Invariant     
Received: 05 November 2007     
ZTFLH: TP391.41  
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SONG Huai-Bo
LU Chang-Hou
LI Jian-Mei
LU Guo-Liang
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SONG Huai-Bo,LU Chang-Hou,LI Jian-Mei等. Rotate Invariant Vector Extraction of Pressed Protuberant Characters on Metal Label and PCA Based Recognition[J]. , 2008, 21(6): 824-830.
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