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Design of a Real-time Algorithm for the Recognition of Speed Limit Signs Using DCT Coefficients  

Kang, Byoung-Hwi (서강대학교 전자공학과 CAD & ES 연구실)
Cho, Han-Min (서강대학교 전자공학과 CAD & ES 연구실)
Kim, Jae-Young (한국전자통신연구원)
Hwang, Sun-Young (서강대학교 전자공학과 CAD & ES 연구실)
Kim, Kwang-Soo (서강대학교 서강미래기술연구원)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.35, no.12B, 2010 , pp. 1766-1774 More about this Journal
Abstract
This paper proposes a real-time algorithm of recognizing speed limit signs for intelligent vehicles. Contrary to previous works which use all the pixel values in the ROI (Region Of Interest) after preprocessing image at ROI and need a lot of operations, the proposed algorithm uses fewer DCT coefficients in the ROI as features of each image to reduce the number of operations. Choosing a portion of DCT coefficients which satisfy discriminant criteria for recognition, the proposed algorithm recognizes the speed limit signs using the information obtained in the selected features through LDA and MD. It selects one having the highest probability among the recognition results calculated by accumulating the classification results of consecutive individual frames. Experimental results show that the recognition rate for consecutive frames reaches to 100% with test images. When compared with the previous algorithm, the numbers of multiply and add operations are reduced by 58.6% and 38.3%, respectively.
Keywords
Intelligent Vehicle; TSR; Speed Limit Signs; DCT; LDA;
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Times Cited By KSCI : 1  (Citation Analysis)
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