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Design of a Real-time Algorithm Using Block-DCT for the Recognition of Speed Limit Signs
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 Title & Authors
Design of a Real-time Algorithm Using Block-DCT for the Recognition of Speed Limit Signs
Han, Seung-Wha; Cho, Han-Min; Kim, Kwang-Soo; Hwang, Sun-Young;
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This paper proposes a real-time algorithm for speed limit sign recognition for advanced safety vehicle system. The proposed algorithm uses Block-DCT in extracting features from a given ROI(Region Of Interest) instead of using entire pixel values as in previous works. The proposed algorithm chooses parts of the DCT coefficients according to the proposed discriminant factor, uses correlation coefficients and variances among ROIs from training samples to reduce amount of arithmetic operations without performance degradation in classification process. The algorithm recognizes the speed limit signs using the information obtained during training process by calculating LDA and Mahalanobis Distance. To increase the hit rate of recognition, it uses accumulated classification results computed for a sequence of frames. Experimental results show that the hit rate of recognition for sequential frames reaches up to 100 %. When compared with previous works, numbers of multiply and add operations are reduced by 69.3 % and 67.9 %, respectively. Start after striking space key 2 times.
ASV;TSR;Speed Limit Signs;Block-DCT;Intelligent Vehicle;
 Cited by
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