As one method of preventing a traffic accident, an assist system for recognition of run environment, such as restriction information is researching and developing. We have proposed about the technique of extraction circular road signs from road color images for a former system of recognizing road signs and alarming to drivers. This technique is based on restriction of search area by using the specific colors, such as red, blue, yellow and white which are used for road signs, and extraction sign containing images by using its circular form. However, in order to recognize the classification of a sign using the result, the problem remained in the correctness of extraction. In this paper, an improved technique of extracting circular road signs is presented.
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